mirror of
https://github.com/openssl/openssl.git
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85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* Copyright 1995-2016 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 <stdio.h>
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#include <time.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include "dsa_locl.h"
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#include <openssl/rand.h>
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static int dsa_builtin_keygen(DSA *dsa);
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int DSA_generate_key(DSA *dsa)
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{
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if (dsa->meth->dsa_keygen)
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return dsa->meth->dsa_keygen(dsa);
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return dsa_builtin_keygen(dsa);
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}
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static int dsa_builtin_keygen(DSA *dsa)
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{
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int ok = 0;
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BN_CTX *ctx = NULL;
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BIGNUM *pub_key = NULL, *priv_key = NULL;
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if ((ctx = BN_CTX_new()) == NULL)
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goto err;
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if (dsa->priv_key == NULL) {
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if ((priv_key = BN_secure_new()) == NULL)
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goto err;
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} else
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priv_key = dsa->priv_key;
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do
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if (!BN_rand_range(priv_key, dsa->q))
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goto err;
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while (BN_is_zero(priv_key)) ;
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if (dsa->pub_key == NULL) {
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if ((pub_key = BN_new()) == NULL)
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goto err;
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} else
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pub_key = dsa->pub_key;
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{
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BIGNUM *local_prk = NULL;
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BIGNUM *prk;
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if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
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local_prk = prk = BN_new();
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if (local_prk == NULL)
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goto err;
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BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
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} else {
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prk = priv_key;
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}
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if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) {
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BN_free(local_prk);
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goto err;
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}
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/* We MUST free local_prk before any further use of priv_key */
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BN_free(local_prk);
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}
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dsa->priv_key = priv_key;
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dsa->pub_key = pub_key;
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ok = 1;
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err:
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if (pub_key != dsa->pub_key)
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BN_free(pub_key);
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if (priv_key != dsa->priv_key)
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BN_free(priv_key);
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BN_CTX_free(ctx);
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return (ok);
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}
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