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e_xcbc_d.c 4.8 KB

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  1. /* crypto/evp/e_xcbc_d.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. static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  66. const unsigned char *iv,int enc);
  67. static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  68. const unsigned char *in, size_t inl);
  69. typedef struct
  70. {
  71. DES_key_schedule ks;/* key schedule */
  72. DES_cblock inw;
  73. DES_cblock outw;
  74. } DESX_CBC_KEY;
  75. #define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data)
  76. static const EVP_CIPHER d_xcbc_cipher=
  77. {
  78. NID_desx_cbc,
  79. 8,24,8,
  80. EVP_CIPH_CBC_MODE,
  81. desx_cbc_init_key,
  82. desx_cbc_cipher,
  83. NULL,
  84. sizeof(DESX_CBC_KEY),
  85. EVP_CIPHER_set_asn1_iv,
  86. EVP_CIPHER_get_asn1_iv,
  87. NULL,
  88. NULL
  89. };
  90. const EVP_CIPHER *EVP_desx_cbc(void)
  91. {
  92. return(&d_xcbc_cipher);
  93. }
  94. static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  95. const unsigned char *iv, int enc)
  96. {
  97. DES_cblock *deskey = (DES_cblock *)key;
  98. DES_set_key_unchecked(deskey,&data(ctx)->ks);
  99. memcpy(&data(ctx)->inw[0],&key[8],8);
  100. memcpy(&data(ctx)->outw[0],&key[16],8);
  101. return 1;
  102. }
  103. static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  104. const unsigned char *in, size_t inl)
  105. {
  106. while (inl>=EVP_MAXCHUNK)
  107. {
  108. DES_xcbc_encrypt(in,out,(long)EVP_MAXCHUNK,&data(ctx)->ks,
  109. (DES_cblock *)&(ctx->iv[0]),
  110. &data(ctx)->inw,
  111. &data(ctx)->outw,
  112. ctx->encrypt);
  113. inl-=EVP_MAXCHUNK;
  114. in +=EVP_MAXCHUNK;
  115. out+=EVP_MAXCHUNK;
  116. }
  117. if (inl)
  118. DES_xcbc_encrypt(in,out,(long)inl,&data(ctx)->ks,
  119. (DES_cblock *)&(ctx->iv[0]),
  120. &data(ctx)->inw,
  121. &data(ctx)->outw,
  122. ctx->encrypt);
  123. return 1;
  124. }
  125. #endif