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hmac.c 3.1 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. * HMAC implementation - This code was originally taken from RFC2104
  32. */
  33. #include <string.h>
  34. #include "crypto.h"
  35. /**
  36. * Perform HMAC-MD5
  37. */
  38. void hmac_md5(const uint8_t *msg, int length, const uint8_t *key,
  39. int key_len, uint8_t *digest)
  40. {
  41. MD5_CTX context;
  42. uint8_t k_ipad[64];
  43. uint8_t k_opad[64];
  44. int i;
  45. memset(k_ipad, 0, sizeof k_ipad);
  46. memset(k_opad, 0, sizeof k_opad);
  47. memcpy(k_ipad, key, key_len);
  48. memcpy(k_opad, key, key_len);
  49. for (i = 0; i < 64; i++)
  50. {
  51. k_ipad[i] ^= 0x36;
  52. k_opad[i] ^= 0x5c;
  53. }
  54. MD5_Init(&context);
  55. MD5_Update(&context, k_ipad, 64);
  56. MD5_Update(&context, msg, length);
  57. MD5_Final(digest, &context);
  58. MD5_Init(&context);
  59. MD5_Update(&context, k_opad, 64);
  60. MD5_Update(&context, digest, MD5_SIZE);
  61. MD5_Final(digest, &context);
  62. }
  63. /**
  64. * Perform HMAC-SHA1
  65. */
  66. void hmac_sha1(const uint8_t *msg, int length, const uint8_t *key,
  67. int key_len, uint8_t *digest)
  68. {
  69. SHA1_CTX context;
  70. uint8_t k_ipad[64];
  71. uint8_t k_opad[64];
  72. int i;
  73. memset(k_ipad, 0, sizeof k_ipad);
  74. memset(k_opad, 0, sizeof k_opad);
  75. memcpy(k_ipad, key, key_len);
  76. memcpy(k_opad, key, key_len);
  77. for (i = 0; i < 64; i++)
  78. {
  79. k_ipad[i] ^= 0x36;
  80. k_opad[i] ^= 0x5c;
  81. }
  82. SHA1_Init(&context);
  83. SHA1_Update(&context, k_ipad, 64);
  84. SHA1_Update(&context, msg, length);
  85. SHA1_Final(digest, &context);
  86. SHA1_Init(&context);
  87. SHA1_Update(&context, k_opad, 64);
  88. SHA1_Update(&context, digest, SHA1_SIZE);
  89. SHA1_Final(digest, &context);
  90. }