crypto/ec/ecp_mont.c - platform/external/openssl - Git at Google

 /* 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 <openssl/err.h>

 #ifdef OPENSSL_FIPS
 #include <openssl/fips.h>
 #endif

 #include "ec_lcl.h"


 const EC_METHOD *EC_GFp_mont_method(void)
 	{
 #ifdef OPENSSL_FIPS
 	return fips_ec_gfp_mont_method();
 #else
 	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;
 #endif
 	}


 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;
 	}
	/* 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 <openssl/err.h>

	#ifdef OPENSSL_FIPS
	#include <openssl/fips.h>
	#endif

	#include "ec_lcl.h"


	const EC_METHOD *EC_GFp_mont_method(void)
	{
	#ifdef OPENSSL_FIPS
	return fips_ec_gfp_mont_method();
	#else
	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;
	#endif
	}


	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;
	}