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/*
* Copyright (C) 2008-2009 Martin Willi
* Copyright (C) 2008 Tobias Brunner
* 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.
*/
#include "pkcs1_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 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 generic public key from an ASN.1 encoded blob
*/
static public_key_t *parse_public_key(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 || oid == OID_RSAES_OAEP)
{
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, 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);
}
DBG2(DBG_ASN, "-- > --");
key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, type,
BUILD_BLOB_ASN1_DER, object, BUILD_END);
DBG2(DBG_ASN, "-- < --");
break;
}
}
end:
parser->destroy(parser);
return key;
}
/**
* ASN.1 definition of RSApublicKey
*/
static const asn1Object_t pubkeyObjects[] = {
{ 0, "RSAPublicKey", ASN1_SEQUENCE, ASN1_OBJ }, /* 0 */
{ 1, "modulus", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "publicExponent", ASN1_INTEGER, ASN1_BODY }, /* 2 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PUB_KEY_RSA_PUBLIC_KEY 0
#define PUB_KEY_MODULUS 1
#define PUB_KEY_EXPONENT 2
/**
* Load a RSA public key from an ASN.1 encoded blob.
*/
static public_key_t *parse_rsa_public_key(chunk_t blob)
{
chunk_t n, e;
asn1_parser_t *parser;
chunk_t object;
int objectID;
bool success = FALSE;
parser = asn1_parser_create(pubkeyObjects, blob);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PUB_KEY_MODULUS:
n = object;
break;
case PUB_KEY_EXPONENT:
e = object;
break;
}
}
success = parser->success(parser);
parser->destroy(parser);
if (!success)
{
return NULL;
}
return lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
BUILD_RSA_MODULUS, n, BUILD_RSA_PUB_EXP, e, BUILD_END);
}
/**
* ASN.1 definition of a PKCS#1 RSA private key
*/
static const asn1Object_t privkeyObjects[] = {
{ 0, "RSAPrivateKey", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "modulus", ASN1_INTEGER, ASN1_BODY }, /* 2 */
{ 1, "publicExponent", ASN1_INTEGER, ASN1_BODY }, /* 3 */
{ 1, "privateExponent", ASN1_INTEGER, ASN1_BODY }, /* 4 */
{ 1, "prime1", ASN1_INTEGER, ASN1_BODY }, /* 5 */
{ 1, "prime2", ASN1_INTEGER, ASN1_BODY }, /* 6 */
{ 1, "exponent1", ASN1_INTEGER, ASN1_BODY }, /* 7 */
{ 1, "exponent2", ASN1_INTEGER, ASN1_BODY }, /* 8 */
{ 1, "coefficient", ASN1_INTEGER, ASN1_BODY }, /* 9 */
{ 1, "otherPrimeInfos", ASN1_SEQUENCE, ASN1_OPT |
ASN1_LOOP }, /* 10 */
{ 2, "otherPrimeInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 11 */
{ 3, "prime", ASN1_INTEGER, ASN1_BODY }, /* 12 */
{ 3, "exponent", ASN1_INTEGER, ASN1_BODY }, /* 13 */
{ 3, "coefficient", ASN1_INTEGER, ASN1_BODY }, /* 14 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 15 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PRIV_KEY_VERSION 1
#define PRIV_KEY_MODULUS 2
#define PRIV_KEY_PUB_EXP 3
#define PRIV_KEY_PRIV_EXP 4
#define PRIV_KEY_PRIME1 5
#define PRIV_KEY_PRIME2 6
#define PRIV_KEY_EXP1 7
#define PRIV_KEY_EXP2 8
#define PRIV_KEY_COEFF 9
/**
* Load a RSA private key from a ASN1 encoded blob.
*/
static private_key_t *parse_rsa_private_key(chunk_t blob)
{
chunk_t n, e, d, p, q, exp1, exp2, coeff;
asn1_parser_t *parser;
chunk_t object;
int objectID ;
bool success = FALSE;
parser = asn1_parser_create(privkeyObjects, blob);
parser->set_flags(parser, FALSE, TRUE);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PRIV_KEY_VERSION:
if (object.len > 0 && *object.ptr != 0)
{
DBG1(DBG_ASN, "PKCS#1 private key format is not version 1");
goto end;
}
break;
case PRIV_KEY_MODULUS:
n = object;
break;
case PRIV_KEY_PUB_EXP:
e = object;
break;
case PRIV_KEY_PRIV_EXP:
d = object;
break;
case PRIV_KEY_PRIME1:
p = object;
break;
case PRIV_KEY_PRIME2:
q = object;
break;
case PRIV_KEY_EXP1:
exp1 = object;
break;
case PRIV_KEY_EXP2:
exp2 = object;
break;
case PRIV_KEY_COEFF:
coeff = object;
break;
}
}
success = parser->success(parser);
end:
parser->destroy(parser);
if (!success)
{
return NULL;
}
return lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
BUILD_RSA_MODULUS, n, BUILD_RSA_PUB_EXP, e, BUILD_RSA_PRIV_EXP, d,
BUILD_RSA_PRIME1, p, BUILD_RSA_PRIME2, q, BUILD_RSA_EXP1, exp1,
BUILD_RSA_EXP2, exp2, BUILD_RSA_COEFF, coeff, BUILD_END);
}
/**
* See header.
*/
public_key_t *pkcs1_public_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;
}
switch (type)
{
case KEY_ANY:
return parse_public_key(blob);
case KEY_RSA:
return parse_rsa_public_key(blob);
default:
return NULL;
}
}
/**
* See header.
*/
private_key_t *pkcs1_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_rsa_private_key(blob);
}
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