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e_des.c 6.3 KB

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  1. /* crypto/evp/e_des.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. #include "cryptlib.h"
  60. #ifndef OPENSSL_NO_DES
  61. #include <openssl/evp.h>
  62. #include <openssl/objects.h>
  63. #include "evp_locl.h"
  64. #include <openssl/des.h>
  65. #include <openssl/rand.h>
  66. static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  67. const unsigned char *iv, int enc);
  68. static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  69. /* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */
  70. static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  71. const unsigned char *in, unsigned int inl)
  72. {
  73. BLOCK_CIPHER_ecb_loop()
  74. DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);
  75. return 1;
  76. }
  77. static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  78. const unsigned char *in, unsigned int inl)
  79. {
  80. DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, (DES_cblock *)ctx->iv, &ctx->num);
  81. return 1;
  82. }
  83. static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  84. const unsigned char *in, unsigned int inl)
  85. {
  86. DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
  87. (DES_cblock *)ctx->iv, ctx->encrypt);
  88. return 1;
  89. }
  90. static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  91. const unsigned char *in, unsigned int inl)
  92. {
  93. DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
  94. (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
  95. return 1;
  96. }
  97. /* Although we have a CFB-r implementation for DES, it doesn't pack the right
  98. way, so wrap it here */
  99. static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  100. const unsigned char *in, unsigned int inl)
  101. {
  102. unsigned int n;
  103. unsigned char c[1],d[1];
  104. for(n=0 ; n < inl ; ++n)
  105. {
  106. c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
  107. DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
  108. ctx->encrypt);
  109. out[n/8]=(out[n/8]&~(0x80 >> (n%8)))|((d[0]&0x80) >> (n%8));
  110. }
  111. return 1;
  112. }
  113. static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  114. const unsigned char *in, unsigned int inl)
  115. {
  116. DES_cfb_encrypt(in,out,8,inl,ctx->cipher_data,(DES_cblock *)ctx->iv,
  117. ctx->encrypt);
  118. return 1;
  119. }
  120. BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
  121. EVP_CIPH_RAND_KEY, des_init_key, NULL,
  122. EVP_CIPHER_set_asn1_iv,
  123. EVP_CIPHER_get_asn1_iv,
  124. des_ctrl)
  125. BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
  126. EVP_CIPH_RAND_KEY, des_init_key,NULL,
  127. EVP_CIPHER_set_asn1_iv,
  128. EVP_CIPHER_get_asn1_iv,des_ctrl)
  129. BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
  130. EVP_CIPH_RAND_KEY,des_init_key,NULL,
  131. EVP_CIPHER_set_asn1_iv,
  132. EVP_CIPHER_get_asn1_iv,des_ctrl)
  133. static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  134. const unsigned char *iv, int enc)
  135. {
  136. DES_cblock *deskey = (DES_cblock *)key;
  137. #ifdef EVP_CHECK_DES_KEY
  138. if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)
  139. return 0;
  140. #else
  141. DES_set_key_unchecked(deskey,ctx->cipher_data);
  142. #endif
  143. return 1;
  144. }
  145. static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
  146. {
  147. switch(type)
  148. {
  149. case EVP_CTRL_RAND_KEY:
  150. if (RAND_bytes(ptr, 8) <= 0)
  151. return 0;
  152. DES_set_odd_parity((DES_cblock *)ptr);
  153. return 1;
  154. default:
  155. return -1;
  156. }
  157. }
  158. #endif