ecs_lib.c 6.6 KB

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  1. /* crypto/ecdsa/ecs_lib.c */
  2. /* ====================================================================
  3. * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. *
  9. * 1. Redistributions of source code must retain the above copyright
  10. * notice, this list of conditions and the following disclaimer.
  11. *
  12. * 2. Redistributions in binary form must reproduce the above copyright
  13. * notice, this list of conditions and the following disclaimer in
  14. * the documentation and/or other materials provided with the
  15. * distribution.
  16. *
  17. * 3. All advertising materials mentioning features or use of this
  18. * software must display the following acknowledgment:
  19. * "This product includes software developed by the OpenSSL Project
  20. * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  21. *
  22. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23. * endorse or promote products derived from this software without
  24. * prior written permission. For written permission, please contact
  25. * openssl-core@OpenSSL.org.
  26. *
  27. * 5. Products derived from this software may not be called "OpenSSL"
  28. * nor may "OpenSSL" appear in their names without prior written
  29. * permission of the OpenSSL Project.
  30. *
  31. * 6. Redistributions of any form whatsoever must retain the following
  32. * acknowledgment:
  33. * "This product includes software developed by the OpenSSL Project
  34. * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  35. *
  36. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47. * OF THE POSSIBILITY OF SUCH DAMAGE.
  48. * ====================================================================
  49. *
  50. * This product includes cryptographic software written by Eric Young
  51. * (eay@cryptsoft.com). This product includes software written by Tim
  52. * Hudson (tjh@cryptsoft.com).
  53. *
  54. */
  55. #include <string.h>
  56. #include "ecs_locl.h"
  57. #ifndef OPENSSL_NO_ENGINE
  58. #include <openssl/engine.h>
  59. #endif
  60. #include <openssl/err.h>
  61. #include <openssl/bn.h>
  62. const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT;
  63. static const ECDSA_METHOD *default_ECDSA_method = NULL;
  64. static void *ecdsa_data_new(void);
  65. static void *ecdsa_data_dup(void *);
  66. static void ecdsa_data_free(void *);
  67. void ECDSA_set_default_method(const ECDSA_METHOD *meth)
  68. {
  69. default_ECDSA_method = meth;
  70. }
  71. const ECDSA_METHOD *ECDSA_get_default_method(void)
  72. {
  73. if(!default_ECDSA_method)
  74. default_ECDSA_method = ECDSA_OpenSSL();
  75. return default_ECDSA_method;
  76. }
  77. int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
  78. {
  79. ECDSA_DATA *ecdsa;
  80. ecdsa = ecdsa_check(eckey);
  81. if (ecdsa == NULL)
  82. return 0;
  83. #ifndef OPENSSL_NO_ENGINE
  84. if (ecdsa->engine)
  85. {
  86. ENGINE_finish(ecdsa->engine);
  87. ecdsa->engine = NULL;
  88. }
  89. #endif
  90. ecdsa->meth = meth;
  91. return 1;
  92. }
  93. static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
  94. {
  95. ECDSA_DATA *ret;
  96. ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
  97. if (ret == NULL)
  98. {
  99. ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  100. return(NULL);
  101. }
  102. ret->init = NULL;
  103. ret->meth = ECDSA_get_default_method();
  104. ret->engine = engine;
  105. #ifndef OPENSSL_NO_ENGINE
  106. if (!ret->engine)
  107. ret->engine = ENGINE_get_default_ECDSA();
  108. if (ret->engine)
  109. {
  110. ret->meth = ENGINE_get_ECDSA(ret->engine);
  111. if (!ret->meth)
  112. {
  113. ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
  114. ENGINE_finish(ret->engine);
  115. OPENSSL_free(ret);
  116. return NULL;
  117. }
  118. }
  119. #endif
  120. ret->flags = ret->meth->flags;
  121. CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
  122. #if 0
  123. if ((ret->meth->init != NULL) && !ret->meth->init(ret))
  124. {
  125. CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
  126. OPENSSL_free(ret);
  127. ret=NULL;
  128. }
  129. #endif
  130. return(ret);
  131. }
  132. static void *ecdsa_data_new(void)
  133. {
  134. return (void *)ECDSA_DATA_new_method(NULL);
  135. }
  136. static void *ecdsa_data_dup(void *data)
  137. {
  138. ECDSA_DATA *r = (ECDSA_DATA *)data;
  139. /* XXX: dummy operation */
  140. if (r == NULL)
  141. return NULL;
  142. return ecdsa_data_new();
  143. }
  144. static void ecdsa_data_free(void *data)
  145. {
  146. ECDSA_DATA *r = (ECDSA_DATA *)data;
  147. #ifndef OPENSSL_NO_ENGINE
  148. if (r->engine)
  149. ENGINE_finish(r->engine);
  150. #endif
  151. CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
  152. OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
  153. OPENSSL_free(r);
  154. }
  155. ECDSA_DATA *ecdsa_check(EC_KEY *key)
  156. {
  157. ECDSA_DATA *ecdsa_data;
  158. void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
  159. ecdsa_data_free, ecdsa_data_free);
  160. if (data == NULL)
  161. {
  162. ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
  163. if (ecdsa_data == NULL)
  164. return NULL;
  165. EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
  166. ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
  167. }
  168. else
  169. ecdsa_data = (ECDSA_DATA *)data;
  170. return ecdsa_data;
  171. }
  172. int ECDSA_size(const EC_KEY *r)
  173. {
  174. int ret,i;
  175. ASN1_INTEGER bs;
  176. BIGNUM *order=NULL;
  177. unsigned char buf[4];
  178. const EC_GROUP *group;
  179. if (r == NULL)
  180. return 0;
  181. group = EC_KEY_get0_group(r);
  182. if (group == NULL)
  183. return 0;
  184. if ((order = BN_new()) == NULL) return 0;
  185. if (!EC_GROUP_get_order(group,order,NULL))
  186. {
  187. BN_clear_free(order);
  188. return 0;
  189. }
  190. i=BN_num_bits(order);
  191. bs.length=(i+7)/8;
  192. bs.data=buf;
  193. bs.type=V_ASN1_INTEGER;
  194. /* If the top bit is set the asn1 encoding is 1 larger. */
  195. buf[0]=0xff;
  196. i=i2d_ASN1_INTEGER(&bs,NULL);
  197. i+=i; /* r and s */
  198. ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
  199. BN_clear_free(order);
  200. return(ret);
  201. }
  202. int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
  203. CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
  204. {
  205. return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
  206. new_func, dup_func, free_func);
  207. }
  208. int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
  209. {
  210. ECDSA_DATA *ecdsa;
  211. ecdsa = ecdsa_check(d);
  212. if (ecdsa == NULL)
  213. return 0;
  214. return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
  215. }
  216. void *ECDSA_get_ex_data(EC_KEY *d, int idx)
  217. {
  218. ECDSA_DATA *ecdsa;
  219. ecdsa = ecdsa_check(d);
  220. if (ecdsa == NULL)
  221. return NULL;
  222. return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
  223. }