MD2.c 4.0 KB

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  1. /*
  2. * md2.c : MD2 hash algorithm.
  3. *
  4. * Part of the Python Cryptography Toolkit
  5. *
  6. * Originally written by: A.M. Kuchling
  7. *
  8. * ===================================================================
  9. * The contents of this file are dedicated to the public domain. To
  10. * the extent that dedication to the public domain is not available,
  11. * everyone is granted a worldwide, perpetual, royalty-free,
  12. * non-exclusive license to exercise all rights associated with the
  13. * contents of this file for any purpose whatsoever.
  14. * No rights are reserved.
  15. *
  16. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18. * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19. * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  20. * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  21. * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22. * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23. * SOFTWARE.
  24. * ===================================================================
  25. *
  26. */
  27. #include "pycrypto_common.h"
  28. FAKE_INIT(MD2)
  29. typedef struct {
  30. uint8_t C[16], X[48];
  31. size_t count;
  32. uint8_t buf[16];
  33. } hash_state;
  34. EXPORT_SYM int md2_init(hash_state **md2State)
  35. {
  36. hash_state *hs;
  37. if (NULL == md2State) {
  38. return ERR_NULL;
  39. }
  40. *md2State = hs = (hash_state*) calloc(1, sizeof(hash_state));
  41. if (NULL == hs)
  42. return ERR_MEMORY;
  43. return 0;
  44. }
  45. EXPORT_SYM int md2_destroy(hash_state *hs)
  46. {
  47. free(hs);
  48. return 0;
  49. }
  50. static const uint8_t S[256] = {
  51. 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
  52. 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
  53. 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
  54. 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
  55. 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
  56. 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
  57. 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
  58. 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
  59. 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
  60. 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
  61. 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
  62. 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
  63. 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
  64. 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
  65. 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
  66. 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
  67. 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
  68. 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
  69. };
  70. EXPORT_SYM int md2_copy(const hash_state *src, hash_state *dst)
  71. {
  72. if (NULL == src || NULL == dst) {
  73. return ERR_NULL;
  74. }
  75. *dst = *src;
  76. return 0;
  77. }
  78. EXPORT_SYM int md2_update(hash_state *hs, const uint8_t *buf, size_t len)
  79. {
  80. uint32_t L;
  81. if (NULL == hs || NULL == buf)
  82. return ERR_NULL;
  83. while (len)
  84. {
  85. L=(16-hs->count) < len ? (16-hs->count) : len;
  86. memcpy(hs->buf+hs->count, buf, L);
  87. hs->count+=L;
  88. buf+=L;
  89. len-=L;
  90. if (hs->count==16)
  91. {
  92. uint8_t t;
  93. int i,j;
  94. hs->count=0;
  95. memcpy(hs->X+16, hs->buf, 16);
  96. t=hs->C[15];
  97. for(i=0; i<16; i++)
  98. {
  99. hs->X[32+i]=hs->X[16+i]^hs->X[i];
  100. t=hs->C[i]^=S[hs->buf[i]^t];
  101. }
  102. t=0;
  103. for(i=0; i<18; i++)
  104. {
  105. for(j=0; j<48; j++)
  106. t=hs->X[j]^=S[t];
  107. t=(t+i) & 0xFF;
  108. }
  109. }
  110. }
  111. return 0;
  112. }
  113. EXPORT_SYM int md2_digest(const hash_state *hs, uint8_t digest[16])
  114. {
  115. uint8_t padding[16];
  116. uint32_t padlen;
  117. hash_state temp;
  118. unsigned int i;
  119. if (NULL==hs || digest==NULL)
  120. return ERR_NULL;
  121. temp = *hs;
  122. padlen= 16-hs->count;
  123. for(i=0; i<padlen; i++) padding[i]=padlen;
  124. md2_update(&temp, padding, padlen);
  125. md2_update(&temp, temp.C, 16);
  126. memcpy(digest, temp.X, 16);
  127. return 0;
  128. }