package gost28147
import (
- "errors"
+ "fmt"
)
var (
// 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)