// GoGOST -- Pure Go GOST cryptographic functions library // Copyright (C) 2015-2020 Sergey Matveev // // 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 . // GOST R 34.11-2012 hash function. // RFC 6986. package gost34112012 import ( "bytes" "encoding/binary" "errors" "fmt" ) 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 { expectedLen := len(MarshaledName) + 1 + 8 + 3*BlockSize if len(data) < expectedLen { return fmt.Errorf("gogost/internal/gost34112012: len(data) != %d", expectedLen) } if !bytes.HasPrefix(data, []byte(MarshaledName)) { return errors.New("gogost/internal/gost34112012: 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 }