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/*
* Copyright (C) 2012 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pkcs8_builder.h"
#include <debug.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <asn1/asn1_parser.h>
#include <credentials/keys/private_key.h>
/**
* ASN.1 definition of a privateKeyInfo structure
*/
static const asn1Object_t pkinfoObjects[] = {
{ 0, "privateKeyInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "privateKeyAlgorithm", ASN1_EOC, ASN1_RAW }, /* 2 */
{ 1, "privateKey", ASN1_OCTET_STRING, ASN1_BODY }, /* 3 */
{ 1, "attributes", ASN1_CONTEXT_C_0, ASN1_OPT }, /* 4 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 5 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PKINFO_PRIVATE_KEY_ALGORITHM 2
#define PKINFO_PRIVATE_KEY 3
/**
* Load a generic private key from an ASN.1 encoded blob
*/
static private_key_t *parse_private_key(chunk_t blob)
{
asn1_parser_t *parser;
chunk_t object;
int objectID;
private_key_t *key = NULL;
key_type_t type = KEY_ANY;
parser = asn1_parser_create(pkinfoObjects, blob);
parser->set_flags(parser, FALSE, TRUE);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PKINFO_PRIVATE_KEY_ALGORITHM:
{
int oid = asn1_parse_algorithmIdentifier(object,
parser->get_level(parser) + 1, NULL);
if (oid == OID_RSA_ENCRYPTION)
{
type = KEY_RSA;
}
else
{ /* key type not supported */
goto end;
}
break;
}
case PKINFO_PRIVATE_KEY:
{
DBG2(DBG_ASN, "-- > --");
key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
BUILD_BLOB_ASN1_DER, object, BUILD_END);
DBG2(DBG_ASN, "-- < --");
break;
}
}
}
end:
parser->destroy(parser);
return key;
}
/**
* See header.
*/
private_key_t *pkcs8_private_key_load(key_type_t type, va_list args)
{
chunk_t blob = chunk_empty;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_ASN1_DER:
blob = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
return parse_private_key(blob);
}
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