VKO 34.10-2012 support. DigestSizeX incompatible changes

[gogost.git] / src / cypherpunks.ru / gogost / gost3410 / ukm.go

diff --git a/src/cypherpunks.ru/gogost/gost3410/ukm.go b/src/cypherpunks.ru/gogost/gost3410/ukm.go
new file mode 100644 (file)
index 0000000..4295164
--- /dev/null
+++ b/src/cypherpunks.ru/gogost/gost3410/ukm.go
@@ -0,0 +1,28 @@
+// GoGOST -- Pure Go GOST cryptographic functions library
+// Copyright (C) 2015-2016 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
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package gost3410
+
+import (
+       "math/big"
+)
+
+func NewUKM(raw []byte) *big.Int {
+       t := make([]byte, len(raw))
+       copy(t, raw)
+       reverse(t)
+       return bytes2big(t)
+}