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"
16 #include <openssl/opensslconf.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"
26 int dsa_generate_ffc_parameters(DSA *dsa, int type,
28 EVP_MD *md, BN_GENCB *cb)
34 qbits = EVP_MD_size(md) * 8;
36 qbits = (pbits >= 2048 ? SHA256_DIGEST_LENGTH :
37 SHA_DIGEST_LENGTH) * 8;
40 if (type == DSA_PARAMGEN_TYPE_FIPS_186_2)
41 ret = ffc_params_FIPS186_2_generate(dsa->libctx, &dsa->params,
43 pbits, qbits, md, &res, cb);
46 ret = ffc_params_FIPS186_4_generate(dsa->libctx, &dsa->params,
48 pbits, qbits, md, &res, cb);
55 int DSA_generate_parameters_ex(DSA *dsa, int bits,
56 const unsigned char *seed_in, int seed_len,
57 int *counter_ret, unsigned long *h_ret,
61 if (dsa->meth->dsa_paramgen)
62 return dsa->meth->dsa_paramgen(dsa, bits, seed_in, seed_len,
63 counter_ret, h_ret, cb);
66 && !ffc_params_set_validate_params(&dsa->params, seed_in, seed_len, -1))
70 /* The old code used FIPS 186-2 DSA Parameter generation */
71 if (bits <= 1024 && seed_len == 20) {
72 if (!dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_2,
78 if (!dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_4,
83 if (counter_ret != NULL)
84 *counter_ret = dsa->params.pcounter;
86 *h_ret = dsa->params.h;