1/*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10/*
11 * DSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14#include "internal/deprecated.h"
15
16#include <openssl/opensslconf.h>
17#include <stdio.h>
18#include "internal/cryptlib.h"
19#include <openssl/evp.h>
20#include <openssl/bn.h>
21#include <openssl/rand.h>
22#include <openssl/sha.h>
23#include "crypto/dsa.h"
24#include "dsa_local.h"
25
26int ossl_dsa_generate_ffc_parameters(DSA *dsa, int type, int pbits, int qbits,
27                                     BN_GENCB *cb)
28{
29    int ret = 0, res;
30
31#ifndef FIPS_MODULE
32    if (type == DSA_PARAMGEN_TYPE_FIPS_186_2)
33        ret = ossl_ffc_params_FIPS186_2_generate(dsa->libctx, &dsa->params,
34                                                 FFC_PARAM_TYPE_DSA,
35                                                 pbits, qbits, &res, cb);
36    else
37#endif
38        ret = ossl_ffc_params_FIPS186_4_generate(dsa->libctx, &dsa->params,
39                                                 FFC_PARAM_TYPE_DSA,
40                                                 pbits, qbits, &res, cb);
41    if (ret > 0)
42        dsa->dirty_cnt++;
43    return ret;
44}
45
46#ifndef FIPS_MODULE
47int DSA_generate_parameters_ex(DSA *dsa, int bits,
48                               const unsigned char *seed_in, int seed_len,
49                               int *counter_ret, unsigned long *h_ret,
50                               BN_GENCB *cb)
51{
52    if (dsa->meth->dsa_paramgen)
53        return dsa->meth->dsa_paramgen(dsa, bits, seed_in, seed_len,
54                                       counter_ret, h_ret, cb);
55    if (seed_in != NULL
56        && !ossl_ffc_params_set_validate_params(&dsa->params, seed_in, seed_len,
57                                                -1))
58        return 0;
59
60    /* The old code used FIPS 186-2 DSA Parameter generation */
61    if (bits < 2048 && seed_len <= 20) {
62        if (!ossl_dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_2,
63                                              bits, 160, cb))
64            return 0;
65    } else {
66        if (!ossl_dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_4,
67                                              bits, 0, cb))
68            return 0;
69    }
70
71    if (counter_ret != NULL)
72        *counter_ret = dsa->params.pcounter;
73    if (h_ret != NULL)
74        *h_ret = dsa->params.h;
75    return 1;
76}
77#endif
78