cbc_cksm.c 4.2 KB

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  1. /* crypto/des/cbc_cksm.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 "des_locl.h"
  59. DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output,
  60. long length, DES_key_schedule *schedule,
  61. const_DES_cblock *ivec)
  62. {
  63. register DES_LONG tout0,tout1,tin0,tin1;
  64. register long l=length;
  65. DES_LONG tin[2];
  66. unsigned char *out = &(*output)[0];
  67. const unsigned char *iv = &(*ivec)[0];
  68. c2l(iv,tout0);
  69. c2l(iv,tout1);
  70. for (; l>0; l-=8)
  71. {
  72. if (l >= 8)
  73. {
  74. c2l(in,tin0);
  75. c2l(in,tin1);
  76. }
  77. else
  78. c2ln(in,tin0,tin1,l);
  79. tin0^=tout0; tin[0]=tin0;
  80. tin1^=tout1; tin[1]=tin1;
  81. DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
  82. /* fix 15/10/91 eay - thanks to keithr@sco.COM */
  83. tout0=tin[0];
  84. tout1=tin[1];
  85. }
  86. if (out != NULL)
  87. {
  88. l2c(tout0,out);
  89. l2c(tout1,out);
  90. }
  91. tout0=tin0=tin1=tin[0]=tin[1]=0;
  92. /*
  93. Transform the data in tout1 so that it will
  94. match the return value that the MIT Kerberos
  95. mit_des_cbc_cksum API returns.
  96. */
  97. tout1 = ((tout1 >> 24L) & 0x000000FF)
  98. | ((tout1 >> 8L) & 0x0000FF00)
  99. | ((tout1 << 8L) & 0x00FF0000)
  100. | ((tout1 << 24L) & 0xFF000000);
  101. return(tout1);
  102. }