tb_cipher.c 4.7 KB

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  1. /* ====================================================================
  2. * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. *
  11. * 2. Redistributions in binary form must reproduce the above copyright
  12. * notice, this list of conditions and the following disclaimer in
  13. * the documentation and/or other materials provided with the
  14. * distribution.
  15. *
  16. * 3. All advertising materials mentioning features or use of this
  17. * software must display the following acknowledgment:
  18. * "This product includes software developed by the OpenSSL Project
  19. * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20. *
  21. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22. * endorse or promote products derived from this software without
  23. * prior written permission. For written permission, please contact
  24. * licensing@OpenSSL.org.
  25. *
  26. * 5. Products derived from this software may not be called "OpenSSL"
  27. * nor may "OpenSSL" appear in their names without prior written
  28. * permission of the OpenSSL Project.
  29. *
  30. * 6. Redistributions of any form whatsoever must retain the following
  31. * acknowledgment:
  32. * "This product includes software developed by the OpenSSL Project
  33. * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34. *
  35. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46. * OF THE POSSIBILITY OF SUCH DAMAGE.
  47. * ====================================================================
  48. *
  49. * This product includes cryptographic software written by Eric Young
  50. * (eay@cryptsoft.com). This product includes software written by Tim
  51. * Hudson (tjh@cryptsoft.com).
  52. *
  53. */
  54. #include "eng_int.h"
  55. /* If this symbol is defined then ENGINE_get_cipher_engine(), the function that
  56. * is used by EVP to hook in cipher code and cache defaults (etc), will display
  57. * brief debugging summaries to stderr with the 'nid'. */
  58. /* #define ENGINE_CIPHER_DEBUG */
  59. static ENGINE_TABLE *cipher_table = NULL;
  60. void ENGINE_unregister_ciphers(ENGINE *e)
  61. {
  62. engine_table_unregister(&cipher_table, e);
  63. }
  64. static void engine_unregister_all_ciphers(void)
  65. {
  66. engine_table_cleanup(&cipher_table);
  67. }
  68. int ENGINE_register_ciphers(ENGINE *e)
  69. {
  70. if(e->ciphers)
  71. {
  72. const int *nids;
  73. int num_nids = e->ciphers(e, NULL, &nids, 0);
  74. if(num_nids > 0)
  75. return engine_table_register(&cipher_table,
  76. engine_unregister_all_ciphers, e, nids,
  77. num_nids, 0);
  78. }
  79. return 1;
  80. }
  81. void ENGINE_register_all_ciphers()
  82. {
  83. ENGINE *e;
  84. for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
  85. ENGINE_register_ciphers(e);
  86. }
  87. int ENGINE_set_default_ciphers(ENGINE *e)
  88. {
  89. if(e->ciphers)
  90. {
  91. const int *nids;
  92. int num_nids = e->ciphers(e, NULL, &nids, 0);
  93. if(num_nids > 0)
  94. return engine_table_register(&cipher_table,
  95. engine_unregister_all_ciphers, e, nids,
  96. num_nids, 1);
  97. }
  98. return 1;
  99. }
  100. /* Exposed API function to get a functional reference from the implementation
  101. * table (ie. try to get a functional reference from the tabled structural
  102. * references) for a given cipher 'nid' */
  103. ENGINE *ENGINE_get_cipher_engine(int nid)
  104. {
  105. return engine_table_select(&cipher_table, nid);
  106. }
  107. /* Obtains a cipher implementation from an ENGINE functional reference */
  108. const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid)
  109. {
  110. const EVP_CIPHER *ret;
  111. ENGINE_CIPHERS_PTR fn = ENGINE_get_ciphers(e);
  112. if(!fn || !fn(e, &ret, NULL, nid))
  113. {
  114. ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER,
  115. ENGINE_R_UNIMPLEMENTED_CIPHER);
  116. return NULL;
  117. }
  118. return ret;
  119. }
  120. /* Gets the cipher callback from an ENGINE structure */
  121. ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e)
  122. {
  123. return e->ciphers;
  124. }
  125. /* Sets the cipher callback in an ENGINE structure */
  126. int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f)
  127. {
  128. e->ciphers = f;
  129. return 1;
  130. }