use more official blake2b checksum

admin/sync/exercice_hints.go

@@ -2,6 +2,7 @@ package sync
 
 import (
 	"bufio"
+	"crypto"
 	"encoding/hex"
 	"fmt"
 	"io"
@@ -11,7 +12,7 @@ import (
 
 	"srs.epita.fr/fic-server/libfic"
 
-	"github.com/dchest/blake2b"
+	_ "golang.org/x/crypto/blake2b"
 )
 
 func SyncExerciceHints(i Importer, exercice fic.Exercice) (errs []string) {
@@ -52,7 +53,7 @@ func SyncExerciceHints(i Importer, exercice fic.Exercice) (errs []string) {
 				// Handle big files as downloadable content
 				if res, err := i.importFile(path.Join(exercice.Path, "hints", hfile), func(filePath string, origin string) (interface{}, error) {
 					// Calculate hash
-					hash512 := blake2b.New512()
+					hash512 := crypto.BLAKE2b_512.New()
 					if fd, err := os.Open(filePath); err != nil {
 						return nil, err
 					} else {

admin/sync/file.go

@@ -13,7 +13,7 @@ import (
 
 	"srs.epita.fr/fic-server/libfic"
 
-	"github.com/dchest/blake2b"
+	"golang.org/x/crypto/blake2b"
 )
 
 type Importer interface {

libfic/file.go

@@ -2,7 +2,8 @@ package fic
 
 import (
 	"bufio"
-	"crypto/sha1"
+	"crypto"
+	_ "crypto/sha1"
 	"encoding/hex"
 	"errors"
 	"io"
@@ -10,7 +11,7 @@ import (
 	"path"
 	"strings"
 
-	"github.com/dchest/blake2b"
+	_ "golang.org/x/crypto/blake2b"
 )
 
 var FilesDir string = "./FILES/"
@@ -110,8 +111,8 @@ func checkFileHash(filePath string, digest []byte) ([]byte, int64, error) {
 		defer fd.Close()
 
 		reader := bufio.NewReader(fd)
-		hash160 := sha1.New()
-		hash512 := blake2b.New512()
+		hash160 := crypto.SHA1.New()
+		hash512 := crypto.BLAKE2b_512.New()
 
 		w := io.MultiWriter(hash160, hash512)
 		if _, err := io.Copy(w, reader); err != nil {

libfic/key.go

@@ -3,7 +3,7 @@ package fic
 import (
 	"time"
 
-	"github.com/dchest/blake2b"
+	"golang.org/x/crypto/blake2b"
 )
 
 type Key struct {
@@ -37,7 +37,7 @@ func (e Exercice) GetKeys() ([]Key, error) {
 	}
 }
 
-func getHashedKey(raw_value string) [blake2b.KeySize]byte {
+func getHashedKey(raw_value string) [blake2b.Size]byte {
 	hash := blake2b.Sum512([]byte(raw_value))
 	return hash
 }