/* crypto/ecdsa/ecs_lib.c */

/* ====================================================================

 * Copyright (c) 1998-2005 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).

 *

 */

#include <string.h>

#include "ecs_locl.h"

#ifndef OPENSSL_NO_ENGINE

# include <openssl/engine.h>

#endif

#include <openssl/err.h>

#include <openssl/bn.h>

#ifdef OPENSSL_FIPS

# include <openssl/fips.h>

#endif

const char ECDSA_version[] = "ECDSA" OPENSSL_VERSION_PTEXT;

static const ECDSA_METHOD *default_ECDSA_method = NULL;

static void *ecdsa_data_new(void);

static void *ecdsa_data_dup(void *);

static void ecdsa_data_free(void *);

void ECDSA_set_default_method(const ECDSA_METHOD *meth)

{

    default_ECDSA_method = meth;

}

const ECDSA_METHOD *ECDSA_get_default_method(void)

{

    if (!default_ECDSA_method) {

#ifdef OPENSSL_FIPS

        if (FIPS_mode())

            return FIPS_ecdsa_openssl();

        else

            return ECDSA_OpenSSL();

#else

        default_ECDSA_method = ECDSA_OpenSSL();

#endif

    }

    return default_ECDSA_method;

}

int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)

{

    ECDSA_DATA *ecdsa;

    ecdsa = ecdsa_check(eckey);

    if (ecdsa == NULL)

        return 0;

#ifndef OPENSSL_NO_ENGINE

    if (ecdsa->engine) {

        ENGINE_finish(ecdsa->engine);

        ecdsa->engine = NULL;

    }

#endif

    ecdsa->meth = meth;

    return 1;

}

static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)

{

    ECDSA_DATA *ret;

    ret = (ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));

    if (ret == NULL) {

        ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);

        return (NULL);

    }

    ret->init = NULL;

    ret->meth = ECDSA_get_default_method();

    ret->engine = engine;

#ifndef OPENSSL_NO_ENGINE

    if (!ret->engine)

        ret->engine = ENGINE_get_default_ECDSA();

    if (ret->engine) {

        ret->meth = ENGINE_get_ECDSA(ret->engine);

        if (!ret->meth) {

            ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);

            ENGINE_finish(ret->engine);

            OPENSSL_free(ret);

            return NULL;

        }

    }

#endif

    ret->flags = ret->meth->flags;

    CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);

#if 0

    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {

        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);

        OPENSSL_free(ret);

        ret = NULL;

    }

#endif

    return (ret);

}

static void *ecdsa_data_new(void)

{

    return (void *)ECDSA_DATA_new_method(NULL);

}

static void *ecdsa_data_dup(void *data)

{

    ECDSA_DATA *r = (ECDSA_DATA *)data;

    /* XXX: dummy operation */

    if (r == NULL)

        return NULL;

    return ecdsa_data_new();

}

static void ecdsa_data_free(void *data)

{

    ECDSA_DATA *r = (ECDSA_DATA *)data;

#ifndef OPENSSL_NO_ENGINE

    if (r->engine)

        ENGINE_finish(r->engine);

#endif

    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);

    OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));

    OPENSSL_free(r);

}

ECDSA_DATA *ecdsa_check(EC_KEY *key)

{

    ECDSA_DATA *ecdsa_data;

    void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,

                                            ecdsa_data_free, ecdsa_data_free);

    if (data == NULL) {

        ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();

        if (ecdsa_data == NULL)

            return NULL;

        data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,

                                             ecdsa_data_dup, ecdsa_data_free,

                                             ecdsa_data_free);

        if (data != NULL) {

            /*

             * Another thread raced us to install the key_method data and

             * won.

             */

            ecdsa_data_free(ecdsa_data);

            ecdsa_data = (ECDSA_DATA *)data;

        } else if (EC_KEY_get_key_method_data(key, ecdsa_data_dup,

                                              ecdsa_data_free,

                                              ecdsa_data_free) != ecdsa_data) {

            /* Or an out of memory error in EC_KEY_insert_key_method_data. */

            ecdsa_data_free(ecdsa_data);

            return NULL;

        }

    } else {

        ecdsa_data = (ECDSA_DATA *)data;

    }

#ifdef OPENSSL_FIPS

    if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD)

        && !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) {

        ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD);

        return NULL;

    }

#endif

    return ecdsa_data;

}

int ECDSA_size(const EC_KEY *r)

{

    int ret, i;

    ASN1_INTEGER bs;

    BIGNUM *order = NULL;

    unsigned char buf[4];

    const EC_GROUP *group;

    if (r == NULL)

        return 0;

    group = EC_KEY_get0_group(r);

    if (group == NULL)

        return 0;

    if ((order = BN_new()) == NULL)

        return 0;

    if (!EC_GROUP_get_order(group, order, NULL)) {

        BN_clear_free(order);

        return 0;

    }

    i = BN_num_bits(order);

    bs.length = (i + 7) / 8;

    bs.data = buf;

    bs.type = V_ASN1_INTEGER;

    /* If the top bit is set the asn1 encoding is 1 larger. */

    buf[0] = 0xff;

    i = i2d_ASN1_INTEGER(&bs, NULL);

    i += i;                     /* r and s */

    ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);

    BN_clear_free(order);

    return (ret);

}

int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

                           CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

{

    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,

                                   new_func, dup_func, free_func);

}

int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)

{

    ECDSA_DATA *ecdsa;

    ecdsa = ecdsa_check(d);

    if (ecdsa == NULL)

        return 0;

    return (CRYPTO_set_ex_data(&ecdsa->ex_data, idx, arg));

}

void *ECDSA_get_ex_data(EC_KEY *d, int idx)

{

    ECDSA_DATA *ecdsa;

    ecdsa = ecdsa_check(d);

    if (ecdsa == NULL)

        return NULL;

    return (CRYPTO_get_ex_data(&ecdsa->ex_data, idx));

}

ECDSA_METHOD *ECDSA_METHOD_new(const ECDSA_METHOD *ecdsa_meth)

{

    ECDSA_METHOD *ret;

    ret = OPENSSL_malloc(sizeof(ECDSA_METHOD));

    if (ret == NULL) {

        ECDSAerr(ECDSA_F_ECDSA_METHOD_NEW, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    if (ecdsa_meth)

        *ret = *ecdsa_meth;

    else {

        ret->ecdsa_sign_setup = 0;

        ret->ecdsa_do_sign = 0;

        ret->ecdsa_do_verify = 0;

        ret->name = NULL;

        ret->flags = 0;

    }

    ret->flags |= ECDSA_METHOD_FLAG_ALLOCATED;

    return ret;

}

void ECDSA_METHOD_set_sign(ECDSA_METHOD *ecdsa_method,

                           ECDSA_SIG *(*ecdsa_do_sign) (const unsigned char

                                                        *dgst, int dgst_len,

                                                        const BIGNUM *inv,

                                                        const BIGNUM *rp,

                                                        EC_KEY *eckey))

{

    ecdsa_method->ecdsa_do_sign = ecdsa_do_sign;

}

void ECDSA_METHOD_set_sign_setup(ECDSA_METHOD *ecdsa_method,

                                 int (*ecdsa_sign_setup) (EC_KEY *eckey,

                                                          BN_CTX *ctx,

                                                          BIGNUM **kinv,

                                                          BIGNUM **r))

{

    ecdsa_method->ecdsa_sign_setup = ecdsa_sign_setup;

}

void ECDSA_METHOD_set_verify(ECDSA_METHOD *ecdsa_method,

                             int (*ecdsa_do_verify) (const unsigned char

                                                     *dgst, int dgst_len,

                                                     const ECDSA_SIG *sig,

                                                     EC_KEY *eckey))

{

    ecdsa_method->ecdsa_do_verify = ecdsa_do_verify;

}

void ECDSA_METHOD_set_flags(ECDSA_METHOD *ecdsa_method, int flags)

{

    ecdsa_method->flags = flags | ECDSA_METHOD_FLAG_ALLOCATED;

}

void ECDSA_METHOD_set_name(ECDSA_METHOD *ecdsa_method, char *name)

{

    ecdsa_method->name = name;

}

void ECDSA_METHOD_free(ECDSA_METHOD *ecdsa_method)

{

    if (ecdsa_method->flags & ECDSA_METHOD_FLAG_ALLOCATED)

        OPENSSL_free(ecdsa_method);

}

void ECDSA_METHOD_set_app_data(ECDSA_METHOD *ecdsa_method, void *app)

{

    ecdsa_method->app_data = app;

}

void *ECDSA_METHOD_get_app_data(ECDSA_METHOD *ecdsa_method)

{

    return ecdsa_method->app_data;

}