re-enable vmess test

hash/id.go

@@ -0,0 +1,51 @@
+package hash
+
+import (
+	"crypto/hmac"
+	"crypto/md5"
+)
+
+type CounterHash interface {
+	Hash(key []byte, counter int64) []byte
+}
+
+type StringHash interface {
+	Hash(key []byte, data []byte) []byte
+}
+
+type TimeHash struct {
+	baseHash StringHash
+}
+
+func NewTimeHash(baseHash StringHash) CounterHash {
+	return TimeHash{
+		baseHash: baseHash,
+	}
+}
+
+func (h TimeHash) Hash(key []byte, counter int64) []byte {
+	counterBytes := int64ToBytes(counter)
+	return h.baseHash.Hash(key, counterBytes)
+}
+
+type HMACHash struct {
+}
+
+func (h HMACHash) Hash(key []byte, data []byte) []byte {
+	hash := hmac.New(md5.New, key)
+	hash.Write(data)
+	return hash.Sum(nil)
+}
+
+func int64ToBytes(value int64) []byte {
+	return []byte{
+		byte(value >> 56),
+		byte(value >> 48),
+		byte(value >> 40),
+		byte(value >> 32),
+		byte(value >> 24),
+		byte(value >> 16),
+		byte(value >> 8),
+		byte(value),
+	}
+}

hash/int.go

@@ -0,0 +1,15 @@
+package hash
+
+import (
+	"crypto/md5"
+)
+
+func Int64Hash(value int64) []byte {
+	md5hash := md5.New()
+	buffer := int64ToBytes(value)
+	md5hash.Write(buffer)
+	md5hash.Write(buffer)
+	md5hash.Write(buffer)
+	md5hash.Write(buffer)
+	return md5hash.Sum(nil)
+}