ecp_mont.c revision 109998
1109998Smarkm/* crypto/ec/ecp_mont.c */ 2109998Smarkm/* ==================================================================== 3109998Smarkm * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 4109998Smarkm * 5109998Smarkm * Redistribution and use in source and binary forms, with or without 6109998Smarkm * modification, are permitted provided that the following conditions 7109998Smarkm * are met: 8109998Smarkm * 9109998Smarkm * 1. Redistributions of source code must retain the above copyright 10109998Smarkm * notice, this list of conditions and the following disclaimer. 11109998Smarkm * 12109998Smarkm * 2. Redistributions in binary form must reproduce the above copyright 13109998Smarkm * notice, this list of conditions and the following disclaimer in 14109998Smarkm * the documentation and/or other materials provided with the 15109998Smarkm * distribution. 16109998Smarkm * 17109998Smarkm * 3. All advertising materials mentioning features or use of this 18109998Smarkm * software must display the following acknowledgment: 19109998Smarkm * "This product includes software developed by the OpenSSL Project 20109998Smarkm * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 21109998Smarkm * 22109998Smarkm * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23109998Smarkm * endorse or promote products derived from this software without 24109998Smarkm * prior written permission. For written permission, please contact 25109998Smarkm * openssl-core@openssl.org. 26109998Smarkm * 27109998Smarkm * 5. Products derived from this software may not be called "OpenSSL" 28109998Smarkm * nor may "OpenSSL" appear in their names without prior written 29109998Smarkm * permission of the OpenSSL Project. 30109998Smarkm * 31109998Smarkm * 6. Redistributions of any form whatsoever must retain the following 32109998Smarkm * acknowledgment: 33109998Smarkm * "This product includes software developed by the OpenSSL Project 34109998Smarkm * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 35109998Smarkm * 36109998Smarkm * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37109998Smarkm * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38109998Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39109998Smarkm * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40109998Smarkm * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41109998Smarkm * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42109998Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43109998Smarkm * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44109998Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45109998Smarkm * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46109998Smarkm * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47109998Smarkm * OF THE POSSIBILITY OF SUCH DAMAGE. 48109998Smarkm * ==================================================================== 49109998Smarkm * 50109998Smarkm * This product includes cryptographic software written by Eric Young 51109998Smarkm * (eay@cryptsoft.com). This product includes software written by Tim 52109998Smarkm * Hudson (tjh@cryptsoft.com). 53109998Smarkm * 54109998Smarkm */ 55109998Smarkm 56109998Smarkm#include <openssl/err.h> 57109998Smarkm 58109998Smarkm#include "ec_lcl.h" 59109998Smarkm 60109998Smarkm 61109998Smarkmconst EC_METHOD *EC_GFp_mont_method(void) 62109998Smarkm { 63109998Smarkm static const EC_METHOD ret = { 64109998Smarkm ec_GFp_mont_group_init, 65109998Smarkm ec_GFp_mont_group_finish, 66109998Smarkm ec_GFp_mont_group_clear_finish, 67109998Smarkm ec_GFp_mont_group_copy, 68109998Smarkm ec_GFp_mont_group_set_curve_GFp, 69109998Smarkm ec_GFp_simple_group_get_curve_GFp, 70109998Smarkm ec_GFp_simple_group_set_generator, 71109998Smarkm ec_GFp_simple_group_get0_generator, 72109998Smarkm ec_GFp_simple_group_get_order, 73109998Smarkm ec_GFp_simple_group_get_cofactor, 74109998Smarkm ec_GFp_simple_point_init, 75109998Smarkm ec_GFp_simple_point_finish, 76109998Smarkm ec_GFp_simple_point_clear_finish, 77109998Smarkm ec_GFp_simple_point_copy, 78109998Smarkm ec_GFp_simple_point_set_to_infinity, 79109998Smarkm ec_GFp_simple_set_Jprojective_coordinates_GFp, 80109998Smarkm ec_GFp_simple_get_Jprojective_coordinates_GFp, 81109998Smarkm ec_GFp_simple_point_set_affine_coordinates_GFp, 82109998Smarkm ec_GFp_simple_point_get_affine_coordinates_GFp, 83109998Smarkm ec_GFp_simple_set_compressed_coordinates_GFp, 84109998Smarkm ec_GFp_simple_point2oct, 85109998Smarkm ec_GFp_simple_oct2point, 86109998Smarkm ec_GFp_simple_add, 87109998Smarkm ec_GFp_simple_dbl, 88109998Smarkm ec_GFp_simple_invert, 89109998Smarkm ec_GFp_simple_is_at_infinity, 90109998Smarkm ec_GFp_simple_is_on_curve, 91109998Smarkm ec_GFp_simple_cmp, 92109998Smarkm ec_GFp_simple_make_affine, 93109998Smarkm ec_GFp_simple_points_make_affine, 94109998Smarkm ec_GFp_mont_field_mul, 95109998Smarkm ec_GFp_mont_field_sqr, 96109998Smarkm ec_GFp_mont_field_encode, 97109998Smarkm ec_GFp_mont_field_decode, 98109998Smarkm ec_GFp_mont_field_set_to_one }; 99109998Smarkm 100109998Smarkm return &ret; 101109998Smarkm } 102109998Smarkm 103109998Smarkm 104109998Smarkmint ec_GFp_mont_group_init(EC_GROUP *group) 105109998Smarkm { 106109998Smarkm int ok; 107109998Smarkm 108109998Smarkm ok = ec_GFp_simple_group_init(group); 109109998Smarkm group->field_data1 = NULL; 110109998Smarkm group->field_data2 = NULL; 111109998Smarkm return ok; 112109998Smarkm } 113109998Smarkm 114109998Smarkm 115109998Smarkmint ec_GFp_mont_group_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 116109998Smarkm { 117109998Smarkm BN_CTX *new_ctx = NULL; 118109998Smarkm BN_MONT_CTX *mont = NULL; 119109998Smarkm BIGNUM *one = NULL; 120109998Smarkm int ret = 0; 121109998Smarkm 122109998Smarkm if (group->field_data1 != NULL) 123109998Smarkm { 124109998Smarkm BN_MONT_CTX_free(group->field_data1); 125109998Smarkm group->field_data1 = NULL; 126109998Smarkm } 127109998Smarkm if (group->field_data2 != NULL) 128109998Smarkm { 129109998Smarkm BN_free(group->field_data2); 130109998Smarkm group->field_data2 = NULL; 131109998Smarkm } 132109998Smarkm 133109998Smarkm if (ctx == NULL) 134109998Smarkm { 135109998Smarkm ctx = new_ctx = BN_CTX_new(); 136109998Smarkm if (ctx == NULL) 137109998Smarkm return 0; 138109998Smarkm } 139109998Smarkm 140109998Smarkm mont = BN_MONT_CTX_new(); 141109998Smarkm if (mont == NULL) goto err; 142109998Smarkm if (!BN_MONT_CTX_set(mont, p, ctx)) 143109998Smarkm { 144109998Smarkm ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE_GFP, ERR_R_BN_LIB); 145109998Smarkm goto err; 146109998Smarkm } 147109998Smarkm one = BN_new(); 148109998Smarkm if (one == NULL) goto err; 149109998Smarkm if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err; 150109998Smarkm 151109998Smarkm group->field_data1 = mont; 152109998Smarkm mont = NULL; 153109998Smarkm group->field_data2 = one; 154109998Smarkm one = NULL; 155109998Smarkm 156109998Smarkm ret = ec_GFp_simple_group_set_curve_GFp(group, p, a, b, ctx); 157109998Smarkm 158109998Smarkm if (!ret) 159109998Smarkm { 160109998Smarkm BN_MONT_CTX_free(group->field_data1); 161109998Smarkm group->field_data1 = NULL; 162109998Smarkm BN_free(group->field_data2); 163109998Smarkm group->field_data2 = NULL; 164109998Smarkm } 165109998Smarkm 166109998Smarkm err: 167109998Smarkm if (new_ctx != NULL) 168109998Smarkm BN_CTX_free(new_ctx); 169109998Smarkm if (mont != NULL) 170109998Smarkm BN_MONT_CTX_free(mont); 171109998Smarkm return ret; 172109998Smarkm } 173109998Smarkm 174109998Smarkm 175109998Smarkmvoid ec_GFp_mont_group_finish(EC_GROUP *group) 176109998Smarkm { 177109998Smarkm if (group->field_data1 != NULL) 178109998Smarkm { 179109998Smarkm BN_MONT_CTX_free(group->field_data1); 180109998Smarkm group->field_data1 = NULL; 181109998Smarkm } 182109998Smarkm if (group->field_data2 != NULL) 183109998Smarkm { 184109998Smarkm BN_free(group->field_data2); 185109998Smarkm group->field_data2 = NULL; 186109998Smarkm } 187109998Smarkm ec_GFp_simple_group_finish(group); 188109998Smarkm } 189109998Smarkm 190109998Smarkm 191109998Smarkmvoid ec_GFp_mont_group_clear_finish(EC_GROUP *group) 192109998Smarkm { 193109998Smarkm if (group->field_data1 != NULL) 194109998Smarkm { 195109998Smarkm BN_MONT_CTX_free(group->field_data1); 196109998Smarkm group->field_data1 = NULL; 197109998Smarkm } 198109998Smarkm if (group->field_data2 != NULL) 199109998Smarkm { 200109998Smarkm BN_clear_free(group->field_data2); 201109998Smarkm group->field_data2 = NULL; 202109998Smarkm } 203109998Smarkm ec_GFp_simple_group_clear_finish(group); 204109998Smarkm } 205109998Smarkm 206109998Smarkm 207109998Smarkmint ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 208109998Smarkm { 209109998Smarkm if (dest->field_data1 != NULL) 210109998Smarkm { 211109998Smarkm BN_MONT_CTX_free(dest->field_data1); 212109998Smarkm dest->field_data1 = NULL; 213109998Smarkm } 214109998Smarkm if (dest->field_data2 != NULL) 215109998Smarkm { 216109998Smarkm BN_clear_free(dest->field_data2); 217109998Smarkm dest->field_data2 = NULL; 218109998Smarkm } 219109998Smarkm 220109998Smarkm if (!ec_GFp_simple_group_copy(dest, src)) return 0; 221109998Smarkm 222109998Smarkm if (src->field_data1 != NULL) 223109998Smarkm { 224109998Smarkm dest->field_data1 = BN_MONT_CTX_new(); 225109998Smarkm if (dest->field_data1 == NULL) return 0; 226109998Smarkm if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err; 227109998Smarkm } 228109998Smarkm if (src->field_data2 != NULL) 229109998Smarkm { 230109998Smarkm dest->field_data2 = BN_dup(src->field_data2); 231109998Smarkm if (dest->field_data2 == NULL) goto err; 232109998Smarkm } 233109998Smarkm 234109998Smarkm return 1; 235109998Smarkm 236109998Smarkm err: 237109998Smarkm if (dest->field_data1 != NULL) 238109998Smarkm { 239109998Smarkm BN_MONT_CTX_free(dest->field_data1); 240109998Smarkm dest->field_data1 = NULL; 241109998Smarkm } 242109998Smarkm return 0; 243109998Smarkm } 244109998Smarkm 245109998Smarkm 246109998Smarkmint ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 247109998Smarkm { 248109998Smarkm if (group->field_data1 == NULL) 249109998Smarkm { 250109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 251109998Smarkm return 0; 252109998Smarkm } 253109998Smarkm 254109998Smarkm return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 255109998Smarkm } 256109998Smarkm 257109998Smarkm 258109998Smarkmint ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 259109998Smarkm { 260109998Smarkm if (group->field_data1 == NULL) 261109998Smarkm { 262109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 263109998Smarkm return 0; 264109998Smarkm } 265109998Smarkm 266109998Smarkm return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 267109998Smarkm } 268109998Smarkm 269109998Smarkm 270109998Smarkmint ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 271109998Smarkm { 272109998Smarkm if (group->field_data1 == NULL) 273109998Smarkm { 274109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 275109998Smarkm return 0; 276109998Smarkm } 277109998Smarkm 278109998Smarkm return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 279109998Smarkm } 280109998Smarkm 281109998Smarkm 282109998Smarkmint ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 283109998Smarkm { 284109998Smarkm if (group->field_data1 == NULL) 285109998Smarkm { 286109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 287109998Smarkm return 0; 288109998Smarkm } 289109998Smarkm 290109998Smarkm return BN_from_montgomery(r, a, group->field_data1, ctx); 291109998Smarkm } 292109998Smarkm 293109998Smarkm 294109998Smarkmint ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) 295109998Smarkm { 296109998Smarkm if (group->field_data2 == NULL) 297109998Smarkm { 298109998Smarkm ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 299109998Smarkm return 0; 300109998Smarkm } 301109998Smarkm 302109998Smarkm if (!BN_copy(r, group->field_data2)) return 0; 303109998Smarkm return 1; 304109998Smarkm } 305