Slightly more descriptive errors

[gogost.git] / gost28147 / mac.go

diff --git a/gost28147/mac.go b/gost28147/mac.go
index bcfd52c5ed5044d5eee3f08524e5d5bd588e498b..b49bc7d305f67f720f2cb0cfc2d37cc0bb3795c7 100644 (file)
--- a/gost28147/mac.go
+++ b/gost28147/mac.go
@@ -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("Invalid tag size")
+               return nil, errors.New("gogost/gost28147: invalid tag size")
        }
        if len(iv) != BlockSize {
-               return nil, errors.New("iv length is not equal to blocksize")
+               return nil, errors.New("gogost/gost28147: len(iv) != 8")
        }
        m := MAC{c: c, size: size, iv: iv}
        n2, n1 := block2nvs(iv)