Download link for 5.14.1 release

[gogost.git] / gost3410 / vko.go

diff --git a/gost3410/vko.go b/gost3410/vko.go
index a6df7f402b415ddfca6126c265a2973ecb2004be..15732967b9cd0b92bbf7729b7fd9deae7f93dfb2 100644 (file)
--- a/gost3410/vko.go
+++ b/gost3410/vko.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
@@ -16,19 +16,20 @@
 package gost3410
 
 import (
+       "fmt"
        "math/big"
 )
 
 func (prv *PrivateKey) KEK(pub *PublicKey, ukm *big.Int) ([]byte, error) {
        keyX, keyY, err := prv.C.Exp(prv.Key, pub.X, pub.Y)
        if err != nil {
-               return nil, err
+               return nil, fmt.Errorf("gogost/gost3410.PrivateKey.KEK: %w", err)
        }
        u := big.NewInt(0).Set(ukm).Mul(ukm, prv.C.Co)
        if u.Cmp(bigInt1) != 0 {
                keyX, keyY, err = prv.C.Exp(u, keyX, keyY)
                if err != nil {
-                       return nil, err
+                       return nil, fmt.Errorf("gogost/gost3410.PrivateKey.KEK: %w", err)
                }
        }
        pk := PublicKey{prv.C, keyX, keyY}