From 5c742834ea1e18af975e6d8b9cc2250001425335 Mon Sep 17 00:00:00 2001
From: Pierre-Olivier Mercier <nemunaire@nemunai.re>
Date: Wed, 28 Nov 2018 04:15:14 +0100
Subject: [PATCH] frontend: public part now validate through blake2b.js flags
 and MCQs

---
 frontend/static/index.html      |    1 +
 frontend/static/js/blake2b.js   | 2594 +++++++++++++++++++++++++++++++
 frontend/static/js/challenge.js |   44 +-
 frontend/static/views/defi.html |   21 +-
 libfic/team_my.go               |   52 +-
 5 files changed, 2675 insertions(+), 37 deletions(-)
 create mode 100644 frontend/static/js/blake2b.js

diff --git a/frontend/static/index.html b/frontend/static/index.html
index 2631876c..73a9ada0 100644
--- a/frontend/static/index.html
+++ b/frontend/static/index.html
@@ -138,5 +138,6 @@
     <script src="/js/i18n/angular-locale_fr-fr.js"></script>
     <script src="/js/challenge.js"></script>
     <script src="/js/common.js"></script>
+    <script src="/js/blake2b.js" defer></script>
   </body>
 </html>
diff --git a/frontend/static/js/blake2b.js b/frontend/static/js/blake2b.js
new file mode 100644
index 00000000..f741df36
--- /dev/null
+++ b/frontend/static/js/blake2b.js
@@ -0,0 +1,2594 @@
+(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+// Blake2B in pure Javascript
+// Adapted from the reference implementation in RFC7693
+// Ported to Javascript by DC - https://github.com/dcposch
+
+var util = require('./util')
+
+// 64-bit unsigned addition
+// Sets v[a,a+1] += v[b,b+1]
+// v should be a Uint32Array
+function ADD64AA (v, a, b) {
+  var o0 = v[a] + v[b]
+  var o1 = v[a + 1] + v[b + 1]
+  if (o0 >= 0x100000000) {
+    o1++
+  }
+  v[a] = o0
+  v[a + 1] = o1
+}
+
+// 64-bit unsigned addition
+// Sets v[a,a+1] += b
+// b0 is the low 32 bits of b, b1 represents the high 32 bits
+function ADD64AC (v, a, b0, b1) {
+  var o0 = v[a] + b0
+  if (b0 < 0) {
+    o0 += 0x100000000
+  }
+  var o1 = v[a + 1] + b1
+  if (o0 >= 0x100000000) {
+    o1++
+  }
+  v[a] = o0
+  v[a + 1] = o1
+}
+
+// Little-endian byte access
+function B2B_GET32 (arr, i) {
+  return (arr[i] ^
+  (arr[i + 1] << 8) ^
+  (arr[i + 2] << 16) ^
+  (arr[i + 3] << 24))
+}
+
+// G Mixing function
+// The ROTRs are inlined for speed
+function B2B_G (a, b, c, d, ix, iy) {
+  var x0 = m[ix]
+  var x1 = m[ix + 1]
+  var y0 = m[iy]
+  var y1 = m[iy + 1]
+
+  ADD64AA(v, a, b) // v[a,a+1] += v[b,b+1] ... in JS we must store a uint64 as two uint32s
+  ADD64AC(v, a, x0, x1) // v[a, a+1] += x ... x0 is the low 32 bits of x, x1 is the high 32 bits
+
+  // v[d,d+1] = (v[d,d+1] xor v[a,a+1]) rotated to the right by 32 bits
+  var xor0 = v[d] ^ v[a]
+  var xor1 = v[d + 1] ^ v[a + 1]
+  v[d] = xor1
+  v[d + 1] = xor0
+
+  ADD64AA(v, c, d)
+
+  // v[b,b+1] = (v[b,b+1] xor v[c,c+1]) rotated right by 24 bits
+  xor0 = v[b] ^ v[c]
+  xor1 = v[b + 1] ^ v[c + 1]
+  v[b] = (xor0 >>> 24) ^ (xor1 << 8)
+  v[b + 1] = (xor1 >>> 24) ^ (xor0 << 8)
+
+  ADD64AA(v, a, b)
+  ADD64AC(v, a, y0, y1)
+
+  // v[d,d+1] = (v[d,d+1] xor v[a,a+1]) rotated right by 16 bits
+  xor0 = v[d] ^ v[a]
+  xor1 = v[d + 1] ^ v[a + 1]
+  v[d] = (xor0 >>> 16) ^ (xor1 << 16)
+  v[d + 1] = (xor1 >>> 16) ^ (xor0 << 16)
+
+  ADD64AA(v, c, d)
+
+  // v[b,b+1] = (v[b,b+1] xor v[c,c+1]) rotated right by 63 bits
+  xor0 = v[b] ^ v[c]
+  xor1 = v[b + 1] ^ v[c + 1]
+  v[b] = (xor1 >>> 31) ^ (xor0 << 1)
+  v[b + 1] = (xor0 >>> 31) ^ (xor1 << 1)
+}
+
+// Initialization Vector
+var BLAKE2B_IV32 = new Uint32Array([
+  0xF3BCC908, 0x6A09E667, 0x84CAA73B, 0xBB67AE85,
+  0xFE94F82B, 0x3C6EF372, 0x5F1D36F1, 0xA54FF53A,
+  0xADE682D1, 0x510E527F, 0x2B3E6C1F, 0x9B05688C,
+  0xFB41BD6B, 0x1F83D9AB, 0x137E2179, 0x5BE0CD19
+])
+
+var SIGMA8 = [
+  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+  14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3,
+  11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4,
+  7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8,
+  9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13,
+  2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9,
+  12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11,
+  13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10,
+  6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5,
+  10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0,
+  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+  14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3
+]
+
+// These are offsets into a uint64 buffer.
+// Multiply them all by 2 to make them offsets into a uint32 buffer,
+// because this is Javascript and we don't have uint64s
+var SIGMA82 = new Uint8Array(SIGMA8.map(function (x) { return x * 2 }))
+
+// Compression function. 'last' flag indicates last block.
+// Note we're representing 16 uint64s as 32 uint32s
+var v = new Uint32Array(32)
+var m = new Uint32Array(32)
+function blake2bCompress (ctx, last) {
+  var i = 0
+
+  // init work variables
+  for (i = 0; i < 16; i++) {
+    v[i] = ctx.h[i]
+    v[i + 16] = BLAKE2B_IV32[i]
+  }
+
+  // low 64 bits of offset
+  v[24] = v[24] ^ ctx.t
+  v[25] = v[25] ^ (ctx.t / 0x100000000)
+  // high 64 bits not supported, offset may not be higher than 2**53-1
+
+  // last block flag set ?
+  if (last) {
+    v[28] = ~v[28]
+    v[29] = ~v[29]
+  }
+
+  // get little-endian words
+  for (i = 0; i < 32; i++) {
+    m[i] = B2B_GET32(ctx.b, 4 * i)
+  }
+
+  // twelve rounds of mixing
+  // uncomment the DebugPrint calls to log the computation
+  // and match the RFC sample documentation
+  // util.debugPrint('          m[16]', m, 64)
+  for (i = 0; i < 12; i++) {
+    // util.debugPrint('   (i=' + (i < 10 ? ' ' : '') + i + ') v[16]', v, 64)
+    B2B_G(0, 8, 16, 24, SIGMA82[i * 16 + 0], SIGMA82[i * 16 + 1])
+    B2B_G(2, 10, 18, 26, SIGMA82[i * 16 + 2], SIGMA82[i * 16 + 3])
+    B2B_G(4, 12, 20, 28, SIGMA82[i * 16 + 4], SIGMA82[i * 16 + 5])
+    B2B_G(6, 14, 22, 30, SIGMA82[i * 16 + 6], SIGMA82[i * 16 + 7])
+    B2B_G(0, 10, 20, 30, SIGMA82[i * 16 + 8], SIGMA82[i * 16 + 9])
+    B2B_G(2, 12, 22, 24, SIGMA82[i * 16 + 10], SIGMA82[i * 16 + 11])
+    B2B_G(4, 14, 16, 26, SIGMA82[i * 16 + 12], SIGMA82[i * 16 + 13])
+    B2B_G(6, 8, 18, 28, SIGMA82[i * 16 + 14], SIGMA82[i * 16 + 15])
+  }
+  // util.debugPrint('   (i=12) v[16]', v, 64)
+
+  for (i = 0; i < 16; i++) {
+    ctx.h[i] = ctx.h[i] ^ v[i] ^ v[i + 16]
+  }
+  // util.debugPrint('h[8]', ctx.h, 64)
+}
+
+// Creates a BLAKE2b hashing context
+// Requires an output length between 1 and 64 bytes
+// Takes an optional Uint8Array key
+function blake2bInit (outlen, key) {
+  if (outlen === 0 || outlen > 64) {
+    throw new Error('Illegal output length, expected 0 < length <= 64')
+  }
+  if (key && key.length > 64) {
+    throw new Error('Illegal key, expected Uint8Array with 0 < length <= 64')
+  }
+
+  // state, 'param block'
+  var ctx = {
+    b: new Uint8Array(128),
+    h: new Uint32Array(16),
+    t: 0, // input count
+    c: 0, // pointer within buffer
+    outlen: outlen // output length in bytes
+  }
+
+  // initialize hash state
+  for (var i = 0; i < 16; i++) {
+    ctx.h[i] = BLAKE2B_IV32[i]
+  }
+  var keylen = key ? key.length : 0
+  ctx.h[0] ^= 0x01010000 ^ (keylen << 8) ^ outlen
+
+  // key the hash, if applicable
+  if (key) {
+    blake2bUpdate(ctx, key)
+    // at the end
+    ctx.c = 128
+  }
+
+  return ctx
+}
+
+// Updates a BLAKE2b streaming hash
+// Requires hash context and Uint8Array (byte array)
+function blake2bUpdate (ctx, input) {
+  for (var i = 0; i < input.length; i++) {
+    if (ctx.c === 128) { // buffer full ?
+      ctx.t += ctx.c // add counters
+      blake2bCompress(ctx, false) // compress (not last)
+      ctx.c = 0 // counter to zero
+    }
+    ctx.b[ctx.c++] = input[i]
+  }
+}
+
+// Completes a BLAKE2b streaming hash
+// Returns a Uint8Array containing the message digest
+function blake2bFinal (ctx) {
+  ctx.t += ctx.c // mark last block offset
+
+  while (ctx.c < 128) { // fill up with zeros
+    ctx.b[ctx.c++] = 0
+  }
+  blake2bCompress(ctx, true) // final block flag = 1
+
+  // little endian convert and store
+  var out = new Uint8Array(ctx.outlen)
+  for (var i = 0; i < ctx.outlen; i++) {
+    out[i] = ctx.h[i >> 2] >> (8 * (i & 3))
+  }
+  return out
+}
+
+// Computes the BLAKE2B hash of a string or byte array, and returns a Uint8Array
+//
+// Returns a n-byte Uint8Array
+//
+// Parameters:
+// - input - the input bytes, as a string, Buffer or Uint8Array
+// - key - optional key Uint8Array, up to 64 bytes
+// - outlen - optional output length in bytes, default 64
+function blake2b (input, key, outlen) {
+  // preprocess inputs
+  outlen = outlen || 64
+  input = util.normalizeInput(input)
+
+  // do the math
+  var ctx = blake2bInit(outlen, key)
+  blake2bUpdate(ctx, input)
+  return blake2bFinal(ctx)
+}
+
+// Computes the BLAKE2B hash of a string or byte array
+//
+// Returns an n-byte hash in hex, all lowercase
+//
+// Parameters:
+// - input - the input bytes, as a string, Buffer, or Uint8Array
+// - key - optional key Uint8Array, up to 64 bytes
+// - outlen - optional output length in bytes, default 64
+function blake2bHex (input, key, outlen) {
+  var output = blake2b(input, key, outlen)
+  return util.toHex(output)
+}
+
+module.exports = {
+  blake2b: blake2b,
+  blake2bHex: blake2bHex,
+  blake2bInit: blake2bInit,
+  blake2bUpdate: blake2bUpdate,
+  blake2bFinal: blake2bFinal
+}
+
+},{"./util":5}],2:[function(require,module,exports){
+// BLAKE2s hash function in pure Javascript
+// Adapted from the reference implementation in RFC7693
+// Ported to Javascript by DC - https://github.com/dcposch
+
+var util = require('./util')
+
+// Little-endian byte access.
+// Expects a Uint8Array and an index
+// Returns the little-endian uint32 at v[i..i+3]
+function B2S_GET32 (v, i) {
+  return v[i] ^ (v[i + 1] << 8) ^ (v[i + 2] << 16) ^ (v[i + 3] << 24)
+}
+
+// Mixing function G.
+function B2S_G (a, b, c, d, x, y) {
+  v[a] = v[a] + v[b] + x
+  v[d] = ROTR32(v[d] ^ v[a], 16)
+  v[c] = v[c] + v[d]
+  v[b] = ROTR32(v[b] ^ v[c], 12)
+  v[a] = v[a] + v[b] + y
+  v[d] = ROTR32(v[d] ^ v[a], 8)
+  v[c] = v[c] + v[d]
+  v[b] = ROTR32(v[b] ^ v[c], 7)
+}
+
+// 32-bit right rotation
+// x should be a uint32
+// y must be between 1 and 31, inclusive
+function ROTR32 (x, y) {
+  return (x >>> y) ^ (x << (32 - y))
+}
+
+// Initialization Vector.
+var BLAKE2S_IV = new Uint32Array([
+  0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
+  0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19])
+
+var SIGMA = new Uint8Array([
+  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+  14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3,
+  11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4,
+  7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8,
+  9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13,
+  2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9,
+  12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11,
+  13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10,
+  6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5,
+  10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0])
+
+// Compression function. "last" flag indicates last block
+var v = new Uint32Array(16)
+var m = new Uint32Array(16)
+function blake2sCompress (ctx, last) {
+  var i = 0
+  for (i = 0; i < 8; i++) { // init work variables
+    v[i] = ctx.h[i]
+    v[i + 8] = BLAKE2S_IV[i]
+  }
+
+  v[12] ^= ctx.t // low 32 bits of offset
+  v[13] ^= (ctx.t / 0x100000000) // high 32 bits
+  if (last) { // last block flag set ?
+    v[14] = ~v[14]
+  }
+
+  for (i = 0; i < 16; i++) { // get little-endian words
+    m[i] = B2S_GET32(ctx.b, 4 * i)
+  }
+
+  // ten rounds of mixing
+  // uncomment the DebugPrint calls to log the computation
+  // and match the RFC sample documentation
+  // util.debugPrint('          m[16]', m, 32)
+  for (i = 0; i < 10; i++) {
+    // util.debugPrint('   (i=' + i + ')  v[16]', v, 32)
+    B2S_G(0, 4, 8, 12, m[SIGMA[i * 16 + 0]], m[SIGMA[i * 16 + 1]])
+    B2S_G(1, 5, 9, 13, m[SIGMA[i * 16 + 2]], m[SIGMA[i * 16 + 3]])
+    B2S_G(2, 6, 10, 14, m[SIGMA[i * 16 + 4]], m[SIGMA[i * 16 + 5]])
+    B2S_G(3, 7, 11, 15, m[SIGMA[i * 16 + 6]], m[SIGMA[i * 16 + 7]])
+    B2S_G(0, 5, 10, 15, m[SIGMA[i * 16 + 8]], m[SIGMA[i * 16 + 9]])
+    B2S_G(1, 6, 11, 12, m[SIGMA[i * 16 + 10]], m[SIGMA[i * 16 + 11]])
+    B2S_G(2, 7, 8, 13, m[SIGMA[i * 16 + 12]], m[SIGMA[i * 16 + 13]])
+    B2S_G(3, 4, 9, 14, m[SIGMA[i * 16 + 14]], m[SIGMA[i * 16 + 15]])
+  }
+  // util.debugPrint('   (i=10) v[16]', v, 32)
+
+  for (i = 0; i < 8; i++) {
+    ctx.h[i] ^= v[i] ^ v[i + 8]
+  }
+  // util.debugPrint('h[8]', ctx.h, 32)
+}
+
+// Creates a BLAKE2s hashing context
+// Requires an output length between 1 and 32 bytes
+// Takes an optional Uint8Array key
+function blake2sInit (outlen, key) {
+  if (!(outlen > 0 && outlen <= 32)) {
+    throw new Error('Incorrect output length, should be in [1, 32]')
+  }
+  var keylen = key ? key.length : 0
+  if (key && !(keylen > 0 && keylen <= 32)) {
+    throw new Error('Incorrect key length, should be in [1, 32]')
+  }
+
+  var ctx = {
+    h: new Uint32Array(BLAKE2S_IV), // hash state
+    b: new Uint32Array(64), // input block
+    c: 0, // pointer within block
+    t: 0, // input count
+    outlen: outlen // output length in bytes
+  }
+  ctx.h[0] ^= 0x01010000 ^ (keylen << 8) ^ outlen
+
+  if (keylen > 0) {
+    blake2sUpdate(ctx, key)
+    ctx.c = 64 // at the end
+  }
+
+  return ctx
+}
+
+// Updates a BLAKE2s streaming hash
+// Requires hash context and Uint8Array (byte array)
+function blake2sUpdate (ctx, input) {
+  for (var i = 0; i < input.length; i++) {
+    if (ctx.c === 64) { // buffer full ?
+      ctx.t += ctx.c // add counters
+      blake2sCompress(ctx, false) // compress (not last)
+      ctx.c = 0 // counter to zero
+    }
+    ctx.b[ctx.c++] = input[i]
+  }
+}
+
+// Completes a BLAKE2s streaming hash
+// Returns a Uint8Array containing the message digest
+function blake2sFinal (ctx) {
+  ctx.t += ctx.c // mark last block offset
+  while (ctx.c < 64) { // fill up with zeros
+    ctx.b[ctx.c++] = 0
+  }
+  blake2sCompress(ctx, true) // final block flag = 1
+
+  // little endian convert and store
+  var out = new Uint8Array(ctx.outlen)
+  for (var i = 0; i < ctx.outlen; i++) {
+    out[i] = (ctx.h[i >> 2] >> (8 * (i & 3))) & 0xFF
+  }
+  return out
+}
+
+// Computes the BLAKE2S hash of a string or byte array, and returns a Uint8Array
+//
+// Returns a n-byte Uint8Array
+//
+// Parameters:
+// - input - the input bytes, as a string, Buffer, or Uint8Array
+// - key - optional key Uint8Array, up to 32 bytes
+// - outlen - optional output length in bytes, default 64
+function blake2s (input, key, outlen) {
+  // preprocess inputs
+  outlen = outlen || 32
+  input = util.normalizeInput(input)
+
+  // do the math
+  var ctx = blake2sInit(outlen, key)
+  blake2sUpdate(ctx, input)
+  return blake2sFinal(ctx)
+}
+
+// Computes the BLAKE2S hash of a string or byte array
+//
+// Returns an n-byte hash in hex, all lowercase
+//
+// Parameters:
+// - input - the input bytes, as a string, Buffer, or Uint8Array
+// - key - optional key Uint8Array, up to 32 bytes
+// - outlen - optional output length in bytes, default 64
+function blake2sHex (input, key, outlen) {
+  var output = blake2s(input, key, outlen)
+  return util.toHex(output)
+}
+
+module.exports = {
+  blake2s: blake2s,
+  blake2sHex: blake2sHex,
+  blake2sInit: blake2sInit,
+  blake2sUpdate: blake2sUpdate,
+  blake2sFinal: blake2sFinal
+}
+
+},{"./util":5}],3:[function(require,module,exports){
+var b2b = require('./blake2b')
+var b2s = require('./blake2s')
+
+module.exports = {
+  blake2b: b2b.blake2b,
+  blake2bHex: b2b.blake2bHex,
+  blake2bInit: b2b.blake2bInit,
+  blake2bUpdate: b2b.blake2bUpdate,
+  blake2bFinal: b2b.blake2bFinal,
+  blake2s: b2s.blake2s,
+  blake2sHex: b2s.blake2sHex,
+  blake2sInit: b2s.blake2sInit,
+  blake2sUpdate: b2s.blake2sUpdate,
+  blake2sFinal: b2s.blake2sFinal
+}
+
+},{"./blake2b":1,"./blake2s":2}],4:[function(require,module,exports){
+var blake = require('.')
+window.b2sum = function(s) {
+    return blake.blake2bHex(s);
+}
+
+},{".":3}],5:[function(require,module,exports){
+(function (Buffer){
+var ERROR_MSG_INPUT = 'Input must be an string, Buffer or Uint8Array'
+
+// For convenience, let people hash a string, not just a Uint8Array
+function normalizeInput (input) {
+  var ret
+  if (input instanceof Uint8Array) {
+    ret = input
+  } else if (input instanceof Buffer) {
+    ret = new Uint8Array(input)
+  } else if (typeof (input) === 'string') {
+    ret = new Uint8Array(Buffer.from(input, 'utf8'))
+  } else {
+    throw new Error(ERROR_MSG_INPUT)
+  }
+  return ret
+}
+
+// Converts a Uint8Array to a hexadecimal string
+// For example, toHex([255, 0, 255]) returns "ff00ff"
+function toHex (bytes) {
+  return Array.prototype.map.call(bytes, function (n) {
+    return (n < 16 ? '0' : '') + n.toString(16)
+  }).join('')
+}
+
+// Converts any value in [0...2^32-1] to an 8-character hex string
+function uint32ToHex (val) {
+  return (0x100000000 + val).toString(16).substring(1)
+}
+
+// For debugging: prints out hash state in the same format as the RFC
+// sample computation exactly, so that you can diff
+function debugPrint (label, arr, size) {
+  var msg = '\n' + label + ' = '
+  for (var i = 0; i < arr.length; i += 2) {
+    if (size === 32) {
+      msg += uint32ToHex(arr[i]).toUpperCase()
+      msg += ' '
+      msg += uint32ToHex(arr[i + 1]).toUpperCase()
+    } else if (size === 64) {
+      msg += uint32ToHex(arr[i + 1]).toUpperCase()
+      msg += uint32ToHex(arr[i]).toUpperCase()
+    } else throw new Error('Invalid size ' + size)
+    if (i % 6 === 4) {
+      msg += '\n' + new Array(label.length + 4).join(' ')
+    } else if (i < arr.length - 2) {
+      msg += ' '
+    }
+  }
+  console.log(msg)
+}
+
+// For performance testing: generates N bytes of input, hashes M times
+// Measures and prints MB/second hash performance each time
+function testSpeed (hashFn, N, M) {
+  var startMs = new Date().getTime()
+
+  var input = new Uint8Array(N)
+  for (var i = 0; i < N; i++) {
+    input[i] = i % 256
+  }
+  var genMs = new Date().getTime()
+  console.log('Generated random input in ' + (genMs - startMs) + 'ms')
+  startMs = genMs
+
+  for (i = 0; i < M; i++) {
+    var hashHex = hashFn(input)
+    var hashMs = new Date().getTime()
+    var ms = hashMs - startMs
+    startMs = hashMs
+    console.log('Hashed in ' + ms + 'ms: ' + hashHex.substring(0, 20) + '...')
+    console.log(Math.round(N / (1 << 20) / (ms / 1000) * 100) / 100 + ' MB PER SECOND')
+  }
+}
+
+module.exports = {
+  normalizeInput: normalizeInput,
+  toHex: toHex,
+  debugPrint: debugPrint,
+  testSpeed: testSpeed
+}
+
+}).call(this,require("buffer").Buffer)
+},{"buffer":7}],6:[function(require,module,exports){
+'use strict'
+
+exports.byteLength = byteLength
+exports.toByteArray = toByteArray
+exports.fromByteArray = fromByteArray
+
+var lookup = []
+var revLookup = []
+var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
+
+var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+for (var i = 0, len = code.length; i < len; ++i) {
+  lookup[i] = code[i]
+  revLookup[code.charCodeAt(i)] = i
+}
+
+// Support decoding URL-safe base64 strings, as Node.js does.
+// See: https://en.wikipedia.org/wiki/Base64#URL_applications
+revLookup['-'.charCodeAt(0)] = 62
+revLookup['_'.charCodeAt(0)] = 63
+
+function getLens (b64) {
+  var len = b64.length
+
+  if (len % 4 > 0) {
+    throw new Error('Invalid string. Length must be a multiple of 4')
+  }
+
+  // Trim off extra bytes after placeholder bytes are found
+  // See: https://github.com/beatgammit/base64-js/issues/42
+  var validLen = b64.indexOf('=')
+  if (validLen === -1) validLen = len
+
+  var placeHoldersLen = validLen === len
+    ? 0
+    : 4 - (validLen % 4)
+
+  return [validLen, placeHoldersLen]
+}
+
+// base64 is 4/3 + up to two characters of the original data
+function byteLength (b64) {
+  var lens = getLens(b64)
+  var validLen = lens[0]
+  var placeHoldersLen = lens[1]
+  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
+}
+
+function _byteLength (b64, validLen, placeHoldersLen) {
+  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
+}
+
+function toByteArray (b64) {
+  var tmp
+  var lens = getLens(b64)
+  var validLen = lens[0]
+  var placeHoldersLen = lens[1]
+
+  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
+
+  var curByte = 0
+
+  // if there are placeholders, only get up to the last complete 4 chars
+  var len = placeHoldersLen > 0
+    ? validLen - 4
+    : validLen
+
+  for (var i = 0; i < len; i += 4) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 18) |
+      (revLookup[b64.charCodeAt(i + 1)] << 12) |
+      (revLookup[b64.charCodeAt(i + 2)] << 6) |
+      revLookup[b64.charCodeAt(i + 3)]
+    arr[curByte++] = (tmp >> 16) & 0xFF
+    arr[curByte++] = (tmp >> 8) & 0xFF
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  if (placeHoldersLen === 2) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 2) |
+      (revLookup[b64.charCodeAt(i + 1)] >> 4)
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  if (placeHoldersLen === 1) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 10) |
+      (revLookup[b64.charCodeAt(i + 1)] << 4) |
+      (revLookup[b64.charCodeAt(i + 2)] >> 2)
+    arr[curByte++] = (tmp >> 8) & 0xFF
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  return arr
+}
+
+function tripletToBase64 (num) {
+  return lookup[num >> 18 & 0x3F] +
+    lookup[num >> 12 & 0x3F] +
+    lookup[num >> 6 & 0x3F] +
+    lookup[num & 0x3F]
+}
+
+function encodeChunk (uint8, start, end) {
+  var tmp
+  var output = []
+  for (var i = start; i < end; i += 3) {
+    tmp =
+      ((uint8[i] << 16) & 0xFF0000) +
+      ((uint8[i + 1] << 8) & 0xFF00) +
+      (uint8[i + 2] & 0xFF)
+    output.push(tripletToBase64(tmp))
+  }
+  return output.join('')
+}
+
+function fromByteArray (uint8) {
+  var tmp
+  var len = uint8.length
+  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
+  var parts = []
+  var maxChunkLength = 16383 // must be multiple of 3
+
+  // go through the array every three bytes, we'll deal with trailing stuff later
+  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+    parts.push(encodeChunk(
+      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)
+    ))
+  }
+
+  // pad the end with zeros, but make sure to not forget the extra bytes
+  if (extraBytes === 1) {
+    tmp = uint8[len - 1]
+    parts.push(
+      lookup[tmp >> 2] +
+      lookup[(tmp << 4) & 0x3F] +
+      '=='
+    )
+  } else if (extraBytes === 2) {
+    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
+    parts.push(
+      lookup[tmp >> 10] +
+      lookup[(tmp >> 4) & 0x3F] +
+      lookup[(tmp << 2) & 0x3F] +
+      '='
+    )
+  }
+
+  return parts.join('')
+}
+
+},{}],7:[function(require,module,exports){
+/*!
+ * The buffer module from node.js, for the browser.
+ *
+ * @author   Feross Aboukhadijeh <https://feross.org>
+ * @license  MIT
+ */
+/* eslint-disable no-proto */
+
+'use strict'
+
+var base64 = require('base64-js')
+var ieee754 = require('ieee754')
+
+exports.Buffer = Buffer
+exports.SlowBuffer = SlowBuffer
+exports.INSPECT_MAX_BYTES = 50
+
+var K_MAX_LENGTH = 0x7fffffff
+exports.kMaxLength = K_MAX_LENGTH
+
+/**
+ * If `Buffer.TYPED_ARRAY_SUPPORT`:
+ *   === true    Use Uint8Array implementation (fastest)
+ *   === false   Print warning and recommend using `buffer` v4.x which has an Object
+ *               implementation (most compatible, even IE6)
+ *
+ * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
+ * Opera 11.6+, iOS 4.2+.
+ *
+ * We report that the browser does not support typed arrays if the are not subclassable
+ * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
+ * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
+ * for __proto__ and has a buggy typed array implementation.
+ */
+Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
+
+if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
+    typeof console.error === 'function') {
+  console.error(
+    'This browser lacks typed array (Uint8Array) support which is required by ' +
+    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
+  )
+}
+
+function typedArraySupport () {
+  // Can typed array instances can be augmented?
+  try {
+    var arr = new Uint8Array(1)
+    arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
+    return arr.foo() === 42
+  } catch (e) {
+    return false
+  }
+}
+
+Object.defineProperty(Buffer.prototype, 'parent', {
+  enumerable: true,
+  get: function () {
+    if (!Buffer.isBuffer(this)) return undefined
+    return this.buffer
+  }
+})
+
+Object.defineProperty(Buffer.prototype, 'offset', {
+  enumerable: true,
+  get: function () {
+    if (!Buffer.isBuffer(this)) return undefined
+    return this.byteOffset
+  }
+})
+
+function createBuffer (length) {
+  if (length > K_MAX_LENGTH) {
+    throw new RangeError('The value "' + length + '" is invalid for option "size"')
+  }
+  // Return an augmented `Uint8Array` instance
+  var buf = new Uint8Array(length)
+  buf.__proto__ = Buffer.prototype
+  return buf
+}
+
+/**
+ * The Buffer constructor returns instances of `Uint8Array` that have their
+ * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
+ * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
+ * and the `Uint8Array` methods. Square bracket notation works as expected -- it
+ * returns a single octet.
+ *
+ * The `Uint8Array` prototype remains unmodified.
+ */
+
+function Buffer (arg, encodingOrOffset, length) {
+  // Common case.
+  if (typeof arg === 'number') {
+    if (typeof encodingOrOffset === 'string') {
+      throw new TypeError(
+        'The "string" argument must be of type string. Received type number'
+      )
+    }
+    return allocUnsafe(arg)
+  }
+  return from(arg, encodingOrOffset, length)
+}
+
+// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
+if (typeof Symbol !== 'undefined' && Symbol.species != null &&
+    Buffer[Symbol.species] === Buffer) {
+  Object.defineProperty(Buffer, Symbol.species, {
+    value: null,
+    configurable: true,
+    enumerable: false,
+    writable: false
+  })
+}
+
+Buffer.poolSize = 8192 // not used by this implementation
+
+function from (value, encodingOrOffset, length) {
+  if (typeof value === 'string') {
+    return fromString(value, encodingOrOffset)
+  }
+
+  if (ArrayBuffer.isView(value)) {
+    return fromArrayLike(value)
+  }
+
+  if (value == null) {
+    throw TypeError(
+      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
+      'or Array-like Object. Received type ' + (typeof value)
+    )
+  }
+
+  if (isInstance(value, ArrayBuffer) ||
+      (value && isInstance(value.buffer, ArrayBuffer))) {
+    return fromArrayBuffer(value, encodingOrOffset, length)
+  }
+
+  if (typeof value === 'number') {
+    throw new TypeError(
+      'The "value" argument must not be of type number. Received type number'
+    )
+  }
+
+  var valueOf = value.valueOf && value.valueOf()
+  if (valueOf != null && valueOf !== value) {
+    return Buffer.from(valueOf, encodingOrOffset, length)
+  }
+
+  var b = fromObject(value)
+  if (b) return b
+
+  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
+      typeof value[Symbol.toPrimitive] === 'function') {
+    return Buffer.from(
+      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
+    )
+  }
+
+  throw new TypeError(
+    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
+    'or Array-like Object. Received type ' + (typeof value)
+  )
+}
+
+/**
+ * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
+ * if value is a number.
+ * Buffer.from(str[, encoding])
+ * Buffer.from(array)
+ * Buffer.from(buffer)
+ * Buffer.from(arrayBuffer[, byteOffset[, length]])
+ **/
+Buffer.from = function (value, encodingOrOffset, length) {
+  return from(value, encodingOrOffset, length)
+}
+
+// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
+// https://github.com/feross/buffer/pull/148
+Buffer.prototype.__proto__ = Uint8Array.prototype
+Buffer.__proto__ = Uint8Array
+
+function assertSize (size) {
+  if (typeof size !== 'number') {
+    throw new TypeError('"size" argument must be of type number')
+  } else if (size < 0) {
+    throw new RangeError('The value "' + size + '" is invalid for option "size"')
+  }
+}
+
+function alloc (size, fill, encoding) {
+  assertSize(size)
+  if (size <= 0) {
+    return createBuffer(size)
+  }
+  if (fill !== undefined) {
+    // Only pay attention to encoding if it's a string. This
+    // prevents accidentally sending in a number that would
+    // be interpretted as a start offset.
+    return typeof encoding === 'string'
+      ? createBuffer(size).fill(fill, encoding)
+      : createBuffer(size).fill(fill)
+  }
+  return createBuffer(size)
+}
+
+/**
+ * Creates a new filled Buffer instance.
+ * alloc(size[, fill[, encoding]])
+ **/
+Buffer.alloc = function (size, fill, encoding) {
+  return alloc(size, fill, encoding)
+}
+
+function allocUnsafe (size) {
+  assertSize(size)
+  return createBuffer(size < 0 ? 0 : checked(size) | 0)
+}
+
+/**
+ * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
+ * */
+Buffer.allocUnsafe = function (size) {
+  return allocUnsafe(size)
+}
+/**
+ * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
+ */
+Buffer.allocUnsafeSlow = function (size) {
+  return allocUnsafe(size)
+}
+
+function fromString (string, encoding) {
+  if (typeof encoding !== 'string' || encoding === '') {
+    encoding = 'utf8'
+  }
+
+  if (!Buffer.isEncoding(encoding)) {
+    throw new TypeError('Unknown encoding: ' + encoding)
+  }
+
+  var length = byteLength(string, encoding) | 0
+  var buf = createBuffer(length)
+
+  var actual = buf.write(string, encoding)
+
+  if (actual !== length) {
+    // Writing a hex string, for example, that contains invalid characters will
+    // cause everything after the first invalid character to be ignored. (e.g.
+    // 'abxxcd' will be treated as 'ab')
+    buf = buf.slice(0, actual)
+  }
+
+  return buf
+}
+
+function fromArrayLike (array) {
+  var length = array.length < 0 ? 0 : checked(array.length) | 0
+  var buf = createBuffer(length)
+  for (var i = 0; i < length; i += 1) {
+    buf[i] = array[i] & 255
+  }
+  return buf
+}
+
+function fromArrayBuffer (array, byteOffset, length) {
+  if (byteOffset < 0 || array.byteLength < byteOffset) {
+    throw new RangeError('"offset" is outside of buffer bounds')
+  }
+
+  if (array.byteLength < byteOffset + (length || 0)) {
+    throw new RangeError('"length" is outside of buffer bounds')
+  }
+
+  var buf
+  if (byteOffset === undefined && length === undefined) {
+    buf = new Uint8Array(array)
+  } else if (length === undefined) {
+    buf = new Uint8Array(array, byteOffset)
+  } else {
+    buf = new Uint8Array(array, byteOffset, length)
+  }
+
+  // Return an augmented `Uint8Array` instance
+  buf.__proto__ = Buffer.prototype
+  return buf
+}
+
+function fromObject (obj) {
+  if (Buffer.isBuffer(obj)) {
+    var len = checked(obj.length) | 0
+    var buf = createBuffer(len)
+
+    if (buf.length === 0) {
+      return buf
+    }
+
+    obj.copy(buf, 0, 0, len)
+    return buf
+  }
+
+  if (obj.length !== undefined) {
+    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
+      return createBuffer(0)
+    }
+    return fromArrayLike(obj)
+  }
+
+  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
+    return fromArrayLike(obj.data)
+  }
+}
+
+function checked (length) {
+  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
+  // length is NaN (which is otherwise coerced to zero.)
+  if (length >= K_MAX_LENGTH) {
+    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
+                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
+  }
+  return length | 0
+}
+
+function SlowBuffer (length) {
+  if (+length != length) { // eslint-disable-line eqeqeq
+    length = 0
+  }
+  return Buffer.alloc(+length)
+}
+
+Buffer.isBuffer = function isBuffer (b) {
+  return b != null && b._isBuffer === true &&
+    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
+}
+
+Buffer.compare = function compare (a, b) {
+  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
+  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
+  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
+    throw new TypeError(
+      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
+    )
+  }
+
+  if (a === b) return 0
+
+  var x = a.length
+  var y = b.length
+
+  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
+    if (a[i] !== b[i]) {
+      x = a[i]
+      y = b[i]
+      break
+    }
+  }
+
+  if (x < y) return -1
+  if (y < x) return 1
+  return 0
+}
+
+Buffer.isEncoding = function isEncoding (encoding) {
+  switch (String(encoding).toLowerCase()) {
+    case 'hex':
+    case 'utf8':
+    case 'utf-8':
+    case 'ascii':
+    case 'latin1':
+    case 'binary':
+    case 'base64':
+    case 'ucs2':
+    case 'ucs-2':
+    case 'utf16le':
+    case 'utf-16le':
+      return true
+    default:
+      return false
+  }
+}
+
+Buffer.concat = function concat (list, length) {
+  if (!Array.isArray(list)) {
+    throw new TypeError('"list" argument must be an Array of Buffers')
+  }
+
+  if (list.length === 0) {
+    return Buffer.alloc(0)
+  }
+
+  var i
+  if (length === undefined) {
+    length = 0
+    for (i = 0; i < list.length; ++i) {
+      length += list[i].length
+    }
+  }
+
+  var buffer = Buffer.allocUnsafe(length)
+  var pos = 0
+  for (i = 0; i < list.length; ++i) {
+    var buf = list[i]
+    if (isInstance(buf, Uint8Array)) {
+      buf = Buffer.from(buf)
+    }
+    if (!Buffer.isBuffer(buf)) {
+      throw new TypeError('"list" argument must be an Array of Buffers')
+    }
+    buf.copy(buffer, pos)
+    pos += buf.length
+  }
+  return buffer
+}
+
+function byteLength (string, encoding) {
+  if (Buffer.isBuffer(string)) {
+    return string.length
+  }
+  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
+    return string.byteLength
+  }
+  if (typeof string !== 'string') {
+    throw new TypeError(
+      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
+      'Received type ' + typeof string
+    )
+  }
+
+  var len = string.length
+  var mustMatch = (arguments.length > 2 && arguments[2] === true)
+  if (!mustMatch && len === 0) return 0
+
+  // Use a for loop to avoid recursion
+  var loweredCase = false
+  for (;;) {
+    switch (encoding) {
+      case 'ascii':
+      case 'latin1':
+      case 'binary':
+        return len
+      case 'utf8':
+      case 'utf-8':
+        return utf8ToBytes(string).length
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return len * 2
+      case 'hex':
+        return len >>> 1
+      case 'base64':
+        return base64ToBytes(string).length
+      default:
+        if (loweredCase) {
+          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
+        }
+        encoding = ('' + encoding).toLowerCase()
+        loweredCase = true
+    }
+  }
+}
+Buffer.byteLength = byteLength
+
+function slowToString (encoding, start, end) {
+  var loweredCase = false
+
+  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
+  // property of a typed array.
+
+  // This behaves neither like String nor Uint8Array in that we set start/end
+  // to their upper/lower bounds if the value passed is out of range.
+  // undefined is handled specially as per ECMA-262 6th Edition,
+  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
+  if (start === undefined || start < 0) {
+    start = 0
+  }
+  // Return early if start > this.length. Done here to prevent potential uint32
+  // coercion fail below.
+  if (start > this.length) {
+    return ''
+  }
+
+  if (end === undefined || end > this.length) {
+    end = this.length
+  }
+
+  if (end <= 0) {
+    return ''
+  }
+
+  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
+  end >>>= 0
+  start >>>= 0
+
+  if (end <= start) {
+    return ''
+  }
+
+  if (!encoding) encoding = 'utf8'
+
+  while (true) {
+    switch (encoding) {
+      case 'hex':
+        return hexSlice(this, start, end)
+
+      case 'utf8':
+      case 'utf-8':
+        return utf8Slice(this, start, end)
+
+      case 'ascii':
+        return asciiSlice(this, start, end)
+
+      case 'latin1':
+      case 'binary':
+        return latin1Slice(this, start, end)
+
+      case 'base64':
+        return base64Slice(this, start, end)
+
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return utf16leSlice(this, start, end)
+
+      default:
+        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
+        encoding = (encoding + '').toLowerCase()
+        loweredCase = true
+    }
+  }
+}
+
+// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
+// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
+// reliably in a browserify context because there could be multiple different
+// copies of the 'buffer' package in use. This method works even for Buffer
+// instances that were created from another copy of the `buffer` package.
+// See: https://github.com/feross/buffer/issues/154
+Buffer.prototype._isBuffer = true
+
+function swap (b, n, m) {
+  var i = b[n]
+  b[n] = b[m]
+  b[m] = i
+}
+
+Buffer.prototype.swap16 = function swap16 () {
+  var len = this.length
+  if (len % 2 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 16-bits')
+  }
+  for (var i = 0; i < len; i += 2) {
+    swap(this, i, i + 1)
+  }
+  return this
+}
+
+Buffer.prototype.swap32 = function swap32 () {
+  var len = this.length
+  if (len % 4 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 32-bits')
+  }
+  for (var i = 0; i < len; i += 4) {
+    swap(this, i, i + 3)
+    swap(this, i + 1, i + 2)
+  }
+  return this
+}
+
+Buffer.prototype.swap64 = function swap64 () {
+  var len = this.length
+  if (len % 8 !== 0) {
+    throw new RangeError('Buffer size must be a multiple of 64-bits')
+  }
+  for (var i = 0; i < len; i += 8) {
+    swap(this, i, i + 7)
+    swap(this, i + 1, i + 6)
+    swap(this, i + 2, i + 5)
+    swap(this, i + 3, i + 4)
+  }
+  return this
+}
+
+Buffer.prototype.toString = function toString () {
+  var length = this.length
+  if (length === 0) return ''
+  if (arguments.length === 0) return utf8Slice(this, 0, length)
+  return slowToString.apply(this, arguments)
+}
+
+Buffer.prototype.toLocaleString = Buffer.prototype.toString
+
+Buffer.prototype.equals = function equals (b) {
+  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
+  if (this === b) return true
+  return Buffer.compare(this, b) === 0
+}
+
+Buffer.prototype.inspect = function inspect () {
+  var str = ''
+  var max = exports.INSPECT_MAX_BYTES
+  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
+  if (this.length > max) str += ' ... '
+  return '<Buffer ' + str + '>'
+}
+
+Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
+  if (isInstance(target, Uint8Array)) {
+    target = Buffer.from(target, target.offset, target.byteLength)
+  }
+  if (!Buffer.isBuffer(target)) {
+    throw new TypeError(
+      'The "target" argument must be one of type Buffer or Uint8Array. ' +
+      'Received type ' + (typeof target)
+    )
+  }
+
+  if (start === undefined) {
+    start = 0
+  }
+  if (end === undefined) {
+    end = target ? target.length : 0
+  }
+  if (thisStart === undefined) {
+    thisStart = 0
+  }
+  if (thisEnd === undefined) {
+    thisEnd = this.length
+  }
+
+  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
+    throw new RangeError('out of range index')
+  }
+
+  if (thisStart >= thisEnd && start >= end) {
+    return 0
+  }
+  if (thisStart >= thisEnd) {
+    return -1
+  }
+  if (start >= end) {
+    return 1
+  }
+
+  start >>>= 0
+  end >>>= 0
+  thisStart >>>= 0
+  thisEnd >>>= 0
+
+  if (this === target) return 0
+
+  var x = thisEnd - thisStart
+  var y = end - start
+  var len = Math.min(x, y)
+
+  var thisCopy = this.slice(thisStart, thisEnd)
+  var targetCopy = target.slice(start, end)
+
+  for (var i = 0; i < len; ++i) {
+    if (thisCopy[i] !== targetCopy[i]) {
+      x = thisCopy[i]
+      y = targetCopy[i]
+      break
+    }
+  }
+
+  if (x < y) return -1
+  if (y < x) return 1
+  return 0
+}
+
+// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
+// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
+//
+// Arguments:
+// - buffer - a Buffer to search
+// - val - a string, Buffer, or number
+// - byteOffset - an index into `buffer`; will be clamped to an int32
+// - encoding - an optional encoding, relevant is val is a string
+// - dir - true for indexOf, false for lastIndexOf
+function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
+  // Empty buffer means no match
+  if (buffer.length === 0) return -1
+
+  // Normalize byteOffset
+  if (typeof byteOffset === 'string') {
+    encoding = byteOffset
+    byteOffset = 0
+  } else if (byteOffset > 0x7fffffff) {
+    byteOffset = 0x7fffffff
+  } else if (byteOffset < -0x80000000) {
+    byteOffset = -0x80000000
+  }
+  byteOffset = +byteOffset // Coerce to Number.
+  if (numberIsNaN(byteOffset)) {
+    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
+    byteOffset = dir ? 0 : (buffer.length - 1)
+  }
+
+  // Normalize byteOffset: negative offsets start from the end of the buffer
+  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
+  if (byteOffset >= buffer.length) {
+    if (dir) return -1
+    else byteOffset = buffer.length - 1
+  } else if (byteOffset < 0) {
+    if (dir) byteOffset = 0
+    else return -1
+  }
+
+  // Normalize val
+  if (typeof val === 'string') {
+    val = Buffer.from(val, encoding)
+  }
+
+  // Finally, search either indexOf (if dir is true) or lastIndexOf
+  if (Buffer.isBuffer(val)) {
+    // Special case: looking for empty string/buffer always fails
+    if (val.length === 0) {
+      return -1
+    }
+    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
+  } else if (typeof val === 'number') {
+    val = val & 0xFF // Search for a byte value [0-255]
+    if (typeof Uint8Array.prototype.indexOf === 'function') {
+      if (dir) {
+        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
+      } else {
+        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
+      }
+    }
+    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
+  }
+
+  throw new TypeError('val must be string, number or Buffer')
+}
+
+function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
+  var indexSize = 1
+  var arrLength = arr.length
+  var valLength = val.length
+
+  if (encoding !== undefined) {
+    encoding = String(encoding).toLowerCase()
+    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
+        encoding === 'utf16le' || encoding === 'utf-16le') {
+      if (arr.length < 2 || val.length < 2) {
+        return -1
+      }
+      indexSize = 2
+      arrLength /= 2
+      valLength /= 2
+      byteOffset /= 2
+    }
+  }
+
+  function read (buf, i) {
+    if (indexSize === 1) {
+      return buf[i]
+    } else {
+      return buf.readUInt16BE(i * indexSize)
+    }
+  }
+
+  var i
+  if (dir) {
+    var foundIndex = -1
+    for (i = byteOffset; i < arrLength; i++) {
+      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
+        if (foundIndex === -1) foundIndex = i
+        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
+      } else {
+        if (foundIndex !== -1) i -= i - foundIndex
+        foundIndex = -1
+      }
+    }
+  } else {
+    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
+    for (i = byteOffset; i >= 0; i--) {
+      var found = true
+      for (var j = 0; j < valLength; j++) {
+        if (read(arr, i + j) !== read(val, j)) {
+          found = false
+          break
+        }
+      }
+      if (found) return i
+    }
+  }
+
+  return -1
+}
+
+Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
+  return this.indexOf(val, byteOffset, encoding) !== -1
+}
+
+Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
+  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
+}
+
+Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
+  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
+}
+
+function hexWrite (buf, string, offset, length) {
+  offset = Number(offset) || 0
+  var remaining = buf.length - offset
+  if (!length) {
+    length = remaining
+  } else {
+    length = Number(length)
+    if (length > remaining) {
+      length = remaining
+    }
+  }
+
+  var strLen = string.length
+
+  if (length > strLen / 2) {
+    length = strLen / 2
+  }
+  for (var i = 0; i < length; ++i) {
+    var parsed = parseInt(string.substr(i * 2, 2), 16)
+    if (numberIsNaN(parsed)) return i
+    buf[offset + i] = parsed
+  }
+  return i
+}
+
+function utf8Write (buf, string, offset, length) {
+  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
+}
+
+function asciiWrite (buf, string, offset, length) {
+  return blitBuffer(asciiToBytes(string), buf, offset, length)
+}
+
+function latin1Write (buf, string, offset, length) {
+  return asciiWrite(buf, string, offset, length)
+}
+
+function base64Write (buf, string, offset, length) {
+  return blitBuffer(base64ToBytes(string), buf, offset, length)
+}
+
+function ucs2Write (buf, string, offset, length) {
+  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
+}
+
+Buffer.prototype.write = function write (string, offset, length, encoding) {
+  // Buffer#write(string)
+  if (offset === undefined) {
+    encoding = 'utf8'
+    length = this.length
+    offset = 0
+  // Buffer#write(string, encoding)
+  } else if (length === undefined && typeof offset === 'string') {
+    encoding = offset
+    length = this.length
+    offset = 0
+  // Buffer#write(string, offset[, length][, encoding])
+  } else if (isFinite(offset)) {
+    offset = offset >>> 0
+    if (isFinite(length)) {
+      length = length >>> 0
+      if (encoding === undefined) encoding = 'utf8'
+    } else {
+      encoding = length
+      length = undefined
+    }
+  } else {
+    throw new Error(
+      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
+    )
+  }
+
+  var remaining = this.length - offset
+  if (length === undefined || length > remaining) length = remaining
+
+  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
+    throw new RangeError('Attempt to write outside buffer bounds')
+  }
+
+  if (!encoding) encoding = 'utf8'
+
+  var loweredCase = false
+  for (;;) {
+    switch (encoding) {
+      case 'hex':
+        return hexWrite(this, string, offset, length)
+
+      case 'utf8':
+      case 'utf-8':
+        return utf8Write(this, string, offset, length)
+
+      case 'ascii':
+        return asciiWrite(this, string, offset, length)
+
+      case 'latin1':
+      case 'binary':
+        return latin1Write(this, string, offset, length)
+
+      case 'base64':
+        // Warning: maxLength not taken into account in base64Write
+        return base64Write(this, string, offset, length)
+
+      case 'ucs2':
+      case 'ucs-2':
+      case 'utf16le':
+      case 'utf-16le':
+        return ucs2Write(this, string, offset, length)
+
+      default:
+        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
+        encoding = ('' + encoding).toLowerCase()
+        loweredCase = true
+    }
+  }
+}
+
+Buffer.prototype.toJSON = function toJSON () {
+  return {
+    type: 'Buffer',
+    data: Array.prototype.slice.call(this._arr || this, 0)
+  }
+}
+
+function base64Slice (buf, start, end) {
+  if (start === 0 && end === buf.length) {
+    return base64.fromByteArray(buf)
+  } else {
+    return base64.fromByteArray(buf.slice(start, end))
+  }
+}
+
+function utf8Slice (buf, start, end) {
+  end = Math.min(buf.length, end)
+  var res = []
+
+  var i = start
+  while (i < end) {
+    var firstByte = buf[i]
+    var codePoint = null
+    var bytesPerSequence = (firstByte > 0xEF) ? 4
+      : (firstByte > 0xDF) ? 3
+        : (firstByte > 0xBF) ? 2
+          : 1
+
+    if (i + bytesPerSequence <= end) {
+      var secondByte, thirdByte, fourthByte, tempCodePoint
+
+      switch (bytesPerSequence) {
+        case 1:
+          if (firstByte < 0x80) {
+            codePoint = firstByte
+          }
+          break
+        case 2:
+          secondByte = buf[i + 1]
+          if ((secondByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
+            if (tempCodePoint > 0x7F) {
+              codePoint = tempCodePoint
+            }
+          }
+          break
+        case 3:
+          secondByte = buf[i + 1]
+          thirdByte = buf[i + 2]
+          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
+            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
+              codePoint = tempCodePoint
+            }
+          }
+          break
+        case 4:
+          secondByte = buf[i + 1]
+          thirdByte = buf[i + 2]
+          fourthByte = buf[i + 3]
+          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
+            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
+            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
+              codePoint = tempCodePoint
+            }
+          }
+      }
+    }
+
+    if (codePoint === null) {
+      // we did not generate a valid codePoint so insert a
+      // replacement char (U+FFFD) and advance only 1 byte
+      codePoint = 0xFFFD
+      bytesPerSequence = 1
+    } else if (codePoint > 0xFFFF) {
+      // encode to utf16 (surrogate pair dance)
+      codePoint -= 0x10000
+      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
+      codePoint = 0xDC00 | codePoint & 0x3FF
+    }
+
+    res.push(codePoint)
+    i += bytesPerSequence
+  }
+
+  return decodeCodePointsArray(res)
+}
+
+// Based on http://stackoverflow.com/a/22747272/680742, the browser with
+// the lowest limit is Chrome, with 0x10000 args.
+// We go 1 magnitude less, for safety
+var MAX_ARGUMENTS_LENGTH = 0x1000
+
+function decodeCodePointsArray (codePoints) {
+  var len = codePoints.length
+  if (len <= MAX_ARGUMENTS_LENGTH) {
+    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
+  }
+
+  // Decode in chunks to avoid "call stack size exceeded".
+  var res = ''
+  var i = 0
+  while (i < len) {
+    res += String.fromCharCode.apply(
+      String,
+      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
+    )
+  }
+  return res
+}
+
+function asciiSlice (buf, start, end) {
+  var ret = ''
+  end = Math.min(buf.length, end)
+
+  for (var i = start; i < end; ++i) {
+    ret += String.fromCharCode(buf[i] & 0x7F)
+  }
+  return ret
+}
+
+function latin1Slice (buf, start, end) {
+  var ret = ''
+  end = Math.min(buf.length, end)
+
+  for (var i = start; i < end; ++i) {
+    ret += String.fromCharCode(buf[i])
+  }
+  return ret
+}
+
+function hexSlice (buf, start, end) {
+  var len = buf.length
+
+  if (!start || start < 0) start = 0
+  if (!end || end < 0 || end > len) end = len
+
+  var out = ''
+  for (var i = start; i < end; ++i) {
+    out += toHex(buf[i])
+  }
+  return out
+}
+
+function utf16leSlice (buf, start, end) {
+  var bytes = buf.slice(start, end)
+  var res = ''
+  for (var i = 0; i < bytes.length; i += 2) {
+    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
+  }
+  return res
+}
+
+Buffer.prototype.slice = function slice (start, end) {
+  var len = this.length
+  start = ~~start
+  end = end === undefined ? len : ~~end
+
+  if (start < 0) {
+    start += len
+    if (start < 0) start = 0
+  } else if (start > len) {
+    start = len
+  }
+
+  if (end < 0) {
+    end += len
+    if (end < 0) end = 0
+  } else if (end > len) {
+    end = len
+  }
+
+  if (end < start) end = start
+
+  var newBuf = this.subarray(start, end)
+  // Return an augmented `Uint8Array` instance
+  newBuf.__proto__ = Buffer.prototype
+  return newBuf
+}
+
+/*
+ * Need to make sure that buffer isn't trying to write out of bounds.
+ */
+function checkOffset (offset, ext, length) {
+  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
+  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
+}
+
+Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) checkOffset(offset, byteLength, this.length)
+
+  var val = this[offset]
+  var mul = 1
+  var i = 0
+  while (++i < byteLength && (mul *= 0x100)) {
+    val += this[offset + i] * mul
+  }
+
+  return val
+}
+
+Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) {
+    checkOffset(offset, byteLength, this.length)
+  }
+
+  var val = this[offset + --byteLength]
+  var mul = 1
+  while (byteLength > 0 && (mul *= 0x100)) {
+    val += this[offset + --byteLength] * mul
+  }
+
+  return val
+}
+
+Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 1, this.length)
+  return this[offset]
+}
+
+Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 2, this.length)
+  return this[offset] | (this[offset + 1] << 8)
+}
+
+Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 2, this.length)
+  return (this[offset] << 8) | this[offset + 1]
+}
+
+Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+
+  return ((this[offset]) |
+      (this[offset + 1] << 8) |
+      (this[offset + 2] << 16)) +
+      (this[offset + 3] * 0x1000000)
+}
+
+Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+
+  return (this[offset] * 0x1000000) +
+    ((this[offset + 1] << 16) |
+    (this[offset + 2] << 8) |
+    this[offset + 3])
+}
+
+Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) checkOffset(offset, byteLength, this.length)
+
+  var val = this[offset]
+  var mul = 1
+  var i = 0
+  while (++i < byteLength && (mul *= 0x100)) {
+    val += this[offset + i] * mul
+  }
+  mul *= 0x80
+
+  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
+
+  return val
+}
+
+Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) checkOffset(offset, byteLength, this.length)
+
+  var i = byteLength
+  var mul = 1
+  var val = this[offset + --i]
+  while (i > 0 && (mul *= 0x100)) {
+    val += this[offset + --i] * mul
+  }
+  mul *= 0x80
+
+  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
+
+  return val
+}
+
+Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 1, this.length)
+  if (!(this[offset] & 0x80)) return (this[offset])
+  return ((0xff - this[offset] + 1) * -1)
+}
+
+Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 2, this.length)
+  var val = this[offset] | (this[offset + 1] << 8)
+  return (val & 0x8000) ? val | 0xFFFF0000 : val
+}
+
+Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 2, this.length)
+  var val = this[offset + 1] | (this[offset] << 8)
+  return (val & 0x8000) ? val | 0xFFFF0000 : val
+}
+
+Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+
+  return (this[offset]) |
+    (this[offset + 1] << 8) |
+    (this[offset + 2] << 16) |
+    (this[offset + 3] << 24)
+}
+
+Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+
+  return (this[offset] << 24) |
+    (this[offset + 1] << 16) |
+    (this[offset + 2] << 8) |
+    (this[offset + 3])
+}
+
+Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+  return ieee754.read(this, offset, true, 23, 4)
+}
+
+Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 4, this.length)
+  return ieee754.read(this, offset, false, 23, 4)
+}
+
+Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 8, this.length)
+  return ieee754.read(this, offset, true, 52, 8)
+}
+
+Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
+  offset = offset >>> 0
+  if (!noAssert) checkOffset(offset, 8, this.length)
+  return ieee754.read(this, offset, false, 52, 8)
+}
+
+function checkInt (buf, value, offset, ext, max, min) {
+  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
+  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
+  if (offset + ext > buf.length) throw new RangeError('Index out of range')
+}
+
+Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) {
+    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+    checkInt(this, value, offset, byteLength, maxBytes, 0)
+  }
+
+  var mul = 1
+  var i = 0
+  this[offset] = value & 0xFF
+  while (++i < byteLength && (mul *= 0x100)) {
+    this[offset + i] = (value / mul) & 0xFF
+  }
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert) {
+    var maxBytes = Math.pow(2, 8 * byteLength) - 1
+    checkInt(this, value, offset, byteLength, maxBytes, 0)
+  }
+
+  var i = byteLength - 1
+  var mul = 1
+  this[offset + i] = value & 0xFF
+  while (--i >= 0 && (mul *= 0x100)) {
+    this[offset + i] = (value / mul) & 0xFF
+  }
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
+  this[offset] = (value & 0xff)
+  return offset + 1
+}
+
+Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
+  return offset + 2
+}
+
+Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
+  this[offset] = (value >>> 8)
+  this[offset + 1] = (value & 0xff)
+  return offset + 2
+}
+
+Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
+  this[offset + 3] = (value >>> 24)
+  this[offset + 2] = (value >>> 16)
+  this[offset + 1] = (value >>> 8)
+  this[offset] = (value & 0xff)
+  return offset + 4
+}
+
+Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
+  this[offset] = (value >>> 24)
+  this[offset + 1] = (value >>> 16)
+  this[offset + 2] = (value >>> 8)
+  this[offset + 3] = (value & 0xff)
+  return offset + 4
+}
+
+Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    var limit = Math.pow(2, (8 * byteLength) - 1)
+
+    checkInt(this, value, offset, byteLength, limit - 1, -limit)
+  }
+
+  var i = 0
+  var mul = 1
+  var sub = 0
+  this[offset] = value & 0xFF
+  while (++i < byteLength && (mul *= 0x100)) {
+    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
+      sub = 1
+    }
+    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
+  }
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    var limit = Math.pow(2, (8 * byteLength) - 1)
+
+    checkInt(this, value, offset, byteLength, limit - 1, -limit)
+  }
+
+  var i = byteLength - 1
+  var mul = 1
+  var sub = 0
+  this[offset + i] = value & 0xFF
+  while (--i >= 0 && (mul *= 0x100)) {
+    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
+      sub = 1
+    }
+    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
+  }
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
+  if (value < 0) value = 0xff + value + 1
+  this[offset] = (value & 0xff)
+  return offset + 1
+}
+
+Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
+  return offset + 2
+}
+
+Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
+  this[offset] = (value >>> 8)
+  this[offset + 1] = (value & 0xff)
+  return offset + 2
+}
+
+Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
+  this[offset] = (value & 0xff)
+  this[offset + 1] = (value >>> 8)
+  this[offset + 2] = (value >>> 16)
+  this[offset + 3] = (value >>> 24)
+  return offset + 4
+}
+
+Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
+  if (value < 0) value = 0xffffffff + value + 1
+  this[offset] = (value >>> 24)
+  this[offset + 1] = (value >>> 16)
+  this[offset + 2] = (value >>> 8)
+  this[offset + 3] = (value & 0xff)
+  return offset + 4
+}
+
+function checkIEEE754 (buf, value, offset, ext, max, min) {
+  if (offset + ext > buf.length) throw new RangeError('Index out of range')
+  if (offset < 0) throw new RangeError('Index out of range')
+}
+
+function writeFloat (buf, value, offset, littleEndian, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
+  }
+  ieee754.write(buf, value, offset, littleEndian, 23, 4)
+  return offset + 4
+}
+
+Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
+  return writeFloat(this, value, offset, true, noAssert)
+}
+
+Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
+  return writeFloat(this, value, offset, false, noAssert)
+}
+
+function writeDouble (buf, value, offset, littleEndian, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
+  }
+  ieee754.write(buf, value, offset, littleEndian, 52, 8)
+  return offset + 8
+}
+
+Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
+  return writeDouble(this, value, offset, true, noAssert)
+}
+
+Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
+  return writeDouble(this, value, offset, false, noAssert)
+}
+
+// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
+Buffer.prototype.copy = function copy (target, targetStart, start, end) {
+  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
+  if (!start) start = 0
+  if (!end && end !== 0) end = this.length
+  if (targetStart >= target.length) targetStart = target.length
+  if (!targetStart) targetStart = 0
+  if (end > 0 && end < start) end = start
+
+  // Copy 0 bytes; we're done
+  if (end === start) return 0
+  if (target.length === 0 || this.length === 0) return 0
+
+  // Fatal error conditions
+  if (targetStart < 0) {
+    throw new RangeError('targetStart out of bounds')
+  }
+  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
+  if (end < 0) throw new RangeError('sourceEnd out of bounds')
+
+  // Are we oob?
+  if (end > this.length) end = this.length
+  if (target.length - targetStart < end - start) {
+    end = target.length - targetStart + start
+  }
+
+  var len = end - start
+
+  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
+    // Use built-in when available, missing from IE11
+    this.copyWithin(targetStart, start, end)
+  } else if (this === target && start < targetStart && targetStart < end) {
+    // descending copy from end
+    for (var i = len - 1; i >= 0; --i) {
+      target[i + targetStart] = this[i + start]
+    }
+  } else {
+    Uint8Array.prototype.set.call(
+      target,
+      this.subarray(start, end),
+      targetStart
+    )
+  }
+
+  return len
+}
+
+// Usage:
+//    buffer.fill(number[, offset[, end]])
+//    buffer.fill(buffer[, offset[, end]])
+//    buffer.fill(string[, offset[, end]][, encoding])
+Buffer.prototype.fill = function fill (val, start, end, encoding) {
+  // Handle string cases:
+  if (typeof val === 'string') {
+    if (typeof start === 'string') {
+      encoding = start
+      start = 0
+      end = this.length
+    } else if (typeof end === 'string') {
+      encoding = end
+      end = this.length
+    }
+    if (encoding !== undefined && typeof encoding !== 'string') {
+      throw new TypeError('encoding must be a string')
+    }
+    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
+      throw new TypeError('Unknown encoding: ' + encoding)
+    }
+    if (val.length === 1) {
+      var code = val.charCodeAt(0)
+      if ((encoding === 'utf8' && code < 128) ||
+          encoding === 'latin1') {
+        // Fast path: If `val` fits into a single byte, use that numeric value.
+        val = code
+      }
+    }
+  } else if (typeof val === 'number') {
+    val = val & 255
+  }
+
+  // Invalid ranges are not set to a default, so can range check early.
+  if (start < 0 || this.length < start || this.length < end) {
+    throw new RangeError('Out of range index')
+  }
+
+  if (end <= start) {
+    return this
+  }
+
+  start = start >>> 0
+  end = end === undefined ? this.length : end >>> 0
+
+  if (!val) val = 0
+
+  var i
+  if (typeof val === 'number') {
+    for (i = start; i < end; ++i) {
+      this[i] = val
+    }
+  } else {
+    var bytes = Buffer.isBuffer(val)
+      ? val
+      : Buffer.from(val, encoding)
+    var len = bytes.length
+    if (len === 0) {
+      throw new TypeError('The value "' + val +
+        '" is invalid for argument "value"')
+    }
+    for (i = 0; i < end - start; ++i) {
+      this[i + start] = bytes[i % len]
+    }
+  }
+
+  return this
+}
+
+// HELPER FUNCTIONS
+// ================
+
+var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
+
+function base64clean (str) {
+  // Node takes equal signs as end of the Base64 encoding
+  str = str.split('=')[0]
+  // Node strips out invalid characters like \n and \t from the string, base64-js does not
+  str = str.trim().replace(INVALID_BASE64_RE, '')
+  // Node converts strings with length < 2 to ''
+  if (str.length < 2) return ''
+  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
+  while (str.length % 4 !== 0) {
+    str = str + '='
+  }
+  return str
+}
+
+function toHex (n) {
+  if (n < 16) return '0' + n.toString(16)
+  return n.toString(16)
+}
+
+function utf8ToBytes (string, units) {
+  units = units || Infinity
+  var codePoint
+  var length = string.length
+  var leadSurrogate = null
+  var bytes = []
+
+  for (var i = 0; i < length; ++i) {
+    codePoint = string.charCodeAt(i)
+
+    // is surrogate component
+    if (codePoint > 0xD7FF && codePoint < 0xE000) {
+      // last char was a lead
+      if (!leadSurrogate) {
+        // no lead yet
+        if (codePoint > 0xDBFF) {
+          // unexpected trail
+          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+          continue
+        } else if (i + 1 === length) {
+          // unpaired lead
+          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+          continue
+        }
+
+        // valid lead
+        leadSurrogate = codePoint
+
+        continue
+      }
+
+      // 2 leads in a row
+      if (codePoint < 0xDC00) {
+        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+        leadSurrogate = codePoint
+        continue
+      }
+
+      // valid surrogate pair
+      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
+    } else if (leadSurrogate) {
+      // valid bmp char, but last char was a lead
+      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+    }
+
+    leadSurrogate = null
+
+    // encode utf8
+    if (codePoint < 0x80) {
+      if ((units -= 1) < 0) break
+      bytes.push(codePoint)
+    } else if (codePoint < 0x800) {
+      if ((units -= 2) < 0) break
+      bytes.push(
+        codePoint >> 0x6 | 0xC0,
+        codePoint & 0x3F | 0x80
+      )
+    } else if (codePoint < 0x10000) {
+      if ((units -= 3) < 0) break
+      bytes.push(
+        codePoint >> 0xC | 0xE0,
+        codePoint >> 0x6 & 0x3F | 0x80,
+        codePoint & 0x3F | 0x80
+      )
+    } else if (codePoint < 0x110000) {
+      if ((units -= 4) < 0) break
+      bytes.push(
+        codePoint >> 0x12 | 0xF0,
+        codePoint >> 0xC & 0x3F | 0x80,
+        codePoint >> 0x6 & 0x3F | 0x80,
+        codePoint & 0x3F | 0x80
+      )
+    } else {
+      throw new Error('Invalid code point')
+    }
+  }
+
+  return bytes
+}
+
+function asciiToBytes (str) {
+  var byteArray = []
+  for (var i = 0; i < str.length; ++i) {
+    // Node's code seems to be doing this and not & 0x7F..
+    byteArray.push(str.charCodeAt(i) & 0xFF)
+  }
+  return byteArray
+}
+
+function utf16leToBytes (str, units) {
+  var c, hi, lo
+  var byteArray = []
+  for (var i = 0; i < str.length; ++i) {
+    if ((units -= 2) < 0) break
+
+    c = str.charCodeAt(i)
+    hi = c >> 8
+    lo = c % 256
+    byteArray.push(lo)
+    byteArray.push(hi)
+  }
+
+  return byteArray
+}
+
+function base64ToBytes (str) {
+  return base64.toByteArray(base64clean(str))
+}
+
+function blitBuffer (src, dst, offset, length) {
+  for (var i = 0; i < length; ++i) {
+    if ((i + offset >= dst.length) || (i >= src.length)) break
+    dst[i + offset] = src[i]
+  }
+  return i
+}
+
+// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
+// the `instanceof` check but they should be treated as of that type.
+// See: https://github.com/feross/buffer/issues/166
+function isInstance (obj, type) {
+  return obj instanceof type ||
+    (obj != null && obj.constructor != null && obj.constructor.name != null &&
+      obj.constructor.name === type.name)
+}
+function numberIsNaN (obj) {
+  // For IE11 support
+  return obj !== obj // eslint-disable-line no-self-compare
+}
+
+},{"base64-js":6,"ieee754":8}],8:[function(require,module,exports){
+exports.read = function (buffer, offset, isLE, mLen, nBytes) {
+  var e, m
+  var eLen = (nBytes * 8) - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var nBits = -7
+  var i = isLE ? (nBytes - 1) : 0
+  var d = isLE ? -1 : 1
+  var s = buffer[offset + i]
+
+  i += d
+
+  e = s & ((1 << (-nBits)) - 1)
+  s >>= (-nBits)
+  nBits += eLen
+  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
+
+  m = e & ((1 << (-nBits)) - 1)
+  e >>= (-nBits)
+  nBits += mLen
+  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
+
+  if (e === 0) {
+    e = 1 - eBias
+  } else if (e === eMax) {
+    return m ? NaN : ((s ? -1 : 1) * Infinity)
+  } else {
+    m = m + Math.pow(2, mLen)
+    e = e - eBias
+  }
+  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
+}
+
+exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
+  var e, m, c
+  var eLen = (nBytes * 8) - mLen - 1
+  var eMax = (1 << eLen) - 1
+  var eBias = eMax >> 1
+  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
+  var i = isLE ? 0 : (nBytes - 1)
+  var d = isLE ? 1 : -1
+  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
+
+  value = Math.abs(value)
+
+  if (isNaN(value) || value === Infinity) {
+    m = isNaN(value) ? 1 : 0
+    e = eMax
+  } else {
+    e = Math.floor(Math.log(value) / Math.LN2)
+    if (value * (c = Math.pow(2, -e)) < 1) {
+      e--
+      c *= 2
+    }
+    if (e + eBias >= 1) {
+      value += rt / c
+    } else {
+      value += rt * Math.pow(2, 1 - eBias)
+    }
+    if (value * c >= 2) {
+      e++
+      c /= 2
+    }
+
+    if (e + eBias >= eMax) {
+      m = 0
+      e = eMax
+    } else if (e + eBias >= 1) {
+      m = ((value * c) - 1) * Math.pow(2, mLen)
+      e = e + eBias
+    } else {
+      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
+      e = 0
+    }
+  }
+
+  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+
+  e = (e << mLen) | m
+  eLen += mLen
+  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+
+  buffer[offset + i - d] |= s * 128
+}
+
+},{}]},{},[4]);
diff --git a/frontend/static/js/challenge.js b/frontend/static/js/challenge.js
index 2f5ee85a..7e671d2c 100644
--- a/frontend/static/js/challenge.js
+++ b/frontend/static/js/challenge.js
@@ -266,25 +266,61 @@ angular.module("FICApp", ["ngRoute", "ngSanitize"])
 
 	$scope.ssubmit = function() {
 	    var resp = {}
+	    var check = undefined
 
 	    if ($scope.my.exercices[$rootScope.current_exercice].flags && Object.keys($scope.my.exercices[$rootScope.current_exercice].flags).length)
 	    {
 		resp["flags"] = {};
 		angular.forEach($scope.my.exercices[$rootScope.current_exercice].flags, function(flag,kid) {
-		    resp["flags"][kid] = flag.value;
+		    if (flag.found == null) {
+			if (flag.soluce !== undefined) {
+			    if (check === undefined) check = true;
+
+			    if (flag.value && flag.soluce == b2sum(flag.value))
+				flag.found = new Date();
+			    check &= flag.found;
+			} else {
+			    resp["flags"][kid] = flag.value;
+			}
+		    }
 		});
 	    }
 
 	    if ($scope.my.exercices[$rootScope.current_exercice].mcqs && Object.keys($scope.my.exercices[$rootScope.current_exercice].mcqs).length)
 	    {
+		var soluce = "";
 		resp["mcqs"] = {};
 		angular.forEach($scope.my.exercices[$rootScope.current_exercice].mcqs, function(mcq) {
-		    angular.forEach(mcq.choices, function(choice, cid) {
-			if (choice.value) resp["mcqs"][cid] = choice.value;
-		    })
+		    if (mcq.solved == null) {
+			angular.forEach(mcq.choices, function(choice, cid) {
+			    if (mcq.soluce !== undefined) {
+				if (check === undefined) check = true;
+
+				soluce += choice.value ? "t" : "f";
+			    } else {
+				if (choice.value) resp["mcqs"][cid] = choice.value;
+			    }
+			});
+			if (mcq.soluce !== undefined) {
+			    if (mcq.soluce == b2sum(soluce))
+				mcq.solved = new Date();
+			    check &= mcq.solved;
+			}
+		    }
 		});
 	    }
 
+	    if (check !== undefined)
+	    {
+		$scope.my.exercices[$rootScope.current_exercice].tries += 1;
+		$scope.my.exercices[$rootScope.current_exercice].solved_time = new Date();
+
+		if (check) {
+		    $scope.my.exercices[$rootScope.current_exercice].solved = true;
+		}
+		return;
+	    }
+
 	    $http({ url: "/submit/" + $rootScope.current_exercice, method: "POST", data: resp }).then(function(response, status, header, config) {
 		$rootScope.messageClass = {"text-success": true};
 		$rootScope.message = response.data.errmsg;
diff --git a/frontend/static/views/defi.html b/frontend/static/views/defi.html
index de785142..23472ada 100644
--- a/frontend/static/views/defi.html
+++ b/frontend/static/views/defi.html
@@ -67,12 +67,12 @@
 	</div>
 
 	<div class="col-xl mb-5">
-	  <div class="card border-danger" ng-if="my.team_id && my.exercices[current_exercice] && !(my.exercices[current_exercice].solved)">
+	  <div class="card border-danger" ng-if="my.exercices[current_exercice] && !(my.exercices[current_exercice].solved)">
 	    <div class="card-header bg-danger text-white">
 	      <span class="glyphicon glyphicon-flag" aria-hidden="true"></span> Faire son rapport
 	    </div>
 	    <ul class="list-group" ng-if="(my.exercices[current_exercice].tries || my.exercices[current_exercice].submitted || sberr)">
-	      <li class="list-group-item text-warning" ng-if="my.exercices[current_exercice].tries"><ng-pluralize count="my.exercices[current_exercice].tries" when="{'one': '{} tentative effectuée', 'other': '{} tentatives effectuées'}"></ng-pluralize>. Dernière solution envoyée à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}. <span ng-if="my.exercices[current_exercice].solve_dist"><ng-pluralize count="my.exercices[current_exercice].solve_dist" when="{'one': '{} réponse erronée', 'other': '{} réponses erronées'}"></ng-pluralize>.</span></li>
+	      <li class="list-group-item text-warning" ng-if="my.exercices[current_exercice].solved_time && my.exercices[current_exercice].tries"><ng-pluralize count="my.exercices[current_exercice].tries" when="{'one': '{} tentative effectuée', 'other': '{} tentatives effectuées'}"></ng-pluralize>. Dernière solution envoyée à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}. <span ng-if="my.exercices[current_exercice].solve_dist"><ng-pluralize count="my.exercices[current_exercice].solve_dist" when="{'one': '{} réponse erronée', 'other': '{} réponses erronées'}"></ng-pluralize>.</span></li>
 	      <li class="list-group-item" ng-class="messageClass" ng-if="my.exercices[current_exercice].submitted || sberr"><strong ng-if="!sberr">Votre solution a bien été envoyée !</strong><strong ng-if="sberr">{{ sberr }}</strong> {{ message }}</li>
 	    </ul>
 	    <div class="card-body" ng-if="!my.exercices[current_exercice].submitted || sberr">
@@ -80,7 +80,7 @@
 		<div class="form-group" ng-repeat="(kid,key) in my.exercices[current_exercice].flags">
 		  <label for="sol_{{ kid }}">{{ key.label }}&nbsp;:</label>
 		  <input type="text" class="form-control" id="sol_{{ kid }}" autocomplete="off" name="sol_{{ kid }}" ng-model="key.value" ng-if="!key.found">
-		  <small class="form-text text-muted" ng-if="key.help.length > 0" ng-bind="key.help"></small>
+		  <small class="form-text text-muted" ng-if="!key.found && key.help.length > 0" ng-bind="key.help"></small>
 		  <span class="glyphicon glyphicon-ok form-control-feedback text-success" aria-hidden="true" ng-if="key.found" title="Flag trouvé à {{ key.found | date:'mediumTime'}}"></span>
 		</div>
 
@@ -100,7 +100,7 @@
 	    </div>
 	  </div>
 
-	  <div class="card border-success" ng-if="(my.team_id && my.exercices[current_exercice].solved)">
+	  <div class="card border-success" ng-if="my.exercices[current_exercice].solved">
 	    <div class="card-header bg-success text-white">
 	      <span class="glyphicon glyphicon-flag" aria-hidden="true"></span> Challenge réussi !
 	    </div>
@@ -112,20 +112,13 @@
 	    </div>
 	  </div>
 
-	  <div class="card border-success" ng-if="(!my.team_id && my.exercices[current_exercice].keys)">
+	  <div class="card border-success mt-2" ng-if="my.exercices[current_exercice].video_uri">
 	    <div class="card-header bg-success text-white">
-	      <span class="glyphicon glyphicon-flag" aria-hidden="true"></span> Solution du challenge
+	      <span class="glyphicon glyphicon-blackboard" aria-hidden="true"></span> Solution du challenge
 	    </div>
 	    <div class="card-body">
-	      <p>
-		Vérifiez les clefs que vous trouvez en comparant leur <a href="https://blake2.net/">BLAKE2b</a>&nbsp;:
-	      </p>
-	      <dl class="dl-horizontal" ng-repeat="key in my.exercices[current_exercice].keys">
-		<dt title="{{ key.slice(128) }}">{{ key.slice(128) }}</dt>
-		<dd><samp class="cksum">{{ key.slice(0, 128) }}</samp></dd>
-	      </dl>
 	      <div class="embed-responsive embed-responsive-16by9">
-		<iframe type="text/html" ng-if="my.exercices[current_exercice].video_uri" ng-src="{{ my.exercices[current_exercice].video_uri }}" class="embed-responsive-item">
+		<iframe type="text/html" ng-src="{{ my.exercices[current_exercice].video_uri }}" class="embed-responsive-item">
 		  Regardez la vidéo de résolution de cet exercice&nbsp;: <a ng-href="{{ my.exercices[current_exercice].video_uri }}">{{ my.exercices[current_exercice].video_uri }}</a>.
 		</iframe>
 	      </div>
diff --git a/libfic/team_my.go b/libfic/team_my.go
index cadc31ff..85ff3f36 100644
--- a/libfic/team_my.go
+++ b/libfic/team_my.go
@@ -26,23 +26,25 @@ type myTeamMCQ struct {
 	Justify  bool             `json:"justify,omitempty"`
 	Choices  map[int64]string `json:"choices,omitempty"`
 	Solved   *time.Time       `json:"solved,omitempty"`
+	Soluce   string           `json:"soluce,omitempty"`
 }
 type myTeamFlag struct {
 	Label       string            `json:"label"`
 	Help        string            `json:"help,omitempty"`
 	Solved      *time.Time        `json:"found,omitempty"`
-	Soluce      []byte            `json:"soluce,omitempty"`
+	Soluce      string            `json:"soluce,omitempty"`
 }
 type myTeamExercice struct {
 	ThemeId      int          `json:"theme_id"`
 	Statement    string       `json:"statement"`
+	Overview     string       `json:"overview,omitempty"`
 	Hints        []myTeamHint `json:"hints,omitempty"`
 	Gain         int          `json:"gain"`
 	Files        []myTeamFile `json:"files,omitempty"`
 	Flags        map[int64]myTeamFlag `json:"flags,omitempty"`
 	MCQs         map[int64]myTeamMCQ  `json:"mcqs,omitempty"`
 	SolveDist    int64        `json:"solve_dist,omitempty"`
-	SolvedTime   time.Time    `json:"solved_time,omitempty"`
+	SolvedTime   *time.Time   `json:"solved_time,omitempty"`
 	SolvedRank   int64        `json:"solved_rank,omitempty"`
 	Tries        int64        `json:"tries,omitempty"`
 	VideoURI     string       `json:"video_uri,omitempty"`
@@ -94,22 +96,20 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 				}
 
 				if t == nil {
-					if e.Overview != "" {
-						exercice.Statement = e.Overview
-					}
+					exercice.Overview = e.Overview
 					exercice.VideoURI = e.VideoURI
-					exercice.SolvedRank = 1
 					exercice.Tries = e.TriedCount()
 					exercice.Gain = int(float64(e.Gain) * e.Coefficient)
 				} else {
-					var solved bool
-					solved, exercice.SolvedTime = t.HasSolved(e)
+					solved, stime := t.HasSolved(e)
+					exercice.SolvedTime = &stime
 					exercice.SolvedRank, _ = t.GetSolvedRank(e)
 
 					if solved {
 						exercice.Tries, _ = t.CountTries(e)
 					} else {
-						exercice.Tries, exercice.SolvedTime = t.CountTries(e)
+						exercice.Tries, stime = t.CountTries(e)
+						exercice.SolvedTime = &stime
 						if exercice.Tries > 0 {
 							exercice.SolveDist = t.LastTryDist(e)
 						}
@@ -154,7 +154,7 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 
 				// Expose exercice flags
 
-				var justifiedMCQ map[string]bool
+				var justifiedMCQ map[string][]byte
 				exercice.Flags = map[int64]myTeamFlag{}
 
 				if flags, err := e.GetFlags(); err != nil {
@@ -164,10 +164,10 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 						var flag myTeamFlag
 
 						if k.Label[0] == '%' {
-							justifiedMCQ[k.Label[1:]] = true
+							justifiedMCQ[k.Label[1:]] = k.Checksum
 							continue
 						} else if t == nil {
-							flag.Soluce = k.Checksum
+							flag.Soluce = hex.EncodeToString(k.Checksum)
 						} else if PartialValidation {
 							flag.Solved = t.HasPartiallySolved(k)
 						}
@@ -187,19 +187,33 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 					return nil, err
 				} else {
 					for _, mcq := range mcqs {
-						choices := map[int64]string{}
-						justified := false
+						m := myTeamMCQ{
+							Title: mcq.Title,
+							Choices: map[int64]string{},
+						}
+
+						soluce := ""
+
 						for _, e := range mcq.Entries {
-							choices[e.Id] = e.Label
-							if _, ok := justifiedMCQ[m.Title + "%" + e.Label]; ok {
-								justified = true
+							m.Choices[e.Id] = e.Label
+							if e.Response {
+								soluce += "t"
+							} else {
+								soluce += "f"
+							}
+							if v, ok := justifiedMCQ[m.Title + "%" + e.Label]; ok {
+								m.Justify = true
+								if t == nil {
+									soluce += hex.EncodeToString(v)
+								}
 							}
 						}
 
-						m := myTeamMCQ{mcq.Title, justified, choices, nil}
-
 						if t != nil {
 							m.Solved = t.HasPartiallyRespond(mcq)
+						} else {
+							h := getHashedFlag([]byte(soluce))
+							m.Soluce = hex.EncodeToString(h[:])
 						}
 
 						exercice.MCQs[mcq.Id] = m