go.cypherpunks.ru namespace usage

[gogost.git] / gost3410 / ukm.go

diff --git a/gost3410/ukm.go b/gost3410/ukm.go
new file mode 100644 (file)
index 0000000..975477d
--- /dev/null
+++ b/gost3410/ukm.go
@@ -0,0 +1,28 @@
+// GoGOST -- Pure Go GOST cryptographic functions library
+// Copyright (C) 2015-2019 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, version 3 of the License.
+//
+// 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))
+       for i := 0; i < len(t); i++ {
+               t[i] = raw[len(raw)-i-1]
+       }
+       return bytes2big(t)
+}