/* crypto/ec/ecp_mont.c */ /* * Originally written by Bodo Moeller for the OpenSSL project. */ /* ==================================================================== * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * Portions of this software developed by SUN MICROSYSTEMS, INC., * and contributed to the OpenSSL project. */ #include #include "ec_lcl.h" const EC_METHOD *EC_GFp_mont_method(void) { static const EC_METHOD ret = { EC_FLAGS_DEFAULT_OCT, NID_X9_62_prime_field, ec_GFp_mont_group_init, ec_GFp_mont_group_finish, ec_GFp_mont_group_clear_finish, ec_GFp_mont_group_copy, ec_GFp_mont_group_set_curve, ec_GFp_simple_group_get_curve, ec_GFp_simple_group_get_degree, ec_GFp_simple_group_check_discriminant, ec_GFp_simple_point_init, ec_GFp_simple_point_finish, ec_GFp_simple_point_clear_finish, ec_GFp_simple_point_copy, ec_GFp_simple_point_set_to_infinity, ec_GFp_simple_set_Jprojective_coordinates_GFp, ec_GFp_simple_get_Jprojective_coordinates_GFp, ec_GFp_simple_point_set_affine_coordinates, ec_GFp_simple_point_get_affine_coordinates, 0,0,0, ec_GFp_simple_add, ec_GFp_simple_dbl, ec_GFp_simple_invert, ec_GFp_simple_is_at_infinity, ec_GFp_simple_is_on_curve, ec_GFp_simple_cmp, ec_GFp_simple_make_affine, ec_GFp_simple_points_make_affine, 0 /* mul */, 0 /* precompute_mult */, 0 /* have_precompute_mult */, ec_GFp_mont_field_mul, ec_GFp_mont_field_sqr, 0 /* field_div */, ec_GFp_mont_field_encode, ec_GFp_mont_field_decode, ec_GFp_mont_field_set_to_one }; return &ret; } int ec_GFp_mont_group_init(EC_GROUP *group) { int ok; ok = ec_GFp_simple_group_init(group); group->field_data1 = NULL; group->field_data2 = NULL; return ok; } void ec_GFp_mont_group_finish(EC_GROUP *group) { if (group->field_data1 != NULL) { BN_MONT_CTX_free(group->field_data1); group->field_data1 = NULL; } if (group->field_data2 != NULL) { BN_free(group->field_data2); group->field_data2 = NULL; } ec_GFp_simple_group_finish(group); } void ec_GFp_mont_group_clear_finish(EC_GROUP *group) { if (group->field_data1 != NULL) { BN_MONT_CTX_free(group->field_data1); group->field_data1 = NULL; } if (group->field_data2 != NULL) { BN_clear_free(group->field_data2); group->field_data2 = NULL; } ec_GFp_simple_group_clear_finish(group); } int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) { if (dest->field_data1 != NULL) { BN_MONT_CTX_free(dest->field_data1); dest->field_data1 = NULL; } if (dest->field_data2 != NULL) { BN_clear_free(dest->field_data2); dest->field_data2 = NULL; } if (!ec_GFp_simple_group_copy(dest, src)) return 0; if (src->field_data1 != NULL) { dest->field_data1 = BN_MONT_CTX_new(); if (dest->field_data1 == NULL) return 0; if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err; } if (src->field_data2 != NULL) { dest->field_data2 = BN_dup(src->field_data2); if (dest->field_data2 == NULL) goto err; } return 1; err: if (dest->field_data1 != NULL) { BN_MONT_CTX_free(dest->field_data1); dest->field_data1 = NULL; } return 0; } int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { BN_CTX *new_ctx = NULL; BN_MONT_CTX *mont = NULL; BIGNUM *one = NULL; int ret = 0; if (group->field_data1 != NULL) { BN_MONT_CTX_free(group->field_data1); group->field_data1 = NULL; } if (group->field_data2 != NULL) { BN_free(group->field_data2); group->field_data2 = NULL; } if (ctx == NULL) { ctx = new_ctx = BN_CTX_new(); if (ctx == NULL) return 0; } mont = BN_MONT_CTX_new(); if (mont == NULL) goto err; if (!BN_MONT_CTX_set(mont, p, ctx)) { ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); goto err; } one = BN_new(); if (one == NULL) goto err; if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err; group->field_data1 = mont; mont = NULL; group->field_data2 = one; one = NULL; ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); if (!ret) { BN_MONT_CTX_free(group->field_data1); group->field_data1 = NULL; BN_free(group->field_data2); group->field_data2 = NULL; } err: if (new_ctx != NULL) BN_CTX_free(new_ctx); if (mont != NULL) BN_MONT_CTX_free(mont); return ret; } int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { if (group->field_data1 == NULL) { ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); return 0; } return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); } int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) { if (group->field_data1 == NULL) { ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); return 0; } return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); } int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) { if (group->field_data1 == NULL) { ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); return 0; } return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); } int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) { if (group->field_data1 == NULL) { ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); return 0; } return BN_from_montgomery(r, a, group->field_data1, ctx); } int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) { if (group->field_data2 == NULL) { ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); return 0; } if (!BN_copy(r, group->field_data2)) return 0; return 1; }