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/*
* Copyright (C) 2008 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Copyright (C) 2000-2008 Andreas Steffen
* 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.
*
* $Id: pubkey_public_key.c 4059 2008-06-11 14:10:02Z martin $
*/
#include "pubkey_public_key.h"
#include <debug.h>
#include <asn1/pem.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <asn1/asn1_parser.h>
/**
* ASN.1 definition of a subjectPublicKeyInfo structure
*/
static const asn1Object_t pkinfoObjects[] = {
{ 0, "subjectPublicKeyInfo",ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "algorithm", ASN1_EOC, ASN1_RAW }, /* 1 */
{ 1, "subjectPublicKey", ASN1_BIT_STRING, ASN1_BODY }, /* 2 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PKINFO_SUBJECT_PUBLIC_KEY_ALGORITHM 1
#define PKINFO_SUBJECT_PUBLIC_KEY 2
/**
* Load a public key from an ASN1 encoded blob
*/
static public_key_t *load(chunk_t blob)
{
asn1_parser_t *parser;
chunk_t object;
int objectID;
public_key_t *key = NULL;
key_type_t type = KEY_ANY;
parser = asn1_parser_create(pkinfoObjects, blob);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PKINFO_SUBJECT_PUBLIC_KEY_ALGORITHM:
{
int oid = asn1_parse_algorithmIdentifier(object,
parser->get_level(parser)+1, NULL);
if (oid == OID_RSA_ENCRYPTION)
{
type = KEY_RSA;
}
else if (oid == OID_EC_PUBLICKEY)
{
/* we need the whole subjectPublicKeyInfo for EC public keys */
key = lib->creds->create(lib->creds,
CRED_PUBLIC_KEY, KEY_ECDSA, BUILD_BLOB_ASN1_DER,
chunk_clone(blob), BUILD_END);
goto end;
}
else
{
/* key type not supported */
goto end;
}
break;
}
case PKINFO_SUBJECT_PUBLIC_KEY:
if (object.len > 0 && *object.ptr == 0x00)
{
/* skip initial bit string octet defining 0 unused bits */
object = chunk_skip(object, 1);
}
key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, type,
BUILD_BLOB_ASN1_DER, chunk_clone(object),
BUILD_END);
break;
}
}
end:
parser->destroy(parser);
free(blob.ptr);
return key;
}
typedef struct private_builder_t private_builder_t;
/**
* Builder implementation for key loading
*/
struct private_builder_t {
/** implements the builder interface */
builder_t public;
/** loaded public key */
public_key_t *key;
};
/**
* Implementation of builder_t.build
*/
static public_key_t *build(private_builder_t *this)
{
public_key_t *key = this->key;
free(this);
return key;
}
/**
* Implementation of builder_t.add
*/
static void add(private_builder_t *this, builder_part_t part, ...)
{
va_list args;
if (this->key)
{
DBG1("ignoring surplus build part %N", builder_part_names, part);
return;
}
va_start(args, part);
switch (part)
{
case BUILD_BLOB_ASN1_DER:
{
this->key = load(va_arg(args, chunk_t));
break;
}
case BUILD_BLOB_ASN1_PEM:
{
bool pgp;
char *pem;
chunk_t blob;
pem = va_arg(args, char *);
blob = chunk_clone(chunk_create(pem, strlen(pem)));
if (pem_to_bin(&blob, &chunk_empty, &pgp))
{
this->key = load(chunk_clone(blob));
}
free(blob.ptr);
break;
}
default:
DBG1("ignoring unsupported build part %N", builder_part_names, part);
break;
}
va_end(args);
}
/**
* Builder construction function
*/
builder_t *pubkey_public_key_builder(key_type_t type)
{
private_builder_t *this;
if (type != KEY_ANY)
{
return NULL;
}
this = malloc_thing(private_builder_t);
this->key = NULL;
this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
this->public.build = (void*(*)(builder_t *this))build;
return &this->public;
}
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