X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=gost28147%2Fmac.go;fp=gost28147%2Fmac.go;h=71e80397fdb3e53f7d3e5895fd33049a7bb5ca7c;hb=c19a111af499e05273906e9d5f7c059ab38d6f02;hp=a5a048749767c222f986fb3517f8e97cdc140b07;hpb=b465c131a7dc5dd4563cfa85b5629baeaa403f7b;p=gogost.git

diff --git a/gost28147/mac.go b/gost28147/mac.go
index a5a0487..71e8039 100644
--- a/gost28147/mac.go
+++ b/gost28147/mac.go
@@ -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)