fix aescbc secret ken-length

utils.go

@@ -4,7 +4,7 @@ import "errors"
 
 var (
 	ErrCipherKey=errors.New("The secret key is wrong and cannot be decrypted. Please check")
-	ErrKeyLengthSixteen=errors.New("a sixteen-length secret key is required")
+	ErrKeyLengthSixteen=errors.New("a sixteen or twenty-four or thirty-two length secret key is required")
 	ErrKeyLengtheEight=errors.New("a eight-length secret key is required")
 	ErrKeyLengthTwentyFour=errors.New("a twenty-four-length secret key is required")
 	ErrPaddingSize=errors.New("padding size error please check the secret key or iv")