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/*
* Copyright 1995-2016 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
*/
/*
* DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <time.h>
#include "internal/cryptlib.h"
#include <openssl/bn.h>
#include "crypto/dsa.h"
#include "dsa_local.h"
static int dsa_builtin_keygen(OPENSSL_CTX *libctx, DSA *dsa);
int DSA_generate_key(DSA *dsa)
{
if (dsa->meth->dsa_keygen != NULL)
return dsa->meth->dsa_keygen(dsa);
return dsa_builtin_keygen(NULL, dsa);
}
int dsa_generate_key_ctx(OPENSSL_CTX *libctx, DSA *dsa)
{
#ifndef FIPS_MODE
if (dsa->meth->dsa_keygen != NULL)
return dsa->meth->dsa_keygen(dsa);
#endif
return dsa_builtin_keygen(libctx, dsa);
}
static int dsa_builtin_keygen(OPENSSL_CTX *libctx, DSA *dsa)
{
int ok = 0;
BN_CTX *ctx = NULL;
BIGNUM *pub_key = NULL, *priv_key = NULL;
if ((ctx = BN_CTX_new_ex(libctx)) == NULL)
goto err;
if (dsa->priv_key == NULL) {
if ((priv_key = BN_secure_new()) == NULL)
goto err;
} else {
priv_key = dsa->priv_key;
}
if (!ffc_generate_private_key(ctx, &dsa->params, BN_num_bits(dsa->params.q),
112, priv_key))
goto err;
if (dsa->pub_key == NULL) {
if ((pub_key = BN_new()) == NULL)
goto err;
} else {
pub_key = dsa->pub_key;
}
{
BIGNUM *prk = BN_new();
if (prk == NULL)
goto err;
BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
/* pub_key = g ^ priv_key mod p */
if (!BN_mod_exp(pub_key, dsa->params.g, prk, dsa->params.p, ctx)) {
BN_free(prk);
goto err;
}
/* We MUST free prk before any further use of priv_key */
BN_free(prk);
}
dsa->priv_key = priv_key;
dsa->pub_key = pub_key;
dsa->dirty_cnt++;
ok = 1;
err:
if (pub_key != dsa->pub_key)
BN_free(pub_key);
if (priv_key != dsa->priv_key)
BN_free(priv_key);
BN_CTX_free(ctx);
return ok;
}
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