2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * DSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
18 #include "internal/cryptlib.h"
19 #include <openssl/bn.h>
20 #include <openssl/self_test.h>
21 #include "prov/providercommon.h"
22 #include "crypto/dsa.h"
23 #include "dsa_local.h"
26 # define MIN_STRENGTH 112
28 # define MIN_STRENGTH 80
31 static int dsa_keygen(DSA *dsa, int pairwise_test);
32 static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg);
34 int DSA_generate_key(DSA *dsa)
37 if (dsa->meth->dsa_keygen != NULL)
38 return dsa->meth->dsa_keygen(dsa);
40 return dsa_keygen(dsa, 0);
43 int dsa_generate_public_key(BN_CTX *ctx, const DSA *dsa, const BIGNUM *priv_key,
47 BIGNUM *prk = BN_new();
51 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
53 /* pub_key = g ^ priv_key mod p */
54 if (!BN_mod_exp(pub_key, dsa->params.g, prk, dsa->params.p, ctx))
62 static int dsa_keygen(DSA *dsa, int pairwise_test)
66 BIGNUM *pub_key = NULL, *priv_key = NULL;
68 if ((ctx = BN_CTX_new_ex(dsa->libctx)) == NULL)
71 if (dsa->priv_key == NULL) {
72 if ((priv_key = BN_secure_new()) == NULL)
75 priv_key = dsa->priv_key;
78 /* Do a partial check for invalid p, q, g */
79 if (!ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
84 * For FFC FIPS 186-4 keygen
85 * security strength s = 112,
86 * Max Private key size N = len(q)
88 if (!ossl_ffc_generate_private_key(ctx, &dsa->params,
89 BN_num_bits(dsa->params.q),
90 MIN_STRENGTH, priv_key))
93 if (dsa->pub_key == NULL) {
94 if ((pub_key = BN_new()) == NULL)
97 pub_key = dsa->pub_key;
100 if (!dsa_generate_public_key(ctx, dsa, priv_key, pub_key))
103 dsa->priv_key = priv_key;
104 dsa->pub_key = pub_key;
108 #endif /* FIPS_MODULE */
112 OSSL_CALLBACK *cb = NULL;
115 OSSL_SELF_TEST_get_callback(dsa->libctx, &cb, &cbarg);
116 ok = dsa_keygen_pairwise_test(dsa, cb, cbarg);
118 ossl_set_error_state(OSSL_SELF_TEST_TYPE_PCT);
119 BN_free(dsa->pub_key);
120 BN_clear_free(dsa->priv_key);
122 dsa->priv_key = NULL;
130 if (pub_key != dsa->pub_key)
132 if (priv_key != dsa->priv_key)
140 * FIPS 140-2 IG 9.9 AS09.33
141 * Perform a sign/verify operation.
143 static int dsa_keygen_pairwise_test(DSA *dsa, OSSL_CALLBACK *cb, void *cbarg)
146 unsigned char dgst[16] = {0};
147 unsigned int dgst_len = (unsigned int)sizeof(dgst);
149 OSSL_SELF_TEST *st = NULL;
151 st = OSSL_SELF_TEST_new(cb, cbarg);
155 OSSL_SELF_TEST_onbegin(st, OSSL_SELF_TEST_TYPE_PCT,
156 OSSL_SELF_TEST_DESC_PCT_DSA);
158 sig = DSA_do_sign(dgst, (int)dgst_len, dsa);
162 OSSL_SELF_TEST_oncorrupt_byte(st, dgst);
164 if (DSA_do_verify(dgst, dgst_len, sig, dsa) != 1)
169 OSSL_SELF_TEST_onend(st, ret);
170 OSSL_SELF_TEST_free(st);