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317 lines
10 KiB
C
317 lines
10 KiB
C
/*
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* Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <string.h>
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#include <openssl/ec.h>
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#include <openssl/engine.h>
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#include <openssl/err.h>
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#include "ec_local.h"
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static const EC_KEY_METHOD openssl_ec_key_method = {
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"OpenSSL EC_KEY method",
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0,
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0,0,0,0,0,0,
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ossl_ec_key_gen,
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ossl_ecdh_compute_key,
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ossl_ecdsa_sign,
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ossl_ecdsa_sign_setup,
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ossl_ecdsa_sign_sig,
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ossl_ecdsa_verify,
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ossl_ecdsa_verify_sig
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};
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static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
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const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
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{
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return &openssl_ec_key_method;
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}
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const EC_KEY_METHOD *EC_KEY_get_default_method(void)
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{
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return default_ec_key_meth;
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}
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void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
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{
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if (meth == NULL)
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default_ec_key_meth = &openssl_ec_key_method;
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else
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default_ec_key_meth = meth;
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}
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const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
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{
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return key->meth;
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}
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int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
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{
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void (*finish)(EC_KEY *key) = key->meth->finish;
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if (finish != NULL)
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finish(key);
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(key->engine);
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key->engine = NULL;
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#endif
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key->meth = meth;
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if (meth->init != NULL)
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return meth->init(key);
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return 1;
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}
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EC_KEY *EC_KEY_new_method(ENGINE *engine)
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{
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EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
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if (ret == NULL) {
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ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->references = 1;
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ret->lock = CRYPTO_THREAD_lock_new();
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if (ret->lock == NULL) {
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ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(ret);
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return NULL;
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}
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ret->meth = EC_KEY_get_default_method();
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#ifndef OPENSSL_NO_ENGINE
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if (engine != NULL) {
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if (!ENGINE_init(engine)) {
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ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
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goto err;
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}
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ret->engine = engine;
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} else
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ret->engine = ENGINE_get_default_EC();
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if (ret->engine != NULL) {
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ret->meth = ENGINE_get_EC(ret->engine);
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if (ret->meth == NULL) {
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ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
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goto err;
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}
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}
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#endif
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ret->version = 1;
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ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
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if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
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goto err;
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}
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if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
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ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_INIT_FAIL);
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goto err;
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}
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return ret;
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err:
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EC_KEY_free(ret);
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return NULL;
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}
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int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
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const EC_KEY *eckey,
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void *(*KDF) (const void *in, size_t inlen, void *out,
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size_t *outlen))
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{
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unsigned char *sec = NULL;
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size_t seclen;
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if (eckey->meth->compute_key == NULL) {
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ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
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return 0;
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}
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if (outlen > INT_MAX) {
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ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
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return 0;
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}
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if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
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return 0;
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if (KDF != NULL) {
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KDF(sec, seclen, out, &outlen);
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} else {
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if (outlen > seclen)
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outlen = seclen;
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memcpy(out, sec, outlen);
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}
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OPENSSL_clear_free(sec, seclen);
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return outlen;
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}
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EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
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{
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EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
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if (ret == NULL)
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return NULL;
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if (meth != NULL)
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*ret = *meth;
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ret->flags |= EC_KEY_METHOD_DYNAMIC;
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return ret;
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}
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void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
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{
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if (meth->flags & EC_KEY_METHOD_DYNAMIC)
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OPENSSL_free(meth);
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}
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void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
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int (*init)(EC_KEY *key),
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void (*finish)(EC_KEY *key),
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int (*copy)(EC_KEY *dest, const EC_KEY *src),
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int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
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int (*set_private)(EC_KEY *key,
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const BIGNUM *priv_key),
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int (*set_public)(EC_KEY *key,
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const EC_POINT *pub_key))
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{
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meth->init = init;
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meth->finish = finish;
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meth->copy = copy;
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meth->set_group = set_group;
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meth->set_private = set_private;
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meth->set_public = set_public;
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}
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void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
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int (*keygen)(EC_KEY *key))
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{
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meth->keygen = keygen;
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}
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void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
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int (*ckey)(unsigned char **psec,
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size_t *pseclen,
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const EC_POINT *pub_key,
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const EC_KEY *ecdh))
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{
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meth->compute_key = ckey;
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}
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void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
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int (*sign)(int type, const unsigned char *dgst,
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int dlen, unsigned char *sig,
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unsigned int *siglen,
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const BIGNUM *kinv, const BIGNUM *r,
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EC_KEY *eckey),
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int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
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BIGNUM **kinvp, BIGNUM **rp),
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ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
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int dgst_len,
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const BIGNUM *in_kinv,
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const BIGNUM *in_r,
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EC_KEY *eckey))
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{
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meth->sign = sign;
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meth->sign_setup = sign_setup;
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meth->sign_sig = sign_sig;
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}
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void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
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int (*verify)(int type, const unsigned
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char *dgst, int dgst_len,
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const unsigned char *sigbuf,
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int sig_len, EC_KEY *eckey),
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int (*verify_sig)(const unsigned char *dgst,
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int dgst_len,
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const ECDSA_SIG *sig,
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EC_KEY *eckey))
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{
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meth->verify = verify;
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meth->verify_sig = verify_sig;
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}
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void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
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int (**pinit)(EC_KEY *key),
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void (**pfinish)(EC_KEY *key),
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int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
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int (**pset_group)(EC_KEY *key,
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const EC_GROUP *grp),
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int (**pset_private)(EC_KEY *key,
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const BIGNUM *priv_key),
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int (**pset_public)(EC_KEY *key,
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const EC_POINT *pub_key))
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{
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if (pinit != NULL)
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*pinit = meth->init;
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if (pfinish != NULL)
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*pfinish = meth->finish;
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if (pcopy != NULL)
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*pcopy = meth->copy;
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if (pset_group != NULL)
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*pset_group = meth->set_group;
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if (pset_private != NULL)
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*pset_private = meth->set_private;
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if (pset_public != NULL)
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*pset_public = meth->set_public;
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}
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void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
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int (**pkeygen)(EC_KEY *key))
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{
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if (pkeygen != NULL)
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*pkeygen = meth->keygen;
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}
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void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
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int (**pck)(unsigned char **pout,
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size_t *poutlen,
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const EC_POINT *pub_key,
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const EC_KEY *ecdh))
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{
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if (pck != NULL)
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*pck = meth->compute_key;
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}
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void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
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int (**psign)(int type, const unsigned char *dgst,
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int dlen, unsigned char *sig,
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unsigned int *siglen,
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const BIGNUM *kinv, const BIGNUM *r,
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EC_KEY *eckey),
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int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
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BIGNUM **kinvp, BIGNUM **rp),
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ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
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int dgst_len,
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const BIGNUM *in_kinv,
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const BIGNUM *in_r,
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EC_KEY *eckey))
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{
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if (psign != NULL)
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*psign = meth->sign;
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if (psign_setup != NULL)
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*psign_setup = meth->sign_setup;
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if (psign_sig != NULL)
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*psign_sig = meth->sign_sig;
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}
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void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
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int (**pverify)(int type, const unsigned
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char *dgst, int dgst_len,
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const unsigned char *sigbuf,
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int sig_len, EC_KEY *eckey),
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int (**pverify_sig)(const unsigned char *dgst,
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int dgst_len,
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const ECDSA_SIG *sig,
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EC_KEY *eckey))
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{
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if (pverify != NULL)
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*pverify = meth->verify;
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if (pverify_sig != NULL)
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*pverify_sig = meth->verify_sig;
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}
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