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md2.c 5.0 KB

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  1. /*
  2. * Copyright (c) 2007, Cameron Rich
  3. *
  4. * All rights reserved.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions are met:
  8. *
  9. * * Redistributions of source code must retain the above copyright notice,
  10. * this list of conditions and the following disclaimer.
  11. * * Redistributions in binary form must reproduce the above copyright notice,
  12. * this list of conditions and the following disclaimer in the documentation
  13. * and/or other materials provided with the distribution.
  14. * * Neither the name of the axTLS project nor the names of its contributors
  15. * may be used to endorse or promote products derived from this software
  16. * without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  22. * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  23. * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  24. * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  25. * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  26. * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27. * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. */
  30. /*
  31. * RFC 1115/1319 compliant MD2 implementation
  32. * The MD2 algorithm was designed by Ron Rivest in 1989.
  33. *
  34. * http://www.ietf.org/rfc/rfc1115.txt
  35. * http://www.ietf.org/rfc/rfc1319.txt
  36. */
  37. #include <string.h>
  38. #include <stdio.h>
  39. #include "crypto.h"
  40. /**
  41. * This code is only here to enable the verification of Verisign root
  42. * certificates. So only enable it for verification mode.
  43. */
  44. #ifdef CONFIG_SSL_CERT_VERIFICATION
  45. static const uint8_t PI_SUBST[256] =
  46. {
  47. 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
  48. 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
  49. 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
  50. 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
  51. 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
  52. 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
  53. 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
  54. 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
  55. 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
  56. 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
  57. 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
  58. 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
  59. 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
  60. 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
  61. 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
  62. 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
  63. 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
  64. 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
  65. 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
  66. 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
  67. 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
  68. 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
  69. 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
  70. 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
  71. 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
  72. 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
  73. };
  74. /*
  75. * MD2 context setup
  76. */
  77. EXP_FUNC void STDCALL MD2_Init(MD2_CTX *ctx)
  78. {
  79. memset(ctx, 0, sizeof *ctx);
  80. }
  81. static void md2_process(MD2_CTX *ctx)
  82. {
  83. int i, j;
  84. uint8_t t = 0;
  85. for (i = 0; i < 16; i++)
  86. {
  87. ctx->state[i + 16] = ctx->buffer[i];
  88. ctx->state[i + 32] = ctx->buffer[i] ^ ctx->state[i];
  89. }
  90. for (i = 0; i < 18; i++)
  91. {
  92. for (j = 0; j < 48; j++)
  93. t = (ctx->state[j] ^= PI_SUBST[t]);
  94. t = (t + i) & 0xFF;
  95. }
  96. t = ctx->cksum[15];
  97. for (i = 0; i < 16; i++)
  98. t = (ctx->cksum[i] ^= PI_SUBST[ctx->buffer[i] ^ t]);
  99. }
  100. /*
  101. * MD2 process buffer
  102. */
  103. EXP_FUNC void STDCALL MD2_Update(MD2_CTX *ctx, const uint8_t *input, int ilen)
  104. {
  105. int fill;
  106. while (ilen > 0)
  107. {
  108. if (ctx->left + ilen > 16)
  109. fill = 16 - ctx->left;
  110. else
  111. fill = ilen;
  112. memcpy(ctx->buffer + ctx->left, input, fill);
  113. ctx->left += fill;
  114. input += fill;
  115. ilen -= fill;
  116. if (ctx->left == 16)
  117. {
  118. ctx->left = 0;
  119. md2_process(ctx);
  120. }
  121. }
  122. }
  123. /*
  124. * MD2 final digest
  125. */
  126. EXP_FUNC void STDCALL MD2_Final(uint8_t *output, MD2_CTX *ctx)
  127. {
  128. int i;
  129. uint8_t x;
  130. x = (uint8_t)(16 - ctx->left);
  131. for (i = ctx->left; i < 16; i++)
  132. ctx->buffer[i] = x;
  133. md2_process(ctx);
  134. memcpy(ctx->buffer, ctx->cksum, 16);
  135. md2_process(ctx);
  136. memcpy(output, ctx->state, 16);
  137. }
  138. #endif