ec_asn1.c

OpenSSL 0.9.8k 最新版OpenSSL

/* crypto/ec/ec_asn1.c */
/*
 * Written by Nils Larsch for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 2000-2003 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
 *    [e-mail].
 *
 * 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
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#include <string.h>
#include "ec_lcl.h"
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>


int EC_GROUP_get_basis_type(const EC_GROUP *group)
	{
	int i=0;

	if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
		NID_X9_62_characteristic_two_field)
		/* everything else is currently not supported */
		return 0;

	while (group->poly[i] != 0)
		i++;

	if (i == 4)
		return NID_X9_62_ppBasis;
	else if (i == 2)
		return NID_X9_62_tpBasis;
	else
		/* everything else is currently not supported */
		return 0;
	}

int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
	{
	if (group == NULL)
		return 0;

	if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
	    || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0)))
		{
		ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
		}

	if (k)
		*k = group->poly[1];

	return 1;
	}

int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
	unsigned int *k2, unsigned int *k3)
	{
	if (group == NULL)
		return 0;

	if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
	    || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0)))
		{
		ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return 0;
		}

	if (k1)
		*k1 = group->poly[3];
	if (k2)
		*k2 = group->poly[2];
	if (k3)
		*k3 = group->poly[1];

	return 1;
	}



/* some structures needed for the asn1 encoding */
typedef struct x9_62_pentanomial_st {
	long k1;
	long k2;
	long k3;
	} X9_62_PENTANOMIAL;

typedef struct x9_62_characteristic_two_st {
	long m;
	ASN1_OBJECT  *type;
	union	{
		char *ptr;
		/* NID_X9_62_onBasis */
		ASN1_NULL    *onBasis;
		/* NID_X9_62_tpBasis */
		ASN1_INTEGER *tpBasis;
		/* NID_X9_62_ppBasis */
		X9_62_PENTANOMIAL *ppBasis;
		/* anything else */
		ASN1_TYPE *other;
		} p;
	} X9_62_CHARACTERISTIC_TWO;

typedef struct x9_62_fieldid_st {
        ASN1_OBJECT *fieldType;
	union	{
		char *ptr;
		/* NID_X9_62_prime_field */
		ASN1_INTEGER *prime;
		/* NID_X9_62_characteristic_two_field */
		X9_62_CHARACTERISTIC_TWO *char_two;
		/* anything else */
		ASN1_TYPE *other;
		} p;
	} X9_62_FIELDID;

typedef struct x9_62_curve_st {
        ASN1_OCTET_STRING *a;
        ASN1_OCTET_STRING *b;
        ASN1_BIT_STRING   *seed;
        } X9_62_CURVE;

typedef struct ec_parameters_st {
        long              version;
        X9_62_FIELDID     *fieldID;
        X9_62_CURVE       *curve;
        ASN1_OCTET_STRING *base;
        ASN1_INTEGER      *order;
        ASN1_INTEGER      *cofactor;
        } ECPARAMETERS;

struct ecpk_parameters_st {
	int	type;
	union {
		ASN1_OBJECT  *named_curve;
		ECPARAMETERS *parameters;
		ASN1_NULL    *implicitlyCA;
	} value;
	}/* ECPKPARAMETERS */;

/* SEC1 ECPrivateKey */
typedef struct ec_privatekey_st {
	long              version;
	ASN1_OCTET_STRING *privateKey;
        ECPKPARAMETERS    *parameters;
	ASN1_BIT_STRING   *publicKey;
	} EC_PRIVATEKEY;

/* the OpenSSL ASN.1 definitions */
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
	ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
	ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
	ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
} ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)

DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)

ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);

ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
	ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
	ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
	ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
} ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);

ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
	ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
	ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
	ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
} ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)

DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)

ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);

ASN1_ADB(X9_62_FIELDID) = {
	ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
	ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);

ASN1_SEQUENCE(X9_62_FIELDID) = {
	ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
	ASN1_ADB_OBJECT(X9_62_FIELDID)
} ASN1_SEQUENCE_END(X9_62_FIELDID)

ASN1_SEQUENCE(X9_62_CURVE) = {
	ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
	ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
	ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(X9_62_CURVE)

ASN1_SEQUENCE(ECPARAMETERS) = {
	ASN1_SIMPLE(ECPARAMETERS, version, LONG),
	ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
	ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
	ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
	ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
	ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)

DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)

ASN1_CHOICE(ECPKPARAMETERS) = {
	ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
	ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
	ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
} ASN1_CHOICE_END(ECPKPARAMETERS)

DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)

ASN1_SEQUENCE(EC_PRIVATEKEY) = {
	ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
	ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
	ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
	ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
} ASN1_SEQUENCE_END(EC_PRIVATEKEY)

DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)

/* some declarations of internal function */

/* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */ 
static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
/* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */ 
static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
/* ec_asn1_parameters2group() creates a EC_GROUP object from a
 * ECPARAMETERS object */
static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *); 
/* ec_asn1_group2parameters() creates a ECPARAMETERS object from a 
 * EC_GROUP object */
static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *);
/* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
 * ECPKPARAMETERS object */
static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *); 
/* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a 
 * EC_GROUP object */
static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *, 
	ECPKPARAMETERS *);


/* the function definitions */

static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
	{
	int			ok=0, nid;
	BIGNUM			*tmp = NULL;
	
	if (group == NULL || field == NULL)
		return 0;

	/* clear the old values (if necessary) */
	if (field->fieldType != NULL)
		ASN1_OBJECT_free(field->fieldType);
	if (field->p.other != NULL)
		ASN1_TYPE_free(field->p.other);

	nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
	/* set OID for the field */
	if ((field->fieldType = OBJ_nid2obj(nid)) == NULL)
		{
		ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
		goto err;
		}

	if (nid == NID_X9_62_prime_field)
		{
		if ((tmp = BN_new()) == NULL) 
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
			goto err;
			}
		/* the parameters are specified by the prime number p */
		if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
			goto err;
			}
		/* set the prime number */
		field->p.prime = BN_to_ASN1_INTEGER(tmp,NULL);
		if (field->p.prime == NULL)
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
			goto err;
			}
		}
	else	/* nid == NID_X9_62_characteristic_two_field */
		{
		int		field_type;
		X9_62_CHARACTERISTIC_TWO *char_two;

		field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
		char_two = field->p.char_two;

		if (char_two == NULL)
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
			goto err;
			}
	
		char_two->m = (long)EC_GROUP_get_degree(group);

		field_type = EC_GROUP_get_basis_type(group);

		if (field_type == 0)
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
			goto err;
			}
		/* set base type OID */
		if ((char_two->type = OBJ_nid2obj(field_type)) == NULL)
			{
			ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
			goto err;
			}

		if (field_type == NID_X9_62_tpBasis)
			{
			unsigned int k;

			if (!EC_GROUP_get_trinomial_basis(group, &k))
				goto err;

			char_two->p.tpBasis = ASN1_INTEGER_new();
			if (!char_two->p.tpBasis)
				{
				ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
				goto err;
				}
			if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k))
				{
				ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
					ERR_R_ASN1_LIB);
				goto err;
				}
			}
		else if (field_type == NID_X9_62_ppBasis)
			{
			unsigned int k1, k2, k3;

			if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
				goto err;

			char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
			if (!char_two->p.ppBasis)
				{
				ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
				goto err;
				}

			/* set k? values */
			char_two->p.ppBasis->k1 = (long)k1;
			char_two->p.ppBasis->k2 = (long)k2;
			char_two->p.ppBasis->k3 = (long)k3;
			}
		else /* field_type == NID_X9_62_onBasis */
			{
			/* for ONB the parameters are (asn1) NULL */
			char_two->p.onBasis = ASN1_NULL_new();
			if (!char_two->p.onBasis)
				{
				ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
				goto err;
				}
			}
		}

	ok = 1;

err :	if (tmp)
		BN_free(tmp);
	return(ok);
}

static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
	{
	int           ok=0, nid;
	BIGNUM        *tmp_1=NULL, *tmp_2=NULL;
	unsigned char *buffer_1=NULL, *buffer_2=NULL,
	              *a_buf=NULL, *b_buf=NULL;
	size_t        len_1, len_2;
	unsigned char char_zero = 0;

	if (!group || !curve || !curve->a || !curve->b)
		return 0;

	if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
		{
		ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
		goto err;
		}

	nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));

	/* get a and b */
	if (nid == NID_X9_62_prime_field)
		{
		if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL))
			{
			ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
			goto err;
			}
		}
	else	/* nid == NID_X9_62_characteristic_two_field */
		{
		if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL))
			{
			ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
			goto err;
			}
		}

	len_1 = (size_t)BN_num_bytes(tmp_1);
	len_2 = (size_t)BN_num_bytes(tmp_2);

	if (len_1 == 0)
		{
		/* len_1 == 0 => a == 0 */
		a_buf = &char_zero;
		len_1 = 1;
		}
	else