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(OPENSSL_CTX *libctx, DSA *dsa, int type,
27 int pbits, int qbits, int gindex,
33 const EVP_MD *evpmd = pbits >= 2048 ? EVP_sha256() : EVP_sha1();
35 qbits = EVP_MD_size(evpmd) * 8;
37 dsa->params.gindex = gindex;
39 if (type == DSA_PARAMGEN_TYPE_FIPS_186_2)
40 ret = ffc_params_FIPS186_2_generate(libctx, &dsa->params,
42 pbits, qbits, NULL, &res, cb);
45 ret = ffc_params_FIPS186_4_generate(libctx, &dsa->params,
47 pbits, qbits, NULL, &res, cb);
53 int dsa_generate_parameters_ctx(OPENSSL_CTX *libctx, DSA *dsa, int bits,
54 const unsigned char *seed_in, int seed_len,
55 int *counter_ret, unsigned long *h_ret,
59 if (dsa->meth->dsa_paramgen)
60 return dsa->meth->dsa_paramgen(dsa, bits, seed_in, seed_len,
61 counter_ret, h_ret, cb);
64 && !ffc_params_set_validate_params(&dsa->params, seed_in, seed_len, -1))
68 /* The old code used FIPS 186-2 DSA Parameter generation */
69 if (bits <= 1024 && seed_len == 20) {
70 if (!dsa_generate_ffc_parameters(libctx, dsa,
71 DSA_PARAMGEN_TYPE_FIPS_186_2,
77 if (!dsa_generate_ffc_parameters(libctx, dsa,
78 DSA_PARAMGEN_TYPE_FIPS_186_4,
83 if (counter_ret != NULL)
84 *counter_ret = dsa->params.pcounter;
86 *h_ret = dsa->params.h;
90 int DSA_generate_parameters_ex(DSA *dsa, int bits,
91 const unsigned char *seed_in, int seed_len,
92 int *counter_ret, unsigned long *h_ret,
95 return dsa_generate_parameters_ctx(NULL, dsa, bits,
97 counter_ret, h_ret, cb);