1/* 2 * Copyright 2020-2023 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#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 20int 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 || prm->data == NULL 41 || (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL 42 || !ossl_ffc_named_group_set(ffc, group)) 43#endif 44 goto err; 45 } 46 47 param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P); 48 param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G); 49 param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q); 50 51 if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p)) 52 || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q)) 53 || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g))) 54 goto err; 55 56 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX); 57 if (prm != NULL) { 58 if (!OSSL_PARAM_get_int(prm, &i)) 59 goto err; 60 ffc->gindex = i; 61 } 62 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER); 63 if (prm != NULL) { 64 if (!OSSL_PARAM_get_int(prm, &i)) 65 goto err; 66 ffc->pcounter = i; 67 } 68 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR); 69 if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j)) 70 goto err; 71 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H); 72 if (prm != NULL) { 73 if (!OSSL_PARAM_get_int(prm, &i)) 74 goto err; 75 ffc->h = i; 76 } 77 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED); 78 if (prm != NULL) { 79 if (prm->data_type != OSSL_PARAM_OCTET_STRING) 80 goto err; 81 if (!ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size)) 82 goto err; 83 } 84 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_PQ); 85 if (prm != NULL) { 86 if (!OSSL_PARAM_get_int(prm, &i)) 87 goto err; 88 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_PQ, i); 89 } 90 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_G); 91 if (prm != NULL) { 92 if (!OSSL_PARAM_get_int(prm, &i)) 93 goto err; 94 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_G, i); 95 } 96 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_LEGACY); 97 if (prm != NULL) { 98 if (!OSSL_PARAM_get_int(prm, &i)) 99 goto err; 100 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY, i); 101 } 102 103 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST); 104 if (prm != NULL) { 105 const OSSL_PARAM *p1; 106 const char *props = NULL; 107 108 if (prm->data_type != OSSL_PARAM_UTF8_STRING) 109 goto err; 110 p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS); 111 if (p1 != NULL) { 112 if (p1->data_type != OSSL_PARAM_UTF8_STRING) 113 goto err; 114 props = p1->data; 115 } 116 if (!ossl_ffc_set_digest(ffc, prm->data, props)) 117 goto err; 118 } 119 120 ossl_ffc_params_set0_pqg(ffc, p, q, g); 121 ossl_ffc_params_set0_j(ffc, j); 122 return 1; 123 124 err: 125 BN_free(j); 126 BN_free(p); 127 BN_free(q); 128 BN_free(g); 129 return 0; 130} 131