--- /dev/null
+// 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/>.
+
+// GOST R 34.11-2012 hash function.
+// RFC 6986.
+package gost34112012
+
+import (
+ "bytes"
+ "encoding/binary"
+ "errors"
+)
+
+const (
+ BlockSize = 64
+
+ MarshaledName = "STREEBOG"
+)
+
+var (
+ pi [256]byte = [256]byte{
+ 0xfc, 0xee, 0xdd, 0x11, 0xcf, 0x6e, 0x31, 0x16,
+ 0xfb, 0xc4, 0xfa, 0xda, 0x23, 0xc5, 0x04, 0x4d,
+ 0xe9, 0x77, 0xf0, 0xdb, 0x93, 0x2e, 0x99, 0xba,
+ 0x17, 0x36, 0xf1, 0xbb, 0x14, 0xcd, 0x5f, 0xc1,
+ 0xf9, 0x18, 0x65, 0x5a, 0xe2, 0x5c, 0xef, 0x21,
+ 0x81, 0x1c, 0x3c, 0x42, 0x8b, 0x01, 0x8e, 0x4f,
+ 0x05, 0x84, 0x02, 0xae, 0xe3, 0x6a, 0x8f, 0xa0,
+ 0x06, 0x0b, 0xed, 0x98, 0x7f, 0xd4, 0xd3, 0x1f,
+ 0xeb, 0x34, 0x2c, 0x51, 0xea, 0xc8, 0x48, 0xab,
+ 0xf2, 0x2a, 0x68, 0xa2, 0xfd, 0x3a, 0xce, 0xcc,
+ 0xb5, 0x70, 0x0e, 0x56, 0x08, 0x0c, 0x76, 0x12,
+ 0xbf, 0x72, 0x13, 0x47, 0x9c, 0xb7, 0x5d, 0x87,
+ 0x15, 0xa1, 0x96, 0x29, 0x10, 0x7b, 0x9a, 0xc7,
+ 0xf3, 0x91, 0x78, 0x6f, 0x9d, 0x9e, 0xb2, 0xb1,
+ 0x32, 0x75, 0x19, 0x3d, 0xff, 0x35, 0x8a, 0x7e,
+ 0x6d, 0x54, 0xc6, 0x80, 0xc3, 0xbd, 0x0d, 0x57,
+ 0xdf, 0xf5, 0x24, 0xa9, 0x3e, 0xa8, 0x43, 0xc9,
+ 0xd7, 0x79, 0xd6, 0xf6, 0x7c, 0x22, 0xb9, 0x03,
+ 0xe0, 0x0f, 0xec, 0xde, 0x7a, 0x94, 0xb0, 0xbc,
+ 0xdc, 0xe8, 0x28, 0x50, 0x4e, 0x33, 0x0a, 0x4a,
+ 0xa7, 0x97, 0x60, 0x73, 0x1e, 0x00, 0x62, 0x44,
+ 0x1a, 0xb8, 0x38, 0x82, 0x64, 0x9f, 0x26, 0x41,
+ 0xad, 0x45, 0x46, 0x92, 0x27, 0x5e, 0x55, 0x2f,
+ 0x8c, 0xa3, 0xa5, 0x7d, 0x69, 0xd5, 0x95, 0x3b,
+ 0x07, 0x58, 0xb3, 0x40, 0x86, 0xac, 0x1d, 0xf7,
+ 0x30, 0x37, 0x6b, 0xe4, 0x88, 0xd9, 0xe7, 0x89,
+ 0xe1, 0x1b, 0x83, 0x49, 0x4c, 0x3f, 0xf8, 0xfe,
+ 0x8d, 0x53, 0xaa, 0x90, 0xca, 0xd8, 0x85, 0x61,
+ 0x20, 0x71, 0x67, 0xa4, 0x2d, 0x2b, 0x09, 0x5b,
+ 0xcb, 0x9b, 0x25, 0xd0, 0xbe, 0xe5, 0x6c, 0x52,
+ 0x59, 0xa6, 0x74, 0xd2, 0xe6, 0xf4, 0xb4, 0xc0,
+ 0xd1, 0x66, 0xaf, 0xc2, 0x39, 0x4b, 0x63, 0xb6,
+ }
+ tau [64]int = [64]int{
+ 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
+ 0x01, 0x09, 0x11, 0x19, 0x21, 0x29, 0x31, 0x39,
+ 0x02, 0x0a, 0x12, 0x1a, 0x22, 0x2a, 0x32, 0x3a,
+ 0x03, 0x0b, 0x13, 0x1b, 0x23, 0x2b, 0x33, 0x3b,
+ 0x04, 0x0c, 0x14, 0x1c, 0x24, 0x2c, 0x34, 0x3c,
+ 0x05, 0x0d, 0x15, 0x1d, 0x25, 0x2d, 0x35, 0x3d,
+ 0x06, 0x0e, 0x16, 0x1e, 0x26, 0x2e, 0x36, 0x3e,
+ 0x07, 0x0f, 0x17, 0x1f, 0x27, 0x2f, 0x37, 0x3f,
+ }
+ c [12][BlockSize]byte = [12][BlockSize]byte{
+ [BlockSize]byte{
+ 0x07, 0x45, 0xa6, 0xf2, 0x59, 0x65, 0x80, 0xdd,
+ 0x23, 0x4d, 0x74, 0xcc, 0x36, 0x74, 0x76, 0x05,
+ 0x15, 0xd3, 0x60, 0xa4, 0x08, 0x2a, 0x42, 0xa2,
+ 0x01, 0x69, 0x67, 0x92, 0x91, 0xe0, 0x7c, 0x4b,
+ 0xfc, 0xc4, 0x85, 0x75, 0x8d, 0xb8, 0x4e, 0x71,
+ 0x16, 0xd0, 0x45, 0x2e, 0x43, 0x76, 0x6a, 0x2f,
+ 0x1f, 0x7c, 0x65, 0xc0, 0x81, 0x2f, 0xcb, 0xeb,
+ 0xe9, 0xda, 0xca, 0x1e, 0xda, 0x5b, 0x08, 0xb1,
+ },
+ [BlockSize]byte{
+ 0xb7, 0x9b, 0xb1, 0x21, 0x70, 0x04, 0x79, 0xe6,
+ 0x56, 0xcd, 0xcb, 0xd7, 0x1b, 0xa2, 0xdd, 0x55,
+ 0xca, 0xa7, 0x0a, 0xdb, 0xc2, 0x61, 0xb5, 0x5c,
+ 0x58, 0x99, 0xd6, 0x12, 0x6b, 0x17, 0xb5, 0x9a,
+ 0x31, 0x01, 0xb5, 0x16, 0x0f, 0x5e, 0xd5, 0x61,
+ 0x98, 0x2b, 0x23, 0x0a, 0x72, 0xea, 0xfe, 0xf3,
+ 0xd7, 0xb5, 0x70, 0x0f, 0x46, 0x9d, 0xe3, 0x4f,
+ 0x1a, 0x2f, 0x9d, 0xa9, 0x8a, 0xb5, 0xa3, 0x6f,
+ },
+ [BlockSize]byte{
+ 0xb2, 0x0a, 0xba, 0x0a, 0xf5, 0x96, 0x1e, 0x99,
+ 0x31, 0xdb, 0x7a, 0x86, 0x43, 0xf4, 0xb6, 0xc2,
+ 0x09, 0xdb, 0x62, 0x60, 0x37, 0x3a, 0xc9, 0xc1,
+ 0xb1, 0x9e, 0x35, 0x90, 0xe4, 0x0f, 0xe2, 0xd3,
+ 0x7b, 0x7b, 0x29, 0xb1, 0x14, 0x75, 0xea, 0xf2,
+ 0x8b, 0x1f, 0x9c, 0x52, 0x5f, 0x5e, 0xf1, 0x06,
+ 0x35, 0x84, 0x3d, 0x6a, 0x28, 0xfc, 0x39, 0x0a,
+ 0xc7, 0x2f, 0xce, 0x2b, 0xac, 0xdc, 0x74, 0xf5,
+ },
+ [BlockSize]byte{
+ 0x2e, 0xd1, 0xe3, 0x84, 0xbc, 0xbe, 0x0c, 0x22,
+ 0xf1, 0x37, 0xe8, 0x93, 0xa1, 0xea, 0x53, 0x34,
+ 0xbe, 0x03, 0x52, 0x93, 0x33, 0x13, 0xb7, 0xd8,
+ 0x75, 0xd6, 0x03, 0xed, 0x82, 0x2c, 0xd7, 0xa9,
+ 0x3f, 0x35, 0x5e, 0x68, 0xad, 0x1c, 0x72, 0x9d,
+ 0x7d, 0x3c, 0x5c, 0x33, 0x7e, 0x85, 0x8e, 0x48,
+ 0xdd, 0xe4, 0x71, 0x5d, 0xa0, 0xe1, 0x48, 0xf9,
+ 0xd2, 0x66, 0x15, 0xe8, 0xb3, 0xdf, 0x1f, 0xef,
+ },
+ [BlockSize]byte{
+ 0x57, 0xfe, 0x6c, 0x7c, 0xfd, 0x58, 0x17, 0x60,
+ 0xf5, 0x63, 0xea, 0xa9, 0x7e, 0xa2, 0x56, 0x7a,
+ 0x16, 0x1a, 0x27, 0x23, 0xb7, 0x00, 0xff, 0xdf,
+ 0xa3, 0xf5, 0x3a, 0x25, 0x47, 0x17, 0xcd, 0xbf,
+ 0xbd, 0xff, 0x0f, 0x80, 0xd7, 0x35, 0x9e, 0x35,
+ 0x4a, 0x10, 0x86, 0x16, 0x1f, 0x1c, 0x15, 0x7f,
+ 0x63, 0x23, 0xa9, 0x6c, 0x0c, 0x41, 0x3f, 0x9a,
+ 0x99, 0x47, 0x47, 0xad, 0xac, 0x6b, 0xea, 0x4b,
+ },
+ [BlockSize]byte{
+ 0x6e, 0x7d, 0x64, 0x46, 0x7a, 0x40, 0x68, 0xfa,
+ 0x35, 0x4f, 0x90, 0x36, 0x72, 0xc5, 0x71, 0xbf,
+ 0xb6, 0xc6, 0xbe, 0xc2, 0x66, 0x1f, 0xf2, 0x0a,
+ 0xb4, 0xb7, 0x9a, 0x1c, 0xb7, 0xa6, 0xfa, 0xcf,
+ 0xc6, 0x8e, 0xf0, 0x9a, 0xb4, 0x9a, 0x7f, 0x18,
+ 0x6c, 0xa4, 0x42, 0x51, 0xf9, 0xc4, 0x66, 0x2d,
+ 0xc0, 0x39, 0x30, 0x7a, 0x3b, 0xc3, 0xa4, 0x6f,
+ 0xd9, 0xd3, 0x3a, 0x1d, 0xae, 0xae, 0x4f, 0xae,
+ },
+ [BlockSize]byte{
+ 0x93, 0xd4, 0x14, 0x3a, 0x4d, 0x56, 0x86, 0x88,
+ 0xf3, 0x4a, 0x3c, 0xa2, 0x4c, 0x45, 0x17, 0x35,
+ 0x04, 0x05, 0x4a, 0x28, 0x83, 0x69, 0x47, 0x06,
+ 0x37, 0x2c, 0x82, 0x2d, 0xc5, 0xab, 0x92, 0x09,
+ 0xc9, 0x93, 0x7a, 0x19, 0x33, 0x3e, 0x47, 0xd3,
+ 0xc9, 0x87, 0xbf, 0xe6, 0xc7, 0xc6, 0x9e, 0x39,
+ 0x54, 0x09, 0x24, 0xbf, 0xfe, 0x86, 0xac, 0x51,
+ 0xec, 0xc5, 0xaa, 0xee, 0x16, 0x0e, 0xc7, 0xf4,
+ },
+ [BlockSize]byte{
+ 0x1e, 0xe7, 0x02, 0xbf, 0xd4, 0x0d, 0x7f, 0xa4,
+ 0xd9, 0xa8, 0x51, 0x59, 0x35, 0xc2, 0xac, 0x36,
+ 0x2f, 0xc4, 0xa5, 0xd1, 0x2b, 0x8d, 0xd1, 0x69,
+ 0x90, 0x06, 0x9b, 0x92, 0xcb, 0x2b, 0x89, 0xf4,
+ 0x9a, 0xc4, 0xdb, 0x4d, 0x3b, 0x44, 0xb4, 0x89,
+ 0x1e, 0xde, 0x36, 0x9c, 0x71, 0xf8, 0xb7, 0x4e,
+ 0x41, 0x41, 0x6e, 0x0c, 0x02, 0xaa, 0xe7, 0x03,
+ 0xa7, 0xc9, 0x93, 0x4d, 0x42, 0x5b, 0x1f, 0x9b,
+ },
+ [BlockSize]byte{
+ 0xdb, 0x5a, 0x23, 0x83, 0x51, 0x44, 0x61, 0x72,
+ 0x60, 0x2a, 0x1f, 0xcb, 0x92, 0xdc, 0x38, 0x0e,
+ 0x54, 0x9c, 0x07, 0xa6, 0x9a, 0x8a, 0x2b, 0x7b,
+ 0xb1, 0xce, 0xb2, 0xdb, 0x0b, 0x44, 0x0a, 0x80,
+ 0x84, 0x09, 0x0d, 0xe0, 0xb7, 0x55, 0xd9, 0x3c,
+ 0x24, 0x42, 0x89, 0x25, 0x1b, 0x3a, 0x7d, 0x3a,
+ 0xde, 0x5f, 0x16, 0xec, 0xd8, 0x9a, 0x4c, 0x94,
+ 0x9b, 0x22, 0x31, 0x16, 0x54, 0x5a, 0x8f, 0x37,
+ },
+ [BlockSize]byte{
+ 0xed, 0x9c, 0x45, 0x98, 0xfb, 0xc7, 0xb4, 0x74,
+ 0xc3, 0xb6, 0x3b, 0x15, 0xd1, 0xfa, 0x98, 0x36,
+ 0xf4, 0x52, 0x76, 0x3b, 0x30, 0x6c, 0x1e, 0x7a,
+ 0x4b, 0x33, 0x69, 0xaf, 0x02, 0x67, 0xe7, 0x9f,
+ 0x03, 0x61, 0x33, 0x1b, 0x8a, 0xe1, 0xff, 0x1f,
+ 0xdb, 0x78, 0x8a, 0xff, 0x1c, 0xe7, 0x41, 0x89,
+ 0xf3, 0xf3, 0xe4, 0xb2, 0x48, 0xe5, 0x2a, 0x38,
+ 0x52, 0x6f, 0x05, 0x80, 0xa6, 0xde, 0xbe, 0xab,
+ },
+ [BlockSize]byte{
+ 0x1b, 0x2d, 0xf3, 0x81, 0xcd, 0xa4, 0xca, 0x6b,
+ 0x5d, 0xd8, 0x6f, 0xc0, 0x4a, 0x59, 0xa2, 0xde,
+ 0x98, 0x6e, 0x47, 0x7d, 0x1d, 0xcd, 0xba, 0xef,
+ 0xca, 0xb9, 0x48, 0xea, 0xef, 0x71, 0x1d, 0x8a,
+ 0x79, 0x66, 0x84, 0x14, 0x21, 0x80, 0x01, 0x20,
+ 0x61, 0x07, 0xab, 0xeb, 0xbb, 0x6b, 0xfa, 0xd8,
+ 0x94, 0xfe, 0x5a, 0x63, 0xcd, 0xc6, 0x02, 0x30,
+ 0xfb, 0x89, 0xc8, 0xef, 0xd0, 0x9e, 0xcd, 0x7b,
+ },
+ [BlockSize]byte{
+ 0x20, 0xd7, 0x1b, 0xf1, 0x4a, 0x92, 0xbc, 0x48,
+ 0x99, 0x1b, 0xb2, 0xd9, 0xd5, 0x17, 0xf4, 0xfa,
+ 0x52, 0x28, 0xe1, 0x88, 0xaa, 0xa4, 0x1d, 0xe7,
+ 0x86, 0xcc, 0x91, 0x18, 0x9d, 0xef, 0x80, 0x5d,
+ 0x9b, 0x9f, 0x21, 0x30, 0xd4, 0x12, 0x20, 0xf8,
+ 0x77, 0x1d, 0xdf, 0xbc, 0x32, 0x3c, 0xa4, 0xcd,
+ 0x7a, 0xb1, 0x49, 0x04, 0xb0, 0x80, 0x13, 0xd2,
+ 0xba, 0x31, 0x16, 0xf1, 0x67, 0xe7, 0x8e, 0x37,
+ },
+ }
+ a [64]uint64 // It is filled in init()
+)
+
+func init() {
+ as := [64][]byte{
+ []byte{0x8e, 0x20, 0xfa, 0xa7, 0x2b, 0xa0, 0xb4, 0x70},
+ []byte{0x47, 0x10, 0x7d, 0xdd, 0x9b, 0x50, 0x5a, 0x38},
+ []byte{0xad, 0x08, 0xb0, 0xe0, 0xc3, 0x28, 0x2d, 0x1c},
+ []byte{0xd8, 0x04, 0x58, 0x70, 0xef, 0x14, 0x98, 0x0e},
+ []byte{0x6c, 0x02, 0x2c, 0x38, 0xf9, 0x0a, 0x4c, 0x07},
+ []byte{0x36, 0x01, 0x16, 0x1c, 0xf2, 0x05, 0x26, 0x8d},
+ []byte{0x1b, 0x8e, 0x0b, 0x0e, 0x79, 0x8c, 0x13, 0xc8},
+ []byte{0x83, 0x47, 0x8b, 0x07, 0xb2, 0x46, 0x87, 0x64},
+ []byte{0xa0, 0x11, 0xd3, 0x80, 0x81, 0x8e, 0x8f, 0x40},
+ []byte{0x50, 0x86, 0xe7, 0x40, 0xce, 0x47, 0xc9, 0x20},
+ []byte{0x28, 0x43, 0xfd, 0x20, 0x67, 0xad, 0xea, 0x10},
+ []byte{0x14, 0xaf, 0xf0, 0x10, 0xbd, 0xd8, 0x75, 0x08},
+ []byte{0x0a, 0xd9, 0x78, 0x08, 0xd0, 0x6c, 0xb4, 0x04},
+ []byte{0x05, 0xe2, 0x3c, 0x04, 0x68, 0x36, 0x5a, 0x02},
+ []byte{0x8c, 0x71, 0x1e, 0x02, 0x34, 0x1b, 0x2d, 0x01},
+ []byte{0x46, 0xb6, 0x0f, 0x01, 0x1a, 0x83, 0x98, 0x8e},
+ []byte{0x90, 0xda, 0xb5, 0x2a, 0x38, 0x7a, 0xe7, 0x6f},
+ []byte{0x48, 0x6d, 0xd4, 0x15, 0x1c, 0x3d, 0xfd, 0xb9},
+ []byte{0x24, 0xb8, 0x6a, 0x84, 0x0e, 0x90, 0xf0, 0xd2},
+ []byte{0x12, 0x5c, 0x35, 0x42, 0x07, 0x48, 0x78, 0x69},
+ []byte{0x09, 0x2e, 0x94, 0x21, 0x8d, 0x24, 0x3c, 0xba},
+ []byte{0x8a, 0x17, 0x4a, 0x9e, 0xc8, 0x12, 0x1e, 0x5d},
+ []byte{0x45, 0x85, 0x25, 0x4f, 0x64, 0x09, 0x0f, 0xa0},
+ []byte{0xac, 0xcc, 0x9c, 0xa9, 0x32, 0x8a, 0x89, 0x50},
+ []byte{0x9d, 0x4d, 0xf0, 0x5d, 0x5f, 0x66, 0x14, 0x51},
+ []byte{0xc0, 0xa8, 0x78, 0xa0, 0xa1, 0x33, 0x0a, 0xa6},
+ []byte{0x60, 0x54, 0x3c, 0x50, 0xde, 0x97, 0x05, 0x53},
+ []byte{0x30, 0x2a, 0x1e, 0x28, 0x6f, 0xc5, 0x8c, 0xa7},
+ []byte{0x18, 0x15, 0x0f, 0x14, 0xb9, 0xec, 0x46, 0xdd},
+ []byte{0x0c, 0x84, 0x89, 0x0a, 0xd2, 0x76, 0x23, 0xe0},
+ []byte{0x06, 0x42, 0xca, 0x05, 0x69, 0x3b, 0x9f, 0x70},
+ []byte{0x03, 0x21, 0x65, 0x8c, 0xba, 0x93, 0xc1, 0x38},
+ []byte{0x86, 0x27, 0x5d, 0xf0, 0x9c, 0xe8, 0xaa, 0xa8},
+ []byte{0x43, 0x9d, 0xa0, 0x78, 0x4e, 0x74, 0x55, 0x54},
+ []byte{0xaf, 0xc0, 0x50, 0x3c, 0x27, 0x3a, 0xa4, 0x2a},
+ []byte{0xd9, 0x60, 0x28, 0x1e, 0x9d, 0x1d, 0x52, 0x15},
+ []byte{0xe2, 0x30, 0x14, 0x0f, 0xc0, 0x80, 0x29, 0x84},
+ []byte{0x71, 0x18, 0x0a, 0x89, 0x60, 0x40, 0x9a, 0x42},
+ []byte{0xb6, 0x0c, 0x05, 0xca, 0x30, 0x20, 0x4d, 0x21},
+ []byte{0x5b, 0x06, 0x8c, 0x65, 0x18, 0x10, 0xa8, 0x9e},
+ []byte{0x45, 0x6c, 0x34, 0x88, 0x7a, 0x38, 0x05, 0xb9},
+ []byte{0xac, 0x36, 0x1a, 0x44, 0x3d, 0x1c, 0x8c, 0xd2},
+ []byte{0x56, 0x1b, 0x0d, 0x22, 0x90, 0x0e, 0x46, 0x69},
+ []byte{0x2b, 0x83, 0x88, 0x11, 0x48, 0x07, 0x23, 0xba},
+ []byte{0x9b, 0xcf, 0x44, 0x86, 0x24, 0x8d, 0x9f, 0x5d},
+ []byte{0xc3, 0xe9, 0x22, 0x43, 0x12, 0xc8, 0xc1, 0xa0},
+ []byte{0xef, 0xfa, 0x11, 0xaf, 0x09, 0x64, 0xee, 0x50},
+ []byte{0xf9, 0x7d, 0x86, 0xd9, 0x8a, 0x32, 0x77, 0x28},
+ []byte{0xe4, 0xfa, 0x20, 0x54, 0xa8, 0x0b, 0x32, 0x9c},
+ []byte{0x72, 0x7d, 0x10, 0x2a, 0x54, 0x8b, 0x19, 0x4e},
+ []byte{0x39, 0xb0, 0x08, 0x15, 0x2a, 0xcb, 0x82, 0x27},
+ []byte{0x92, 0x58, 0x04, 0x84, 0x15, 0xeb, 0x41, 0x9d},
+ []byte{0x49, 0x2c, 0x02, 0x42, 0x84, 0xfb, 0xae, 0xc0},
+ []byte{0xaa, 0x16, 0x01, 0x21, 0x42, 0xf3, 0x57, 0x60},
+ []byte{0x55, 0x0b, 0x8e, 0x9e, 0x21, 0xf7, 0xa5, 0x30},
+ []byte{0xa4, 0x8b, 0x47, 0x4f, 0x9e, 0xf5, 0xdc, 0x18},
+ []byte{0x70, 0xa6, 0xa5, 0x6e, 0x24, 0x40, 0x59, 0x8e},
+ []byte{0x38, 0x53, 0xdc, 0x37, 0x12, 0x20, 0xa2, 0x47},
+ []byte{0x1c, 0xa7, 0x6e, 0x95, 0x09, 0x10, 0x51, 0xad},
+ []byte{0x0e, 0xdd, 0x37, 0xc4, 0x8a, 0x08, 0xa6, 0xd8},
+ []byte{0x07, 0xe0, 0x95, 0x62, 0x45, 0x04, 0x53, 0x6c},
+ []byte{0x8d, 0x70, 0xc4, 0x31, 0xac, 0x02, 0xa7, 0x36},
+ []byte{0xc8, 0x38, 0x62, 0x96, 0x56, 0x01, 0xdd, 0x1b},
+ []byte{0x64, 0x1c, 0x31, 0x4b, 0x2b, 0x8e, 0xe0, 0x83},
+ }
+ for i := 0; i < 64; i++ {
+ a[i] = binary.BigEndian.Uint64(as[i])
+ }
+}
+
+type Hash struct {
+ size int
+ buf []byte
+ n uint64
+ hsh *[BlockSize]byte
+ chk *[BlockSize]byte
+ tmp *[BlockSize]byte
+}
+
+// Create new hash object with specified size digest size.
+func New(size int) *Hash {
+ if size != 32 && size != 64 {
+ panic("size must be either 32 or 64")
+ }
+ h := Hash{
+ size: size,
+ hsh: new([BlockSize]byte),
+ chk: new([BlockSize]byte),
+ tmp: new([BlockSize]byte),
+ }
+ h.Reset()
+ return &h
+}
+
+func (h *Hash) Reset() {
+ h.n = 0
+ h.buf = nil
+ for i := 0; i < BlockSize; i++ {
+ h.chk[i] = 0
+ if h.size == 32 {
+ h.hsh[i] = 1
+ } else {
+ h.hsh[i] = 0
+ }
+ }
+}
+
+func (h *Hash) BlockSize() int {
+ return BlockSize
+}
+
+func (h *Hash) Size() int {
+ return h.size
+}
+
+func (h *Hash) Write(data []byte) (int, error) {
+ h.buf = append(h.buf, data...)
+ for len(h.buf) >= BlockSize {
+ copy(h.tmp[:], h.buf[:BlockSize])
+ h.hsh = g(h.n, h.hsh, h.tmp)
+ h.chk = add512bit(h.chk, h.tmp)
+ h.n += BlockSize * 8
+ h.buf = h.buf[BlockSize:]
+ }
+ return len(data), nil
+}
+
+func (h *Hash) Sum(in []byte) []byte {
+ buf := new([BlockSize]byte)
+ copy(h.tmp[:], buf[:])
+ copy(buf[:], h.buf[:])
+ buf[len(h.buf)] = 1
+ hsh := g(h.n, h.hsh, buf)
+ binary.LittleEndian.PutUint64(h.tmp[:], h.n+uint64(len(h.buf))*8)
+ hsh = g(0, hsh, h.tmp)
+ hsh = g(0, hsh, add512bit(h.chk, buf))
+ if h.size == 32 {
+ return append(in, hsh[BlockSize/2:]...)
+ }
+ return append(in, hsh[:]...)
+}
+
+func add512bit(chk, data *[BlockSize]byte) *[BlockSize]byte {
+ var ss uint16
+ r := new([BlockSize]byte)
+ for i := 0; i < BlockSize; i++ {
+ ss = uint16(chk[i]) + uint16(data[i]) + (ss >> 8)
+ r[i] = byte(0xFF & ss)
+ }
+ return r
+}
+
+func g(n uint64, hsh, data *[BlockSize]byte) *[BlockSize]byte {
+ ns := make([]byte, 8)
+ binary.LittleEndian.PutUint64(ns, n)
+ r := new([BlockSize]byte)
+ for i := 0; i < 8; i++ {
+ r[i] = hsh[i] ^ ns[i]
+ }
+ copy(r[8:], hsh[8:])
+ return blockXor(blockXor(e(l(ps(r)), data), hsh), data)
+}
+
+func e(k, msg *[BlockSize]byte) *[BlockSize]byte {
+ for i := 0; i < 12; i++ {
+ msg = l(ps(blockXor(k, msg)))
+ k = l(ps(blockXor(k, &c[i])))
+ }
+ return blockXor(k, msg)
+}
+
+func blockXor(x, y *[BlockSize]byte) *[BlockSize]byte {
+ r := new([BlockSize]byte)
+ for i := 0; i < BlockSize; i++ {
+ r[i] = x[i] ^ y[i]
+ }
+ return r
+}
+
+func ps(data *[BlockSize]byte) *[BlockSize]byte {
+ r := new([BlockSize]byte)
+ for i := 0; i < BlockSize; i++ {
+ r[tau[i]] = pi[int(data[i])]
+ }
+ return r
+}
+
+func l(data *[BlockSize]byte) *[BlockSize]byte {
+ var val uint64
+ var res64 uint64
+ var j int
+ r := new([BlockSize]byte)
+ for i := 0; i < 8; i++ {
+ val = binary.LittleEndian.Uint64(data[i*8 : i*8+8])
+ res64 = 0
+ for j = 0; j < BlockSize; j++ {
+ if val&0x8000000000000000 > 0 {
+ res64 ^= a[j]
+ }
+ val <<= 1
+ }
+ binary.LittleEndian.PutUint64(r[i*8:i*8+8], res64)
+ }
+ return r
+}
+
+func (h *Hash) MarshalBinary() (data []byte, err error) {
+ data = make([]byte, len(MarshaledName)+1+8+3*BlockSize+len(h.buf))
+ copy(data, []byte(MarshaledName))
+ idx := len(MarshaledName)
+ data[idx] = byte(h.size)
+ idx += 1
+ binary.BigEndian.PutUint64(data[idx:idx+8], h.n)
+ idx += 8
+ copy(data[idx:], h.hsh[:])
+ idx += BlockSize
+ copy(data[idx:], h.chk[:])
+ idx += BlockSize
+ copy(data[idx:], h.tmp[:])
+ idx += BlockSize
+ copy(data[idx:], h.buf)
+ return
+}
+
+func (h *Hash) UnmarshalBinary(data []byte) error {
+ if len(data) < len(MarshaledName)+1+8+3*BlockSize {
+ return errors.New("too short data")
+ }
+ if !bytes.HasPrefix(data, []byte(MarshaledName)) {
+ return errors.New("no hash name prefix")
+ }
+ idx := len(MarshaledName)
+ h.size = int(data[idx])
+ idx += 1
+ h.n = binary.BigEndian.Uint64(data[idx : idx+8])
+ idx += 8
+ copy(h.hsh[:], data[idx:])
+ idx += BlockSize
+ copy(h.chk[:], data[idx:])
+ idx += BlockSize
+ copy(h.tmp[:], data[idx:])
+ idx += BlockSize
+ h.buf = data[idx:]
+ return nil
+}