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      1 /*-
      2  * Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      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
      8  */
      9 
     10 /*
     11  * Example showing how to load DSA params from raw data
     12  * using EVP_PKEY_fromdata()
     13  */
     14 
     15 #include <openssl/param_build.h>
     16 #include <openssl/evp.h>
     17 #include <openssl/core_names.h>
     18 #include "dsa.inc"
     19 
     20 int main(int argc, char **argv)
     21 {
     22     int ret = EXIT_FAILURE;
     23     OSSL_LIB_CTX *libctx = NULL;
     24     const char *propq = NULL;
     25     EVP_PKEY_CTX *ctx = NULL;
     26     EVP_PKEY *dsaparamkey = NULL;
     27     OSSL_PARAM_BLD *bld = NULL;
     28     OSSL_PARAM *params = NULL;
     29     BIGNUM *p = NULL, *q = NULL, *g = NULL;
     30 
     31     p = BN_bin2bn(dsa_p, sizeof(dsa_p), NULL);
     32     q = BN_bin2bn(dsa_q, sizeof(dsa_q), NULL);
     33     g = BN_bin2bn(dsa_g, sizeof(dsa_g), NULL);
     34     if (p == NULL || q == NULL || g == NULL)
     35         goto cleanup;
     36 
     37     /* Use OSSL_PARAM_BLD if you need to handle BIGNUM Parameters */
     38     bld = OSSL_PARAM_BLD_new();
     39     if (bld == NULL)
     40         goto cleanup;
     41     if (!OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, p)
     42         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_Q, q)
     43         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, g))
     44         goto cleanup;
     45     params = OSSL_PARAM_BLD_to_param(bld);
     46     if (params == NULL)
     47         goto cleanup;
     48 
     49     ctx = EVP_PKEY_CTX_new_from_name(libctx, "DSA", propq);
     50     if (ctx == NULL) {
     51         fprintf(stderr, "EVP_PKEY_CTX_new_from_name() failed\n");
     52         goto cleanup;
     53     }
     54 
     55     if (EVP_PKEY_fromdata_init(ctx) <= 0
     56         || EVP_PKEY_fromdata(ctx, &dsaparamkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) {
     57         fprintf(stderr, "EVP_PKEY_fromdata() failed\n");
     58         goto cleanup;
     59     }
     60 
     61     if (!dsa_print_key(dsaparamkey, 0, libctx, propq))
     62         goto cleanup;
     63 
     64     ret = EXIT_SUCCESS;
     65 cleanup:
     66     EVP_PKEY_free(dsaparamkey);
     67     EVP_PKEY_CTX_free(ctx);
     68     OSSL_PARAM_free(params);
     69     OSSL_PARAM_BLD_free(bld);
     70     BN_free(g);
     71     BN_free(q);
     72     BN_free(p);
     73 
     74     return ret;
     75 }
     76