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/* $OpenBSD: ec_kmeth.c,v 1.5 2019/05/10 19:15:06 bcook 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 "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;
}
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