| 1 | /*
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| 2 | * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/core_names.h>
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| 11 | #include "internal/ffc.h"
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| 12 | #include "internal/sizes.h"
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| 13 |
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| 14 | /*
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| 15 | * The intention with the "backend" source file is to offer backend support
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| 16 | * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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| 17 | * implementations alike.
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| 18 | */
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| 19 |
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| 20 | int ossl_ffc_params_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
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| 21 | {
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| 22 | const OSSL_PARAM *prm;
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| 23 | const OSSL_PARAM *param_p, *param_q, *param_g;
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| 24 | BIGNUM *p = NULL, *q = NULL, *g = NULL, *j = NULL;
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| 25 | int i;
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| 26 |
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| 27 | if (ffc == NULL)
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| 28 | return 0;
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| 29 |
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| 30 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
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| 31 | if (prm != NULL) {
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| 32 | /*
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| 33 | * In a no-dh build we just go straight to err because we have no
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| 34 | * support for this.
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| 35 | */
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| 36 | #ifndef OPENSSL_NO_DH
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| 37 | const DH_NAMED_GROUP *group = NULL;
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| 38 |
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| 39 | if (prm->data_type != OSSL_PARAM_UTF8_STRING
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| 40 | || prm->data == NULL
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| 41 | || (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL
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| 42 | || !ossl_ffc_named_group_set(ffc, group))
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| 43 | #endif
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| 44 | goto err;
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| 45 | }
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| 46 |
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| 47 | param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
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| 48 | param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
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| 49 | param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
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| 50 |
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| 51 | if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
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| 52 | || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
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| 53 | || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
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| 54 | goto err;
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| 55 |
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| 56 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
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| 57 | if (prm != NULL) {
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| 58 | if (!OSSL_PARAM_get_int(prm, &i))
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| 59 | goto err;
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| 60 | ffc->gindex = i;
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| 61 | }
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| 62 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
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| 63 | if (prm != NULL) {
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| 64 | if (!OSSL_PARAM_get_int(prm, &i))
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| 65 | goto err;
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| 66 | ffc->pcounter = i;
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| 67 | }
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| 68 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR);
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| 69 | if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j))
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| 70 | goto err;
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| 71 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
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| 72 | if (prm != NULL) {
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| 73 | if (!OSSL_PARAM_get_int(prm, &i))
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| 74 | goto err;
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| 75 | ffc->h = i;
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| 76 | }
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| 77 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
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| 78 | if (prm != NULL) {
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| 79 | if (prm->data_type != OSSL_PARAM_OCTET_STRING)
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| 80 | goto err;
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| 81 | if (!ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size))
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| 82 | goto err;
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| 83 | }
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| 84 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_PQ);
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| 85 | if (prm != NULL) {
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| 86 | if (!OSSL_PARAM_get_int(prm, &i))
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| 87 | goto err;
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| 88 | ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_PQ, i);
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| 89 | }
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| 90 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_G);
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| 91 | if (prm != NULL) {
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| 92 | if (!OSSL_PARAM_get_int(prm, &i))
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| 93 | goto err;
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| 94 | ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_G, i);
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| 95 | }
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| 96 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_LEGACY);
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| 97 | if (prm != NULL) {
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| 98 | if (!OSSL_PARAM_get_int(prm, &i))
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| 99 | goto err;
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| 100 | ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY, i);
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| 101 | }
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| 102 |
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| 103 | prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
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| 104 | if (prm != NULL) {
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| 105 | const OSSL_PARAM *p1;
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| 106 | const char *props = NULL;
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| 107 |
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| 108 | if (prm->data_type != OSSL_PARAM_UTF8_STRING)
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| 109 | goto err;
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| 110 | p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
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| 111 | if (p1 != NULL) {
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| 112 | if (p1->data_type != OSSL_PARAM_UTF8_STRING)
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| 113 | goto err;
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| 114 | props = p1->data;
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| 115 | }
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| 116 | if (!ossl_ffc_set_digest(ffc, prm->data, props))
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| 117 | goto err;
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| 118 | }
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| 119 |
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| 120 | ossl_ffc_params_set0_pqg(ffc, p, q, g);
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| 121 | ossl_ffc_params_set0_j(ffc, j);
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| 122 | return 1;
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| 123 |
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| 124 | err:
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| 125 | BN_free(j);
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| 126 | BN_free(p);
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| 127 | BN_free(q);
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| 128 | BN_free(g);
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| 129 | return 0;
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| 130 | }
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