mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Supraja Meedinti <supraja0493@gmail.com> Reviewed-by: Giorgio Vazzana <mywing81@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/115/head
Supraja Meedinti
10 years ago
committed by
Michael Niedermayer
parent
72db3c79df
commit
6ad749b533
4 changed files with 449 additions and 0 deletions
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/*
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* An implementation of the TwoFish algorithm |
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* Copyright (c) 2015 Supraja Meedinti |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "twofish.h" |
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#include "common.h" |
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#include "intreadwrite.h" |
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#include "attributes.h" |
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#define LR(x, n) ((x) << (n) | (x) >> (32 - (n))) |
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#define RR(x, n) ((x) >> (n) | (x) << (32 - (n))) |
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typedef struct AVTWOFISH { |
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uint32_t K[40]; |
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uint32_t S[4]; |
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int ksize; |
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} AVTWOFISH; |
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static const uint8_t MD1[256] = { |
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0x00, 0x5b, 0xb6, 0xed, 0x05, 0x5e, 0xb3, 0xe8, 0x0a, 0x51, 0xbc, 0xe7, 0x0f, 0x54, 0xb9, 0xe2, |
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0x14, 0x4f, 0xa2, 0xf9, 0x11, 0x4a, 0xa7, 0xfc, 0x1e, 0x45, 0xa8, 0xf3, 0x1b, 0x40, 0xad, 0xf6, |
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0x28, 0x73, 0x9e, 0xc5, 0x2d, 0x76, 0x9b, 0xc0, 0x22, 0x79, 0x94, 0xcf, 0x27, 0x7c, 0x91, 0xca, |
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0x3c, 0x67, 0x8a, 0xd1, 0x39, 0x62, 0x8f, 0xd4, 0x36, 0x6d, 0x80, 0xdb, 0x33, 0x68, 0x85, 0xde, |
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0x50, 0x0b, 0xe6, 0xbd, 0x55, 0x0e, 0xe3, 0xb8, 0x5a, 0x01, 0xec, 0xb7, 0x5f, 0x04, 0xe9, 0xb2, |
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0x44, 0x1f, 0xf2, 0xa9, 0x41, 0x1a, 0xf7, 0xac, 0x4e, 0x15, 0xf8, 0xa3, 0x4b, 0x10, 0xfd, 0xa6, |
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0x78, 0x23, 0xce, 0x95, 0x7d, 0x26, 0xcb, 0x90, 0x72, 0x29, 0xc4, 0x9f, 0x77, 0x2c, 0xc1, 0x9a, |
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0x6c, 0x37, 0xda, 0x81, 0x69, 0x32, 0xdf, 0x84, 0x66, 0x3d, 0xd0, 0x8b, 0x63, 0x38, 0xd5, 0x8e, |
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0xa0, 0xfb, 0x16, 0x4d, 0xa5, 0xfe, 0x13, 0x48, 0xaa, 0xf1, 0x1c, 0x47, 0xaf, 0xf4, 0x19, 0x42, |
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0xb4, 0xef, 0x02, 0x59, 0xb1, 0xea, 0x07, 0x5c, 0xbe, 0xe5, 0x08, 0x53, 0xbb, 0xe0, 0x0d, 0x56, |
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0x88, 0xd3, 0x3e, 0x65, 0x8d, 0xd6, 0x3b, 0x60, 0x82, 0xd9, 0x34, 0x6f, 0x87, 0xdc, 0x31, 0x6a, |
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0x9c, 0xc7, 0x2a, 0x71, 0x99, 0xc2, 0x2f, 0x74, 0x96, 0xcd, 0x20, 0x7b, 0x93, 0xc8, 0x25, 0x7e, |
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0xf0, 0xab, 0x46, 0x1d, 0xf5, 0xae, 0x43, 0x18, 0xfa, 0xa1, 0x4c, 0x17, 0xff, 0xa4, 0x49, 0x12, |
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0xe4, 0xbf, 0x52, 0x09, 0xe1, 0xba, 0x57, 0x0c, 0xee, 0xb5, 0x58, 0x03, 0xeb, 0xb0, 0x5d, 0x06, |
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0xd8, 0x83, 0x6e, 0x35, 0xdd, 0x86, 0x6b, 0x30, 0xd2, 0x89, 0x64, 0x3f, 0xd7, 0x8c, 0x61, 0x3a, |
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0xcc, 0x97, 0x7a, 0x21, 0xc9, 0x92, 0x7f, 0x24, 0xc6, 0x9d, 0x70, 0x2b, 0xc3, 0x98, 0x75, 0x2e |
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}; |
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static const uint8_t MD2[256] = { |
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0x00, 0xef, 0xb7, 0x58, 0x07, 0xe8, 0xb0, 0x5f, 0x0e, 0xe1, 0xb9, 0x56, 0x09, 0xe6, 0xbe, 0x51, |
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0x1c, 0xf3, 0xab, 0x44, 0x1b, 0xf4, 0xac, 0x43, 0x12, 0xfd, 0xa5, 0x4a, 0x15, 0xfa, 0xa2, 0x4d, |
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0x38, 0xd7, 0x8f, 0x60, 0x3f, 0xd0, 0x88, 0x67, 0x36, 0xd9, 0x81, 0x6e, 0x31, 0xde, 0x86, 0x69, |
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0x24, 0xcb, 0x93, 0x7c, 0x23, 0xcc, 0x94, 0x7b, 0x2a, 0xc5, 0x9d, 0x72, 0x2d, 0xc2, 0x9a, 0x75, |
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0x70, 0x9f, 0xc7, 0x28, 0x77, 0x98, 0xc0, 0x2f, 0x7e, 0x91, 0xc9, 0x26, 0x79, 0x96, 0xce, 0x21, |
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0x6c, 0x83, 0xdb, 0x34, 0x6b, 0x84, 0xdc, 0x33, 0x62, 0x8d, 0xd5, 0x3a, 0x65, 0x8a, 0xd2, 0x3d, |
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0x48, 0xa7, 0xff, 0x10, 0x4f, 0xa0, 0xf8, 0x17, 0x46, 0xa9, 0xf1, 0x1e, 0x41, 0xae, 0xf6, 0x19, |
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0x54, 0xbb, 0xe3, 0x0c, 0x53, 0xbc, 0xe4, 0x0b, 0x5a, 0xb5, 0xed, 0x02, 0x5d, 0xb2, 0xea, 0x05, |
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0xe0, 0x0f, 0x57, 0xb8, 0xe7, 0x08, 0x50, 0xbf, 0xee, 0x01, 0x59, 0xb6, 0xe9, 0x06, 0x5e, 0xb1, |
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0xfc, 0x13, 0x4b, 0xa4, 0xfb, 0x14, 0x4c, 0xa3, 0xf2, 0x1d, 0x45, 0xaa, 0xf5, 0x1a, 0x42, 0xad, |
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0xd8, 0x37, 0x6f, 0x80, 0xdf, 0x30, 0x68, 0x87, 0xd6, 0x39, 0x61, 0x8e, 0xd1, 0x3e, 0x66, 0x89, |
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0xc4, 0x2b, 0x73, 0x9c, 0xc3, 0x2c, 0x74, 0x9b, 0xca, 0x25, 0x7d, 0x92, 0xcd, 0x22, 0x7a, 0x95, |
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0x90, 0x7f, 0x27, 0xc8, 0x97, 0x78, 0x20, 0xcf, 0x9e, 0x71, 0x29, 0xc6, 0x99, 0x76, 0x2e, 0xc1, |
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0x8c, 0x63, 0x3b, 0xd4, 0x8b, 0x64, 0x3c, 0xd3, 0x82, 0x6d, 0x35, 0xda, 0x85, 0x6a, 0x32, 0xdd, |
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0xa8, 0x47, 0x1f, 0xf0, 0xaf, 0x40, 0x18, 0xf7, 0xa6, 0x49, 0x11, 0xfe, 0xa1, 0x4e, 0x16, 0xf9, |
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0xb4, 0x5b, 0x03, 0xec, 0xb3, 0x5c, 0x04, 0xeb, 0xba, 0x55, 0x0d, 0xe2, 0xbd, 0x52, 0x0a, 0xe5 |
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}; |
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static const uint8_t q0[256] = { |
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0xa9, 0x67, 0xb3, 0xe8, 0x04, 0xfd, 0xa3, 0x76, 0x9a, 0x92, 0x80, 0x78, 0xe4, 0xdd, 0xd1, 0x38, |
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0x0d, 0xc6, 0x35, 0x98, 0x18, 0xf7, 0xec, 0x6c, 0x43, 0x75, 0x37, 0x26, 0xfa, 0x13, 0x94, 0x48, |
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0xf2, 0xd0, 0x8b, 0x30, 0x84, 0x54, 0xdf, 0x23, 0x19, 0x5b, 0x3d, 0x59, 0xf3, 0xae, 0xa2, 0x82, |
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0x63, 0x01, 0x83, 0x2e, 0xd9, 0x51, 0x9b, 0x7c, 0xa6, 0xeb, 0xa5, 0xbe, 0x16, 0x0c, 0xe3, 0x61, |
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0xc0, 0x8c, 0x3a, 0xf5, 0x73, 0x2c, 0x25, 0x0b, 0xbb, 0x4e, 0x89, 0x6b, 0x53, 0x6a, 0xb4, 0xf1, |
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0xe1, 0xe6, 0xbd, 0x45, 0xe2, 0xf4, 0xb6, 0x66, 0xcc, 0x95, 0x03, 0x56, 0xd4, 0x1c, 0x1e, 0xd7, |
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0xfb, 0xc3, 0x8e, 0xb5, 0xe9, 0xcf, 0xbf, 0xba, 0xea, 0x77, 0x39, 0xaf, 0x33, 0xc9, 0x62, 0x71, |
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0x81, 0x79, 0x09, 0xad, 0x24, 0xcd, 0xf9, 0xd8, 0xe5, 0xc5, 0xb9, 0x4d, 0x44, 0x08, 0x86, 0xe7, |
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0xa1, 0x1d, 0xaa, 0xed, 0x06, 0x70, 0xb2, 0xd2, 0x41, 0x7b, 0xa0, 0x11, 0x31, 0xc2, 0x27, 0x90, |
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0x20, 0xf6, 0x60, 0xff, 0x96, 0x5c, 0xb1, 0xab, 0x9e, 0x9c, 0x52, 0x1b, 0x5f, 0x93, 0x0a, 0xef, |
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0x91, 0x85, 0x49, 0xee, 0x2d, 0x4f, 0x8f, 0x3b, 0x47, 0x87, 0x6d, 0x46, 0xd6, 0x3e, 0x69, 0x64, |
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0x2a, 0xce, 0xcb, 0x2f, 0xfc, 0x97, 0x05, 0x7a, 0xac, 0x7f, 0xd5, 0x1a, 0x4b, 0x0e, 0xa7, 0x5a, |
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0x28, 0x14, 0x3f, 0x29, 0x88, 0x3c, 0x4c, 0x02, 0xb8, 0xda, 0xb0, 0x17, 0x55, 0x1f, 0x8a, 0x7d, |
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0x57, 0xc7, 0x8d, 0x74, 0xb7, 0xc4, 0x9f, 0x72, 0x7e, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34, |
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0x6e, 0x50, 0xde, 0x68, 0x65, 0xbc, 0xdb, 0xf8, 0xc8, 0xa8, 0x2b, 0x40, 0xdc, 0xfe, 0x32, 0xa4, |
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0xca, 0x10, 0x21, 0xf0, 0xd3, 0x5d, 0x0f, 0x00, 0x6f, 0x9d, 0x36, 0x42, 0x4a, 0x5e, 0xc1, 0xe0 |
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}; |
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static const uint8_t q1[256] = { |
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0x75, 0xf3, 0xc6, 0xf4, 0xdb, 0x7b, 0xfb, 0xc8, 0x4a, 0xd3, 0xe6, 0x6b, 0x45, 0x7d, 0xe8, 0x4b, |
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0xd6, 0x32, 0xd8, 0xfd, 0x37, 0x71, 0xf1, 0xe1, 0x30, 0x0f, 0xf8, 0x1b, 0x87, 0xfa, 0x06, 0x3f, |
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0x5e, 0xba, 0xae, 0x5b, 0x8a, 0x00, 0xbc, 0x9d, 0x6d, 0xc1, 0xb1, 0x0e, 0x80, 0x5d, 0xd2, 0xd5, |
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0xa0, 0x84, 0x07, 0x14, 0xb5, 0x90, 0x2c, 0xa3, 0xb2, 0x73, 0x4c, 0x54, 0x92, 0x74, 0x36, 0x51, |
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0x38, 0xb0, 0xbd, 0x5a, 0xfc, 0x60, 0x62, 0x96, 0x6c, 0x42, 0xf7, 0x10, 0x7c, 0x28, 0x27, 0x8c, |
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0x13, 0x95, 0x9c, 0xc7, 0x24, 0x46, 0x3b, 0x70, 0xca, 0xe3, 0x85, 0xcb, 0x11, 0xd0, 0x93, 0xb8, |
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0xa6, 0x83, 0x20, 0xff, 0x9f, 0x77, 0xc3, 0xcc, 0x03, 0x6f, 0x08, 0xbf, 0x40, 0xe7, 0x2b, 0xe2, |
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0x79, 0x0c, 0xaa, 0x82, 0x41, 0x3a, 0xea, 0xb9, 0xe4, 0x9a, 0xa4, 0x97, 0x7e, 0xda, 0x7a, 0x17, |
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0x66, 0x94, 0xa1, 0x1d, 0x3d, 0xf0, 0xde, 0xb3, 0x0b, 0x72, 0xa7, 0x1c, 0xef, 0xd1, 0x53, 0x3e, |
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0x8f, 0x33, 0x26, 0x5f, 0xec, 0x76, 0x2a, 0x49, 0x81, 0x88, 0xee, 0x21, 0xc4, 0x1a, 0xeb, 0xd9, |
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0xc5, 0x39, 0x99, 0xcd, 0xad, 0x31, 0x8b, 0x01, 0x18, 0x23, 0xdd, 0x1f, 0x4e, 0x2d, 0xf9, 0x48, |
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0x4f, 0xf2, 0x65, 0x8e, 0x78, 0x5c, 0x58, 0x19, 0x8d, 0xe5, 0x98, 0x57, 0x67, 0x7f, 0x05, 0x64, |
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0xaf, 0x63, 0xb6, 0xfe, 0xf5, 0xb7, 0x3c, 0xa5, 0xce, 0xe9, 0x68, 0x44, 0xe0, 0x4d, 0x43, 0x69, |
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0x29, 0x2e, 0xac, 0x15, 0x59, 0xa8, 0x0a, 0x9e, 0x6e, 0x47, 0xdf, 0x34, 0x35, 0x6a, 0xcf, 0xdc, |
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0x22, 0xc9, 0xc0, 0x9b, 0x89, 0xd4, 0xed, 0xab, 0x12, 0xa2, 0x0d, 0x52, 0xbb, 0x02, 0x2f, 0xa9, |
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0xd7, 0x61, 0x1e, 0xb4, 0x50, 0x04, 0xf6, 0xc2, 0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xbe, 0x91 |
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}; |
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struct AVTWOFISH *av_twofish_alloc(void) |
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{ |
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return av_mallocz(sizeof(struct AVTWOFISH)); |
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} |
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const int av_twofish_size = sizeof(AVTWOFISH); |
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static uint8_t gfmul(uint8_t a, uint8_t b) |
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{ |
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uint8_t r = 0, t; |
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while (a && b) { |
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if (a & 1) |
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r = r ^ b; |
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t = b & 0x80; |
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b = b << 1; |
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if (t) |
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b = b ^ 0x4d; |
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a = a >> 1; |
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} |
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return r; |
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} |
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static uint32_t tf_RS(uint32_t k0, uint32_t k1) |
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{ |
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uint8_t s[4], m[8]; |
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AV_WL32(m, k0); |
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AV_WL32(m + 4, k1); |
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s[0] = gfmul(0x01, m[0]) ^ gfmul(0xa4, m[1]) ^ gfmul(0x55, m[2]) ^ gfmul(0x87, m[3]) ^ gfmul(0x5a, m[4]) ^ gfmul(0x58, m[5]) ^ gfmul(0xdb, m[6]) ^ gfmul(0x9e, m[7]); |
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s[1] = gfmul(0xa4, m[0]) ^ gfmul(0x56, m[1]) ^ gfmul(0x82, m[2]) ^ gfmul(0xf3, m[3]) ^ gfmul(0x1e, m[4]) ^ gfmul(0xc6, m[5]) ^ gfmul(0x68, m[6]) ^ gfmul(0xe5, m[7]); |
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s[2] = gfmul(0x02, m[0]) ^ gfmul(0xa1, m[1]) ^ gfmul(0xfc, m[2]) ^ gfmul(0xc1, m[3]) ^ gfmul(0x47, m[4]) ^ gfmul(0xae, m[5]) ^ gfmul(0x3d, m[6]) ^ gfmul(0x19, m[7]); |
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s[3] = gfmul(0xa4, m[0]) ^ gfmul(0x55, m[1]) ^ gfmul(0x87, m[2]) ^ gfmul(0x5a, m[3]) ^ gfmul(0x58, m[4]) ^ gfmul(0xdb, m[5]) ^ gfmul(0x9e, m[6]) ^ gfmul(0x03, m[7]); |
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return AV_RL32(s); |
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} |
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static uint32_t tf_h(uint32_t X, uint32_t L[4], int k) |
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{ |
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uint8_t y[4], l[4]; |
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AV_WL32(y, X); |
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if (k == 4) { |
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AV_WL32(l, L[3]); |
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y[0] = q1[y[0]] ^ l[0]; |
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y[1] = q0[y[1]] ^ l[1]; |
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y[2] = q0[y[2]] ^ l[2]; |
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y[3] = q1[y[3]] ^ l[3]; |
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} |
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if (k >= 3) { |
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AV_WL32(l, L[2]); |
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y[0] = q1[y[0]] ^ l[0]; |
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y[1] = q1[y[1]] ^ l[1]; |
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y[2] = q0[y[2]] ^ l[2]; |
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y[3] = q0[y[3]] ^ l[3]; |
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} |
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AV_WL32(l, L[1]); |
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y[0] = q1[q0[q0[y[0]] ^ l[0]] ^ (L[0] & 0xff)]; |
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y[1] = q0[q0[q1[y[1]] ^ l[1]] ^ ((L[0] >> 8) & 0xff)]; |
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y[2] = q1[q1[q0[y[2]] ^ l[2]] ^ ((L[0] >> 16) & 0xff)]; |
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y[3] = q0[q1[q1[y[3]] ^ l[3]] ^ (L[0] >> 24)]; |
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l[0] = y[0] ^ MD2[y[1]] ^ MD1[y[2]] ^ MD1[y[3]]; |
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l[1] = MD1[y[0]] ^ MD2[y[1]] ^ MD2[y[2]] ^ y[3]; |
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l[2] = MD2[y[0]] ^ MD1[y[1]] ^ y[2] ^ MD2[y[3]]; |
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l[3] = MD2[y[0]] ^ y[1] ^ MD2[y[2]] ^ MD1[y[3]]; |
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return AV_RL32(l); |
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} |
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static void twofish_encrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src) |
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{ |
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uint32_t P[4], t0, t1; |
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int i; |
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P[0] = AV_RL32(src) ^ cs->K[0]; |
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P[1] = AV_RL32(src + 4) ^ cs->K[1]; |
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P[2] = AV_RL32(src + 8) ^ cs->K[2]; |
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P[3] = AV_RL32(src + 12) ^ cs->K[3]; |
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for (i = 0; i < 16; i += 2) { |
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t0 = tf_h(P[0], cs->S, cs->ksize); |
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t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); |
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P[2] = RR(P[2] ^ (t0 + t1 + cs->K[2 * i + 8]), 1); |
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P[3] = LR(P[3], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 9]); |
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t0 = tf_h(P[2], cs->S, cs->ksize); |
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t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); |
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P[0] = RR(P[0] ^ (t0 + t1 + cs->K[2 * i + 10]), 1); |
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P[1] = LR(P[1], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 11]); |
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} |
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P[2] ^= cs->K[4]; |
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P[3] ^= cs->K[5]; |
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P[0] ^= cs->K[6]; |
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P[1] ^= cs->K[7]; |
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AV_WL32(dst, P[2]); |
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AV_WL32(dst + 4, P[3]); |
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AV_WL32(dst + 8, P[0]); |
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AV_WL32(dst + 12, P[1]); |
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} |
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static void twofish_decrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, uint8_t *iv) |
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{ |
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uint32_t P[4], t0, t1; |
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int i; |
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P[2] = AV_RL32(src) ^ cs->K[4]; |
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P[3] = AV_RL32(src + 4) ^ cs->K[5]; |
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P[0] = AV_RL32(src + 8) ^ cs->K[6]; |
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P[1] = AV_RL32(src + 12) ^ cs->K[7]; |
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for (i = 15; i >= 0; i -= 2) { |
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t0 = tf_h(P[2], cs->S, cs->ksize); |
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t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); |
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P[0] = LR(P[0], 1) ^ (t0 + t1 + cs->K[2 * i + 8]); |
||||
P[1] = RR(P[1] ^ (t0 + 2 * t1 + cs->K[2 * i + 9]), 1); |
||||
t0 = tf_h(P[0], cs->S, cs->ksize); |
||||
t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); |
||||
P[2] = LR(P[2], 1) ^ (t0 + t1 + cs->K[2 * i + 6]); |
||||
P[3] = RR(P[3] ^ (t0 + 2 * t1 + cs->K[2 * i + 7]), 1); |
||||
} |
||||
P[0] ^= cs->K[0]; |
||||
P[1] ^= cs->K[1]; |
||||
P[2] ^= cs->K[2]; |
||||
P[3] ^= cs->K[3]; |
||||
if (iv) { |
||||
P[0] ^= AV_RL32(iv); |
||||
P[1] ^= AV_RL32(iv + 4); |
||||
P[2] ^= AV_RL32(iv + 8); |
||||
P[3] ^= AV_RL32(iv + 12); |
||||
memcpy(iv, src, 16); |
||||
} |
||||
AV_WL32(dst, P[2]); |
||||
AV_WL32(dst + 4, P[3]); |
||||
AV_WL32(dst + 8, P[0]); |
||||
AV_WL32(dst + 12, P[1]); |
||||
} |
||||
|
||||
av_cold int av_twofish_init(AVTWOFISH *cs, const uint8_t *key, int key_bits) |
||||
{ |
||||
int i; |
||||
uint8_t keypad[32]; |
||||
uint32_t Key[8], Me[4], Mo[4], A, B; |
||||
const uint32_t rho = 0x01010101; |
||||
if (key_bits < 0) |
||||
return -1; |
||||
if (key_bits <= 128) { |
||||
cs->ksize = 2; |
||||
} else if (key_bits <= 192) { |
||||
cs->ksize = 3; |
||||
} else { |
||||
cs->ksize = 4; |
||||
} |
||||
memset(keypad, 0, sizeof(keypad)); |
||||
if (key_bits <= 256) { |
||||
memcpy(keypad, key, key_bits >> 3); |
||||
} else { |
||||
memcpy(keypad, key, 32); |
||||
} |
||||
for (i = 0; i < 2 * cs->ksize ; i++) |
||||
Key[i] = AV_RL32(keypad + 4 * i); |
||||
for (i = 0; i < cs->ksize; i++) { |
||||
Me[i] = Key[2 * i]; |
||||
Mo[i] = Key[2 * i + 1]; |
||||
cs->S[cs->ksize - i - 1] = tf_RS(Me[i], Mo[i]); |
||||
} |
||||
for (i = 0; i < 20; i++) { |
||||
A = tf_h((2 * i) * rho, Me, cs->ksize); |
||||
B = tf_h((2 * i + 1) * rho, Mo, cs->ksize); |
||||
B = LR(B, 8); |
||||
cs->K[2 * i] = A + B; |
||||
cs->K[2 * i + 1] = LR((A + (2 * B)), 9); |
||||
} |
||||
if (cs->ksize << 6 != key_bits) { |
||||
return 1; |
||||
} else { |
||||
return 0; |
||||
} |
||||
} |
||||
|
||||
void av_twofish_crypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) |
||||
{ |
||||
int i; |
||||
while (count--) { |
||||
if (decrypt) { |
||||
twofish_decrypt(cs, dst, src, iv); |
||||
} else { |
||||
if (iv) { |
||||
for (i = 0; i < 16; i++) |
||||
dst[i] = src[i] ^ iv[i]; |
||||
twofish_encrypt(cs, dst, dst); |
||||
memcpy(iv, dst, 16); |
||||
} else { |
||||
twofish_encrypt(cs, dst, src); |
||||
} |
||||
} |
||||
src = src + 16; |
||||
dst = dst + 16; |
||||
} |
||||
} |
||||
|
||||
#ifdef TEST |
||||
#include<stdio.h> |
||||
#include<stdlib.h> |
||||
#include"log.h" |
||||
|
||||
int main(int argc, char *argv[]) |
||||
{ |
||||
uint8_t Key[32] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff |
||||
}; |
||||
const uint8_t rct[6][16] = { |
||||
{0x9f, 0x58, 0x9f, 0x5c, 0xf6, 0x12, 0x2c, 0x32, 0xb6, 0xbf, 0xec, 0x2f, 0x2a, 0xe8, 0xc3, 0x5a}, |
||||
{0xcf, 0xd1, 0xd2, 0xe5, 0xa9, 0xbe, 0x9c, 0xdf, 0x50, 0x1f, 0x13, 0xb8, 0x92, 0xbd, 0x22, 0x48}, |
||||
{0x37, 0x52, 0x7b, 0xe0, 0x05, 0x23, 0x34, 0xb8, 0x9f, 0x0c, 0xfc, 0xca, 0xe8, 0x7c, 0xfa, 0x20}, |
||||
{0x5d, 0x9d, 0x4e, 0xef, 0xfa, 0x91, 0x51, 0x57, 0x55, 0x24, 0xf1, 0x15, 0x81, 0x5a, 0x12, 0xe0}, |
||||
{0xe7, 0x54, 0x49, 0x21, 0x2b, 0xee, 0xf9, 0xf4, 0xa3, 0x90, 0xbd, 0x86, 0x0a, 0x64, 0x09, 0x41}, |
||||
{0x37, 0xfe, 0x26, 0xff, 0x1c, 0xf6, 0x61, 0x75, 0xf5, 0xdd, 0xf4, 0xc3, 0x3b, 0x97, 0xa2, 0x05} |
||||
}; |
||||
uint8_t temp[32], iv[16], rpt[32] = {0}; |
||||
const int kbits[3] = {128, 192, 256}; |
||||
int i, j, err = 0; |
||||
AVTWOFISH *cs; |
||||
cs = av_twofish_alloc(); |
||||
if (!cs) |
||||
return 1; |
||||
for (j = 1; j < 3; j++) { |
||||
av_twofish_init(cs, Key, kbits[j]); |
||||
av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); |
||||
for (i = 0; i < 16; i++) { |
||||
if (rct[j][i] != temp[i]) { |
||||
av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]); |
||||
err = 1; |
||||
} |
||||
} |
||||
av_twofish_crypt(cs, temp, rct[j], 1, NULL, 1); |
||||
for (i = 0; i < 16; i++) { |
||||
if (rpt[i] != temp[i]) { |
||||
av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); |
||||
err = 1; |
||||
} |
||||
} |
||||
} |
||||
for (j = 0; j < 3; j++) { |
||||
memset(Key, 0, sizeof(Key)); |
||||
memset(rpt, 0, sizeof(rpt)); |
||||
for (i = 1; i < 50; i++) { |
||||
av_twofish_init(cs, Key, kbits[j]); |
||||
av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); |
||||
memcpy(Key+16,Key,(kbits[j]-128) >> 3); |
||||
memcpy(Key,rpt,16); |
||||
memcpy(rpt,temp,16); |
||||
} |
||||
for (i = 0; i < 16; i++) { |
||||
if (rct[3 + j][i] != temp[i]) { |
||||
av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[3 + j][i], temp[i]); |
||||
err = 1; |
||||
} |
||||
} |
||||
} |
||||
memset(rpt, 0, sizeof(rpt)); |
||||
memcpy(iv, "HALLO123HALLO123", 16); |
||||
av_twofish_crypt(cs, temp, rpt, 2, iv, 0); |
||||
memcpy(iv, "HALLO123HALLO123", 16); |
||||
av_twofish_crypt(cs, temp, temp, 2, iv, 1); |
||||
for (i = 0; i < 32; i++) { |
||||
if (rpt[i] != temp[i]) { |
||||
av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); |
||||
err = 1; |
||||
} |
||||
} |
||||
av_free(cs); |
||||
return err; |
||||
} |
||||
#endif |
||||
@ -0,0 +1,70 @@ |
||||
/*
|
||||
* An implementation of the TwoFish algorithm |
||||
* Copyright (c) 2015 Supraja Meedinti |
||||
* |
||||
* This file is part of FFmpeg. |
||||
* |
||||
* FFmpeg is free software; you can redistribute it and/or |
||||
* modify it under the terms of the GNU Lesser General Public |
||||
* License as published by the Free Software Foundation; either |
||||
* version 2.1 of the License, or (at your option) any later version. |
||||
* |
||||
* FFmpeg 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 |
||||
* Lesser General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU Lesser General Public |
||||
* License along with FFmpeg; if not, write to the Free Software |
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||
*/ |
||||
|
||||
#ifndef AVUTIL_TWOFISH_H |
||||
#define AVUTIL_TWOFISH_H |
||||
|
||||
#include <stdint.h> |
||||
|
||||
|
||||
/**
|
||||
* @file |
||||
* @brief Public header for libavutil TWOFISH algorithm |
||||
* @defgroup lavu_twofish TWOFISH |
||||
* @ingroup lavu_crypto |
||||
* @{ |
||||
*/ |
||||
|
||||
extern const int av_twofish_size; |
||||
|
||||
struct AVTWOFISH; |
||||
|
||||
/**
|
||||
* Allocate an AVTWOFISH context |
||||
* To free the struct: av_free(ptr) |
||||
*/ |
||||
struct AVTWOFISH *av_twofish_alloc(void); |
||||
|
||||
/**
|
||||
* Initialize an AVTWOFISH context. |
||||
* |
||||
* @param ctx an AVTWOFISH context |
||||
* @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption |
||||
* @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise |
||||
*/ |
||||
int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); |
||||
|
||||
/**
|
||||
* Encrypt or decrypt a buffer using a previously initialized context |
||||
* |
||||
* @param ctx an AVTWOFISH context |
||||
* @param dst destination array, can be equal to src |
||||
* @param src source array, can be equal to dst |
||||
* @param count number of 16 byte blocks |
||||
* @paran iv initialization vector for CBC mode, NULL for ECB mode |
||||
* @param decrypt 0 for encryption, 1 for decryption |
||||
*/ |
||||
void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); |
||||
|
||||
/**
|
||||
* @} |
||||
*/ |
||||
#endif /* AVUTIL_TWOFISH_H */ |
||||
Loading…
Reference in new issue