修改握手时的签名算法

code/hash/hash.go

@@ -0,0 +1,40 @@
+package hash
+
+import (
+	"crypto/hmac"
+	"crypto/sha512"
+	"encoding/binary"
+	"hash"
+	"math"
+	"sync"
+	"time"
+)
+
+type Hasher struct {
+	sync.Mutex
+	period uint
+	h      hash.Hash
+}
+
+func New(secret string, period uint) *Hasher {
+	if period == 0 {
+		period = 30
+	}
+	return &Hasher{
+		period: period,
+		h:      hmac.New(sha512.New, []byte(secret)),
+	}
+}
+
+func (h *Hasher) Hash() []byte {
+	now := time.Now()
+	i := math.Floor(float64(now.Unix()) / float64(h.period))
+	var buf [8]byte
+	binary.BigEndian.PutUint64(buf[:], uint64(i))
+	h.Lock()
+	defer h.Unlock()
+	h.h.Reset()
+	h.h.Write(buf[:])
+	ret := h.h.Sum(nil)
+	return ret
+}