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573 lines
17 KiB
573 lines
17 KiB
/********************************************************************** |
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* gost89.c * |
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* Copyright (c) 2005-2006 Cryptocom LTD * |
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* This file is distributed under the same license as OpenSSL * |
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* * |
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* Implementation of GOST 28147-89 encryption algorithm * |
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* No OpenSSL libraries required to compile and use * |
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* this code * |
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**********************************************************************/ |
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#include <string.h> |
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#include "gost89.h" |
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/*- |
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Substitution blocks from RFC 4357 |
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|
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Note: our implementation of gost 28147-89 algorithm |
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uses S-box matrix rotated 90 degrees counterclockwise, relative to |
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examples given in RFC. |
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*/ |
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|
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/* Substitution blocks from test examples for GOST R 34.11-94*/ |
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gost_subst_block GostR3411_94_TestParamSet = { |
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{0X1, 0XF, 0XD, 0X0, 0X5, 0X7, 0XA, 0X4, 0X9, 0X2, 0X3, 0XE, 0X6, 0XB, |
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0X8, 0XC} |
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, |
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{0XD, 0XB, 0X4, 0X1, 0X3, 0XF, 0X5, 0X9, 0X0, 0XA, 0XE, 0X7, 0X6, 0X8, |
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0X2, 0XC} |
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, |
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{0X4, 0XB, 0XA, 0X0, 0X7, 0X2, 0X1, 0XD, 0X3, 0X6, 0X8, 0X5, 0X9, 0XC, |
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0XF, 0XE} |
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, |
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{0X6, 0XC, 0X7, 0X1, 0X5, 0XF, 0XD, 0X8, 0X4, 0XA, 0X9, 0XE, 0X0, 0X3, |
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0XB, 0X2} |
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, |
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{0X7, 0XD, 0XA, 0X1, 0X0, 0X8, 0X9, 0XF, 0XE, 0X4, 0X6, 0XC, 0XB, 0X2, |
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0X5, 0X3} |
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, |
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{0X5, 0X8, 0X1, 0XD, 0XA, 0X3, 0X4, 0X2, 0XE, 0XF, 0XC, 0X7, 0X6, 0X0, |
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0X9, 0XB} |
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, |
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{0XE, 0XB, 0X4, 0XC, 0X6, 0XD, 0XF, 0XA, 0X2, 0X3, 0X8, 0X1, 0X0, 0X7, |
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0X5, 0X9} |
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, |
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{0X4, 0XA, 0X9, 0X2, 0XD, 0X8, 0X0, 0XE, 0X6, 0XB, 0X1, 0XC, 0X7, 0XF, |
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0X5, 0X3} |
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}; |
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|
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/* Substitution blocks for hash function 1.2.643.2.9.1.6.1 */ |
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gost_subst_block GostR3411_94_CryptoProParamSet = { |
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{0x1, 0x3, 0xA, 0x9, 0x5, 0xB, 0x4, 0xF, 0x8, 0x6, 0x7, 0xE, 0xD, 0x0, |
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0x2, 0xC} |
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, |
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{0xD, 0xE, 0x4, 0x1, 0x7, 0x0, 0x5, 0xA, 0x3, 0xC, 0x8, 0xF, 0x6, 0x2, |
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0x9, 0xB} |
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, |
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{0x7, 0x6, 0x2, 0x4, 0xD, 0x9, 0xF, 0x0, 0xA, 0x1, 0x5, 0xB, 0x8, 0xE, |
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0xC, 0x3} |
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, |
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{0x7, 0x6, 0x4, 0xB, 0x9, 0xC, 0x2, 0xA, 0x1, 0x8, 0x0, 0xE, 0xF, 0xD, |
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0x3, 0x5} |
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, |
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{0x4, 0xA, 0x7, 0xC, 0x0, 0xF, 0x2, 0x8, 0xE, 0x1, 0x6, 0x5, 0xD, 0xB, |
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0x9, 0x3} |
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, |
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{0x7, 0xF, 0xC, 0xE, 0x9, 0x4, 0x1, 0x0, 0x3, 0xB, 0x5, 0x2, 0x6, 0xA, |
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0x8, 0xD} |
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, |
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{0x5, 0xF, 0x4, 0x0, 0x2, 0xD, 0xB, 0x9, 0x1, 0x7, 0x6, 0x3, 0xC, 0xE, |
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0xA, 0x8} |
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, |
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{0xA, 0x4, 0x5, 0x6, 0x8, 0x1, 0x3, 0x7, 0xD, 0xC, 0xE, 0x0, 0x9, 0x2, |
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0xB, 0xF} |
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}; |
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/* Test paramset from GOST 28147 */ |
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gost_subst_block Gost28147_TestParamSet = { |
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{0xC, 0x6, 0x5, 0x2, 0xB, 0x0, 0x9, 0xD, 0x3, 0xE, 0x7, 0xA, 0xF, 0x4, |
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0x1, 0x8} |
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, |
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{0x9, 0xB, 0xC, 0x0, 0x3, 0x6, 0x7, 0x5, 0x4, 0x8, 0xE, 0xF, 0x1, 0xA, |
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0x2, 0xD} |
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, |
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{0x8, 0xF, 0x6, 0xB, 0x1, 0x9, 0xC, 0x5, 0xD, 0x3, 0x7, 0xA, 0x0, 0xE, |
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0x2, 0x4} |
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, |
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{0x3, 0xE, 0x5, 0x9, 0x6, 0x8, 0x0, 0xD, 0xA, 0xB, 0x7, 0xC, 0x2, 0x1, |
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0xF, 0x4} |
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, |
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{0xE, 0x9, 0xB, 0x2, 0x5, 0xF, 0x7, 0x1, 0x0, 0xD, 0xC, 0x6, 0xA, 0x4, |
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0x3, 0x8} |
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, |
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{0xD, 0x8, 0xE, 0xC, 0x7, 0x3, 0x9, 0xA, 0x1, 0x5, 0x2, 0x4, 0x6, 0xF, |
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0x0, 0xB} |
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, |
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{0xC, 0x9, 0xF, 0xE, 0x8, 0x1, 0x3, 0xA, 0x2, 0x7, 0x4, 0xD, 0x6, 0x0, |
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0xB, 0x5} |
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, |
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{0x4, 0x2, 0xF, 0x5, 0x9, 0x1, 0x0, 0x8, 0xE, 0x3, 0xB, 0xC, 0xD, 0x7, |
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0xA, 0x6} |
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}; |
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/* 1.2.643.2.2.31.1 */ |
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gost_subst_block Gost28147_CryptoProParamSetA = { |
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{0xB, 0xA, 0xF, 0x5, 0x0, 0xC, 0xE, 0x8, 0x6, 0x2, 0x3, 0x9, 0x1, 0x7, |
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0xD, 0x4} |
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, |
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{0x1, 0xD, 0x2, 0x9, 0x7, 0xA, 0x6, 0x0, 0x8, 0xC, 0x4, 0x5, 0xF, 0x3, |
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0xB, 0xE} |
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, |
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{0x3, 0xA, 0xD, 0xC, 0x1, 0x2, 0x0, 0xB, 0x7, 0x5, 0x9, 0x4, 0x8, 0xF, |
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0xE, 0x6} |
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, |
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{0xB, 0x5, 0x1, 0x9, 0x8, 0xD, 0xF, 0x0, 0xE, 0x4, 0x2, 0x3, 0xC, 0x7, |
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0xA, 0x6} |
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, |
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{0xE, 0x7, 0xA, 0xC, 0xD, 0x1, 0x3, 0x9, 0x0, 0x2, 0xB, 0x4, 0xF, 0x8, |
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0x5, 0x6} |
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, |
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{0xE, 0x4, 0x6, 0x2, 0xB, 0x3, 0xD, 0x8, 0xC, 0xF, 0x5, 0xA, 0x0, 0x7, |
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0x1, 0x9} |
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, |
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{0x3, 0x7, 0xE, 0x9, 0x8, 0xA, 0xF, 0x0, 0x5, 0x2, 0x6, 0xC, 0xB, 0x4, |
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0xD, 0x1} |
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, |
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{0x9, 0x6, 0x3, 0x2, 0x8, 0xB, 0x1, 0x7, 0xA, 0x4, 0xE, 0xF, 0xC, 0x0, |
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0xD, 0x5} |
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}; |
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/* 1.2.643.2.2.31.2 */ |
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gost_subst_block Gost28147_CryptoProParamSetB = { |
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{0x0, 0x4, 0xB, 0xE, 0x8, 0x3, 0x7, 0x1, 0xA, 0x2, 0x9, 0x6, 0xF, 0xD, |
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0x5, 0xC} |
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, |
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{0x5, 0x2, 0xA, 0xB, 0x9, 0x1, 0xC, 0x3, 0x7, 0x4, 0xD, 0x0, 0x6, 0xF, |
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0x8, 0xE} |
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, |
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{0x8, 0x3, 0x2, 0x6, 0x4, 0xD, 0xE, 0xB, 0xC, 0x1, 0x7, 0xF, 0xA, 0x0, |
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0x9, 0x5} |
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, |
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{0x2, 0x7, 0xC, 0xF, 0x9, 0x5, 0xA, 0xB, 0x1, 0x4, 0x0, 0xD, 0x6, 0x8, |
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0xE, 0x3} |
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, |
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{0x7, 0x5, 0x0, 0xD, 0xB, 0x6, 0x1, 0x2, 0x3, 0xA, 0xC, 0xF, 0x4, 0xE, |
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0x9, 0x8} |
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, |
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{0xE, 0xC, 0x0, 0xA, 0x9, 0x2, 0xD, 0xB, 0x7, 0x5, 0x8, 0xF, 0x3, 0x6, |
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0x1, 0x4} |
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, |
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{0x0, 0x1, 0x2, 0xA, 0x4, 0xD, 0x5, 0xC, 0x9, 0x7, 0x3, 0xF, 0xB, 0x8, |
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0x6, 0xE} |
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, |
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{0x8, 0x4, 0xB, 0x1, 0x3, 0x5, 0x0, 0x9, 0x2, 0xE, 0xA, 0xC, 0xD, 0x6, |
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0x7, 0xF} |
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}; |
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/* 1.2.643.2.2.31.3 */ |
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gost_subst_block Gost28147_CryptoProParamSetC = { |
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{0x7, 0x4, 0x0, 0x5, 0xA, 0x2, 0xF, 0xE, 0xC, 0x6, 0x1, 0xB, 0xD, 0x9, |
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0x3, 0x8} |
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, |
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{0xA, 0x9, 0x6, 0x8, 0xD, 0xE, 0x2, 0x0, 0xF, 0x3, 0x5, 0xB, 0x4, 0x1, |
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0xC, 0x7} |
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, |
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{0xC, 0x9, 0xB, 0x1, 0x8, 0xE, 0x2, 0x4, 0x7, 0x3, 0x6, 0x5, 0xA, 0x0, |
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0xF, 0xD} |
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, |
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{0x8, 0xD, 0xB, 0x0, 0x4, 0x5, 0x1, 0x2, 0x9, 0x3, 0xC, 0xE, 0x6, 0xF, |
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0xA, 0x7} |
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, |
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{0x3, 0x6, 0x0, 0x1, 0x5, 0xD, 0xA, 0x8, 0xB, 0x2, 0x9, 0x7, 0xE, 0xF, |
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0xC, 0x4} |
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, |
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{0x8, 0x2, 0x5, 0x0, 0x4, 0x9, 0xF, 0xA, 0x3, 0x7, 0xC, 0xD, 0x6, 0xE, |
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0x1, 0xB} |
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, |
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{0x0, 0x1, 0x7, 0xD, 0xB, 0x4, 0x5, 0x2, 0x8, 0xE, 0xF, 0xC, 0x9, 0xA, |
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0x6, 0x3} |
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, |
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{0x1, 0xB, 0xC, 0x2, 0x9, 0xD, 0x0, 0xF, 0x4, 0x5, 0x8, 0xE, 0xA, 0x7, |
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0x6, 0x3} |
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}; |
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/* 1.2.643.2.2.31.4 */ |
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gost_subst_block Gost28147_CryptoProParamSetD = { |
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{0x1, 0xA, 0x6, 0x8, 0xF, 0xB, 0x0, 0x4, 0xC, 0x3, 0x5, 0x9, 0x7, 0xD, |
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0x2, 0xE} |
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, |
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{0x3, 0x0, 0x6, 0xF, 0x1, 0xE, 0x9, 0x2, 0xD, 0x8, 0xC, 0x4, 0xB, 0xA, |
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0x5, 0x7} |
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, |
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{0x8, 0x0, 0xF, 0x3, 0x2, 0x5, 0xE, 0xB, 0x1, 0xA, 0x4, 0x7, 0xC, 0x9, |
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0xD, 0x6} |
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, |
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{0x0, 0xC, 0x8, 0x9, 0xD, 0x2, 0xA, 0xB, 0x7, 0x3, 0x6, 0x5, 0x4, 0xE, |
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0xF, 0x1} |
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, |
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{0x1, 0x5, 0xE, 0xC, 0xA, 0x7, 0x0, 0xD, 0x6, 0x2, 0xB, 0x4, 0x9, 0x3, |
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0xF, 0x8} |
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, |
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{0x1, 0xC, 0xB, 0x0, 0xF, 0xE, 0x6, 0x5, 0xA, 0xD, 0x4, 0x8, 0x9, 0x3, |
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0x7, 0x2} |
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, |
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{0xB, 0x6, 0x3, 0x4, 0xC, 0xF, 0xE, 0x2, 0x7, 0xD, 0x8, 0x0, 0x5, 0xA, |
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0x9, 0x1} |
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, |
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{0xF, 0xC, 0x2, 0xA, 0x6, 0x4, 0x5, 0x0, 0x7, 0x9, 0xE, 0xD, 0x1, 0xB, |
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0x8, 0x3} |
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}; |
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const byte CryptoProKeyMeshingKey[] = { |
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0x69, 0x00, 0x72, 0x22, 0x64, 0xC9, 0x04, 0x23, |
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0x8D, 0x3A, 0xDB, 0x96, 0x46, 0xE9, 0x2A, 0xC4, |
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0x18, 0xFE, 0xAC, 0x94, 0x00, 0xED, 0x07, 0x12, |
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0xC0, 0x86, 0xDC, 0xC2, 0xEF, 0x4C, 0xA9, 0x2B |
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}; |
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/* Initialization of gost_ctx subst blocks*/ |
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static void kboxinit(gost_ctx * c, const gost_subst_block * b) |
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{ |
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int i; |
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for (i = 0; i < 256; i++) { |
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c->k87[i] = (b->k8[i >> 4] << 4 | b->k7[i & 15]) << 24; |
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c->k65[i] = (b->k6[i >> 4] << 4 | b->k5[i & 15]) << 16; |
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c->k43[i] = (b->k4[i >> 4] << 4 | b->k3[i & 15]) << 8; |
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c->k21[i] = b->k2[i >> 4] << 4 | b->k1[i & 15]; |
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} |
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} |
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/* Part of GOST 28147 algorithm moved into separate function */ |
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static word32 f(gost_ctx * c, word32 x) |
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{ |
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x = c->k87[x >> 24 & 255] | c->k65[x >> 16 & 255] | |
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c->k43[x >> 8 & 255] | c->k21[x & 255]; |
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/* Rotate left 11 bits */ |
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return x << 11 | x >> (32 - 11); |
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} |
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/* Low-level encryption routine - encrypts one 64 bit block*/ |
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void gostcrypt(gost_ctx * c, const byte * in, byte * out) |
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{ |
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register word32 n1, n2; /* As named in the GOST */ |
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n1 = in[0] | (in[1] << 8) | (in[2] << 16) | (in[3] << 24); |
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n2 = in[4] | (in[5] << 8) | (in[6] << 16) | (in[7] << 24); |
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/* Instead of swapping halves, swap names each round */ |
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n2 ^= f(c, n1 + c->k[0]); |
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n1 ^= f(c, n2 + c->k[1]); |
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n2 ^= f(c, n1 + c->k[2]); |
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n1 ^= f(c, n2 + c->k[3]); |
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n2 ^= f(c, n1 + c->k[4]); |
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n1 ^= f(c, n2 + c->k[5]); |
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n2 ^= f(c, n1 + c->k[6]); |
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n1 ^= f(c, n2 + c->k[7]); |
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n2 ^= f(c, n1 + c->k[0]); |
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n1 ^= f(c, n2 + c->k[1]); |
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n2 ^= f(c, n1 + c->k[2]); |
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n1 ^= f(c, n2 + c->k[3]); |
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n2 ^= f(c, n1 + c->k[4]); |
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n1 ^= f(c, n2 + c->k[5]); |
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n2 ^= f(c, n1 + c->k[6]); |
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n1 ^= f(c, n2 + c->k[7]); |
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n2 ^= f(c, n1 + c->k[0]); |
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n1 ^= f(c, n2 + c->k[1]); |
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n2 ^= f(c, n1 + c->k[2]); |
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n1 ^= f(c, n2 + c->k[3]); |
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n2 ^= f(c, n1 + c->k[4]); |
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n1 ^= f(c, n2 + c->k[5]); |
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n2 ^= f(c, n1 + c->k[6]); |
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n1 ^= f(c, n2 + c->k[7]); |
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|
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n2 ^= f(c, n1 + c->k[7]); |
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n1 ^= f(c, n2 + c->k[6]); |
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n2 ^= f(c, n1 + c->k[5]); |
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n1 ^= f(c, n2 + c->k[4]); |
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n2 ^= f(c, n1 + c->k[3]); |
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n1 ^= f(c, n2 + c->k[2]); |
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n2 ^= f(c, n1 + c->k[1]); |
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n1 ^= f(c, n2 + c->k[0]); |
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out[0] = (byte) (n2 & 0xff); |
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out[1] = (byte) ((n2 >> 8) & 0xff); |
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out[2] = (byte) ((n2 >> 16) & 0xff); |
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out[3] = (byte) (n2 >> 24); |
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out[4] = (byte) (n1 & 0xff); |
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out[5] = (byte) ((n1 >> 8) & 0xff); |
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out[6] = (byte) ((n1 >> 16) & 0xff); |
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out[7] = (byte) (n1 >> 24); |
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} |
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|
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/* Low-level decryption routine. Decrypts one 64-bit block */ |
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void gostdecrypt(gost_ctx * c, const byte * in, byte * out) |
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{ |
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register word32 n1, n2; /* As named in the GOST */ |
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n1 = in[0] | (in[1] << 8) | (in[2] << 16) | (in[3] << 24); |
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n2 = in[4] | (in[5] << 8) | (in[6] << 16) | (in[7] << 24); |
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|
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n2 ^= f(c, n1 + c->k[0]); |
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n1 ^= f(c, n2 + c->k[1]); |
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n2 ^= f(c, n1 + c->k[2]); |
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n1 ^= f(c, n2 + c->k[3]); |
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n2 ^= f(c, n1 + c->k[4]); |
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n1 ^= f(c, n2 + c->k[5]); |
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n2 ^= f(c, n1 + c->k[6]); |
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n1 ^= f(c, n2 + c->k[7]); |
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|
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n2 ^= f(c, n1 + c->k[7]); |
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n1 ^= f(c, n2 + c->k[6]); |
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n2 ^= f(c, n1 + c->k[5]); |
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n1 ^= f(c, n2 + c->k[4]); |
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n2 ^= f(c, n1 + c->k[3]); |
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n1 ^= f(c, n2 + c->k[2]); |
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n2 ^= f(c, n1 + c->k[1]); |
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n1 ^= f(c, n2 + c->k[0]); |
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|
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n2 ^= f(c, n1 + c->k[7]); |
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n1 ^= f(c, n2 + c->k[6]); |
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n2 ^= f(c, n1 + c->k[5]); |
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n1 ^= f(c, n2 + c->k[4]); |
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n2 ^= f(c, n1 + c->k[3]); |
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n1 ^= f(c, n2 + c->k[2]); |
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n2 ^= f(c, n1 + c->k[1]); |
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n1 ^= f(c, n2 + c->k[0]); |
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|
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n2 ^= f(c, n1 + c->k[7]); |
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n1 ^= f(c, n2 + c->k[6]); |
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n2 ^= f(c, n1 + c->k[5]); |
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n1 ^= f(c, n2 + c->k[4]); |
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n2 ^= f(c, n1 + c->k[3]); |
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n1 ^= f(c, n2 + c->k[2]); |
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n2 ^= f(c, n1 + c->k[1]); |
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n1 ^= f(c, n2 + c->k[0]); |
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|
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out[0] = (byte) (n2 & 0xff); |
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out[1] = (byte) ((n2 >> 8) & 0xff); |
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out[2] = (byte) ((n2 >> 16) & 0xff); |
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out[3] = (byte) (n2 >> 24); |
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out[4] = (byte) (n1 & 0xff); |
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out[5] = (byte) ((n1 >> 8) & 0xff); |
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out[6] = (byte) ((n1 >> 16) & 0xff); |
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out[7] = (byte) (n1 >> 24); |
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} |
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|
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/* Encrypts several blocks in ECB mode */ |
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void gost_enc(gost_ctx * c, const byte * clear, byte * cipher, int blocks) |
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{ |
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int i; |
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for (i = 0; i < blocks; i++) { |
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gostcrypt(c, clear, cipher); |
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clear += 8; |
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cipher += 8; |
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} |
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} |
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|
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/* Decrypts several blocks in ECB mode */ |
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void gost_dec(gost_ctx * c, const byte * cipher, byte * clear, int blocks) |
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{ |
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int i; |
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for (i = 0; i < blocks; i++) { |
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gostdecrypt(c, cipher, clear); |
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clear += 8; |
|
cipher += 8; |
|
} |
|
} |
|
|
|
/* Encrypts several full blocks in CFB mode using 8byte IV */ |
|
void gost_enc_cfb(gost_ctx * ctx, const byte * iv, const byte * clear, |
|
byte * cipher, int blocks) |
|
{ |
|
byte cur_iv[8]; |
|
byte gamma[8]; |
|
int i, j; |
|
const byte *in; |
|
byte *out; |
|
memcpy(cur_iv, iv, 8); |
|
for (i = 0, in = clear, out = cipher; i < blocks; i++, in += 8, out += 8) { |
|
gostcrypt(ctx, cur_iv, gamma); |
|
for (j = 0; j < 8; j++) { |
|
cur_iv[j] = out[j] = in[j] ^ gamma[j]; |
|
} |
|
} |
|
} |
|
|
|
/* Decrypts several full blocks in CFB mode using 8byte IV */ |
|
void gost_dec_cfb(gost_ctx * ctx, const byte * iv, const byte * cipher, |
|
byte * clear, int blocks) |
|
{ |
|
byte cur_iv[8]; |
|
byte gamma[8]; |
|
int i, j; |
|
const byte *in; |
|
byte *out; |
|
memcpy(cur_iv, iv, 8); |
|
for (i = 0, in = cipher, out = clear; i < blocks; i++, in += 8, out += 8) { |
|
gostcrypt(ctx, cur_iv, gamma); |
|
for (j = 0; j < 8; j++) { |
|
out[j] = (cur_iv[j] = in[j]) ^ gamma[j]; |
|
} |
|
} |
|
} |
|
|
|
/* Encrypts one block using specified key */ |
|
void gost_enc_with_key(gost_ctx * c, byte * key, byte * inblock, |
|
byte * outblock) |
|
{ |
|
gost_key(c, key); |
|
gostcrypt(c, inblock, outblock); |
|
} |
|
|
|
/* Set 256 bit key into context */ |
|
void gost_key(gost_ctx * c, const byte * k) |
|
{ |
|
int i, j; |
|
for (i = 0, j = 0; i < 8; i++, j += 4) { |
|
c->k[i] = |
|
k[j] | (k[j + 1] << 8) | (k[j + 2] << 16) | (k[j + 3] << 24); |
|
} |
|
} |
|
|
|
/* Retrieve 256-bit key from context */ |
|
void gost_get_key(gost_ctx * c, byte * k) |
|
{ |
|
int i, j; |
|
for (i = 0, j = 0; i < 8; i++, j += 4) { |
|
k[j] = (byte) (c->k[i] & 0xFF); |
|
k[j + 1] = (byte) ((c->k[i] >> 8) & 0xFF); |
|
k[j + 2] = (byte) ((c->k[i] >> 16) & 0xFF); |
|
k[j + 3] = (byte) ((c->k[i] >> 24) & 0xFF); |
|
} |
|
} |
|
|
|
/* Initalize context. Provides default value for subst_block */ |
|
void gost_init(gost_ctx * c, const gost_subst_block * b) |
|
{ |
|
if (!b) { |
|
b = &GostR3411_94_TestParamSet; |
|
} |
|
kboxinit(c, b); |
|
} |
|
|
|
/* Cleans up key from context */ |
|
void gost_destroy(gost_ctx * c) |
|
{ |
|
int i; |
|
for (i = 0; i < 8; i++) |
|
c->k[i] = 0; |
|
} |
|
|
|
/* |
|
* Compute GOST 28147 mac block Parameters gost_ctx *c - context initalized |
|
* with substitution blocks and key buffer - 8-byte mac state buffer block |
|
* 8-byte block to process. |
|
*/ |
|
void mac_block(gost_ctx * c, byte * buffer, const byte * block) |
|
{ |
|
register word32 n1, n2; /* As named in the GOST */ |
|
int i; |
|
for (i = 0; i < 8; i++) { |
|
buffer[i] ^= block[i]; |
|
} |
|
n1 = buffer[0] | (buffer[1] << 8) | (buffer[2] << 16) | (buffer[3] << 24); |
|
n2 = buffer[4] | (buffer[5] << 8) | (buffer[6] << 16) | (buffer[7] << 24); |
|
/* Instead of swapping halves, swap names each round */ |
|
|
|
n2 ^= f(c, n1 + c->k[0]); |
|
n1 ^= f(c, n2 + c->k[1]); |
|
n2 ^= f(c, n1 + c->k[2]); |
|
n1 ^= f(c, n2 + c->k[3]); |
|
n2 ^= f(c, n1 + c->k[4]); |
|
n1 ^= f(c, n2 + c->k[5]); |
|
n2 ^= f(c, n1 + c->k[6]); |
|
n1 ^= f(c, n2 + c->k[7]); |
|
|
|
n2 ^= f(c, n1 + c->k[0]); |
|
n1 ^= f(c, n2 + c->k[1]); |
|
n2 ^= f(c, n1 + c->k[2]); |
|
n1 ^= f(c, n2 + c->k[3]); |
|
n2 ^= f(c, n1 + c->k[4]); |
|
n1 ^= f(c, n2 + c->k[5]); |
|
n2 ^= f(c, n1 + c->k[6]); |
|
n1 ^= f(c, n2 + c->k[7]); |
|
|
|
buffer[0] = (byte) (n1 & 0xff); |
|
buffer[1] = (byte) ((n1 >> 8) & 0xff); |
|
buffer[2] = (byte) ((n1 >> 16) & 0xff); |
|
buffer[3] = (byte) (n1 >> 24); |
|
buffer[4] = (byte) (n2 & 0xff); |
|
buffer[5] = (byte) ((n2 >> 8) & 0xff); |
|
buffer[6] = (byte) ((n2 >> 16) & 0xff); |
|
buffer[7] = (byte) (n2 >> 24); |
|
} |
|
|
|
/* Get mac with specified number of bits from MAC state buffer */ |
|
void get_mac(byte * buffer, int nbits, byte * out) |
|
{ |
|
int nbytes = nbits >> 3; |
|
int rembits = nbits & 7; |
|
int mask = rembits ? ((1 < rembits) - 1) : 0; |
|
int i; |
|
for (i = 0; i < nbytes; i++) |
|
out[i] = buffer[i]; |
|
if (rembits) |
|
out[i] = buffer[i] & mask; |
|
} |
|
|
|
/* |
|
* Compute mac of specified length (in bits) from data. Context should be |
|
* initialized with key and subst blocks |
|
*/ |
|
int gost_mac(gost_ctx * ctx, int mac_len, const unsigned char *data, |
|
unsigned int data_len, unsigned char *mac) |
|
{ |
|
byte buffer[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
|
byte buf2[8]; |
|
unsigned int i; |
|
for (i = 0; i + 8 <= data_len; i += 8) |
|
mac_block(ctx, buffer, data + i); |
|
if (i < data_len) { |
|
memset(buf2, 0, 8); |
|
memcpy(buf2, data + i, data_len - i); |
|
mac_block(ctx, buffer, buf2); |
|
i += 8; |
|
} |
|
if (i == 8) { |
|
memset(buf2, 0, 8); |
|
mac_block(ctx, buffer, buf2); |
|
} |
|
get_mac(buffer, mac_len, mac); |
|
return 1; |
|
} |
|
|
|
/* Compute MAC with non-zero IV. Used in some RFC 4357 algorithms */ |
|
int gost_mac_iv(gost_ctx * ctx, int mac_len, const unsigned char *iv, |
|
const unsigned char *data, unsigned int data_len, |
|
unsigned char *mac) |
|
{ |
|
byte buffer[8]; |
|
byte buf2[8]; |
|
unsigned int i; |
|
memcpy(buffer, iv, 8); |
|
for (i = 0; i + 8 <= data_len; i += 8) |
|
mac_block(ctx, buffer, data + i); |
|
if (i < data_len) { |
|
memset(buf2, 0, 8); |
|
memcpy(buf2, data + i, data_len - i); |
|
mac_block(ctx, buffer, buf2); |
|
i += 8; |
|
} |
|
if (i == 8) { |
|
memset(buf2, 0, 8); |
|
mac_block(ctx, buffer, buf2); |
|
} |
|
get_mac(buffer, mac_len, mac); |
|
return 1; |
|
} |
|
|
|
/* Implements key meshing algorithm by modifing ctx and IV in place */ |
|
void cryptopro_key_meshing(gost_ctx * ctx, unsigned char *iv) |
|
{ |
|
unsigned char newkey[32], newiv[8]; |
|
/* Set static keymeshing key */ |
|
/* "Decrypt" key with keymeshing key */ |
|
gost_dec(ctx, CryptoProKeyMeshingKey, newkey, 4); |
|
/* set new key */ |
|
gost_key(ctx, newkey); |
|
/* Encrypt iv with new key */ |
|
gostcrypt(ctx, iv, newiv); |
|
memcpy(iv, newiv, 8); |
|
}
|
|
|