mirror of
https://github.com/openssl/openssl.git
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da1c088f59
Reviewed-by: Richard Levitte <levitte@openssl.org> Release: yes
222 lines
5.7 KiB
C
222 lines
5.7 KiB
C
/*
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* Copyright 1995-2023 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 "prov/providercommon.h"
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#include "crypto/dsa.h"
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#include "dsa_local.h"
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#ifdef FIPS_MODULE
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# define MIN_STRENGTH 112
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#else
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# define MIN_STRENGTH 80
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#endif
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static int dsa_keygen(DSA *dsa);
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int DSA_generate_key(DSA *dsa)
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{
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#ifndef FIPS_MODULE
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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);
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}
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int ossl_dsa_generate_public_key(BN_CTX *ctx, const DSA *dsa,
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const BIGNUM *priv_key, 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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#ifdef FIPS_MODULE
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/*
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* Refer: FIPS 140-3 IG 10.3.A Additional Comment 1
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* Perform a KAT by duplicating the public key generation.
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*
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* NOTE: This issue requires a background understanding, provided in a separate
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* document; the current IG 10.3.A AC1 is insufficient regarding the PCT for
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* the key agreement scenario.
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*
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* Currently IG 10.3.A requires PCT in the mode of use prior to use of the
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* key pair, citing the PCT defined in the associated standard. For key
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* agreement, the only PCT defined in SP 800-56A is that of Section 5.6.2.4:
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* the comparison of the original public key to a newly calculated public key.
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*/
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static int dsa_keygen_knownanswer_test(DSA *dsa, BN_CTX *ctx,
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OSSL_CALLBACK *cb, void *cbarg)
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{
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int len, ret = 0;
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OSSL_SELF_TEST *st = NULL;
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unsigned char bytes[512] = {0};
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BIGNUM *pub_key2 = BN_new();
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if (pub_key2 == NULL)
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return 0;
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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_KAT,
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OSSL_SELF_TEST_DESC_PCT_DSA);
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if (!ossl_dsa_generate_public_key(ctx, dsa, dsa->priv_key, pub_key2))
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goto err;
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if (BN_num_bytes(pub_key2) > (int)sizeof(bytes))
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goto err;
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len = BN_bn2bin(pub_key2, bytes);
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OSSL_SELF_TEST_oncorrupt_byte(st, bytes);
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if (BN_bin2bn(bytes, len, pub_key2) != NULL)
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ret = !BN_cmp(dsa->pub_key, pub_key2);
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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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BN_free(pub_key2);
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return ret;
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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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#endif /* FIPS_MODULE */
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static int dsa_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_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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/* Do a partial check for invalid p, q, g */
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if (!ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
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FFC_PARAM_TYPE_DSA, NULL))
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goto err;
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/*
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* For FFC FIPS 186-4 keygen
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* security strength s = 112,
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* Max Private key size N = len(q)
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*/
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if (!ossl_ffc_generate_private_key(ctx, &dsa->params,
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BN_num_bits(dsa->params.q),
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MIN_STRENGTH, 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 (!ossl_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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ok = 1;
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#ifdef FIPS_MODULE
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{
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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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&& dsa_keygen_knownanswer_test(dsa, ctx, cb, cbarg);
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if (!ok) {
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ossl_set_error_state(OSSL_SELF_TEST_TYPE_PCT);
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BN_free(dsa->pub_key);
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BN_clear_free(dsa->priv_key);
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dsa->pub_key = NULL;
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dsa->priv_key = NULL;
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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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#endif
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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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