X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=gost28147%2Fmac.go;h=5c8dbda9435effed1e1937a948b51c282d639c2d;hb=HEAD;hp=9c35ab526dfc0448de4df3eb18442e41caca15e2;hpb=c40d1e5634cf6d540d908a57423f4b504e39f186;p=gogost.git

diff --git a/gost28147/mac.go b/gost28147/mac.go
index 9c35ab5..18756c0 100644
--- a/gost28147/mac.go
+++ b/gost28147/mac.go
@@ -1,5 +1,5 @@
 // GoGOST -- Pure Go GOST cryptographic functions library
-// Copyright (C) 2015-2020 Sergey Matveev <stargrave@stargrave.org>
+// Copyright (C) 2015-2024 Sergey Matveev <stargrave@stargrave.org>
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
 package gost28147
 
 import (
-	"errors"
+	"fmt"
 )
 
 var (
@@ -42,10 +42,10 @@ type MAC struct {
 // following ones are fed to Write function.
 func (c *Cipher) NewMAC(size int, iv []byte) (*MAC, error) {
 	if size == 0 || size > 8 {
-		return nil, errors.New("gogost/gost28147: invalid tag size")
+		return nil, fmt.Errorf("gogost/gost28147: invalid tag size (0<%d<=8)", size)
 	}
 	if len(iv) != BlockSize {
-		return nil, errors.New("gogost/gost28147: len(iv) != 8")
+		return nil, fmt.Errorf("gogost/gost28147: len(iv)=%d != %d", len(iv), BlockSize)
 	}
 	m := MAC{c: c, size: size, iv: iv}
 	n2, n1 := block2nvs(iv)