init: 1.0.0

pkg/tool/cipher.go

@@ -0,0 +1,19 @@
+package tool
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+)
+
+// GenerateCipher 根据公钥生成固定长度密文
+func GenerateCipher(serverKey string, length int) string {
+	h := hmac.New(sha256.New, []byte(serverKey))
+	hash := h.Sum(nil)
+	hashStr := hex.EncodeToString(hash)
+	// Prevent overflow
+	if length > len(hashStr) {
+		length = len(hashStr)
+	}
+	return hashStr[:length]
+}