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fcrypt_b.c 5.2 KB

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  1. /* crypto/des/fcrypt_b.c */
  2. /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  3. * All rights reserved.
  4. *
  5. * This package is an SSL implementation written
  6. * by Eric Young (eay@cryptsoft.com).
  7. * The implementation was written so as to conform with Netscapes SSL.
  8. *
  9. * This library is free for commercial and non-commercial use as long as
  10. * the following conditions are aheared to. The following conditions
  11. * apply to all code found in this distribution, be it the RC4, RSA,
  12. * lhash, DES, etc., code; not just the SSL code. The SSL documentation
  13. * included with this distribution is covered by the same copyright terms
  14. * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15. *
  16. * Copyright remains Eric Young's, and as such any Copyright notices in
  17. * the code are not to be removed.
  18. * If this package is used in a product, Eric Young should be given attribution
  19. * as the author of the parts of the library used.
  20. * This can be in the form of a textual message at program startup or
  21. * in documentation (online or textual) provided with the package.
  22. *
  23. * Redistribution and use in source and binary forms, with or without
  24. * modification, are permitted provided that the following conditions
  25. * are met:
  26. * 1. Redistributions of source code must retain the copyright
  27. * notice, this list of conditions and the following disclaimer.
  28. * 2. Redistributions in binary form must reproduce the above copyright
  29. * notice, this list of conditions and the following disclaimer in the
  30. * documentation and/or other materials provided with the distribution.
  31. * 3. All advertising materials mentioning features or use of this software
  32. * must display the following acknowledgement:
  33. * "This product includes cryptographic software written by
  34. * Eric Young (eay@cryptsoft.com)"
  35. * The word 'cryptographic' can be left out if the rouines from the library
  36. * being used are not cryptographic related :-).
  37. * 4. If you include any Windows specific code (or a derivative thereof) from
  38. * the apps directory (application code) you must include an acknowledgement:
  39. * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40. *
  41. * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51. * SUCH DAMAGE.
  52. *
  53. * The licence and distribution terms for any publically available version or
  54. * derivative of this code cannot be changed. i.e. this code cannot simply be
  55. * copied and put under another distribution licence
  56. * [including the GNU Public Licence.]
  57. */
  58. #include <stdio.h>
  59. /*
  60. * This version of crypt has been developed from my MIT compatible DES
  61. * library. The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
  62. * Eric Young (eay@cryptsoft.com)
  63. */
  64. #define DES_FCRYPT
  65. #include "des_locl.h"
  66. #undef DES_FCRYPT
  67. #undef PERM_OP
  68. #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
  69. (b)^=(t),\
  70. (a)^=((t)<<(n)))
  71. #undef HPERM_OP
  72. #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
  73. (a)=(a)^(t)^(t>>(16-(n))))\
  74. void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
  75. DES_LONG Eswap1)
  76. {
  77. register DES_LONG l, r, t, u;
  78. #ifdef DES_PTR
  79. register const unsigned char *des_SP = (const unsigned char *)DES_SPtrans;
  80. #endif
  81. register DES_LONG *s;
  82. register int j;
  83. register DES_LONG E0, E1;
  84. l = 0;
  85. r = 0;
  86. s = (DES_LONG *)ks;
  87. E0 = Eswap0;
  88. E1 = Eswap1;
  89. for (j = 0; j < 25; j++) {
  90. #ifndef DES_UNROLL
  91. register int i;
  92. for (i = 0; i < 32; i += 4) {
  93. D_ENCRYPT(l, r, i + 0); /* 1 */
  94. D_ENCRYPT(r, l, i + 2); /* 2 */
  95. }
  96. #else
  97. D_ENCRYPT(l, r, 0); /* 1 */
  98. D_ENCRYPT(r, l, 2); /* 2 */
  99. D_ENCRYPT(l, r, 4); /* 3 */
  100. D_ENCRYPT(r, l, 6); /* 4 */
  101. D_ENCRYPT(l, r, 8); /* 5 */
  102. D_ENCRYPT(r, l, 10); /* 6 */
  103. D_ENCRYPT(l, r, 12); /* 7 */
  104. D_ENCRYPT(r, l, 14); /* 8 */
  105. D_ENCRYPT(l, r, 16); /* 9 */
  106. D_ENCRYPT(r, l, 18); /* 10 */
  107. D_ENCRYPT(l, r, 20); /* 11 */
  108. D_ENCRYPT(r, l, 22); /* 12 */
  109. D_ENCRYPT(l, r, 24); /* 13 */
  110. D_ENCRYPT(r, l, 26); /* 14 */
  111. D_ENCRYPT(l, r, 28); /* 15 */
  112. D_ENCRYPT(r, l, 30); /* 16 */
  113. #endif
  114. t = l;
  115. l = r;
  116. r = t;
  117. }
  118. l = ROTATE(l, 3) & 0xffffffffL;
  119. r = ROTATE(r, 3) & 0xffffffffL;
  120. PERM_OP(l, r, t, 1, 0x55555555L);
  121. PERM_OP(r, l, t, 8, 0x00ff00ffL);
  122. PERM_OP(l, r, t, 2, 0x33333333L);
  123. PERM_OP(r, l, t, 16, 0x0000ffffL);
  124. PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
  125. out[0] = r;
  126. out[1] = l;
  127. }