PRF_IPSEC_PRFPLUS_GOSTR3411_2012_{256,512}

[gogost.git] / prfplus / gost.go

diff --git a/prfplus/gost.go b/prfplus/gost.go
new file mode 100644 (file)
index 0000000..659b5b4
--- /dev/null
+++ b/prfplus/gost.go
@@ -0,0 +1,46 @@
+// 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/>.
+
+// PRF_IPSEC_PRFPLUS_GOSTR3411_2012_{256,512} as defined in R 50.1.113-2016.
+package prfplus
+
+import (
+       "crypto/hmac"
+       "hash"
+
+       "go.cypherpunks.ru/gogost/v4/gost34112012256"
+       "go.cypherpunks.ru/gogost/v4/gost34112012512"
+)
+
+type PRFIPsecPRFPlusGOSTR34112012 struct{ h hash.Hash }
+
+func NewPRFIPsecPRFPlusGOSTR34112012256(key []byte) PRFForPlus {
+       return PRFIPsecPRFPlusGOSTR34112012{hmac.New(gost34112012256.New, key)}
+}
+
+func NewPRFIPsecPRFPlusGOSTR34112012512(key []byte) PRFForPlus {
+       return PRFIPsecPRFPlusGOSTR34112012{hmac.New(gost34112012512.New, key)}
+}
+
+func (prf PRFIPsecPRFPlusGOSTR34112012) BlockSize() int {
+       return prf.h.Size()
+}
+
+func (prf PRFIPsecPRFPlusGOSTR34112012) Derive(salt []byte) []byte {
+       prf.h.Write(salt)
+       sum := prf.h.Sum(nil)
+       prf.h.Reset()
+       return sum
+}