crypto/ffc/ffc_backend.c

   1 /*
   2  * Copyright 2020 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 #include <openssl/core_names.h>
  11 #include "internal/ffc.h"
  12
  13 /*
  14  * The intention with the "backend" source file is to offer backend support
  15  * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
  16  * implementations alike.
  17  */
  18
  19 int ffc_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
  20 {
  21     const OSSL_PARAM *param_p, *param_q, *param_g;
  22     BIGNUM *p = NULL, *q = NULL, *g = NULL;
  23
  24     if (ffc == NULL)
  25         return 0;
  26
  27     param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
  28     param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
  29     param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
  30
  31     if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
  32         || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
  33         || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
  34         goto err;
  35
  36     ffc_params_set0_pqg(ffc, p, q, g);
  37     return 1;
  38
  39  err:
  40     BN_free(p);
  41     BN_free(q);
  42     BN_free(g);
  43     return 0;
  44 }