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ecp_mont.c 8.3 KB

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  1. /* crypto/ec/ecp_mont.c */
  2. /*
  3. * Originally written by Bodo Moeller for the OpenSSL project.
  4. */
  5. /* ====================================================================
  6. * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions
  10. * are met:
  11. *
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. *
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in
  17. * the documentation and/or other materials provided with the
  18. * distribution.
  19. *
  20. * 3. All advertising materials mentioning features or use of this
  21. * software must display the following acknowledgment:
  22. * "This product includes software developed by the OpenSSL Project
  23. * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24. *
  25. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26. * endorse or promote products derived from this software without
  27. * prior written permission. For written permission, please contact
  28. * openssl-core@openssl.org.
  29. *
  30. * 5. Products derived from this software may not be called "OpenSSL"
  31. * nor may "OpenSSL" appear in their names without prior written
  32. * permission of the OpenSSL Project.
  33. *
  34. * 6. Redistributions of any form whatsoever must retain the following
  35. * acknowledgment:
  36. * "This product includes software developed by the OpenSSL Project
  37. * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38. *
  39. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50. * OF THE POSSIBILITY OF SUCH DAMAGE.
  51. * ====================================================================
  52. *
  53. * This product includes cryptographic software written by Eric Young
  54. * (eay@cryptsoft.com). This product includes software written by Tim
  55. * Hudson (tjh@cryptsoft.com).
  56. *
  57. */
  58. /* ====================================================================
  59. * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  60. * Portions of this software developed by SUN MICROSYSTEMS, INC.,
  61. * and contributed to the OpenSSL project.
  62. */
  63. #define OPENSSL_FIPSAPI
  64. #include <openssl/err.h>
  65. #include "ec_lcl.h"
  66. const EC_METHOD *EC_GFp_mont_method(void)
  67. {
  68. static const EC_METHOD ret = {
  69. EC_FLAGS_DEFAULT_OCT,
  70. NID_X9_62_prime_field,
  71. ec_GFp_mont_group_init,
  72. ec_GFp_mont_group_finish,
  73. ec_GFp_mont_group_clear_finish,
  74. ec_GFp_mont_group_copy,
  75. ec_GFp_mont_group_set_curve,
  76. ec_GFp_simple_group_get_curve,
  77. ec_GFp_simple_group_get_degree,
  78. ec_GFp_simple_group_check_discriminant,
  79. ec_GFp_simple_point_init,
  80. ec_GFp_simple_point_finish,
  81. ec_GFp_simple_point_clear_finish,
  82. ec_GFp_simple_point_copy,
  83. ec_GFp_simple_point_set_to_infinity,
  84. ec_GFp_simple_set_Jprojective_coordinates_GFp,
  85. ec_GFp_simple_get_Jprojective_coordinates_GFp,
  86. ec_GFp_simple_point_set_affine_coordinates,
  87. ec_GFp_simple_point_get_affine_coordinates,
  88. 0,0,0,
  89. ec_GFp_simple_add,
  90. ec_GFp_simple_dbl,
  91. ec_GFp_simple_invert,
  92. ec_GFp_simple_is_at_infinity,
  93. ec_GFp_simple_is_on_curve,
  94. ec_GFp_simple_cmp,
  95. ec_GFp_simple_make_affine,
  96. ec_GFp_simple_points_make_affine,
  97. 0 /* mul */,
  98. 0 /* precompute_mult */,
  99. 0 /* have_precompute_mult */,
  100. ec_GFp_mont_field_mul,
  101. ec_GFp_mont_field_sqr,
  102. 0 /* field_div */,
  103. ec_GFp_mont_field_encode,
  104. ec_GFp_mont_field_decode,
  105. ec_GFp_mont_field_set_to_one };
  106. return &ret;
  107. }
  108. int ec_GFp_mont_group_init(EC_GROUP *group)
  109. {
  110. int ok;
  111. ok = ec_GFp_simple_group_init(group);
  112. group->field_data1 = NULL;
  113. group->field_data2 = NULL;
  114. return ok;
  115. }
  116. void ec_GFp_mont_group_finish(EC_GROUP *group)
  117. {
  118. if (group->field_data1 != NULL)
  119. {
  120. BN_MONT_CTX_free(group->field_data1);
  121. group->field_data1 = NULL;
  122. }
  123. if (group->field_data2 != NULL)
  124. {
  125. BN_free(group->field_data2);
  126. group->field_data2 = NULL;
  127. }
  128. ec_GFp_simple_group_finish(group);
  129. }
  130. void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
  131. {
  132. if (group->field_data1 != NULL)
  133. {
  134. BN_MONT_CTX_free(group->field_data1);
  135. group->field_data1 = NULL;
  136. }
  137. if (group->field_data2 != NULL)
  138. {
  139. BN_clear_free(group->field_data2);
  140. group->field_data2 = NULL;
  141. }
  142. ec_GFp_simple_group_clear_finish(group);
  143. }
  144. int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
  145. {
  146. if (dest->field_data1 != NULL)
  147. {
  148. BN_MONT_CTX_free(dest->field_data1);
  149. dest->field_data1 = NULL;
  150. }
  151. if (dest->field_data2 != NULL)
  152. {
  153. BN_clear_free(dest->field_data2);
  154. dest->field_data2 = NULL;
  155. }
  156. if (!ec_GFp_simple_group_copy(dest, src)) return 0;
  157. if (src->field_data1 != NULL)
  158. {
  159. dest->field_data1 = BN_MONT_CTX_new();
  160. if (dest->field_data1 == NULL) return 0;
  161. if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
  162. }
  163. if (src->field_data2 != NULL)
  164. {
  165. dest->field_data2 = BN_dup(src->field_data2);
  166. if (dest->field_data2 == NULL) goto err;
  167. }
  168. return 1;
  169. err:
  170. if (dest->field_data1 != NULL)
  171. {
  172. BN_MONT_CTX_free(dest->field_data1);
  173. dest->field_data1 = NULL;
  174. }
  175. return 0;
  176. }
  177. int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  178. {
  179. BN_CTX *new_ctx = NULL;
  180. BN_MONT_CTX *mont = NULL;
  181. BIGNUM *one = NULL;
  182. int ret = 0;
  183. if (group->field_data1 != NULL)
  184. {
  185. BN_MONT_CTX_free(group->field_data1);
  186. group->field_data1 = NULL;
  187. }
  188. if (group->field_data2 != NULL)
  189. {
  190. BN_free(group->field_data2);
  191. group->field_data2 = NULL;
  192. }
  193. if (ctx == NULL)
  194. {
  195. ctx = new_ctx = BN_CTX_new();
  196. if (ctx == NULL)
  197. return 0;
  198. }
  199. mont = BN_MONT_CTX_new();
  200. if (mont == NULL) goto err;
  201. if (!BN_MONT_CTX_set(mont, p, ctx))
  202. {
  203. ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
  204. goto err;
  205. }
  206. one = BN_new();
  207. if (one == NULL) goto err;
  208. if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
  209. group->field_data1 = mont;
  210. mont = NULL;
  211. group->field_data2 = one;
  212. one = NULL;
  213. ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
  214. if (!ret)
  215. {
  216. BN_MONT_CTX_free(group->field_data1);
  217. group->field_data1 = NULL;
  218. BN_free(group->field_data2);
  219. group->field_data2 = NULL;
  220. }
  221. err:
  222. if (new_ctx != NULL)
  223. BN_CTX_free(new_ctx);
  224. if (mont != NULL)
  225. BN_MONT_CTX_free(mont);
  226. return ret;
  227. }
  228. int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  229. {
  230. if (group->field_data1 == NULL)
  231. {
  232. ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
  233. return 0;
  234. }
  235. return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
  236. }
  237. int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
  238. {
  239. if (group->field_data1 == NULL)
  240. {
  241. ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
  242. return 0;
  243. }
  244. return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
  245. }
  246. int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
  247. {
  248. if (group->field_data1 == NULL)
  249. {
  250. ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
  251. return 0;
  252. }
  253. return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
  254. }
  255. int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
  256. {
  257. if (group->field_data1 == NULL)
  258. {
  259. ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
  260. return 0;
  261. }
  262. return BN_from_montgomery(r, a, group->field_data1, ctx);
  263. }
  264. int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
  265. {
  266. if (group->field_data2 == NULL)
  267. {
  268. ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
  269. return 0;
  270. }
  271. if (!BN_copy(r, group->field_data2)) return 0;
  272. return 1;
  273. }