/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Sun elects to use this software under the MPL license.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/kmem.h>
#else
#include <string.h>
#endif
#include "ec.h"
#include "ecl-curve.h"
#include "ecc_impl.h"
#include "secoidt.h"
#define CERTICOM_OID 0x2b, 0x81, 0x04
#define SECG_OID CERTICOM_OID, 0x00
#define ANSI_X962_OID 0x2a, 0x86, 0x48, 0xce, 0x3d
#define ANSI_X962_CURVE_OID ANSI_X962_OID, 0x03
#define ANSI_X962_GF2m_OID ANSI_X962_CURVE_OID, 0x00
#define ANSI_X962_GFp_OID ANSI_X962_CURVE_OID, 0x01
#define CONST_OID static const unsigned char
/* ANSI X9.62 prime curve OIDs */
/* NOTE: prime192v1 is the same as secp192r1, prime256v1 is the
* same as secp256r1
*/
CONST_OID ansiX962prime192v1[] = { ANSI_X962_GFp_OID, 0x01 };
CONST_OID ansiX962prime192v2[] = { ANSI_X962_GFp_OID, 0x02 };
CONST_OID ansiX962prime192v3[] = { ANSI_X962_GFp_OID, 0x03 };
CONST_OID ansiX962prime239v1[] = { ANSI_X962_GFp_OID, 0x04 };
CONST_OID ansiX962prime239v2[] = { ANSI_X962_GFp_OID, 0x05 };
CONST_OID ansiX962prime239v3[] = { ANSI_X962_GFp_OID, 0x06 };
CONST_OID ansiX962prime256v1[] = { ANSI_X962_GFp_OID, 0x07 };
/* SECG prime curve OIDs */
CONST_OID secgECsecp112r1[] = { SECG_OID, 0x06 };
CONST_OID secgECsecp112r2[] = { SECG_OID, 0x07 };
CONST_OID secgECsecp128r1[] = { SECG_OID, 0x1c };
CONST_OID secgECsecp128r2[] = { SECG_OID, 0x1d };
CONST_OID secgECsecp160k1[] = { SECG_OID, 0x09 };
CONST_OID secgECsecp160r1[] = { SECG_OID, 0x08 };
CONST_OID secgECsecp160r2[] = { SECG_OID, 0x1e };
CONST_OID secgECsecp192k1[] = { SECG_OID, 0x1f };
CONST_OID secgECsecp224k1[] = { SECG_OID, 0x20 };
CONST_OID secgECsecp224r1[] = { SECG_OID, 0x21 };
CONST_OID secgECsecp256k1[] = { SECG_OID, 0x0a };
CONST_OID secgECsecp384r1[] = { SECG_OID, 0x22 };
CONST_OID secgECsecp521r1[] = { SECG_OID, 0x23 };
/* SECG characterisitic two curve OIDs */
CONST_OID secgECsect113r1[] = {SECG_OID, 0x04 };
CONST_OID secgECsect113r2[] = {SECG_OID, 0x05 };
CONST_OID secgECsect131r1[] = {SECG_OID, 0x16 };
CONST_OID secgECsect131r2[] = {SECG_OID, 0x17 };
CONST_OID secgECsect163k1[] = {SECG_OID, 0x01 };
CONST_OID secgECsect163r1[] = {SECG_OID, 0x02 };
CONST_OID secgECsect163r2[] = {SECG_OID, 0x0f };
CONST_OID secgECsect193r1[] = {SECG_OID, 0x18 };
CONST_OID secgECsect193r2[] = {SECG_OID, 0x19 };
CONST_OID secgECsect233k1[] = {SECG_OID, 0x1a };
CONST_OID secgECsect233r1[] = {SECG_OID, 0x1b };
CONST_OID secgECsect239k1[] = {SECG_OID, 0x03 };
CONST_OID secgECsect283k1[] = {SECG_OID, 0x10 };
CONST_OID secgECsect283r1[] = {SECG_OID, 0x11 };
CONST_OID secgECsect409k1[] = {SECG_OID, 0x24 };
CONST_OID secgECsect409r1[] = {SECG_OID, 0x25 };
CONST_OID secgECsect571k1[] = {SECG_OID, 0x26 };
CONST_OID secgECsect571r1[] = {SECG_OID, 0x27 };
/* ANSI X9.62 characteristic two curve OIDs */
CONST_OID ansiX962c2pnb163v1[] = { ANSI_X962_GF2m_OID, 0x01 };
CONST_OID ansiX962c2pnb163v2[] = { ANSI_X962_GF2m_OID, 0x02 };
CONST_OID ansiX962c2pnb163v3[] = { ANSI_X962_GF2m_OID, 0x03 };
CONST_OID ansiX962c2pnb176v1[] = { ANSI_X962_GF2m_OID, 0x04 };
CONST_OID ansiX962c2tnb191v1[] = { ANSI_X962_GF2m_OID, 0x05 };
CONST_OID ansiX962c2tnb191v2[] = { ANSI_X962_GF2m_OID, 0x06 };
CONST_OID ansiX962c2tnb191v3[] = { ANSI_X962_GF2m_OID, 0x07 };
CONST_OID ansiX962c2onb191v4[] = { ANSI_X962_GF2m_OID, 0x08 };
CONST_OID ansiX962c2onb191v5[] = { ANSI_X962_GF2m_OID, 0x09 };
CONST_OID ansiX962c2pnb208w1[] = { ANSI_X962_GF2m_OID, 0x0a };
CONST_OID ansiX962c2tnb239v1[] = { ANSI_X962_GF2m_OID, 0x0b };
CONST_OID ansiX962c2tnb239v2[] = { ANSI_X962_GF2m_OID, 0x0c };
CONST_OID ansiX962c2tnb239v3[] = { ANSI_X962_GF2m_OID, 0x0d };
CONST_OID ansiX962c2onb239v4[] = { ANSI_X962_GF2m_OID, 0x0e };
CONST_OID ansiX962c2onb239v5[] = { ANSI_X962_GF2m_OID, 0x0f };
CONST_OID ansiX962c2pnb272w1[] = { ANSI_X962_GF2m_OID, 0x10 };
CONST_OID ansiX962c2pnb304w1[] = { ANSI_X962_GF2m_OID, 0x11 };
CONST_OID ansiX962c2tnb359v1[] = { ANSI_X962_GF2m_OID, 0x12 };
CONST_OID ansiX962c2pnb368w1[] = { ANSI_X962_GF2m_OID, 0x13 };
CONST_OID ansiX962c2tnb431r1[] = { ANSI_X962_GF2m_OID, 0x14 };
#define OI(x) { siDEROID, (unsigned char *)x, sizeof x }
#ifndef SECOID_NO_STRINGS
#define OD(oid,tag,desc,mech,ext) { OI(oid), tag, desc, mech, ext }
#else
#define OD(oid,tag,desc,mech,ext) { OI(oid), tag, 0, mech, ext }
#endif
#define CKM_INVALID_MECHANISM 0xffffffffUL
/* XXX this is incorrect */
#define INVALID_CERT_EXTENSION 1
#define CKM_ECDSA 0x00001041
#define CKM_ECDSA_SHA1 0x00001042
#define CKM_ECDH1_DERIVE 0x00001050
static SECOidData ANSI_prime_oids[] = {
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( ansiX962prime192v1, ECCurve_NIST_P192,
"ANSI X9.62 elliptic curve prime192v1 (aka secp192r1, NIST P-192)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime192v2, ECCurve_X9_62_PRIME_192V2,
"ANSI X9.62 elliptic curve prime192v2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime192v3, ECCurve_X9_62_PRIME_192V3,
"ANSI X9.62 elliptic curve prime192v3",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime239v1, ECCurve_X9_62_PRIME_239V1,
"ANSI X9.62 elliptic curve prime239v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime239v2, ECCurve_X9_62_PRIME_239V2,
"ANSI X9.62 elliptic curve prime239v2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime239v3, ECCurve_X9_62_PRIME_239V3,
"ANSI X9.62 elliptic curve prime239v3",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962prime256v1, ECCurve_NIST_P256,
"ANSI X9.62 elliptic curve prime256v1 (aka secp256r1, NIST P-256)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION )
};
static SECOidData SECG_oids[] = {
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( secgECsect163k1, ECCurve_NIST_K163,
"SECG elliptic curve sect163k1 (aka NIST K-163)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect163r1, ECCurve_SECG_CHAR2_163R1,
"SECG elliptic curve sect163r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect239k1, ECCurve_SECG_CHAR2_239K1,
"SECG elliptic curve sect239k1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect113r1, ECCurve_SECG_CHAR2_113R1,
"SECG elliptic curve sect113r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect113r2, ECCurve_SECG_CHAR2_113R2,
"SECG elliptic curve sect113r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp112r1, ECCurve_SECG_PRIME_112R1,
"SECG elliptic curve secp112r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp112r2, ECCurve_SECG_PRIME_112R2,
"SECG elliptic curve secp112r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp160r1, ECCurve_SECG_PRIME_160R1,
"SECG elliptic curve secp160r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp160k1, ECCurve_SECG_PRIME_160K1,
"SECG elliptic curve secp160k1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp256k1, ECCurve_SECG_PRIME_256K1,
"SECG elliptic curve secp256k1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( secgECsect163r2, ECCurve_NIST_B163,
"SECG elliptic curve sect163r2 (aka NIST B-163)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect283k1, ECCurve_NIST_K283,
"SECG elliptic curve sect283k1 (aka NIST K-283)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect283r1, ECCurve_NIST_B283,
"SECG elliptic curve sect283r1 (aka NIST B-283)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( secgECsect131r1, ECCurve_SECG_CHAR2_131R1,
"SECG elliptic curve sect131r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect131r2, ECCurve_SECG_CHAR2_131R2,
"SECG elliptic curve sect131r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect193r1, ECCurve_SECG_CHAR2_193R1,
"SECG elliptic curve sect193r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect193r2, ECCurve_SECG_CHAR2_193R2,
"SECG elliptic curve sect193r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect233k1, ECCurve_NIST_K233,
"SECG elliptic curve sect233k1 (aka NIST K-233)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect233r1, ECCurve_NIST_B233,
"SECG elliptic curve sect233r1 (aka NIST B-233)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp128r1, ECCurve_SECG_PRIME_128R1,
"SECG elliptic curve secp128r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp128r2, ECCurve_SECG_PRIME_128R2,
"SECG elliptic curve secp128r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp160r2, ECCurve_SECG_PRIME_160R2,
"SECG elliptic curve secp160r2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp192k1, ECCurve_SECG_PRIME_192K1,
"SECG elliptic curve secp192k1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp224k1, ECCurve_SECG_PRIME_224K1,
"SECG elliptic curve secp224k1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp224r1, ECCurve_NIST_P224,
"SECG elliptic curve secp224r1 (aka NIST P-224)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp384r1, ECCurve_NIST_P384,
"SECG elliptic curve secp384r1 (aka NIST P-384)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsecp521r1, ECCurve_NIST_P521,
"SECG elliptic curve secp521r1 (aka NIST P-521)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect409k1, ECCurve_NIST_K409,
"SECG elliptic curve sect409k1 (aka NIST K-409)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect409r1, ECCurve_NIST_B409,
"SECG elliptic curve sect409r1 (aka NIST B-409)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect571k1, ECCurve_NIST_K571,
"SECG elliptic curve sect571k1 (aka NIST K-571)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( secgECsect571r1, ECCurve_NIST_B571,
"SECG elliptic curve sect571r1 (aka NIST B-571)",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION )
};
static SECOidData ANSI_oids[] = {
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
/* ANSI X9.62 named elliptic curves (characteristic two field) */
OD( ansiX962c2pnb163v1, ECCurve_X9_62_CHAR2_PNB163V1,
"ANSI X9.62 elliptic curve c2pnb163v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2pnb163v2, ECCurve_X9_62_CHAR2_PNB163V2,
"ANSI X9.62 elliptic curve c2pnb163v2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2pnb163v3, ECCurve_X9_62_CHAR2_PNB163V3,
"ANSI X9.62 elliptic curve c2pnb163v3",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2pnb176v1, ECCurve_X9_62_CHAR2_PNB176V1,
"ANSI X9.62 elliptic curve c2pnb176v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb191v1, ECCurve_X9_62_CHAR2_TNB191V1,
"ANSI X9.62 elliptic curve c2tnb191v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb191v2, ECCurve_X9_62_CHAR2_TNB191V2,
"ANSI X9.62 elliptic curve c2tnb191v2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb191v3, ECCurve_X9_62_CHAR2_TNB191V3,
"ANSI X9.62 elliptic curve c2tnb191v3",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( ansiX962c2pnb208w1, ECCurve_X9_62_CHAR2_PNB208W1,
"ANSI X9.62 elliptic curve c2pnb208w1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb239v1, ECCurve_X9_62_CHAR2_TNB239V1,
"ANSI X9.62 elliptic curve c2tnb239v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb239v2, ECCurve_X9_62_CHAR2_TNB239V2,
"ANSI X9.62 elliptic curve c2tnb239v2",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb239v3, ECCurve_X9_62_CHAR2_TNB239V3,
"ANSI X9.62 elliptic curve c2tnb239v3",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
{ { siDEROID, NULL, 0 }, ECCurve_noName,
"Unknown OID", CKM_INVALID_MECHANISM, INVALID_CERT_EXTENSION },
OD( ansiX962c2pnb272w1, ECCurve_X9_62_CHAR2_PNB272W1,
"ANSI X9.62 elliptic curve c2pnb272w1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2pnb304w1, ECCurve_X9_62_CHAR2_PNB304W1,
"ANSI X9.62 elliptic curve c2pnb304w1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb359v1, ECCurve_X9_62_CHAR2_TNB359V1,
"ANSI X9.62 elliptic curve c2tnb359v1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2pnb368w1, ECCurve_X9_62_CHAR2_PNB368W1,
"ANSI X9.62 elliptic curve c2pnb368w1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION ),
OD( ansiX962c2tnb431r1, ECCurve_X9_62_CHAR2_TNB431R1,
"ANSI X9.62 elliptic curve c2tnb431r1",
CKM_INVALID_MECHANISM,
INVALID_CERT_EXTENSION )
};
SECOidData *
SECOID_FindOID(const SECItem *oid)
{
SECOidData *po;
SECOidData *ret;
int i;
if (oid->len == 8) {
if (oid->data[6] == 0x00) {
/* XXX bounds check */
po = &ANSI_oids[oid->data[7]];
if (memcmp(oid->data, po->oid.data, 8) == 0)
ret = po;
}
if (oid->data[6] == 0x01) {
/* XXX bounds check */
po = &ANSI_prime_oids[oid->data[7]];
if (memcmp(oid->data, po->oid.data, 8) == 0)
ret = po;
}
} else if (oid->len == 5) {
/* XXX bounds check */
po = &SECG_oids[oid->data[4]];
if (memcmp(oid->data, po->oid.data, 5) == 0)
ret = po;
} else {
ret = NULL;
}
return(ret);
}
ECCurveName
SECOID_FindOIDTag(const SECItem *oid)
{
SECOidData *oiddata;
oiddata = SECOID_FindOID (oid);
if (oiddata == NULL)
return ECCurve_noName;
return oiddata->offset;
}