/*  $OpenBSD: ec_kmeth.c,v 1.6 2021/12/04 16:08:32 tb Exp $ */

/*

 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL

 * project.

 */

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

 * Copyright (c) 2015 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

 *    licensing@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.

 * ====================================================================

 */

#include <openssl/ec.h>

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#include <openssl/err.h>

#include "bn_lcl.h"

#include "ec_lcl.h"

#include "ecs_locl.h"

static const EC_KEY_METHOD openssl_ec_key_method = {

  .name = "OpenSSL EC_KEY method",

  .flags = 0,

  .init = NULL,

  .finish = NULL,

  .copy = NULL,

  .set_group = NULL,

  .set_private = NULL,

  .set_public = NULL,

  .keygen = ossl_ec_key_gen,

  .compute_key = ossl_ecdh_compute_key,

  .sign = ossl_ecdsa_sign,

  .sign_setup = ossl_ecdsa_sign_setup,

  .sign_sig = ossl_ecdsa_sign_sig,

  .verify = ossl_ecdsa_verify,

  .verify_sig = ossl_ecdsa_verify_sig,

};

const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;

const EC_KEY_METHOD *

EC_KEY_OpenSSL(void)

{

  return &openssl_ec_key_method;

}

const EC_KEY_METHOD *

EC_KEY_get_default_method(void)

{

  return default_ec_key_meth;

}

void

EC_KEY_set_default_method(const EC_KEY_METHOD *meth)

{

  if (meth == NULL)

    default_ec_key_meth = &openssl_ec_key_method;

  else

    default_ec_key_meth = meth;

}

const EC_KEY_METHOD *

EC_KEY_get_method(const EC_KEY *key)

{

  return key->meth;

}

int

EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)

{

  void (*finish)(EC_KEY *key) = key->meth->finish;

  if (finish != NULL)

    finish(key);

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(key->engine);

  key->engine = NULL;

#endif

  key->meth = meth;

  if (meth->init != NULL)

    return meth->init(key);

  return 1;

}

EC_KEY *

EC_KEY_new_method(ENGINE *engine)

{

  EC_KEY *ret;

  if ((ret = calloc(1, sizeof(EC_KEY))) == NULL) {

    ECerror(ERR_R_MALLOC_FAILURE);

    return NULL;

  }

  ret->meth = EC_KEY_get_default_method();

#ifndef OPENSSL_NO_ENGINE

  if (engine != NULL) {

    if (!ENGINE_init(engine)) {

      ECerror(ERR_R_ENGINE_LIB);

      goto err;

    }

    ret->engine = engine;

  } else

    ret->engine = ENGINE_get_default_EC();

  if (ret->engine) {

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

    if (ret->meth == NULL) {

      ECerror(ERR_R_ENGINE_LIB);

      goto err;

    }

  }

#endif

  ret->version = 1;

  ret->flags = 0;

  ret->group = NULL;

  ret->pub_key = NULL;

  ret->priv_key = NULL;

  ret->enc_flag = 0;

  ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;

  ret->references = 1;

  ret->method_data = NULL;

  if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data))

    goto err;

  if (ret->meth->init != NULL && ret->meth->init(ret) == 0)

    goto err;

  return ret;

 err:

  EC_KEY_free(ret);

  return NULL;

}

EC_KEY_METHOD *

EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)

{

  EC_KEY_METHOD *ret;

  if ((ret = calloc(1, sizeof(*meth))) == NULL)

    return NULL;

  if (meth != NULL)

    *ret = *meth;

  ret->flags |= EC_KEY_METHOD_DYNAMIC;

  return ret;

}

void

EC_KEY_METHOD_free(EC_KEY_METHOD *meth)

{

  if (meth == NULL)

    return;

  if (meth->flags & EC_KEY_METHOD_DYNAMIC)

    free(meth);

}

void

EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,

    int (*init)(EC_KEY *key),

    void (*finish)(EC_KEY *key),

    int (*copy)(EC_KEY *dest, const EC_KEY *src),

    int (*set_group)(EC_KEY *key, const EC_GROUP *grp),

    int (*set_private)(EC_KEY *key, const BIGNUM *priv_key),

    int (*set_public)(EC_KEY *key, const EC_POINT *pub_key))

{

  meth->init = init;

  meth->finish = finish;

  meth->copy = copy;

  meth->set_group = set_group;

  meth->set_private = set_private;

  meth->set_public = set_public;

}

void

EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth, int (*keygen)(EC_KEY *key))

{

  meth->keygen = keygen;

}

void

EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,

   int (*ckey)(void *out, size_t outlen, const EC_POINT *pub_key, EC_KEY *ecdh,

   void *(*KDF) (const void *in, size_t inlen, void *out, size_t *outlen)))

{

  meth->compute_key = ckey;

}

void

EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,

    int (*sign)(int type, const unsigned char *dgst,

  int dlen, unsigned char *sig, unsigned int *siglen,

  const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey),

    int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,

  BIGNUM **kinvp, BIGNUM **rp),

    ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,

  int dgst_len, const BIGNUM *in_kinv,

  const BIGNUM *in_r, EC_KEY *eckey))

{

  meth->sign = sign;

  meth->sign_setup = sign_setup;

  meth->sign_sig = sign_sig;

}

void

EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,

    int (*verify)(int type, const unsigned char *dgst, int dgst_len,

  const unsigned char *sigbuf, int sig_len, EC_KEY *eckey),

    int (*verify_sig)(const unsigned char *dgst, int dgst_len,

  const ECDSA_SIG *sig, EC_KEY *eckey))

{

  meth->verify = verify;

  meth->verify_sig = verify_sig;

}

void

EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,

    int (**pinit)(EC_KEY *key),

    void (**pfinish)(EC_KEY *key),

    int (**pcopy)(EC_KEY *dest, const EC_KEY *src),

    int (**pset_group)(EC_KEY *key, const EC_GROUP *grp),

    int (**pset_private)(EC_KEY *key, const BIGNUM *priv_key),

    int (**pset_public)(EC_KEY *key, const EC_POINT *pub_key))

{

  if (pinit != NULL)

    *pinit = meth->init;

  if (pfinish != NULL)

    *pfinish = meth->finish;

  if (pcopy != NULL)

    *pcopy = meth->copy;

  if (pset_group != NULL)

    *pset_group = meth->set_group;

  if (pset_private != NULL)

    *pset_private = meth->set_private;

  if (pset_public != NULL)

    *pset_public = meth->set_public;

}

void

EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,

    int (**pkeygen)(EC_KEY *key))

{

  if (pkeygen != NULL)

    *pkeygen = meth->keygen;

}

void

EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,

    int (**pck)(void *out, size_t outlen, const EC_POINT *pub_key, EC_KEY *ecdh,

    void *(*KDF) (const void *in, size_t inlen, void *out, size_t *outlen)))

{

  if (pck != NULL)

    *pck = meth->compute_key;

}

void

EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,

    int (**psign)(int type, const unsigned char *dgst,

  int dlen, unsigned char *sig, unsigned int *siglen,

  const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey),

    int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,

  BIGNUM **kinvp, BIGNUM **rp),

    ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,

  int dgst_len, const BIGNUM *in_kinv, const BIGNUM *in_r,

  EC_KEY *eckey))

{

  if (psign != NULL)

    *psign = meth->sign;

  if (psign_setup != NULL)

    *psign_setup = meth->sign_setup;

  if (psign_sig != NULL)

    *psign_sig = meth->sign_sig;

}

void

EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,

    int (**pverify)(int type, const unsigned char *dgst, int dgst_len,

  const unsigned char *sigbuf, int sig_len, EC_KEY *eckey),

    int (**pverify_sig)(const unsigned char *dgst, int dgst_len,

  const ECDSA_SIG *sig, EC_KEY *eckey))

{

  if (pverify != NULL)

    *pverify = meth->verify;

  if (pverify_sig != NULL)

    *pverify_sig = meth->verify_sig;

}