cfb64ede.c 6.8 KB

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  1. /* crypto/des/cfb64ede.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 <openssl/crypto.h>
  59. #include "des_locl.h"
  60. #include "e_os.h"
  61. /* The input and output encrypted as though 64bit cfb mode is being
  62. * used. The extra state information to record how much of the
  63. * 64bit block we have used is contained in *num;
  64. */
  65. void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
  66. long length, DES_key_schedule *ks1,
  67. DES_key_schedule *ks2, DES_key_schedule *ks3,
  68. DES_cblock *ivec, int *num, int enc)
  69. {
  70. register DES_LONG v0,v1;
  71. register long l=length;
  72. register int n= *num;
  73. DES_LONG ti[2];
  74. unsigned char *iv,c,cc;
  75. iv=&(*ivec)[0];
  76. if (enc)
  77. {
  78. while (l--)
  79. {
  80. if (n == 0)
  81. {
  82. c2l(iv,v0);
  83. c2l(iv,v1);
  84. ti[0]=v0;
  85. ti[1]=v1;
  86. DES_encrypt3(ti,ks1,ks2,ks3);
  87. v0=ti[0];
  88. v1=ti[1];
  89. iv = &(*ivec)[0];
  90. l2c(v0,iv);
  91. l2c(v1,iv);
  92. iv = &(*ivec)[0];
  93. }
  94. c= *(in++)^iv[n];
  95. *(out++)=c;
  96. iv[n]=c;
  97. n=(n+1)&0x07;
  98. }
  99. }
  100. else
  101. {
  102. while (l--)
  103. {
  104. if (n == 0)
  105. {
  106. c2l(iv,v0);
  107. c2l(iv,v1);
  108. ti[0]=v0;
  109. ti[1]=v1;
  110. DES_encrypt3(ti,ks1,ks2,ks3);
  111. v0=ti[0];
  112. v1=ti[1];
  113. iv = &(*ivec)[0];
  114. l2c(v0,iv);
  115. l2c(v1,iv);
  116. iv = &(*ivec)[0];
  117. }
  118. cc= *(in++);
  119. c=iv[n];
  120. iv[n]=cc;
  121. *(out++)=c^cc;
  122. n=(n+1)&0x07;
  123. }
  124. }
  125. v0=v1=ti[0]=ti[1]=c=cc=0;
  126. *num=n;
  127. }
  128. #ifdef undef /* MACRO */
  129. void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
  130. DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
  131. int *num, int enc)
  132. {
  133. DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
  134. }
  135. #endif
  136. /* This is compatible with the single key CFB-r for DES, even thought that's
  137. * not what EVP needs.
  138. */
  139. void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out,
  140. int numbits,long length,DES_key_schedule *ks1,
  141. DES_key_schedule *ks2,DES_key_schedule *ks3,
  142. DES_cblock *ivec,int enc)
  143. {
  144. register DES_LONG d0,d1,v0,v1;
  145. register unsigned long l=length,n=((unsigned int)numbits+7)/8;
  146. register int num=numbits,i;
  147. DES_LONG ti[2];
  148. unsigned char *iv;
  149. unsigned char ovec[16];
  150. if (num > 64) return;
  151. iv = &(*ivec)[0];
  152. c2l(iv,v0);
  153. c2l(iv,v1);
  154. if (enc)
  155. {
  156. while (l >= n)
  157. {
  158. l-=n;
  159. ti[0]=v0;
  160. ti[1]=v1;
  161. DES_encrypt3(ti,ks1,ks2,ks3);
  162. c2ln(in,d0,d1,n);
  163. in+=n;
  164. d0^=ti[0];
  165. d1^=ti[1];
  166. l2cn(d0,d1,out,n);
  167. out+=n;
  168. /* 30-08-94 - eay - changed because l>>32 and
  169. * l<<32 are bad under gcc :-( */
  170. if (num == 32)
  171. { v0=v1; v1=d0; }
  172. else if (num == 64)
  173. { v0=d0; v1=d1; }
  174. else
  175. {
  176. iv=&ovec[0];
  177. l2c(v0,iv);
  178. l2c(v1,iv);
  179. l2c(d0,iv);
  180. l2c(d1,iv);
  181. /* shift ovec left most of the bits... */
  182. memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
  183. /* now the remaining bits */
  184. if(num%8 != 0)
  185. for(i=0 ; i < 8 ; ++i)
  186. {
  187. ovec[i]<<=num%8;
  188. ovec[i]|=ovec[i+1]>>(8-num%8);
  189. }
  190. iv=&ovec[0];
  191. c2l(iv,v0);
  192. c2l(iv,v1);
  193. }
  194. }
  195. }
  196. else
  197. {
  198. while (l >= n)
  199. {
  200. l-=n;
  201. ti[0]=v0;
  202. ti[1]=v1;
  203. DES_encrypt3(ti,ks1,ks2,ks3);
  204. c2ln(in,d0,d1,n);
  205. in+=n;
  206. /* 30-08-94 - eay - changed because l>>32 and
  207. * l<<32 are bad under gcc :-( */
  208. if (num == 32)
  209. { v0=v1; v1=d0; }
  210. else if (num == 64)
  211. { v0=d0; v1=d1; }
  212. else
  213. {
  214. iv=&ovec[0];
  215. l2c(v0,iv);
  216. l2c(v1,iv);
  217. l2c(d0,iv);
  218. l2c(d1,iv);
  219. /* shift ovec left most of the bits... */
  220. memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
  221. /* now the remaining bits */
  222. if(num%8 != 0)
  223. for(i=0 ; i < 8 ; ++i)
  224. {
  225. ovec[i]<<=num%8;
  226. ovec[i]|=ovec[i+1]>>(8-num%8);
  227. }
  228. iv=&ovec[0];
  229. c2l(iv,v0);
  230. c2l(iv,v1);
  231. }
  232. d0^=ti[0];
  233. d1^=ti[1];
  234. l2cn(d0,d1,out,n);
  235. out+=n;
  236. }
  237. }
  238. iv = &(*ivec)[0];
  239. l2c(v0,iv);
  240. l2c(v1,iv);
  241. v0=v1=d0=d1=ti[0]=ti[1]=0;
  242. }