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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*-
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* Example showing how to generate an DSA key pair.
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*/
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#include <openssl/evp.h>
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#include "dsa.inc"
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/*
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* Generate dsa params using default values.
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* See the EVP_PKEY_DSA_param_fromdata demo if you need
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* to load DSA params from raw values.
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* See the EVP_PKEY_DSA_paramgen demo if you need to
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* use non default parameters.
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*/
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EVP_PKEY *dsa_genparams(OSSL_LIB_CTX *libctx, const char *propq)
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{
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EVP_PKEY *dsaparamkey = NULL;
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EVP_PKEY_CTX *ctx = NULL;
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/* Use the dsa params in a EVP_PKEY ctx */
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ctx = EVP_PKEY_CTX_new_from_name(libctx, "DSA", propq);
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if (ctx == NULL) {
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fprintf(stderr, "EVP_PKEY_CTX_new_from_name() failed\n");
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return NULL;
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}
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if (EVP_PKEY_paramgen_init(ctx) <= 0
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|| EVP_PKEY_paramgen(ctx, &dsaparamkey) <= 0) {
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fprintf(stderr, "DSA paramgen failed\n");
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goto cleanup;
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}
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cleanup:
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EVP_PKEY_CTX_free(ctx);
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return dsaparamkey;
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}
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int main(int argc, char **argv)
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{
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int ret = EXIT_FAILURE;
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OSSL_LIB_CTX *libctx = NULL;
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const char *propq = NULL;
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EVP_PKEY *dsaparamskey = NULL;
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EVP_PKEY *dsakey = NULL;
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EVP_PKEY_CTX *ctx = NULL;
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/* Generate random dsa params */
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dsaparamskey = dsa_genparams(libctx, propq);
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if (dsaparamskey == NULL)
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goto cleanup;
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/* Use the dsa params in a EVP_PKEY ctx */
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ctx = EVP_PKEY_CTX_new_from_pkey(libctx, dsaparamskey, propq);
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if (ctx == NULL) {
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fprintf(stderr, "EVP_PKEY_CTX_new_from_pkey() failed\n");
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goto cleanup;
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}
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/* Generate a key using the dsa params */
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if (EVP_PKEY_keygen_init(ctx) <= 0
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|| EVP_PKEY_keygen(ctx, &dsakey) <= 0) {
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fprintf(stderr, "DSA keygen failed\n");
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goto cleanup;
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}
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if (!dsa_print_key(dsakey, 1, libctx, propq))
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goto cleanup;
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ret = EXIT_SUCCESS;
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cleanup:
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EVP_PKEY_free(dsakey);
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EVP_PKEY_free(dsaparamskey);
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EVP_PKEY_CTX_free(ctx);
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return ret;
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}
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