MD2.c 4.1 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 <string.h>
  28. #include "Python.h"
  29. #include "pycrypto_compat.h"
  30. #define MODULE_NAME _MD2
  31. #define DIGEST_SIZE 16
  32. #define BLOCK_SIZE 64
  33. /**
  34. * id-md2 OBJECT IDENTIFIER ::= {
  35. * iso(1) member-body(2) us(840) rsadsi(113549)
  36. * digestAlgorithm(2) 2
  37. * }
  38. */
  39. static const char md2_oid[] = { 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x02 };
  40. #define DER_OID ((void*)&md2_oid)
  41. #define DER_OID_SIZE (sizeof md2_oid)
  42. typedef unsigned char U8;
  43. typedef unsigned int U32;
  44. typedef struct {
  45. U8 C[16], X[48];
  46. int count;
  47. U8 buf[16];
  48. } hash_state;
  49. static void hash_init (hash_state *ptr)
  50. {
  51. memset(ptr->X, 0, 48);
  52. memset(ptr->C, 0, 16);
  53. ptr->count=0;
  54. }
  55. static U8 S[256] = {
  56. 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
  57. 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
  58. 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
  59. 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
  60. 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
  61. 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
  62. 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
  63. 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
  64. 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
  65. 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
  66. 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
  67. 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
  68. 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
  69. 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
  70. 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
  71. 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
  72. 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
  73. 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
  74. };
  75. static void
  76. hash_copy(hash_state *src, hash_state *dest)
  77. {
  78. dest->count=src->count;
  79. memcpy(dest->buf, src->buf, dest->count);
  80. memcpy(dest->X, src->X, 48);
  81. memcpy(dest->C, src->C, 16);
  82. }
  83. static void hash_update (hash_state *self, const U8 *buf, U32 len)
  84. {
  85. U32 L;
  86. while (len)
  87. {
  88. L=(16-self->count) < len ? (16-self->count) : len;
  89. memcpy(self->buf+self->count, buf, L);
  90. self->count+=L;
  91. buf+=L;
  92. len-=L;
  93. if (self->count==16)
  94. {
  95. U8 t;
  96. int i,j;
  97. self->count=0;
  98. memcpy(self->X+16, self->buf, 16);
  99. t=self->C[15];
  100. for(i=0; i<16; i++)
  101. {
  102. self->X[32+i]=self->X[16+i]^self->X[i];
  103. t=self->C[i]^=S[self->buf[i]^t];
  104. }
  105. t=0;
  106. for(i=0; i<18; i++)
  107. {
  108. for(j=0; j<48; j++)
  109. t=self->X[j]^=S[t];
  110. t=(t+i) & 0xFF;
  111. }
  112. }
  113. }
  114. }
  115. static PyObject *
  116. hash_digest (const hash_state *self)
  117. {
  118. U8 padding[16];
  119. U32 padlen;
  120. hash_state temp;
  121. int i;
  122. memcpy(&temp, self, sizeof(hash_state));
  123. padlen= 16-self->count;
  124. for(i=0; i<padlen; i++) padding[i]=padlen;
  125. hash_update(&temp, padding, padlen);
  126. hash_update(&temp, temp.C, 16);
  127. return PyBytes_FromStringAndSize((char *) temp.X, 16);
  128. }
  129. #include "hash_template.c"