X-Git-Url: http://www.git.cypherpunks.ru/?p=gogost.git;a=blobdiff_plain;f=gost3410%2Fvko2001_test.go;h=80e30ad3a9c435f96719c374e81f156f51678aa8;hp=3f807338cca2432c141e69f049a2b232c384dfc5;hb=f4078e53da769ade0d92e80ad9093040e7f71d58;hpb=f259d4aaa9a6c3c44f0d9d533a87751e0540b1c9;ds=sidebyside

diff --git a/gost3410/vko2001_test.go b/gost3410/vko2001_test.go
index 3f80733..80e30ad 100644
--- a/gost3410/vko2001_test.go
+++ b/gost3410/vko2001_test.go
@@ -18,6 +18,7 @@ package gost3410
 import (
 	"bytes"
 	"encoding/hex"
+	"math/big"
 	"testing"
 	"testing/quick"
 )
@@ -43,6 +44,26 @@ func TestVKO2001(t *testing.T) {
 	}
 }
 
+func TestVKOUKMAltering(t *testing.T) {
+	c := CurveIdtc26gost34102012256paramSetA()
+	ukm := big.NewInt(1)
+	prv, err := NewPrivateKey(c, bytes.Repeat([]byte{0x12}, 32))
+	if err != nil {
+		panic(err)
+	}
+	pub, err := prv.PublicKey()
+	if err != nil {
+		panic(err)
+	}
+	_, err = prv.KEK(pub, ukm)
+	if err != nil {
+		panic(err)
+	}
+	if ukm.Cmp(big.NewInt(1)) != 0 {
+		t.FailNow()
+	}
+}
+
 func TestRandomVKO2001(t *testing.T) {
 	c := CurveIdGostR34102001TestParamSet()
 	f := func(prvRaw1 [32]byte, prvRaw2 [32]byte, ukmRaw [8]byte) bool {