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 #include "internal/sizes.h"
  13
  14 /*
  15  * The intention with the "backend" source file is to offer backend support
  16  * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
  17  * implementations alike.
  18  */
  19
  20 int ossl_ffc_params_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
  21 {
  22     const OSSL_PARAM *prm;
  23     const OSSL_PARAM *param_p, *param_q, *param_g;
  24     BIGNUM *p = NULL, *q = NULL, *g = NULL, *j = NULL;
  25     int i;
  26
  27     if (ffc == NULL)
  28         return 0;
  29
  30     prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
  31     if (prm != NULL) {
  32         /*
  33          * In a no-dh build we just go straight to err because we have no
  34          * support for this.
  35          */
  36 #ifndef OPENSSL_NO_DH
  37         const DH_NAMED_GROUP *group = NULL;
  38
  39         if (prm->data_type != OSSL_PARAM_UTF8_STRING
  40             || (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL
  41             || !ossl_ffc_named_group_set_pqg(ffc, group))
  42 #endif
  43             goto err;
  44     }
  45
  46     param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
  47     param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
  48     param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
  49
  50     if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
  51         || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
  52         || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
  53         goto err;
  54
  55     prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
  56     if (prm != NULL) {
  57         if (!OSSL_PARAM_get_int(prm, &i))
  58             goto err;
  59         ffc->gindex =  i;
  60     }
  61     prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
  62     if (prm != NULL) {
  63         if (!OSSL_PARAM_get_int(prm, &i))
  64             goto err;
  65         ffc->pcounter = i;
  66     }
  67     prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR);
  68     if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j))
  69         goto err;
  70     prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
  71     if (prm != NULL) {
  72         if (!OSSL_PARAM_get_int(prm, &i))
  73             goto err;
  74         ffc->h =  i;
  75     }
  76     prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
  77     if (prm != NULL) {
  78         if (prm->data_type != OSSL_PARAM_OCTET_STRING)
  79             goto err;
  80         if (!ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size))
  81             goto err;
  82     }
  83     prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_TYPE);
  84     if (prm != NULL) {
  85         if (prm->data_type != OSSL_PARAM_UTF8_STRING)
  86             goto err;
  87         ossl_ffc_params_set_flags(ffc, ossl_ffc_params_flags_from_name(prm->data));
  88     }
  89     prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
  90     if (prm != NULL) {
  91         const OSSL_PARAM *p1;
  92         const char *props = NULL;
  93
  94         if (prm->data_type != OSSL_PARAM_UTF8_STRING)
  95             goto err;
  96         p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
  97         if (p1 != NULL) {
  98             if (p1->data_type != OSSL_PARAM_UTF8_STRING)
  99                 goto err;
 100         }
 101         if (!ossl_ffc_set_digest(ffc, prm->data, props))
 102             goto err;
 103     }
 104
 105     ossl_ffc_params_set0_pqg(ffc, p, q, g);
 106     ossl_ffc_params_set0_j(ffc, j);
 107     return 1;
 108
 109  err:
 110     BN_free(j);
 111     BN_free(p);
 112     BN_free(q);
 113     BN_free(g);
 114     return 0;
 115 }