-/* crypto/dsa/dsa_key.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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 "cryptlib.h"
-#ifndef OPENSSL_NO_SHA
+#include "internal/cryptlib.h"
#include <openssl/bn.h>
-#include <openssl/dsa.h>
-#include <openssl/rand.h>
+#include <openssl/self_test.h>
+#include "prov/providercommon.h"
+#include "crypto/dsa.h"
+#include "dsa_local.h"
-static int dsa_builtin_keygen(DSA *dsa);
+#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)
- {
- if(dsa->meth->dsa_keygen)
- return dsa->meth->dsa_keygen(dsa);
- return dsa_builtin_keygen(dsa);
- }
-
-static int dsa_builtin_keygen(DSA *dsa)
- {
- int ok=0;
- BN_CTX *ctx=NULL;
- BIGNUM *pub_key=NULL,*priv_key=NULL;
-
- if ((ctx=BN_CTX_new()) == NULL) goto err;
-
- if (dsa->priv_key == NULL)
- {
- if ((priv_key=BN_new()) == NULL) goto err;
- }
- else
- priv_key=dsa->priv_key;
-
- do
- if (!BN_rand_range(priv_key,dsa->q)) goto err;
- while (BN_is_zero(priv_key));
-
- if (dsa->pub_key == NULL)
- {
- if ((pub_key=BN_new()) == NULL) goto err;
- }
- else
- pub_key=dsa->pub_key;
-
- {
- BIGNUM local_prk;
- BIGNUM *prk;
-
- if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
- {
- BN_init(&local_prk);
- prk = &local_prk;
- BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
- }
- else
- prk = priv_key;
-
- if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
- }
-
- dsa->priv_key=priv_key;
- dsa->pub_key=pub_key;
- ok=1;
+{
+#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:
- if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
- if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
- if (ctx != NULL) BN_CTX_free(ctx);
- return(ok);
- }
+ 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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