/* crypto/ec/ecp_nist.c */ /* * Written by Nils Larsch for the OpenSSL project. */ /* ==================================================================== * Copyright (c) 1998-2002 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 #include "ec_lcl.h" const EC_METHOD *EC_GFp_nist_method(void) { static const EC_METHOD ret = { NID_X9_62_prime_field, ec_GFp_nist_group_init, ec_GFp_nist_group_finish, ec_GFp_nist_group_clear_finish, ec_GFp_nist_group_copy, ec_GFp_nist_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, ec_GFp_simple_set_compressed_coordinates, ec_GFp_simple_point2oct, ec_GFp_simple_oct2point, ec_GFp_simple_add, ec_GFp_simple_dbl, ec_GFp_simple_invert, 0 /* mul */, 0 /* precompute_mult */, 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, ec_GFp_nist_field_mul, ec_GFp_nist_field_sqr, 0 /* field_div */, 0 /* field_encode */, 0 /* field_decode */, 0 /* field_set_to_one */ }; return &ret; } #define ECP_MOD_CAST \ (int (*)(BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *)) #if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL #define NO_32_BIT_TYPE #endif int ec_GFp_nist_group_init(EC_GROUP *group) { int ok; ok = ec_GFp_simple_group_init(group); group->field_data1 = NULL; return ok; } void ec_GFp_nist_group_finish(EC_GROUP *group) { BN_free(&group->field); BN_free(&group->a); BN_free(&group->b); } void ec_GFp_nist_group_clear_finish(EC_GROUP *group) { BN_clear_free(&group->field); BN_clear_free(&group->a); BN_clear_free(&group->b); } int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { int ret = 0; BN_CTX *new_ctx = NULL; BIGNUM *tmp_bn; if (ctx == NULL) if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0; BN_CTX_start(ctx); if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err; if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) group->field_data1 = (void *)BN_nist_mod_192; else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) #if !defined(ECP_NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM) group->field_data1 = (void *)BN_nist_mod_224; #else goto err; #endif else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) #if !defined(ECP_NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM) group->field_data1 = (void *)BN_nist_mod_256; #else goto err; #endif else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) #if !defined(ECP_NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM) group->field_data1 = (void *)BN_nist_mod_384; #else goto err; #endif else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) group->field_data1 = (void *)BN_nist_mod_521; else { ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_PRIME_IS_NOT_A_NIST_PRIME); goto err; } /* group->field */ if (!BN_copy(&group->field, p)) goto err; group->field.neg = 0; /* group->a */ (ECP_MOD_CAST group->field_data1)(&group->a, a, p, ctx); /* group->b */ (ECP_MOD_CAST group->field_data1)(&group->b, b, p, ctx); /* group->a_is_minus3 */ if (!BN_add_word(tmp_bn, 3)) goto err; group->a_is_minus3 = (0 == BN_cmp(tmp_bn, &group->field)); ret = 1; err: BN_CTX_end(ctx); if (new_ctx != NULL) BN_CTX_free(new_ctx); return ret; } int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src) { if (dest == NULL || src == NULL) return 0; if (!BN_copy(&dest->field, &src->field)) return 0; if (!BN_copy(&dest->a, &src->a)) return 0; if (!BN_copy(&dest->b, &src->b)) return 0; dest->curve_name = src->curve_name; dest->a_is_minus3 = src->a_is_minus3; dest->field_data1 = src->field_data1; return 1; } int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { int ret=0; BN_CTX *ctx_new=NULL; if (!group || !r || !a || !b) { ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER); goto err; } if (!ctx) if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; if (!BN_mul(r, a, b, ctx)) goto err; if (!(ECP_MOD_CAST group->field_data1)(r, r, &group->field, ctx)) goto err; ret=1; err: if (ctx_new) BN_CTX_free(ctx_new); return ret; } int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) { int ret=0; BN_CTX *ctx_new=NULL; if (!group || !r || !a) { ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER); goto err; } if (!ctx) if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err; if (!BN_sqr(r, a, ctx)) goto err; if (!(ECP_MOD_CAST group->field_data1)(r, r, &group->field, ctx)) goto err; ret=1; err: if (ctx_new) BN_CTX_free(ctx_new); return ret; }