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FFmpeg/libavutil/twofish.c

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  1. /*

  2.  * An implementation of the TwoFish algorithm

  3.  * Copyright (c) 2015 Supraja Meedinti

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. #include "twofish.h"

  22. #include "common.h"

  23. #include "intreadwrite.h"

  24. #include "attributes.h"

  25. 

  26. #define LR(x, n) ((x) << (n) | (x) >> (32 - (n)))

  27. #define RR(x, n) ((x) >> (n) | (x) << (32 - (n)))

  28. 

  29. typedef struct AVTWOFISH {

  30.     uint32_t K[40];

  31.     uint32_t S[4];

  32.     int ksize;

  33. } AVTWOFISH;

  34. 

  35. static const uint8_t MD1[256] = {

  36.     0x00, 0x5b, 0xb6, 0xed, 0x05, 0x5e, 0xb3, 0xe8, 0x0a, 0x51, 0xbc, 0xe7, 0x0f, 0x54, 0xb9, 0xe2,

  37.     0x14, 0x4f, 0xa2, 0xf9, 0x11, 0x4a, 0xa7, 0xfc, 0x1e, 0x45, 0xa8, 0xf3, 0x1b, 0x40, 0xad, 0xf6,

  38.     0x28, 0x73, 0x9e, 0xc5, 0x2d, 0x76, 0x9b, 0xc0, 0x22, 0x79, 0x94, 0xcf, 0x27, 0x7c, 0x91, 0xca,

  39.     0x3c, 0x67, 0x8a, 0xd1, 0x39, 0x62, 0x8f, 0xd4, 0x36, 0x6d, 0x80, 0xdb, 0x33, 0x68, 0x85, 0xde,

  40.     0x50, 0x0b, 0xe6, 0xbd, 0x55, 0x0e, 0xe3, 0xb8, 0x5a, 0x01, 0xec, 0xb7, 0x5f, 0x04, 0xe9, 0xb2,

  41.     0x44, 0x1f, 0xf2, 0xa9, 0x41, 0x1a, 0xf7, 0xac, 0x4e, 0x15, 0xf8, 0xa3, 0x4b, 0x10, 0xfd, 0xa6,

  42.     0x78, 0x23, 0xce, 0x95, 0x7d, 0x26, 0xcb, 0x90, 0x72, 0x29, 0xc4, 0x9f, 0x77, 0x2c, 0xc1, 0x9a,

  43.     0x6c, 0x37, 0xda, 0x81, 0x69, 0x32, 0xdf, 0x84, 0x66, 0x3d, 0xd0, 0x8b, 0x63, 0x38, 0xd5, 0x8e,

  44.     0xa0, 0xfb, 0x16, 0x4d, 0xa5, 0xfe, 0x13, 0x48, 0xaa, 0xf1, 0x1c, 0x47, 0xaf, 0xf4, 0x19, 0x42,

  45.     0xb4, 0xef, 0x02, 0x59, 0xb1, 0xea, 0x07, 0x5c, 0xbe, 0xe5, 0x08, 0x53, 0xbb, 0xe0, 0x0d, 0x56,

  46.     0x88, 0xd3, 0x3e, 0x65, 0x8d, 0xd6, 0x3b, 0x60, 0x82, 0xd9, 0x34, 0x6f, 0x87, 0xdc, 0x31, 0x6a,

  47.     0x9c, 0xc7, 0x2a, 0x71, 0x99, 0xc2, 0x2f, 0x74, 0x96, 0xcd, 0x20, 0x7b, 0x93, 0xc8, 0x25, 0x7e,

  48.     0xf0, 0xab, 0x46, 0x1d, 0xf5, 0xae, 0x43, 0x18, 0xfa, 0xa1, 0x4c, 0x17, 0xff, 0xa4, 0x49, 0x12,

  49.     0xe4, 0xbf, 0x52, 0x09, 0xe1, 0xba, 0x57, 0x0c, 0xee, 0xb5, 0x58, 0x03, 0xeb, 0xb0, 0x5d, 0x06,

  50.     0xd8, 0x83, 0x6e, 0x35, 0xdd, 0x86, 0x6b, 0x30, 0xd2, 0x89, 0x64, 0x3f, 0xd7, 0x8c, 0x61, 0x3a,

  51.     0xcc, 0x97, 0x7a, 0x21, 0xc9, 0x92, 0x7f, 0x24, 0xc6, 0x9d, 0x70, 0x2b, 0xc3, 0x98, 0x75, 0x2e

  52. };

  53. 

  54. static const uint8_t MD2[256] = {

  55.     0x00, 0xef, 0xb7, 0x58, 0x07, 0xe8, 0xb0, 0x5f, 0x0e, 0xe1, 0xb9, 0x56, 0x09, 0xe6, 0xbe, 0x51,

  56.     0x1c, 0xf3, 0xab, 0x44, 0x1b, 0xf4, 0xac, 0x43, 0x12, 0xfd, 0xa5, 0x4a, 0x15, 0xfa, 0xa2, 0x4d,

  57.     0x38, 0xd7, 0x8f, 0x60, 0x3f, 0xd0, 0x88, 0x67, 0x36, 0xd9, 0x81, 0x6e, 0x31, 0xde, 0x86, 0x69,

  58.     0x24, 0xcb, 0x93, 0x7c, 0x23, 0xcc, 0x94, 0x7b, 0x2a, 0xc5, 0x9d, 0x72, 0x2d, 0xc2, 0x9a, 0x75,

  59.     0x70, 0x9f, 0xc7, 0x28, 0x77, 0x98, 0xc0, 0x2f, 0x7e, 0x91, 0xc9, 0x26, 0x79, 0x96, 0xce, 0x21,

  60.     0x6c, 0x83, 0xdb, 0x34, 0x6b, 0x84, 0xdc, 0x33, 0x62, 0x8d, 0xd5, 0x3a, 0x65, 0x8a, 0xd2, 0x3d,

  61.     0x48, 0xa7, 0xff, 0x10, 0x4f, 0xa0, 0xf8, 0x17, 0x46, 0xa9, 0xf1, 0x1e, 0x41, 0xae, 0xf6, 0x19,

  62.     0x54, 0xbb, 0xe3, 0x0c, 0x53, 0xbc, 0xe4, 0x0b, 0x5a, 0xb5, 0xed, 0x02, 0x5d, 0xb2, 0xea, 0x05,

  63.     0xe0, 0x0f, 0x57, 0xb8, 0xe7, 0x08, 0x50, 0xbf, 0xee, 0x01, 0x59, 0xb6, 0xe9, 0x06, 0x5e, 0xb1,

  64.     0xfc, 0x13, 0x4b, 0xa4, 0xfb, 0x14, 0x4c, 0xa3, 0xf2, 0x1d, 0x45, 0xaa, 0xf5, 0x1a, 0x42, 0xad,

  65.     0xd8, 0x37, 0x6f, 0x80, 0xdf, 0x30, 0x68, 0x87, 0xd6, 0x39, 0x61, 0x8e, 0xd1, 0x3e, 0x66, 0x89,

  66.     0xc4, 0x2b, 0x73, 0x9c, 0xc3, 0x2c, 0x74, 0x9b, 0xca, 0x25, 0x7d, 0x92, 0xcd, 0x22, 0x7a, 0x95,

  67.     0x90, 0x7f, 0x27, 0xc8, 0x97, 0x78, 0x20, 0xcf, 0x9e, 0x71, 0x29, 0xc6, 0x99, 0x76, 0x2e, 0xc1,

  68.     0x8c, 0x63, 0x3b, 0xd4, 0x8b, 0x64, 0x3c, 0xd3, 0x82, 0x6d, 0x35, 0xda, 0x85, 0x6a, 0x32, 0xdd,

  69.     0xa8, 0x47, 0x1f, 0xf0, 0xaf, 0x40, 0x18, 0xf7, 0xa6, 0x49, 0x11, 0xfe, 0xa1, 0x4e, 0x16, 0xf9,

  70.     0xb4, 0x5b, 0x03, 0xec, 0xb3, 0x5c, 0x04, 0xeb, 0xba, 0x55, 0x0d, 0xe2, 0xbd, 0x52, 0x0a, 0xe5

  71. };

  72. 

  73. static const uint8_t q0[256] = {

  74.     0xa9, 0x67, 0xb3, 0xe8, 0x04, 0xfd, 0xa3, 0x76, 0x9a, 0x92, 0x80, 0x78, 0xe4, 0xdd, 0xd1, 0x38,

  75.     0x0d, 0xc6, 0x35, 0x98, 0x18, 0xf7, 0xec, 0x6c, 0x43, 0x75, 0x37, 0x26, 0xfa, 0x13, 0x94, 0x48,

  76.     0xf2, 0xd0, 0x8b, 0x30, 0x84, 0x54, 0xdf, 0x23, 0x19, 0x5b, 0x3d, 0x59, 0xf3, 0xae, 0xa2, 0x82,

  77.     0x63, 0x01, 0x83, 0x2e, 0xd9, 0x51, 0x9b, 0x7c, 0xa6, 0xeb, 0xa5, 0xbe, 0x16, 0x0c, 0xe3, 0x61,

  78.     0xc0, 0x8c, 0x3a, 0xf5, 0x73, 0x2c, 0x25, 0x0b, 0xbb, 0x4e, 0x89, 0x6b, 0x53, 0x6a, 0xb4, 0xf1,

  79.     0xe1, 0xe6, 0xbd, 0x45, 0xe2, 0xf4, 0xb6, 0x66, 0xcc, 0x95, 0x03, 0x56, 0xd4, 0x1c, 0x1e, 0xd7,

  80.     0xfb, 0xc3, 0x8e, 0xb5, 0xe9, 0xcf, 0xbf, 0xba, 0xea, 0x77, 0x39, 0xaf, 0x33, 0xc9, 0x62, 0x71,

  81.     0x81, 0x79, 0x09, 0xad, 0x24, 0xcd, 0xf9, 0xd8, 0xe5, 0xc5, 0xb9, 0x4d, 0x44, 0x08, 0x86, 0xe7,

  82.     0xa1, 0x1d, 0xaa, 0xed, 0x06, 0x70, 0xb2, 0xd2, 0x41, 0x7b, 0xa0, 0x11, 0x31, 0xc2, 0x27, 0x90,

  83.     0x20, 0xf6, 0x60, 0xff, 0x96, 0x5c, 0xb1, 0xab, 0x9e, 0x9c, 0x52, 0x1b, 0x5f, 0x93, 0x0a, 0xef,

  84.     0x91, 0x85, 0x49, 0xee, 0x2d, 0x4f, 0x8f, 0x3b, 0x47, 0x87, 0x6d, 0x46, 0xd6, 0x3e, 0x69, 0x64,

  85.     0x2a, 0xce, 0xcb, 0x2f, 0xfc, 0x97, 0x05, 0x7a, 0xac, 0x7f, 0xd5, 0x1a, 0x4b, 0x0e, 0xa7, 0x5a,

  86.     0x28, 0x14, 0x3f, 0x29, 0x88, 0x3c, 0x4c, 0x02, 0xb8, 0xda, 0xb0, 0x17, 0x55, 0x1f, 0x8a, 0x7d,

  87.     0x57, 0xc7, 0x8d, 0x74, 0xb7, 0xc4, 0x9f, 0x72, 0x7e, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,

  88.     0x6e, 0x50, 0xde, 0x68, 0x65, 0xbc, 0xdb, 0xf8, 0xc8, 0xa8, 0x2b, 0x40, 0xdc, 0xfe, 0x32, 0xa4,

  89.     0xca, 0x10, 0x21, 0xf0, 0xd3, 0x5d, 0x0f, 0x00, 0x6f, 0x9d, 0x36, 0x42, 0x4a, 0x5e, 0xc1, 0xe0

  90. };

  91. 

  92. static const uint8_t q1[256] = {

  93.     0x75, 0xf3, 0xc6, 0xf4, 0xdb, 0x7b, 0xfb, 0xc8, 0x4a, 0xd3, 0xe6, 0x6b, 0x45, 0x7d, 0xe8, 0x4b,

  94.     0xd6, 0x32, 0xd8, 0xfd, 0x37, 0x71, 0xf1, 0xe1, 0x30, 0x0f, 0xf8, 0x1b, 0x87, 0xfa, 0x06, 0x3f,

  95.     0x5e, 0xba, 0xae, 0x5b, 0x8a, 0x00, 0xbc, 0x9d, 0x6d, 0xc1, 0xb1, 0x0e, 0x80, 0x5d, 0xd2, 0xd5,

  96.     0xa0, 0x84, 0x07, 0x14, 0xb5, 0x90, 0x2c, 0xa3, 0xb2, 0x73, 0x4c, 0x54, 0x92, 0x74, 0x36, 0x51,

  97.     0x38, 0xb0, 0xbd, 0x5a, 0xfc, 0x60, 0x62, 0x96, 0x6c, 0x42, 0xf7, 0x10, 0x7c, 0x28, 0x27, 0x8c,

  98.     0x13, 0x95, 0x9c, 0xc7, 0x24, 0x46, 0x3b, 0x70, 0xca, 0xe3, 0x85, 0xcb, 0x11, 0xd0, 0x93, 0xb8,

  99.     0xa6, 0x83, 0x20, 0xff, 0x9f, 0x77, 0xc3, 0xcc, 0x03, 0x6f, 0x08, 0xbf, 0x40, 0xe7, 0x2b, 0xe2,

  100.     0x79, 0x0c, 0xaa, 0x82, 0x41, 0x3a, 0xea, 0xb9, 0xe4, 0x9a, 0xa4, 0x97, 0x7e, 0xda, 0x7a, 0x17,

  101.     0x66, 0x94, 0xa1, 0x1d, 0x3d, 0xf0, 0xde, 0xb3, 0x0b, 0x72, 0xa7, 0x1c, 0xef, 0xd1, 0x53, 0x3e,

  102.     0x8f, 0x33, 0x26, 0x5f, 0xec, 0x76, 0x2a, 0x49, 0x81, 0x88, 0xee, 0x21, 0xc4, 0x1a, 0xeb, 0xd9,

  103.     0xc5, 0x39, 0x99, 0xcd, 0xad, 0x31, 0x8b, 0x01, 0x18, 0x23, 0xdd, 0x1f, 0x4e, 0x2d, 0xf9, 0x48,

  104.     0x4f, 0xf2, 0x65, 0x8e, 0x78, 0x5c, 0x58, 0x19, 0x8d, 0xe5, 0x98, 0x57, 0x67, 0x7f, 0x05, 0x64,

  105.     0xaf, 0x63, 0xb6, 0xfe, 0xf5, 0xb7, 0x3c, 0xa5, 0xce, 0xe9, 0x68, 0x44, 0xe0, 0x4d, 0x43, 0x69,

  106.     0x29, 0x2e, 0xac, 0x15, 0x59, 0xa8, 0x0a, 0x9e, 0x6e, 0x47, 0xdf, 0x34, 0x35, 0x6a, 0xcf, 0xdc,

  107.     0x22, 0xc9, 0xc0, 0x9b, 0x89, 0xd4, 0xed, 0xab, 0x12, 0xa2, 0x0d, 0x52, 0xbb, 0x02, 0x2f, 0xa9,

  108.     0xd7, 0x61, 0x1e, 0xb4, 0x50, 0x04, 0xf6, 0xc2, 0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xbe, 0x91

  109. };

  110. 

  111. struct AVTWOFISH *av_twofish_alloc(void)

  112. {

  113.     return av_mallocz(sizeof(struct AVTWOFISH));

  114. }

  115. 

  116. const int av_twofish_size = sizeof(AVTWOFISH);

  117. 

  118. static uint8_t gfmul(uint8_t a, uint8_t b)

  119. {

  120.     uint8_t r = 0, t;

  121.     while (a && b) {

  122.         if (a & 1)

  123.             r = r ^ b;

  124.         t = b & 0x80;

  125.         b = b << 1;

  126.         if (t)

  127.             b = b ^ 0x4d;

  128.         a = a >> 1;

  129.     }

  130.     return r;

  131. }

  132. 

  133. static uint32_t tf_RS(uint32_t k0, uint32_t k1)

  134. {

  135.     uint8_t s[4], m[8];

  136.     AV_WL32(m, k0);

  137.     AV_WL32(m + 4, k1);

  138.     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]);

  139.     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]);

  140.     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]);

  141.     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]);

  142.     return AV_RL32(s);

  143. }

  144. 

  145. static uint32_t tf_h(uint32_t X, uint32_t L[4], int k)

  146. {

  147.     uint8_t y[4], l[4];

  148.     AV_WL32(y, X);

  149.     if (k == 4) {

  150.         AV_WL32(l, L[3]);

  151.         y[0] = q1[y[0]] ^ l[0];

  152.         y[1] = q0[y[1]] ^ l[1];

  153.         y[2] = q0[y[2]] ^ l[2];

  154.         y[3] = q1[y[3]] ^ l[3];

  155.     }

  156.     if (k >= 3) {

  157.         AV_WL32(l, L[2]);

  158.         y[0] = q1[y[0]] ^ l[0];

  159.         y[1] = q1[y[1]] ^ l[1];

  160.         y[2] = q0[y[2]] ^ l[2];

  161.         y[3] = q0[y[3]] ^ l[3];

  162.     }

  163.     AV_WL32(l, L[1]);

  164.     y[0] = q1[q0[q0[y[0]] ^ l[0]] ^ (L[0] & 0xff)];

  165.     y[1] = q0[q0[q1[y[1]] ^ l[1]] ^ ((L[0] >> 8) & 0xff)];

  166.     y[2] = q1[q1[q0[y[2]] ^ l[2]] ^ ((L[0] >> 16) & 0xff)];

  167.     y[3] = q0[q1[q1[y[3]] ^ l[3]] ^ (L[0] >> 24)];

  168. 

  169.     l[0] = y[0] ^ MD2[y[1]] ^ MD1[y[2]] ^ MD1[y[3]];

  170.     l[1] = MD1[y[0]] ^ MD2[y[1]] ^ MD2[y[2]] ^ y[3];

  171.     l[2] = MD2[y[0]] ^ MD1[y[1]] ^ y[2] ^ MD2[y[3]];

  172.     l[3] = MD2[y[0]] ^ y[1] ^ MD2[y[2]] ^ MD1[y[3]];

  173. 

  174.     return AV_RL32(l);

  175. }

  176. 

  177. static void twofish_encrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src)

  178. {

  179.     uint32_t P[4], t0, t1;

  180.     int i;

  181.     P[0] = AV_RL32(src) ^ cs->K[0];

  182.     P[1] = AV_RL32(src + 4) ^ cs->K[1];

  183.     P[2] = AV_RL32(src + 8) ^ cs->K[2];

  184.     P[3] = AV_RL32(src + 12) ^ cs->K[3];

  185.     for (i = 0; i < 16; i += 2) {

  186.         t0 = tf_h(P[0], cs->S, cs->ksize);

  187.         t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize);

  188.         P[2] = RR(P[2] ^ (t0 + t1 + cs->K[2 * i + 8]), 1);

  189.         P[3] = LR(P[3], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 9]);

  190.         t0 = tf_h(P[2], cs->S, cs->ksize);

  191.         t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize);

  192.         P[0] = RR(P[0] ^ (t0 + t1 + cs->K[2 * i + 10]), 1);

  193.         P[1] = LR(P[1], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 11]);

  194.     }

  195.     P[2] ^= cs->K[4];

  196.     P[3] ^= cs->K[5];

  197.     P[0] ^= cs->K[6];

  198.     P[1] ^= cs->K[7];

  199.     AV_WL32(dst, P[2]);

  200.     AV_WL32(dst + 4, P[3]);

  201.     AV_WL32(dst + 8, P[0]);

  202.     AV_WL32(dst + 12, P[1]);

  203. }

  204. 

  205. static void twofish_decrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, uint8_t *iv)

  206. {

  207.     uint32_t P[4], t0, t1;

  208.     int i;

  209.     P[2] = AV_RL32(src) ^ cs->K[4];

  210.     P[3] = AV_RL32(src + 4) ^ cs->K[5];

  211.     P[0] = AV_RL32(src + 8) ^ cs->K[6];

  212.     P[1] = AV_RL32(src + 12) ^ cs->K[7];

  213.     for (i = 15; i >= 0; i -= 2) {

  214.         t0 = tf_h(P[2], cs->S, cs->ksize);

  215.         t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize);

  216.         P[0] = LR(P[0], 1) ^ (t0 + t1 + cs->K[2 * i + 8]);

  217.         P[1] = RR(P[1] ^ (t0 + 2 * t1 + cs->K[2 * i + 9]), 1);

  218.         t0 = tf_h(P[0], cs->S, cs->ksize);

  219.         t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize);

  220.         P[2] = LR(P[2], 1) ^ (t0 + t1 + cs->K[2 * i + 6]);

  221.         P[3] = RR(P[3] ^ (t0 + 2 * t1 + cs->K[2 * i + 7]), 1);

  222.     }

  223.     P[0] ^= cs->K[0];

  224.     P[1] ^= cs->K[1];

  225.     P[2] ^= cs->K[2];

  226.     P[3] ^= cs->K[3];

  227.     if (iv) {

  228.         P[0] ^= AV_RL32(iv);

  229.         P[1] ^= AV_RL32(iv + 4);

  230.         P[2] ^= AV_RL32(iv + 8);

  231.         P[3] ^= AV_RL32(iv + 12);

  232.         memcpy(iv, src, 16);

  233.     }

  234.     AV_WL32(dst, P[2]);

  235.     AV_WL32(dst + 4, P[3]);

  236.     AV_WL32(dst + 8, P[0]);

  237.     AV_WL32(dst + 12, P[1]);

  238. }

  239. 

  240. av_cold int av_twofish_init(AVTWOFISH *cs, const uint8_t *key, int key_bits)

  241. {

  242.     int i;

  243.     uint8_t keypad[32];

  244.     uint32_t Key[8], Me[4], Mo[4], A, B;

  245.     const uint32_t rho = 0x01010101;

  246.     if (key_bits < 0)

  247.         return -1;

  248.     if (key_bits <= 128) {

  249.         cs->ksize = 2;

  250.     } else if (key_bits <= 192) {

  251.         cs->ksize = 3;

  252.     } else {

  253.         cs->ksize = 4;

  254.     }

  255.     memset(keypad, 0, sizeof(keypad));

  256.     if (key_bits <= 256) {

  257.         memcpy(keypad, key, key_bits >> 3);

  258.     } else {

  259.         memcpy(keypad, key, 32);

  260.     }

  261.     for (i = 0; i < 2 * cs->ksize ; i++)

  262.         Key[i] = AV_RL32(keypad + 4 * i);

  263.     for (i = 0; i < cs->ksize; i++) {

  264.         Me[i] = Key[2 * i];

  265.         Mo[i] = Key[2 * i + 1];

  266.         cs->S[cs->ksize - i - 1] = tf_RS(Me[i], Mo[i]);

  267.     }

  268.     for (i = 0; i < 20; i++) {

  269.         A = tf_h((2 * i) * rho, Me, cs->ksize);

  270.         B = tf_h((2 * i + 1) * rho, Mo, cs->ksize);

  271.         B = LR(B, 8);

  272.         cs->K[2 * i] = A + B;

  273.         cs->K[2 * i + 1] = LR((A + (2 * B)), 9);

  274.     }

  275.     if (cs->ksize << 6 != key_bits) {

  276.         return 1;

  277.     } else {

  278.         return 0;

  279.     }

  280. }

  281. 

  282. void av_twofish_crypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)

  283. {

  284.     int i;

  285.     while (count--) {

  286.         if (decrypt) {

  287.             twofish_decrypt(cs, dst, src, iv);

  288.         } else {

  289.             if (iv) {

  290.                 for (i = 0; i < 16; i++)

  291.                     dst[i] = src[i] ^ iv[i];

  292.                 twofish_encrypt(cs, dst, dst);

  293.                 memcpy(iv, dst, 16);

  294.             } else {

  295.                 twofish_encrypt(cs, dst, src);

  296.             }

  297.         }

  298.         src = src + 16;

  299.         dst = dst + 16;

  300.     }

  301. }

  302. 

  303. #ifdef TEST

  304. #include<stdio.h>

  305. #include<stdlib.h>

  306. #include"log.h"

  307. 

  308. int main(int argc, char *argv[])

  309. {

  310.     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

  311.     };

  312.     const uint8_t rct[6][16] = {

  313.         {0x9f, 0x58, 0x9f, 0x5c, 0xf6, 0x12, 0x2c, 0x32, 0xb6, 0xbf, 0xec, 0x2f, 0x2a, 0xe8, 0xc3, 0x5a},

  314.         {0xcf, 0xd1, 0xd2, 0xe5, 0xa9, 0xbe, 0x9c, 0xdf, 0x50, 0x1f, 0x13, 0xb8, 0x92, 0xbd, 0x22, 0x48},

  315.         {0x37, 0x52, 0x7b, 0xe0, 0x05, 0x23, 0x34, 0xb8, 0x9f, 0x0c, 0xfc, 0xca, 0xe8, 0x7c, 0xfa, 0x20},

  316.         {0x5d, 0x9d, 0x4e, 0xef, 0xfa, 0x91, 0x51, 0x57, 0x55, 0x24, 0xf1, 0x15, 0x81, 0x5a, 0x12, 0xe0},

  317.         {0xe7, 0x54, 0x49, 0x21, 0x2b, 0xee, 0xf9, 0xf4, 0xa3, 0x90, 0xbd, 0x86, 0x0a, 0x64, 0x09, 0x41},

  318.         {0x37, 0xfe, 0x26, 0xff, 0x1c, 0xf6, 0x61, 0x75, 0xf5, 0xdd, 0xf4, 0xc3, 0x3b, 0x97, 0xa2, 0x05}

  319.     };

  320.     uint8_t temp[32], iv[16], rpt[32] = {0};

  321.     const int kbits[3] = {128, 192, 256};

  322.     int i, j, err = 0;

  323.     AVTWOFISH *cs;

  324.     cs = av_twofish_alloc();

  325.     if (!cs)

  326.         return 1;

  327.     for (j = 1; j < 3; j++) {

  328.         av_twofish_init(cs, Key, kbits[j]);

  329.         av_twofish_crypt(cs, temp, rpt, 1, NULL, 0);

  330.         for (i = 0; i < 16; i++) {

  331.             if (rct[j][i] != temp[i]) {

  332.                 av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]);

  333.                 err = 1;

  334.             }

  335.         }

  336.         av_twofish_crypt(cs, temp, rct[j], 1, NULL, 1);

  337.         for (i = 0; i < 16; i++) {

  338.             if (rpt[i] != temp[i]) {

  339.                 av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]);

  340.                 err = 1;

  341.             }

  342.         }

  343.     }

  344.     for (j = 0; j < 3; j++) {

  345.         memset(Key, 0, sizeof(Key));

  346.         memset(rpt, 0, sizeof(rpt));

  347.         for (i = 1; i < 50; i++) {

  348.             av_twofish_init(cs, Key, kbits[j]);

  349.             av_twofish_crypt(cs, temp, rpt, 1, NULL, 0);

  350.             memcpy(Key+16,Key,(kbits[j]-128) >> 3);

  351.             memcpy(Key,rpt,16);

  352.             memcpy(rpt,temp,16);

  353.         }

  354.         for (i = 0; i < 16; i++) {

  355.             if (rct[3 + j][i] != temp[i]) {

  356.                 av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[3 + j][i], temp[i]);

  357.                 err = 1;

  358.             }

  359.         }

  360.     }

  361.     memset(rpt, 0, sizeof(rpt));

  362.     memcpy(iv, "HALLO123HALLO123", 16);

  363.     av_twofish_crypt(cs, temp, rpt, 2, iv, 0);

  364.     memcpy(iv, "HALLO123HALLO123", 16);

  365.     av_twofish_crypt(cs, temp, temp, 2, iv, 1);

  366.     for (i = 0; i < 32; i++) {

  367.         if (rpt[i] != temp[i]) {

  368.             av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]);

  369.             err = 1;

  370.         }

  371.     }

  372.     av_free(cs);

  373.     return err;

  374. }

  375. #endif