mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
47c239c6b8
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/10952)
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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/*
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* DSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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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 <openssl/self_test.h>
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#include "crypto/dsa.h"
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#include "dsa_local.h"
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static int dsa_keygen(DSA *dsa, int pairwise_test);
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static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg);
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int DSA_generate_key(DSA *dsa)
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{
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#ifndef FIPS_MODE
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if (dsa->meth->dsa_keygen != NULL)
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return dsa->meth->dsa_keygen(dsa);
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#endif
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return dsa_keygen(dsa, 0);
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}
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int dsa_generate_public_key(BN_CTX *ctx, const DSA *dsa, const BIGNUM *priv_key,
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BIGNUM *pub_key)
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{
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int ret = 0;
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BIGNUM *prk = BN_new();
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if (prk == NULL)
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return 0;
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BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
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/* pub_key = g ^ priv_key mod p */
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if (!BN_mod_exp(pub_key, dsa->params.g, prk, dsa->params.p, ctx))
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goto err;
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ret = 1;
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err:
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BN_clear_free(prk);
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return ret;
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}
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static int dsa_keygen(DSA *dsa, int pairwise_test)
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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_ex(dsa->libctx)) == 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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}
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if (!ffc_generate_private_key(ctx, &dsa->params, BN_num_bits(dsa->params.q),
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112, priv_key))
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goto err;
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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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if (!dsa_generate_public_key(ctx, dsa, priv_key, pub_key))
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goto err;
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dsa->priv_key = priv_key;
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dsa->pub_key = pub_key;
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#ifdef FIPS_MODE
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pairwise_test = 1;
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#endif /* FIPS_MODE */
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ok = 1;
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if (pairwise_test) {
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OSSL_CALLBACK *cb = NULL;
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void *cbarg = NULL;
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OSSL_SELF_TEST_get_callback(dsa->libctx, &cb, &cbarg);
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ok = dsa_keygen_pairwise_test(dsa, cb, cbarg);
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if (!ok) {
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BN_free(dsa->pub_key);
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BN_clear_free(dsa->priv_key);
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BN_CTX_free(ctx);
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return ok;
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}
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}
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dsa->dirty_cnt++;
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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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/*
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* FIPS 140-2 IG 9.9 AS09.33
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* Perform a sign/verify operation.
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*/
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static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg)
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{
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int ret = 0;
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unsigned char dgst[16] = {0};
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unsigned int dgst_len = (unsigned int)sizeof(dgst);
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DSA_SIG *sig = NULL;
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OSSL_SELF_TEST *st = NULL;
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st = OSSL_SELF_TEST_new(cb, cbarg);
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if (st == NULL)
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goto err;
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OSSL_SELF_TEST_onbegin(st, OSSL_SELF_TEST_TYPE_PCT,
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OSSL_SELF_TEST_DESC_PCT_DSA);
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sig = DSA_do_sign(dgst, (int)dgst_len, dsa);
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if (sig == NULL)
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goto err;
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OSSL_SELF_TEST_oncorrupt_byte(st, dgst);
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if (DSA_do_verify(dgst, dgst_len, sig, dsa) != 1)
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goto err;
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ret = 1;
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err:
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OSSL_SELF_TEST_onend(st, ret);
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OSSL_SELF_TEST_free(st);
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DSA_SIG_free(sig);
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return ret;
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}
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