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