token-validator: done many challenges

token-validator/token.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+
+	"golang.org/x/crypto/blake2b"
+)
+
+func GenerateToken(pkey []byte, id int, a... []byte) ([]byte, error) {
+	h, err := blake2b.New(blake2b.Size, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	h.Write(pkey)
+	h.Write([]byte(fmt.Sprintf(":%d", id)))
+
+	for _, v := range a {
+		h.Write([]byte(":"))
+		h.Write(v)
+	}
+
+	return h.Sum(nil), nil
+}