2 * Copyright 2022 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 * Example showing how to generate DSA params using
12 * FIPS 186-4 DSA FFC parameter generation.
15 #include <openssl/evp.h>
18 int main(int argc
, char **argv
)
20 int rv
= EXIT_FAILURE
;
21 OSSL_LIB_CTX
*libctx
= NULL
;
22 const char *propq
= NULL
;
23 EVP_PKEY_CTX
*ctx
= NULL
;
24 EVP_PKEY
*dsaparamkey
= NULL
;
26 unsigned int pbits
= 2048;
27 unsigned int qbits
= 256;
30 ctx
= EVP_PKEY_CTX_new_from_name(libctx
, "DSA", propq
);
35 * Demonstrate how to set optional DSA fields as params.
36 * See doc/man7/EVP_PKEY-FFC.pod and doc/man7/EVP_PKEY-DSA.pod
37 * for more information.
39 params
[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE
,
41 params
[1] = OSSL_PARAM_construct_uint(OSSL_PKEY_PARAM_FFC_PBITS
, &pbits
);
42 params
[2] = OSSL_PARAM_construct_uint(OSSL_PKEY_PARAM_FFC_QBITS
, &qbits
);
43 params
[3] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX
, &gindex
);
44 params
[4] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST
,
46 params
[5] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS
,
47 "provider=default", 0);
48 params
[6] = OSSL_PARAM_construct_end();
50 /* Generate a dsa param key using optional params */
51 if (EVP_PKEY_paramgen_init(ctx
) <= 0
52 || EVP_PKEY_CTX_set_params(ctx
, params
) <= 0
53 || EVP_PKEY_paramgen(ctx
, &dsaparamkey
) <= 0) {
54 fprintf(stderr
, "DSA paramgen failed\n");
58 if (!dsa_print_key(dsaparamkey
, 0, libctx
, propq
))
63 EVP_PKEY_free(dsaparamkey
);
64 EVP_PKEY_CTX_free(ctx
);