str2key.c 5.5 KB

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  1. /* crypto/des/str2key.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. #include <openssl/crypto.h>
  60. void DES_string_to_key(const char *str, DES_cblock *key)
  61. {
  62. DES_key_schedule ks;
  63. int i,length;
  64. register unsigned char j;
  65. memset(key,0,8);
  66. length=strlen(str);
  67. #ifdef OLD_STR_TO_KEY
  68. for (i=0; i<length; i++)
  69. (*key)[i%8]^=(str[i]<<1);
  70. #else /* MIT COMPATIBLE */
  71. for (i=0; i<length; i++)
  72. {
  73. j=str[i];
  74. if ((i%16) < 8)
  75. (*key)[i%8]^=(j<<1);
  76. else
  77. {
  78. /* Reverse the bit order 05/05/92 eay */
  79. j=((j<<4)&0xf0)|((j>>4)&0x0f);
  80. j=((j<<2)&0xcc)|((j>>2)&0x33);
  81. j=((j<<1)&0xaa)|((j>>1)&0x55);
  82. (*key)[7-(i%8)]^=j;
  83. }
  84. }
  85. #endif
  86. DES_set_odd_parity(key);
  87. #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
  88. if(DES_is_weak_key(key))
  89. (*key)[7] ^= 0xF0;
  90. DES_set_key(key,&ks);
  91. #else
  92. DES_set_key_unchecked(key,&ks);
  93. #endif
  94. DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key);
  95. OPENSSL_cleanse(&ks,sizeof(ks));
  96. DES_set_odd_parity(key);
  97. }
  98. void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
  99. {
  100. DES_key_schedule ks;
  101. int i,length;
  102. register unsigned char j;
  103. memset(key1,0,8);
  104. memset(key2,0,8);
  105. length=strlen(str);
  106. #ifdef OLD_STR_TO_KEY
  107. if (length <= 8)
  108. {
  109. for (i=0; i<length; i++)
  110. {
  111. (*key2)[i]=(*key1)[i]=(str[i]<<1);
  112. }
  113. }
  114. else
  115. {
  116. for (i=0; i<length; i++)
  117. {
  118. if ((i/8)&1)
  119. (*key2)[i%8]^=(str[i]<<1);
  120. else
  121. (*key1)[i%8]^=(str[i]<<1);
  122. }
  123. }
  124. #else /* MIT COMPATIBLE */
  125. for (i=0; i<length; i++)
  126. {
  127. j=str[i];
  128. if ((i%32) < 16)
  129. {
  130. if ((i%16) < 8)
  131. (*key1)[i%8]^=(j<<1);
  132. else
  133. (*key2)[i%8]^=(j<<1);
  134. }
  135. else
  136. {
  137. j=((j<<4)&0xf0)|((j>>4)&0x0f);
  138. j=((j<<2)&0xcc)|((j>>2)&0x33);
  139. j=((j<<1)&0xaa)|((j>>1)&0x55);
  140. if ((i%16) < 8)
  141. (*key1)[7-(i%8)]^=j;
  142. else
  143. (*key2)[7-(i%8)]^=j;
  144. }
  145. }
  146. if (length <= 8) memcpy(key2,key1,8);
  147. #endif
  148. DES_set_odd_parity(key1);
  149. DES_set_odd_parity(key2);
  150. #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
  151. if(DES_is_weak_key(key1))
  152. (*key1)[7] ^= 0xF0;
  153. DES_set_key(key1,&ks);
  154. #else
  155. DES_set_key_unchecked(key1,&ks);
  156. #endif
  157. DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1);
  158. #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
  159. if(DES_is_weak_key(key2))
  160. (*key2)[7] ^= 0xF0;
  161. DES_set_key(key2,&ks);
  162. #else
  163. DES_set_key_unchecked(key2,&ks);
  164. #endif
  165. DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2);
  166. OPENSSL_cleanse(&ks,sizeof(ks));
  167. DES_set_odd_parity(key1);
  168. DES_set_odd_parity(key2);
  169. }