243 lines
5.2 KiB
C
243 lines
5.2 KiB
C
/*
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* Copyright (C) 2018 Tobias Brunner
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* HSR Hochschule fuer Technik Rapperswil
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "botan_util.h"
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#include "botan_util_keys.h"
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#include "botan_ec_public_key.h"
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#include "botan_ec_private_key.h"
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#include "botan_ed_public_key.h"
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#include "botan_ed_private_key.h"
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#include "botan_rsa_public_key.h"
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#include "botan_rsa_private_key.h"
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#include <asn1/asn1.h>
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#include <asn1/oid.h>
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/**
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* Get the algorithm name of a public key
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*/
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static char *get_algo_name(botan_pubkey_t pubkey)
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{
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char *name;
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size_t len = 0;
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if (botan_pubkey_algo_name(pubkey, NULL, &len)
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!= BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE)
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{
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return NULL;
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}
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name = malloc(len);
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if (botan_pubkey_algo_name(pubkey, name, &len))
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{
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free(name);
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return NULL;
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}
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return name;
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}
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/*
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* Described in header
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*/
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public_key_t *botan_public_key_load(key_type_t type, va_list args)
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{
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public_key_t *this = NULL;
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botan_pubkey_t pubkey;
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chunk_t blob = chunk_empty;
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botan_rng_t rng;
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char *name;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_BLOB_ASN1_DER:
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blob = va_arg(args, chunk_t);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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if (!botan_get_rng(&rng, RNG_STRONG))
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{
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return NULL;
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}
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if (botan_pubkey_load(&pubkey, blob.ptr, blob.len))
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{
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botan_rng_destroy(rng);
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return NULL;
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}
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if (botan_pubkey_check_key(pubkey, rng, BOTAN_CHECK_KEY_EXPENSIVE_TESTS))
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{
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DBG1(DBG_LIB, "public key failed key checks");
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botan_pubkey_destroy(pubkey);
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botan_rng_destroy(rng);
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return NULL;
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}
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botan_rng_destroy(rng);
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name = get_algo_name(pubkey);
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if (!name)
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{
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botan_pubkey_destroy(pubkey);
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return NULL;
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}
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#ifdef BOTAN_HAS_RSA
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if (streq(name, "RSA") && (type == KEY_ANY || type == KEY_RSA))
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{
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this = (public_key_t*)botan_rsa_public_key_adopt(pubkey);
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}
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else
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#endif
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#ifdef BOTAN_HAS_ECDSA
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if (streq(name, "ECDSA") && (type == KEY_ANY || type == KEY_ECDSA))
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{
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this = (public_key_t*)botan_ec_public_key_adopt(pubkey);
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}
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else
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#endif
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#ifdef BOTAN_HAS_ED25519
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if (streq(name, "Ed25519") && (type == KEY_ANY || type == KEY_ED25519))
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{
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this = botan_ed_public_key_adopt(pubkey);
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}
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else
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#endif
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{
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botan_pubkey_destroy(pubkey);
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}
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free(name);
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return this;
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}
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#ifdef BOTAN_HAS_ECDSA
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/**
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* Determine the curve OID from a PKCS#8 structure
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*/
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static int determine_ec_oid(chunk_t pkcs8)
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{
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int oid = OID_UNKNOWN;
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chunk_t inner, params = chunk_empty;
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if (asn1_unwrap(&pkcs8, &pkcs8) == ASN1_SEQUENCE &&
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asn1_unwrap(&pkcs8, &inner) == ASN1_INTEGER &&
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asn1_parse_integer_uint64(inner) == 0 &&
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asn1_parse_algorithmIdentifier(pkcs8, 0, ¶ms) == OID_EC_PUBLICKEY &&
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params.len &&
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asn1_unwrap(¶ms, ¶ms) == ASN1_OID)
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{
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oid = asn1_known_oid(params);
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}
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return oid;
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}
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#endif
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/*
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* Described in header
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*/
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private_key_t *botan_private_key_load(key_type_t type, va_list args)
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{
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private_key_t *this = NULL;
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botan_privkey_t key;
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botan_pubkey_t pubkey;
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chunk_t blob = chunk_empty;
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botan_rng_t rng;
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char *name;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_BLOB_ASN1_DER:
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blob = va_arg(args, chunk_t);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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if (!botan_get_rng(&rng, RNG_STRONG))
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{
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return NULL;
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}
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if (botan_privkey_load(&key, rng, blob.ptr, blob.len, NULL))
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{
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botan_rng_destroy(rng);
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return NULL;
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}
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botan_rng_destroy(rng);
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if (botan_privkey_export_pubkey(&pubkey, key))
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{
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botan_privkey_destroy(key);
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return NULL;
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}
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name = get_algo_name(pubkey);
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botan_pubkey_destroy(pubkey);
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if (!name)
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{
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botan_privkey_destroy(key);
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return NULL;
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}
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#ifdef BOTAN_HAS_RSA
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if (streq(name, "RSA") && (type == KEY_ANY || type == KEY_RSA))
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{
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this = (private_key_t*)botan_rsa_private_key_adopt(key);
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}
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else
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#endif
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#ifdef BOTAN_HAS_ECDSA
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if (streq(name, "ECDSA") && (type == KEY_ANY || type == KEY_ECDSA))
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{
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int oid = determine_ec_oid(blob);
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if (oid != OID_UNKNOWN)
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{
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this = (private_key_t*)botan_ec_private_key_adopt(key, oid);
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}
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}
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else
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#endif
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#ifdef BOTAN_HAS_ED25519
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if (streq(name, "Ed25519") && (type == KEY_ANY || type == KEY_ED25519))
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{
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this = botan_ed_private_key_adopt(key);
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}
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#endif
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if (!this)
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{
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botan_privkey_destroy(key);
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}
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free(name);
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return this;
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}
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