348 lines
7.4 KiB
JavaScript
348 lines
7.4 KiB
JavaScript
'use strict';
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var x509 = module.exports;
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var ASN1 = require('./asn1/packer.js');
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var Asn1 = ASN1.Any;
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var UInt = ASN1.UInt;
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var BitStr = ASN1.BitStr;
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var Enc = require('@root/encoding');
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// 1.2.840.10045.3.1.7
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// prime256v1 (ANSI X9.62 named elliptic curve)
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var OBJ_ID_EC = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase();
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// 1.3.132.0.34
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// secp384r1 (SECG (Certicom) named elliptic curve)
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var OBJ_ID_EC_384 = '06 05 2B81040022'.replace(/\s+/g, '').toLowerCase();
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// 1.2.840.10045.2.1
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// ecPublicKey (ANSI X9.62 public key type)
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var OBJ_ID_EC_PUB = '06 07 2A8648CE3D0201'.replace(/\s+/g, '').toLowerCase();
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x509.parseSec1 = function parseEcOnlyPrivkey(u8, jwk) {
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var index = 7;
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var len = 32;
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var olen = OBJ_ID_EC.length / 2;
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if ('P-384' === jwk.crv) {
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olen = OBJ_ID_EC_384.length / 2;
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index = 8;
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len = 48;
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}
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if (len !== u8[index - 1]) {
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throw new Error('Unexpected bitlength ' + len);
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}
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// private part is d
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var d = u8.slice(index, index + len);
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// compression bit index
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var ci = index + len + 2 + olen + 2 + 3;
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var c = u8[ci];
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var x, y;
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if (0x04 === c) {
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y = u8.slice(ci + 1 + len, ci + 1 + len + len);
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} else if (0x02 !== c) {
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throw new Error('not a supported EC private key');
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}
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x = u8.slice(ci + 1, ci + 1 + len);
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return {
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kty: jwk.kty,
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crv: jwk.crv,
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d: Enc.bufToUrlBase64(d),
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//, dh: Enc.bufToHex(d)
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x: Enc.bufToUrlBase64(x),
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//, xh: Enc.bufToHex(x)
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y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.packPkcs1 = function(jwk) {
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var n = UInt(Enc.base64ToHex(jwk.n));
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var e = UInt(Enc.base64ToHex(jwk.e));
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if (!jwk.d) {
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return Enc.hexToBuf(Asn1('30', n, e));
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}
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return Enc.hexToBuf(
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Asn1(
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'30',
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UInt('00'),
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n,
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e,
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UInt(Enc.base64ToHex(jwk.d)),
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UInt(Enc.base64ToHex(jwk.p)),
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UInt(Enc.base64ToHex(jwk.q)),
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UInt(Enc.base64ToHex(jwk.dp)),
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UInt(Enc.base64ToHex(jwk.dq)),
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UInt(Enc.base64ToHex(jwk.qi))
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)
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);
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};
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x509.parsePkcs8 = function parseEcPkcs8(u8, jwk) {
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var index = 24 + OBJ_ID_EC.length / 2;
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var len = 32;
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if ('P-384' === jwk.crv) {
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index = 24 + OBJ_ID_EC_384.length / 2 + 2;
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len = 48;
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}
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//console.log(index, u8.slice(index));
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if (0x04 !== u8[index]) {
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//console.log(jwk);
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throw new Error('privkey not found');
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}
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var d = u8.slice(index + 2, index + 2 + len);
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var ci = index + 2 + len + 5;
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var xi = ci + 1;
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var x = u8.slice(xi, xi + len);
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var yi = xi + len;
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var y;
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if (0x04 === u8[ci]) {
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y = u8.slice(yi, yi + len);
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} else if (0x02 !== u8[ci]) {
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throw new Error('invalid compression bit (expected 0x04 or 0x02)');
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}
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return {
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kty: jwk.kty,
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crv: jwk.crv,
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d: Enc.bufToUrlBase64(d),
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//, dh: Enc.bufToHex(d)
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x: Enc.bufToUrlBase64(x),
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//, xh: Enc.bufToHex(x)
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y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.parseSpki = function parsePem(u8, jwk) {
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var ci = 16 + OBJ_ID_EC.length / 2;
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var len = 32;
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if ('P-384' === jwk.crv) {
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ci = 16 + OBJ_ID_EC_384.length / 2;
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len = 48;
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}
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var c = u8[ci];
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var xi = ci + 1;
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var x = u8.slice(xi, xi + len);
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var yi = xi + len;
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var y;
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if (0x04 === c) {
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y = u8.slice(yi, yi + len);
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} else if (0x02 !== c) {
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throw new Error('not a supported EC private key');
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}
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return {
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kty: jwk.kty,
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crv: jwk.crv,
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x: Enc.bufToUrlBase64(x),
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//, xh: Enc.bufToHex(x)
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y: Enc.bufToUrlBase64(y)
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//, yh: Enc.bufToHex(y)
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};
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};
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x509.parsePkix = x509.parseSpki;
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x509.packSec1 = function(jwk) {
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var d = Enc.base64ToHex(jwk.d);
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var x = Enc.base64ToHex(jwk.x);
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var y = Enc.base64ToHex(jwk.y);
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var objId = 'P-256' === jwk.crv ? OBJ_ID_EC : OBJ_ID_EC_384;
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return Enc.hexToBuf(
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Asn1(
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'30',
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UInt('01'),
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Asn1('04', d),
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Asn1('A0', objId),
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Asn1('A1', BitStr('04' + x + y))
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)
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);
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};
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/**
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* take a private jwk and creates a der from it
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* @param {*} jwk
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*/
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x509.packPkcs8 = function(jwk) {
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if ('RSA' === jwk.kty) {
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if (!jwk.d) {
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// Public RSA
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return Enc.hexToBuf(
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Asn1(
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'30',
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Asn1('30', Asn1('06', '2a864886f70d010101'), Asn1('05')),
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BitStr(
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Asn1(
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'30',
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UInt(Enc.base64ToHex(jwk.n)),
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UInt(Enc.base64ToHex(jwk.e))
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)
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)
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)
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);
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}
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// Private RSA
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return Enc.hexToBuf(
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Asn1(
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'30',
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UInt('00'),
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Asn1('30', Asn1('06', '2a864886f70d010101'), Asn1('05')),
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Asn1(
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'04',
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Asn1(
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'30',
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UInt('00'),
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UInt(Enc.base64ToHex(jwk.n)),
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UInt(Enc.base64ToHex(jwk.e)),
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UInt(Enc.base64ToHex(jwk.d)),
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UInt(Enc.base64ToHex(jwk.p)),
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UInt(Enc.base64ToHex(jwk.q)),
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UInt(Enc.base64ToHex(jwk.dp)),
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UInt(Enc.base64ToHex(jwk.dq)),
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UInt(Enc.base64ToHex(jwk.qi))
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)
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)
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)
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);
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}
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var d = Enc.base64ToHex(jwk.d);
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var x = Enc.base64ToHex(jwk.x);
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var y = Enc.base64ToHex(jwk.y);
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var objId = 'P-256' === jwk.crv ? OBJ_ID_EC : OBJ_ID_EC_384;
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return Enc.hexToBuf(
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Asn1(
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'30',
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UInt('00'),
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Asn1('30', OBJ_ID_EC_PUB, objId),
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Asn1(
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'04',
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Asn1(
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'30',
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UInt('01'),
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Asn1('04', d),
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Asn1('A1', BitStr('04' + x + y))
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)
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)
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)
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);
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};
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x509.packSpki = function(jwk) {
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if (/EC/i.test(jwk.kty)) {
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return x509.packSpkiEc(jwk);
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}
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return x509.packSpkiRsa(jwk);
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};
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x509.packSpkiRsa = function(jwk) {
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if (!jwk.d) {
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// Public RSA
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return Enc.hexToBuf(
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Asn1(
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'30',
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Asn1('30', Asn1('06', '2a864886f70d010101'), Asn1('05')),
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BitStr(
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Asn1(
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'30',
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UInt(Enc.base64ToHex(jwk.n)),
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UInt(Enc.base64ToHex(jwk.e))
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)
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)
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)
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);
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}
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// Private RSA
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return Enc.hexToBuf(
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Asn1(
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'30',
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UInt('00'),
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Asn1('30', Asn1('06', '2a864886f70d010101'), Asn1('05')),
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Asn1(
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'04',
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Asn1(
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'30',
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UInt('00'),
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UInt(Enc.base64ToHex(jwk.n)),
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UInt(Enc.base64ToHex(jwk.e)),
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UInt(Enc.base64ToHex(jwk.d)),
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UInt(Enc.base64ToHex(jwk.p)),
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UInt(Enc.base64ToHex(jwk.q)),
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UInt(Enc.base64ToHex(jwk.dp)),
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UInt(Enc.base64ToHex(jwk.dq)),
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UInt(Enc.base64ToHex(jwk.qi))
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)
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)
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)
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);
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};
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x509.packSpkiEc = function(jwk) {
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var x = Enc.base64ToHex(jwk.x);
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var y = Enc.base64ToHex(jwk.y);
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var objId = 'P-256' === jwk.crv ? OBJ_ID_EC : OBJ_ID_EC_384;
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return Enc.hexToBuf(
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Asn1('30', Asn1('30', OBJ_ID_EC_PUB, objId), BitStr('04' + x + y))
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);
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};
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x509.packPkix = x509.packSpki;
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x509.packCsrRsaPublicKey = function(jwk) {
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// Sequence the key
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var n = UInt(Enc.base64ToHex(jwk.n));
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var e = UInt(Enc.base64ToHex(jwk.e));
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var asn1pub = Asn1('30', n, e);
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// Add the CSR pub key header
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return Asn1(
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'30',
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Asn1('30', Asn1('06', '2a864886f70d010101'), Asn1('05')),
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BitStr(asn1pub)
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);
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};
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x509.packCsrEcPublicKey = function(jwk) {
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var ecOid = x509._oids[jwk.crv];
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if (!ecOid) {
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throw new Error(
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"Unsupported namedCurve '" +
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jwk.crv +
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"'. Supported types are " +
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Object.keys(x509._oids)
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);
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}
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var cmp = '04'; // 04 == x+y, 02 == x-only
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var hxy = '';
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// Placeholder. I'm not even sure if compression should be supported.
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if (!jwk.y) {
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cmp = '02';
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}
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hxy += Enc.base64ToHex(jwk.x);
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if (jwk.y) {
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hxy += Enc.base64ToHex(jwk.y);
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}
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// 1.2.840.10045.2.1 ecPublicKey
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return Asn1(
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'30',
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Asn1('30', Asn1('06', '2a8648ce3d0201'), Asn1('06', ecOid)),
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BitStr(cmp + hxy)
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);
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};
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x509._oids = {
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// 1.2.840.10045.3.1.7 prime256v1
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// (ANSI X9.62 named elliptic curve) (06 08 - 2A 86 48 CE 3D 03 01 07)
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'P-256': '2a8648ce3d030107',
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// 1.3.132.0.34 P-384 (06 05 - 2B 81 04 00 22)
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// (SEC 2 recommended EC domain secp256r1)
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'P-384': '2b81040022'
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// requires more logic and isn't a recommended standard
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// 1.3.132.0.35 P-521 (06 05 - 2B 81 04 00 23)
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// (SEC 2 alternate P-521)
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//, 'P-521': '2B 81 04 00 23'
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};
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