1 /* crypto/ec/ecp_nist.c */ 2 /* 3 * Written by Nils Larsch for the OpenSSL project. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1998-2003 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 64 #include <limits.h> 65 66 #include <openssl/err.h> 67 #include <openssl/obj_mac.h> 68 #include "ec_lcl.h" 69 70 const EC_METHOD *EC_GFp_nist_method(void) 71 { 72 static const EC_METHOD ret = { 73 NID_X9_62_prime_field, 74 ec_GFp_simple_group_init, 75 ec_GFp_simple_group_finish, 76 ec_GFp_simple_group_clear_finish, 77 ec_GFp_nist_group_copy, 78 ec_GFp_nist_group_set_curve, 79 ec_GFp_simple_group_get_curve, 80 ec_GFp_simple_group_get_degree, 81 ec_GFp_simple_group_check_discriminant, 82 ec_GFp_simple_point_init, 83 ec_GFp_simple_point_finish, 84 ec_GFp_simple_point_clear_finish, 85 ec_GFp_simple_point_copy, 86 ec_GFp_simple_point_set_to_infinity, 87 ec_GFp_simple_set_Jprojective_coordinates_GFp, 88 ec_GFp_simple_get_Jprojective_coordinates_GFp, 89 ec_GFp_simple_point_set_affine_coordinates, 90 ec_GFp_simple_point_get_affine_coordinates, 91 ec_GFp_simple_set_compressed_coordinates, 92 ec_GFp_simple_point2oct, 93 ec_GFp_simple_oct2point, 94 ec_GFp_simple_add, 95 ec_GFp_simple_dbl, 96 ec_GFp_simple_invert, 97 ec_GFp_simple_is_at_infinity, 98 ec_GFp_simple_is_on_curve, 99 ec_GFp_simple_cmp, 100 ec_GFp_simple_make_affine, 101 ec_GFp_simple_points_make_affine, 102 0 /* mul */, 103 0 /* precompute_mult */, 104 0 /* have_precompute_mult */, 105 ec_GFp_nist_field_mul, 106 ec_GFp_nist_field_sqr, 107 0 /* field_div */, 108 0 /* field_encode */, 109 0 /* field_decode */, 110 0 /* field_set_to_one */ }; 111 112 return &ret; 113 } 114 115 #if BN_BITS2 == 64 116 #define NO_32_BIT_TYPE 117 #endif 118 119 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src) 120 { 121 dest->field_mod_func = src->field_mod_func; 122 123 return ec_GFp_simple_group_copy(dest, src); 124 } 125 126 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, 127 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 128 { 129 int ret = 0; 130 BN_CTX *new_ctx = NULL; 131 BIGNUM *tmp_bn; 132 133 if (ctx == NULL) 134 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0; 135 136 BN_CTX_start(ctx); 137 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err; 138 139 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) 140 group->field_mod_func = BN_nist_mod_192; 141 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) 142 { 143 #ifndef NO_32_BIT_TYPE 144 group->field_mod_func = BN_nist_mod_224; 145 #else 146 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME); 147 goto err; 148 #endif 149 } 150 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) 151 { 152 #ifndef NO_32_BIT_TYPE 153 group->field_mod_func = BN_nist_mod_256; 154 #else 155 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME); 156 goto err; 157 #endif 158 } 159 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) 160 { 161 #ifndef NO_32_BIT_TYPE 162 group->field_mod_func = BN_nist_mod_384; 163 #else 164 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_SUPPORTED_NIST_PRIME); 165 goto err; 166 #endif 167 } 168 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) 169 /* this one works in the NO_32_BIT_TYPE case */ 170 group->field_mod_func = BN_nist_mod_521; 171 else 172 { 173 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME); 174 goto err; 175 } 176 177 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 178 179 err: 180 BN_CTX_end(ctx); 181 if (new_ctx != NULL) 182 BN_CTX_free(new_ctx); 183 return ret; 184 } 185 186 187 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 188 const BIGNUM *b, BN_CTX *ctx) 189 { 190 int ret=0; 191 BN_CTX *ctx_new=NULL; 192 193 if (!group || !r || !a || !b) 194 { 195 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER); 196 goto err; 197 } 198 if (!ctx) 199 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; 200 201 if (!BN_mul(r, a, b, ctx)) goto err; 202 if (!group->field_mod_func(r, r, &group->field, ctx)) 203 goto err; 204 205 ret=1; 206 err: 207 if (ctx_new) 208 BN_CTX_free(ctx_new); 209 return ret; 210 } 211 212 213 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 214 BN_CTX *ctx) 215 { 216 int ret=0; 217 BN_CTX *ctx_new=NULL; 218 219 if (!group || !r || !a) 220 { 221 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER); 222 goto err; 223 } 224 if (!ctx) 225 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; 226 227 if (!BN_sqr(r, a, ctx)) goto err; 228 if (!group->field_mod_func(r, r, &group->field, ctx)) 229 goto err; 230 231 ret=1; 232 err: 233 if (ctx_new) 234 BN_CTX_free(ctx_new); 235 return ret; 236 } 237
