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/*
* Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include "ec_lcl.h"
static const EC_KEY_METHOD openssl_ec_key_method = {
"OpenSSL EC_KEY method",
0,
0,0,0,0,0,0,
ossl_ec_key_gen,
ossl_ecdh_compute_key,
ossl_ecdsa_sign,
ossl_ecdsa_sign_setup,
ossl_ecdsa_sign_sig,
ossl_ecdsa_verify,
ossl_ecdsa_verify_sig
};
static 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);
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
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_int(OPENSSL_CTX *libctx, ENGINE *engine)
{
EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->libctx = libctx;
ret->references = 1;
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
ret->meth = EC_KEY_get_default_method();
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
if (engine != NULL) {
if (!ENGINE_init(engine)) {
ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_ENGINE_LIB);
goto err;
}
ret->engine = engine;
} else
ret->engine = ENGINE_get_default_EC();
if (ret->engine != NULL) {
ret->meth = ENGINE_get_EC(ret->engine);
if (ret->meth == NULL) {
ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_ENGINE_LIB);
goto err;
}
}
#endif
ret->version = 1;
ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
/* No ex_data inside the FIPS provider */
#ifndef FIPS_MODE
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
goto err;
}
#endif
if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_INIT_FAIL);
goto err;
}
return ret;
err:
EC_KEY_free(ret);
return NULL;
}
#ifndef FIPS_MODE
EC_KEY *EC_KEY_new_method(ENGINE *engine)
{
return ec_key_new_method_int(NULL, engine);
}
#endif
int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
const EC_KEY *eckey,
void *(*KDF) (const void *in, size_t inlen, void *out,
size_t *outlen))
{
unsigned char *sec = NULL;
size_t seclen;
if (eckey->meth->compute_key == NULL) {
ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
return 0;
}
if (outlen > INT_MAX) {
ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
return 0;
}
if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
return 0;
if (KDF != NULL) {
KDF(sec, seclen, out, &outlen);
} else {
if (outlen > seclen)
outlen = seclen;
memcpy(out, sec, outlen);
}
OPENSSL_clear_free(sec, seclen);
return outlen;
}
EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
{
EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
if (ret == 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->flags & EC_KEY_METHOD_DYNAMIC)
OPENSSL_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)(unsigned char **psec,
size_t *pseclen,
const EC_POINT *pub_key,
const EC_KEY *ecdh))
{
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)(unsigned char **pout,
size_t *poutlen,
const EC_POINT *pub_key,
const EC_KEY *ecdh))
{
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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