ncbc_enc.c 5.1 KB

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  1. /* crypto/des/ncbc_enc.c */
  2. /*
  3. * #included by:
  4. * cbc_enc.c (DES_cbc_encrypt)
  5. * des_enc.c (DES_ncbc_encrypt)
  6. */
  7. /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  8. * All rights reserved.
  9. *
  10. * This package is an SSL implementation written
  11. * by Eric Young (eay@cryptsoft.com).
  12. * The implementation was written so as to conform with Netscapes SSL.
  13. *
  14. * This library is free for commercial and non-commercial use as long as
  15. * the following conditions are aheared to. The following conditions
  16. * apply to all code found in this distribution, be it the RC4, RSA,
  17. * lhash, DES, etc., code; not just the SSL code. The SSL documentation
  18. * included with this distribution is covered by the same copyright terms
  19. * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  20. *
  21. * Copyright remains Eric Young's, and as such any Copyright notices in
  22. * the code are not to be removed.
  23. * If this package is used in a product, Eric Young should be given attribution
  24. * as the author of the parts of the library used.
  25. * This can be in the form of a textual message at program startup or
  26. * in documentation (online or textual) provided with the package.
  27. *
  28. * Redistribution and use in source and binary forms, with or without
  29. * modification, are permitted provided that the following conditions
  30. * are met:
  31. * 1. Redistributions of source code must retain the copyright
  32. * notice, this list of conditions and the following disclaimer.
  33. * 2. Redistributions in binary form must reproduce the above copyright
  34. * notice, this list of conditions and the following disclaimer in the
  35. * documentation and/or other materials provided with the distribution.
  36. * 3. All advertising materials mentioning features or use of this software
  37. * must display the following acknowledgement:
  38. * "This product includes cryptographic software written by
  39. * Eric Young (eay@cryptsoft.com)"
  40. * The word 'cryptographic' can be left out if the rouines from the library
  41. * being used are not cryptographic related :-).
  42. * 4. If you include any Windows specific code (or a derivative thereof) from
  43. * the apps directory (application code) you must include an acknowledgement:
  44. * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  45. *
  46. * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  47. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  50. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56. * SUCH DAMAGE.
  57. *
  58. * The licence and distribution terms for any publically available version or
  59. * derivative of this code cannot be changed. i.e. this code cannot simply be
  60. * copied and put under another distribution licence
  61. * [including the GNU Public Licence.]
  62. */
  63. #include "des_locl.h"
  64. #ifdef CBC_ENC_C__DONT_UPDATE_IV
  65. void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  66. DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
  67. #else
  68. void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  69. DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
  70. #endif
  71. {
  72. register DES_LONG tin0,tin1;
  73. register DES_LONG tout0,tout1,xor0,xor1;
  74. register long l=length;
  75. DES_LONG tin[2];
  76. unsigned char *iv;
  77. iv = &(*ivec)[0];
  78. if (enc)
  79. {
  80. c2l(iv,tout0);
  81. c2l(iv,tout1);
  82. for (l-=8; l>=0; l-=8)
  83. {
  84. c2l(in,tin0);
  85. c2l(in,tin1);
  86. tin0^=tout0; tin[0]=tin0;
  87. tin1^=tout1; tin[1]=tin1;
  88. DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
  89. tout0=tin[0]; l2c(tout0,out);
  90. tout1=tin[1]; l2c(tout1,out);
  91. }
  92. if (l != -8)
  93. {
  94. c2ln(in,tin0,tin1,l+8);
  95. tin0^=tout0; tin[0]=tin0;
  96. tin1^=tout1; tin[1]=tin1;
  97. DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
  98. tout0=tin[0]; l2c(tout0,out);
  99. tout1=tin[1]; l2c(tout1,out);
  100. }
  101. #ifndef CBC_ENC_C__DONT_UPDATE_IV
  102. iv = &(*ivec)[0];
  103. l2c(tout0,iv);
  104. l2c(tout1,iv);
  105. #endif
  106. }
  107. else
  108. {
  109. c2l(iv,xor0);
  110. c2l(iv,xor1);
  111. for (l-=8; l>=0; l-=8)
  112. {
  113. c2l(in,tin0); tin[0]=tin0;
  114. c2l(in,tin1); tin[1]=tin1;
  115. DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
  116. tout0=tin[0]^xor0;
  117. tout1=tin[1]^xor1;
  118. l2c(tout0,out);
  119. l2c(tout1,out);
  120. xor0=tin0;
  121. xor1=tin1;
  122. }
  123. if (l != -8)
  124. {
  125. c2l(in,tin0); tin[0]=tin0;
  126. c2l(in,tin1); tin[1]=tin1;
  127. DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
  128. tout0=tin[0]^xor0;
  129. tout1=tin[1]^xor1;
  130. l2cn(tout0,tout1,out,l+8);
  131. #ifndef CBC_ENC_C__DONT_UPDATE_IV
  132. xor0=tin0;
  133. xor1=tin1;
  134. #endif
  135. }
  136. #ifndef CBC_ENC_C__DONT_UPDATE_IV
  137. iv = &(*ivec)[0];
  138. l2c(xor0,iv);
  139. l2c(xor1,iv);
  140. #endif
  141. }
  142. tin0=tin1=tout0=tout1=xor0=xor1=0;
  143. tin[0]=tin[1]=0;
  144. }