ecp_mont.c revision 160814
1109998Smarkm/* crypto/ec/ecp_mont.c */ 2160814Ssimon/* 3160814Ssimon * Originally written by Bodo Moeller for the OpenSSL project. 4160814Ssimon */ 5109998Smarkm/* ==================================================================== 6109998Smarkm * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 7109998Smarkm * 8109998Smarkm * Redistribution and use in source and binary forms, with or without 9109998Smarkm * modification, are permitted provided that the following conditions 10109998Smarkm * are met: 11109998Smarkm * 12109998Smarkm * 1. Redistributions of source code must retain the above copyright 13109998Smarkm * notice, this list of conditions and the following disclaimer. 14109998Smarkm * 15109998Smarkm * 2. Redistributions in binary form must reproduce the above copyright 16109998Smarkm * notice, this list of conditions and the following disclaimer in 17109998Smarkm * the documentation and/or other materials provided with the 18109998Smarkm * distribution. 19109998Smarkm * 20109998Smarkm * 3. All advertising materials mentioning features or use of this 21109998Smarkm * software must display the following acknowledgment: 22109998Smarkm * "This product includes software developed by the OpenSSL Project 23109998Smarkm * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24109998Smarkm * 25109998Smarkm * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26109998Smarkm * endorse or promote products derived from this software without 27109998Smarkm * prior written permission. For written permission, please contact 28109998Smarkm * openssl-core@openssl.org. 29109998Smarkm * 30109998Smarkm * 5. Products derived from this software may not be called "OpenSSL" 31109998Smarkm * nor may "OpenSSL" appear in their names without prior written 32109998Smarkm * permission of the OpenSSL Project. 33109998Smarkm * 34109998Smarkm * 6. Redistributions of any form whatsoever must retain the following 35109998Smarkm * acknowledgment: 36109998Smarkm * "This product includes software developed by the OpenSSL Project 37109998Smarkm * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38109998Smarkm * 39109998Smarkm * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40109998Smarkm * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41109998Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42109998Smarkm * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43109998Smarkm * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44109998Smarkm * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45109998Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46109998Smarkm * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47109998Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48109998Smarkm * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49109998Smarkm * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50109998Smarkm * OF THE POSSIBILITY OF SUCH DAMAGE. 51109998Smarkm * ==================================================================== 52109998Smarkm * 53109998Smarkm * This product includes cryptographic software written by Eric Young 54109998Smarkm * (eay@cryptsoft.com). This product includes software written by Tim 55109998Smarkm * Hudson (tjh@cryptsoft.com). 56109998Smarkm * 57109998Smarkm */ 58160814Ssimon/* ==================================================================== 59160814Ssimon * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60160814Ssimon * Portions of this software developed by SUN MICROSYSTEMS, INC., 61160814Ssimon * and contributed to the OpenSSL project. 62160814Ssimon */ 63109998Smarkm 64109998Smarkm#include <openssl/err.h> 65109998Smarkm 66109998Smarkm#include "ec_lcl.h" 67109998Smarkm 68109998Smarkm 69109998Smarkmconst EC_METHOD *EC_GFp_mont_method(void) 70109998Smarkm { 71109998Smarkm static const EC_METHOD ret = { 72160814Ssimon NID_X9_62_prime_field, 73109998Smarkm ec_GFp_mont_group_init, 74109998Smarkm ec_GFp_mont_group_finish, 75109998Smarkm ec_GFp_mont_group_clear_finish, 76109998Smarkm ec_GFp_mont_group_copy, 77160814Ssimon ec_GFp_mont_group_set_curve, 78160814Ssimon ec_GFp_simple_group_get_curve, 79160814Ssimon ec_GFp_simple_group_get_degree, 80160814Ssimon ec_GFp_simple_group_check_discriminant, 81109998Smarkm ec_GFp_simple_point_init, 82109998Smarkm ec_GFp_simple_point_finish, 83109998Smarkm ec_GFp_simple_point_clear_finish, 84109998Smarkm ec_GFp_simple_point_copy, 85109998Smarkm ec_GFp_simple_point_set_to_infinity, 86109998Smarkm ec_GFp_simple_set_Jprojective_coordinates_GFp, 87109998Smarkm ec_GFp_simple_get_Jprojective_coordinates_GFp, 88160814Ssimon ec_GFp_simple_point_set_affine_coordinates, 89160814Ssimon ec_GFp_simple_point_get_affine_coordinates, 90160814Ssimon ec_GFp_simple_set_compressed_coordinates, 91109998Smarkm ec_GFp_simple_point2oct, 92109998Smarkm ec_GFp_simple_oct2point, 93109998Smarkm ec_GFp_simple_add, 94109998Smarkm ec_GFp_simple_dbl, 95109998Smarkm ec_GFp_simple_invert, 96109998Smarkm ec_GFp_simple_is_at_infinity, 97109998Smarkm ec_GFp_simple_is_on_curve, 98109998Smarkm ec_GFp_simple_cmp, 99109998Smarkm ec_GFp_simple_make_affine, 100109998Smarkm ec_GFp_simple_points_make_affine, 101160814Ssimon 0 /* mul */, 102160814Ssimon 0 /* precompute_mult */, 103160814Ssimon 0 /* have_precompute_mult */, 104109998Smarkm ec_GFp_mont_field_mul, 105109998Smarkm ec_GFp_mont_field_sqr, 106160814Ssimon 0 /* field_div */, 107109998Smarkm ec_GFp_mont_field_encode, 108109998Smarkm ec_GFp_mont_field_decode, 109109998Smarkm ec_GFp_mont_field_set_to_one }; 110109998Smarkm 111109998Smarkm return &ret; 112109998Smarkm } 113109998Smarkm 114109998Smarkm 115109998Smarkmint ec_GFp_mont_group_init(EC_GROUP *group) 116109998Smarkm { 117109998Smarkm int ok; 118109998Smarkm 119109998Smarkm ok = ec_GFp_simple_group_init(group); 120109998Smarkm group->field_data1 = NULL; 121109998Smarkm group->field_data2 = NULL; 122109998Smarkm return ok; 123109998Smarkm } 124109998Smarkm 125109998Smarkm 126109998Smarkmvoid ec_GFp_mont_group_finish(EC_GROUP *group) 127109998Smarkm { 128109998Smarkm if (group->field_data1 != NULL) 129109998Smarkm { 130109998Smarkm BN_MONT_CTX_free(group->field_data1); 131109998Smarkm group->field_data1 = NULL; 132109998Smarkm } 133109998Smarkm if (group->field_data2 != NULL) 134109998Smarkm { 135109998Smarkm BN_free(group->field_data2); 136109998Smarkm group->field_data2 = NULL; 137109998Smarkm } 138109998Smarkm ec_GFp_simple_group_finish(group); 139109998Smarkm } 140109998Smarkm 141109998Smarkm 142109998Smarkmvoid ec_GFp_mont_group_clear_finish(EC_GROUP *group) 143109998Smarkm { 144109998Smarkm if (group->field_data1 != NULL) 145109998Smarkm { 146109998Smarkm BN_MONT_CTX_free(group->field_data1); 147109998Smarkm group->field_data1 = NULL; 148109998Smarkm } 149109998Smarkm if (group->field_data2 != NULL) 150109998Smarkm { 151109998Smarkm BN_clear_free(group->field_data2); 152109998Smarkm group->field_data2 = NULL; 153109998Smarkm } 154109998Smarkm ec_GFp_simple_group_clear_finish(group); 155109998Smarkm } 156109998Smarkm 157109998Smarkm 158109998Smarkmint ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 159109998Smarkm { 160109998Smarkm if (dest->field_data1 != NULL) 161109998Smarkm { 162109998Smarkm BN_MONT_CTX_free(dest->field_data1); 163109998Smarkm dest->field_data1 = NULL; 164109998Smarkm } 165109998Smarkm if (dest->field_data2 != NULL) 166109998Smarkm { 167109998Smarkm BN_clear_free(dest->field_data2); 168109998Smarkm dest->field_data2 = NULL; 169109998Smarkm } 170109998Smarkm 171109998Smarkm if (!ec_GFp_simple_group_copy(dest, src)) return 0; 172109998Smarkm 173109998Smarkm if (src->field_data1 != NULL) 174109998Smarkm { 175109998Smarkm dest->field_data1 = BN_MONT_CTX_new(); 176109998Smarkm if (dest->field_data1 == NULL) return 0; 177109998Smarkm if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err; 178109998Smarkm } 179109998Smarkm if (src->field_data2 != NULL) 180109998Smarkm { 181109998Smarkm dest->field_data2 = BN_dup(src->field_data2); 182109998Smarkm if (dest->field_data2 == NULL) goto err; 183109998Smarkm } 184109998Smarkm 185109998Smarkm return 1; 186109998Smarkm 187109998Smarkm err: 188109998Smarkm if (dest->field_data1 != NULL) 189109998Smarkm { 190109998Smarkm BN_MONT_CTX_free(dest->field_data1); 191109998Smarkm dest->field_data1 = NULL; 192109998Smarkm } 193109998Smarkm return 0; 194109998Smarkm } 195109998Smarkm 196109998Smarkm 197160814Ssimonint ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 198160814Ssimon { 199160814Ssimon BN_CTX *new_ctx = NULL; 200160814Ssimon BN_MONT_CTX *mont = NULL; 201160814Ssimon BIGNUM *one = NULL; 202160814Ssimon int ret = 0; 203160814Ssimon 204160814Ssimon if (group->field_data1 != NULL) 205160814Ssimon { 206160814Ssimon BN_MONT_CTX_free(group->field_data1); 207160814Ssimon group->field_data1 = NULL; 208160814Ssimon } 209160814Ssimon if (group->field_data2 != NULL) 210160814Ssimon { 211160814Ssimon BN_free(group->field_data2); 212160814Ssimon group->field_data2 = NULL; 213160814Ssimon } 214160814Ssimon 215160814Ssimon if (ctx == NULL) 216160814Ssimon { 217160814Ssimon ctx = new_ctx = BN_CTX_new(); 218160814Ssimon if (ctx == NULL) 219160814Ssimon return 0; 220160814Ssimon } 221160814Ssimon 222160814Ssimon mont = BN_MONT_CTX_new(); 223160814Ssimon if (mont == NULL) goto err; 224160814Ssimon if (!BN_MONT_CTX_set(mont, p, ctx)) 225160814Ssimon { 226160814Ssimon ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 227160814Ssimon goto err; 228160814Ssimon } 229160814Ssimon one = BN_new(); 230160814Ssimon if (one == NULL) goto err; 231160814Ssimon if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err; 232160814Ssimon 233160814Ssimon group->field_data1 = mont; 234160814Ssimon mont = NULL; 235160814Ssimon group->field_data2 = one; 236160814Ssimon one = NULL; 237160814Ssimon 238160814Ssimon ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 239160814Ssimon 240160814Ssimon if (!ret) 241160814Ssimon { 242160814Ssimon BN_MONT_CTX_free(group->field_data1); 243160814Ssimon group->field_data1 = NULL; 244160814Ssimon BN_free(group->field_data2); 245160814Ssimon group->field_data2 = NULL; 246160814Ssimon } 247160814Ssimon 248160814Ssimon err: 249160814Ssimon if (new_ctx != NULL) 250160814Ssimon BN_CTX_free(new_ctx); 251160814Ssimon if (mont != NULL) 252160814Ssimon BN_MONT_CTX_free(mont); 253160814Ssimon return ret; 254160814Ssimon } 255160814Ssimon 256160814Ssimon 257109998Smarkmint ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 258109998Smarkm { 259109998Smarkm if (group->field_data1 == NULL) 260109998Smarkm { 261109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 262109998Smarkm return 0; 263109998Smarkm } 264109998Smarkm 265109998Smarkm return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 266109998Smarkm } 267109998Smarkm 268109998Smarkm 269109998Smarkmint ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 270109998Smarkm { 271109998Smarkm if (group->field_data1 == NULL) 272109998Smarkm { 273109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 274109998Smarkm return 0; 275109998Smarkm } 276109998Smarkm 277109998Smarkm return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 278109998Smarkm } 279109998Smarkm 280109998Smarkm 281109998Smarkmint ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 282109998Smarkm { 283109998Smarkm if (group->field_data1 == NULL) 284109998Smarkm { 285109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 286109998Smarkm return 0; 287109998Smarkm } 288109998Smarkm 289109998Smarkm return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 290109998Smarkm } 291109998Smarkm 292109998Smarkm 293109998Smarkmint ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 294109998Smarkm { 295109998Smarkm if (group->field_data1 == NULL) 296109998Smarkm { 297109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 298109998Smarkm return 0; 299109998Smarkm } 300109998Smarkm 301109998Smarkm return BN_from_montgomery(r, a, group->field_data1, ctx); 302109998Smarkm } 303109998Smarkm 304109998Smarkm 305109998Smarkmint ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) 306109998Smarkm { 307109998Smarkm if (group->field_data2 == NULL) 308109998Smarkm { 309160814Ssimon ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 310109998Smarkm return 0; 311109998Smarkm } 312109998Smarkm 313109998Smarkm if (!BN_copy(r, group->field_data2)) return 0; 314109998Smarkm return 1; 315109998Smarkm } 316