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/*
* Copyright 1995-2020 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 <openssl/self_test.h>
#include "crypto/dsa.h"
#include "dsa_local.h"
#ifdef FIPS_MODE
# define MIN_STRENGTH 112
#else
# define MIN_STRENGTH 80
#endif
static int dsa_keygen(DSA *dsa, int pairwise_test);
static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg);
int DSA_generate_key(DSA *dsa)
{
#ifndef FIPS_MODE
if (dsa->meth->dsa_keygen != NULL)
return dsa->meth->dsa_keygen(dsa);
#endif
return dsa_keygen(dsa, 0);
}
int dsa_generate_public_key(BN_CTX *ctx, const DSA *dsa, const BIGNUM *priv_key,
BIGNUM *pub_key)
{
int ret = 0;
BIGNUM *prk = BN_new();
if (prk == NULL)
return 0;
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))
goto err;
ret = 1;
err:
BN_clear_free(prk);
return ret;
}
static int dsa_keygen(DSA *dsa, int pairwise_test)
{
int ok = 0;
BN_CTX *ctx = NULL;
BIGNUM *pub_key = NULL, *priv_key = NULL;
if ((ctx = BN_CTX_new_ex(dsa->libctx)) == NULL)
goto err;
if (dsa->priv_key == NULL) {
if ((priv_key = BN_secure_new()) == NULL)
goto err;
} else {
priv_key = dsa->priv_key;
}
/*
* For FFC FIPS 186-4 keygen
* security strength s = 112,
* Max Private key size N = len(q)
*/
if (!ffc_generate_private_key(ctx, &dsa->params, BN_num_bits(dsa->params.q),
MIN_STRENGTH, priv_key))
goto err;
if (dsa->pub_key == NULL) {
if ((pub_key = BN_new()) == NULL)
goto err;
} else {
pub_key = dsa->pub_key;
}
if (!dsa_generate_public_key(ctx, dsa, priv_key, pub_key))
goto err;
dsa->priv_key = priv_key;
dsa->pub_key = pub_key;
#ifdef FIPS_MODE
pairwise_test = 1;
#endif /* FIPS_MODE */
ok = 1;
if (pairwise_test) {
OSSL_CALLBACK *cb = NULL;
void *cbarg = NULL;
OSSL_SELF_TEST_get_callback(dsa->libctx, &cb, &cbarg);
ok = dsa_keygen_pairwise_test(dsa, cb, cbarg);
if (!ok) {
BN_free(dsa->pub_key);
BN_clear_free(dsa->priv_key);
BN_CTX_free(ctx);
return ok;
}
}
dsa->dirty_cnt++;
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;
}
/*
* FIPS 140-2 IG 9.9 AS09.33
* Perform a sign/verify operation.
*/
static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg)
{
int ret = 0;
unsigned char dgst[16] = {0};
unsigned int dgst_len = (unsigned int)sizeof(dgst);
DSA_SIG *sig = NULL;
OSSL_SELF_TEST *st = NULL;
st = OSSL_SELF_TEST_new(cb, cbarg);
if (st == NULL)
goto err;
OSSL_SELF_TEST_onbegin(st, OSSL_SELF_TEST_TYPE_PCT,
OSSL_SELF_TEST_DESC_PCT_DSA);
sig = DSA_do_sign(dgst, (int)dgst_len, dsa);
if (sig == NULL)
goto err;
OSSL_SELF_TEST_oncorrupt_byte(st, dgst);
if (DSA_do_verify(dgst, dgst_len, sig, dsa) != 1)
goto err;
ret = 1;
err:
OSSL_SELF_TEST_onend(st, ret);
OSSL_SELF_TEST_free(st);
DSA_SIG_free(sig);
return ret;
}
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