p_open.c 4.5 KB

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  1. /* crypto/evp/p_open.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_RSA
  61. #include <openssl/evp.h>
  62. #include <openssl/objects.h>
  63. #include <openssl/x509.h>
  64. #include <openssl/rsa.h>
  65. int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
  66. const unsigned char *ek, int ekl, const unsigned char *iv,
  67. EVP_PKEY *priv)
  68. {
  69. unsigned char *key=NULL;
  70. int i,size=0,ret=0;
  71. if(type) {
  72. EVP_CIPHER_CTX_init(ctx);
  73. if(!EVP_DecryptInit_ex(ctx,type,NULL, NULL,NULL)) return 0;
  74. }
  75. if(!priv) return 1;
  76. if (priv->type != EVP_PKEY_RSA)
  77. {
  78. EVPerr(EVP_F_EVP_OPENINIT,EVP_R_PUBLIC_KEY_NOT_RSA);
  79. goto err;
  80. }
  81. size=RSA_size(priv->pkey.rsa);
  82. key=(unsigned char *)OPENSSL_malloc(size+2);
  83. if (key == NULL)
  84. {
  85. /* ERROR */
  86. EVPerr(EVP_F_EVP_OPENINIT,ERR_R_MALLOC_FAILURE);
  87. goto err;
  88. }
  89. i=EVP_PKEY_decrypt_old(key,ek,ekl,priv);
  90. if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i))
  91. {
  92. /* ERROR */
  93. goto err;
  94. }
  95. if(!EVP_DecryptInit_ex(ctx,NULL,NULL,key,iv)) goto err;
  96. ret=1;
  97. err:
  98. if (key != NULL) OPENSSL_cleanse(key,size);
  99. OPENSSL_free(key);
  100. return(ret);
  101. }
  102. int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
  103. {
  104. int i;
  105. i=EVP_DecryptFinal_ex(ctx,out,outl);
  106. if (i)
  107. i = EVP_DecryptInit_ex(ctx,NULL,NULL,NULL,NULL);
  108. return(i);
  109. }
  110. #else /* !OPENSSL_NO_RSA */
  111. # ifdef PEDANTIC
  112. static void *dummy=&dummy;
  113. # endif
  114. #endif