first

utils/encrypt.go

@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"crypto/aes"
+)
+
+func AesEcbDecrypt(key []byte, src []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	dst := make([]byte, 0, len(src))
+	tmp := make([]byte, aes.BlockSize)
+
+	for i := 0; i < len(src); i += aes.BlockSize {
+		block.Decrypt(tmp, src[i:i+aes.BlockSize])
+
+		if i == len(src)-aes.BlockSize {
+			pad := int(tmp[len(tmp)-1])
+			if pad > aes.BlockSize {
+				pad = 0
+			}
+			dst = append(dst, tmp[:aes.BlockSize-pad]...)
+		} else {
+			dst = append(dst, tmp...)
+		}
+	}
+
+	return dst, nil
+}