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76 lines
2.2 KiB
C
76 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 load DSA params from raw data
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* using EVP_PKEY_fromdata()
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*/
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#include <openssl/param_build.h>
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#include <openssl/evp.h>
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#include <openssl/core_names.h>
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#include "dsa.inc"
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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_CTX *ctx = NULL;
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EVP_PKEY *dsaparamkey = NULL;
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OSSL_PARAM_BLD *bld = NULL;
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OSSL_PARAM *params = NULL;
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BIGNUM *p = NULL, *q = NULL, *g = NULL;
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p = BN_bin2bn(dsa_p, sizeof(dsa_p), NULL);
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q = BN_bin2bn(dsa_q, sizeof(dsa_q), NULL);
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g = BN_bin2bn(dsa_g, sizeof(dsa_g), NULL);
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if (p == NULL || q == NULL || g == NULL)
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goto cleanup;
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/* Use OSSL_PARAM_BLD if you need to handle BIGNUM Parameters */
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bld = OSSL_PARAM_BLD_new();
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if (bld == NULL)
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goto cleanup;
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if (!OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, p)
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|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_Q, q)
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|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, g))
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goto cleanup;
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params = OSSL_PARAM_BLD_to_param(bld);
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if (params == NULL)
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goto cleanup;
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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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goto cleanup;
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}
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if (EVP_PKEY_fromdata_init(ctx) <= 0
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|| EVP_PKEY_fromdata(ctx, &dsaparamkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) {
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fprintf(stderr, "EVP_PKEY_fromdata() failed\n");
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goto cleanup;
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}
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if (!dsa_print_key(dsaparamkey, 0, 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(dsaparamkey);
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EVP_PKEY_CTX_free(ctx);
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OSSL_PARAM_free(params);
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OSSL_PARAM_BLD_free(bld);
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BN_free(g);
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BN_free(q);
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BN_free(p);
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return ret;
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}
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