[🚀] add crypto pkg

pkg/crypto/hmac.go

@@ -0,0 +1,36 @@
+package crypto
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"fmt"
+)
+
+// HMACSigner HMAC签名器
+type HMACSigner struct {
+	key []byte
+}
+
+// NewHMACSigner 创建HMAC签名器
+func NewHMACSigner(key string) *HMACSigner {
+	return &HMACSigner{key: []byte(key)}
+}
+
+func (s *HMACSigner) Sign(data []byte) ([]byte, error) {
+	h := hmac.New(sha256.New, s.key)
+	h.Write(data)
+	return h.Sum(nil), nil
+}
+
+func (s *HMACSigner) Verify(data, signature []byte) error {
+	expected, err := s.Sign(data)
+	if err != nil {
+		return err
+	}
+
+	if !hmac.Equal(expected, signature) {
+		return fmt.Errorf("签名验证失败")
+	}
+
+	return nil
+}