494 lines
14 KiB
JavaScript
494 lines
14 KiB
JavaScript
'use strict';
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var EC = module.exports;
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var Enc = require('./encoding.js');
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var ASN1;
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var PEM = require('./pem.js');
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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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// 19 e c d s a - s h a 2 - n i s t p 2 5 6
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var SSH_EC_P256 = '00000013 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36'
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.replace(/\s+/g, '').toLowerCase();
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// 19 e c d s a - s h a 2 - n i s t p 3 8 4
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var SSH_EC_P384 = '00000013 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34'
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.replace(/\s+/g, '').toLowerCase();
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// The one good thing that came from the b***kchain hysteria: good EC documentation
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// https://davidederosa.com/basic-blockchain-programming/elliptic-curve-keys/
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EC.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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EC.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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EC.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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EC.parsePkix = EC.parseSpki;
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EC.parseSsh = function (pem) {
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var jwk = { kty: 'EC', crv: null, x: null, y: null };
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var b64 = pem.split(/\s+/g)[1];
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var buf = Buffer.from(b64, 'base64');
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var hex = Enc.bufToHex(buf);
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var index = 40;
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var len;
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if (0 === hex.indexOf(SSH_EC_P256)) {
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jwk.crv = 'P-256';
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len = 32;
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} else if (0 === hex.indexOf(SSH_EC_P384)) {
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jwk.crv = 'P-384';
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len = 48;
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}
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var x = buf.slice(index, index + len);
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var y = buf.slice(index + len, index + len + len);
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jwk.x = Enc.bufToUrlBase64(x);
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jwk.y = Enc.bufToUrlBase64(y);
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return jwk;
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};
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/*global Promise*/
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EC.generate = function (opts) {
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return Promise.resolve().then(function () {
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var typ = 'ec';
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var format = opts.format;
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var encoding = opts.encoding;
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var priv;
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var pub = 'spki';
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if (!format) {
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format = 'jwk';
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}
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if (-1 !== [ 'spki', 'pkcs8', 'ssh' ].indexOf(format)) {
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format = 'pkcs8';
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}
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if ('pem' === format) {
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format = 'sec1';
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encoding = 'pem';
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} else if ('der' === format) {
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format = 'sec1';
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encoding = 'der';
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}
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if ('jwk' === format || 'json' === format) {
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format = 'jwk';
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encoding = 'json';
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} else {
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priv = format;
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}
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if (!encoding) {
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encoding = 'pem';
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}
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if (priv) {
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priv = { type: priv, format: encoding };
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pub = { type: pub, format: encoding };
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} else {
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// jwk
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priv = { type: 'sec1', format: 'pem' };
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pub = { type: 'spki', format: 'pem' };
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}
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return new Promise(function (resolve, reject) {
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return require('crypto').generateKeyPair(typ, {
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namedCurve: opts.crv || opts.namedCurve || 'P-256'
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, privateKeyEncoding: priv
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, publicKeyEncoding: pub
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}, function (err, pubkey, privkey) {
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if (err) { reject(err); }
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resolve({
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private: privkey
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, public: pubkey
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});
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});
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}).then(function (keypair) {
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if ('jwk' === format) {
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return {
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private: EC.importSync({ pem: keypair.private, format: priv.type })
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, public: EC.importSync({ pem: keypair.public, format: pub.type, public: true })
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};
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}
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if ('ssh' !== opts.format) {
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return keypair;
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}
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return {
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private: keypair.private
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, public: EC.exportSync({ jwk: EC.importSync({
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pem: keypair.public, format: format, public: true
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}), format: opts.format, public: true })
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};
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});
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});
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};
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EC.importSync = function importEcSync(opts) {
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if (!opts || !opts.pem || 'string' !== typeof opts.pem) {
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throw new Error("must pass { pem: pem } as a string");
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}
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if (0 === opts.pem.indexOf('ecdsa-sha2-')) {
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return EC.parseSsh(opts.pem);
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}
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var pem = opts.pem;
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var u8 = PEM.parseBlock(pem).bytes;
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var hex = Enc.bufToHex(u8);
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var jwk = { kty: 'EC', crv: null, x: null, y: null };
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//console.log();
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if (-1 !== hex.indexOf(OBJ_ID_EC)) {
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jwk.crv = "P-256";
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// PKCS8
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if (0x02 === u8[3] && 0x30 === u8[6] && 0x06 === u8[8]) {
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//console.log("PKCS8", u8[3].toString(16), u8[6].toString(16), u8[8].toString(16));
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jwk = EC.parsePkcs8(u8, jwk);
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// EC-only
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} else if (0x02 === u8[2] && 0x04 === u8[5] && 0xA0 === u8[39]) {
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//console.log("EC---", u8[2].toString(16), u8[5].toString(16), u8[39].toString(16));
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jwk = EC.parseSec1(u8, jwk);
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// SPKI/PKIK (Public)
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} else if (0x30 === u8[2] && 0x06 === u8[4] && 0x06 === u8[13]) {
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//console.log("SPKI-", u8[2].toString(16), u8[4].toString(16), u8[13].toString(16));
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jwk = EC.parseSpki(u8, jwk);
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// Error
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} else {
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//console.log("PKCS8", u8[3].toString(16), u8[6].toString(16), u8[8].toString(16));
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//console.log("EC---", u8[2].toString(16), u8[5].toString(16), u8[39].toString(16));
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//console.log("SPKI-", u8[2].toString(16), u8[4].toString(16), u8[13].toString(16));
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throw new Error("unrecognized key format");
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}
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} else if (-1 !== hex.indexOf(OBJ_ID_EC_384)) {
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jwk.crv = "P-384";
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// PKCS8
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if (0x02 === u8[3] && 0x30 === u8[6] && 0x06 === u8[8]) {
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//console.log("PKCS8", u8[3].toString(16), u8[6].toString(16), u8[8].toString(16));
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jwk = EC.parsePkcs8(u8, jwk);
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// EC-only
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} else if (0x02 === u8[3] && 0x04 === u8[6] && 0xA0 === u8[56]) {
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//console.log("EC---", u8[3].toString(16), u8[6].toString(16), u8[56].toString(16));
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jwk = EC.parseSec1(u8, jwk);
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// SPKI/PKIK (Public)
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} else if (0x30 === u8[2] && 0x06 === u8[4] && 0x06 === u8[13]) {
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//console.log("SPKI-", u8[2].toString(16), u8[4].toString(16), u8[13].toString(16));
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jwk = EC.parseSpki(u8, jwk);
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// Error
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} else {
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//console.log("PKCS8", u8[3].toString(16), u8[6].toString(16), u8[8].toString(16));
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//console.log("EC---", u8[3].toString(16), u8[6].toString(16), u8[56].toString(16));
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//console.log("SPKI-", u8[2].toString(16), u8[4].toString(16), u8[13].toString(16));
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throw new Error("unrecognized key format");
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}
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} else {
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throw new Error("Supported key types are P-256 and P-384");
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}
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if (opts.public) {
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if (true !== opts.public) {
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throw new Error("options.public must be either `true` or `false` not ("
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+ typeof opts.public + ") '" + opts.public + "'");
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}
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delete jwk.d;
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}
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return jwk;
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};
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EC.parse = function parseEc(opts) {
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return Promise.resolve().then(function () {
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return EC.importSync(opts);
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});
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};
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EC.toJwk = EC.import = EC.parse;
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EC.exportSync = function (opts) {
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if (!opts || !opts.jwk || 'object' !== typeof opts.jwk) {
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throw new Error("must pass { jwk: jwk } as a JSON object");
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}
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var jwk = JSON.parse(JSON.stringify(opts.jwk));
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var format = opts.format;
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if (opts.public || -1 !== [ 'spki', 'pkix', 'ssh', 'rfc4716' ].indexOf(format)) {
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jwk.d = null;
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}
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if ('EC' !== jwk.kty) {
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throw new Error("options.jwk.kty must be 'EC' for EC keys");
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}
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if (!jwk.d) {
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if (!format || -1 !== [ 'spki', 'pkix' ].indexOf(format)) {
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format = 'spki';
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} else if (-1 !== [ 'ssh', 'rfc4716' ].indexOf(format)) {
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format = 'ssh';
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} else {
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throw new Error("options.format must be 'spki' or 'ssh' for public EC keys, not ("
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+ typeof format + ") " + format);
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}
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} else {
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if (!format || 'sec1' === format) {
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format = 'sec1';
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} else if ('pkcs8' !== format) {
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throw new Error("options.format must be 'sec1' or 'pkcs8' for private EC keys, not '" + format + "'");
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}
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}
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if (-1 === [ 'P-256', 'P-384' ].indexOf(jwk.crv)) {
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throw new Error("options.jwk.crv must be either P-256 or P-384 for EC keys, not '" + jwk.crv + "'");
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}
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if (!jwk.y) {
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throw new Error("options.jwk.y must be a urlsafe base64-encoded either P-256 or P-384");
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}
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if ('sec1' === format) {
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return PEM.packBlock({ type: "EC PRIVATE KEY", bytes: EC.packSec1(jwk) });
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} else if ('pkcs8' === format) {
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return PEM.packBlock({ type: "PRIVATE KEY", bytes: EC.packPkcs8(jwk) });
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} else if (-1 !== [ 'spki', 'pkix' ].indexOf(format)) {
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return PEM.packBlock({ type: "PUBLIC KEY", bytes: EC.packSpki(jwk) });
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} else if (-1 !== [ 'ssh', 'rfc4716' ].indexOf(format)) {
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return EC.packSsh(jwk);
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} else {
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throw new Error("Sanity Error: reached unreachable code block with format: " + format);
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}
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};
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EC.pack = function (opts) {
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return Promise.resolve().then(function () {
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return EC.exportSync(opts);
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});
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};
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EC.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.hexToUint8(
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ASN1('30'
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, ASN1.UInt('01')
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, ASN1('04', d)
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, ASN1('A0', objId)
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, ASN1('A1', ASN1.BitStr('04' + x + y)))
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);
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};
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EC.packPkcs8 = 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.hexToUint8(
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ASN1('30'
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, ASN1.UInt('00')
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, ASN1('30'
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, OBJ_ID_EC_PUB
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, objId
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)
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, ASN1('04'
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, ASN1('30'
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, ASN1.UInt('01')
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, ASN1('04', d)
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, ASN1('A1', ASN1.BitStr('04' + x + y)))))
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);
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};
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EC.packSpki = 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.hexToUint8(
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ASN1('30'
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, ASN1('30'
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, OBJ_ID_EC_PUB
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, objId
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)
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, ASN1.BitStr('04' + x + y))
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);
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};
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EC.packPkix = EC.packSpki;
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EC.packSsh = function (jwk) {
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// Custom SSH format
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var typ = 'ecdsa-sha2-nistp256';
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var a = '32 35 36';
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var b = '41';
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var comment = jwk.crv + '@localhost';
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if ('P-256' !== jwk.crv) {
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typ = 'ecdsa-sha2-nistp384';
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a = '33 38 34';
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b = '61';
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}
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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 ssh = Enc.hexToUint8(
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('00 00 00 13 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70'
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+ a + '00 00 00 08 6e 69 73 74 70' + a + '00 00 00' + b
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+ '04' + x + y).replace(/\s+/g, '').toLowerCase()
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);
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return typ + ' ' + Enc.bufToBase64(ssh) + ' ' + comment;
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};
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//
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// A dumbed-down, minimal ASN.1 packer
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//
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// Almost every ASN.1 type that's important for CSR
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// can be represented generically with only a few rules.
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ASN1 = function ASN1(/*type, hexstrings...*/) {
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var args = Array.prototype.slice.call(arguments);
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var typ = args.shift();
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var str = args.join('').replace(/\s+/g, '').toLowerCase();
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var len = (str.length/2);
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var lenlen = 0;
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var hex = typ;
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// We can't have an odd number of hex chars
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if (len !== Math.round(len)) {
|
|
throw new Error("invalid hex");
|
|
}
|
|
|
|
// The first byte of any ASN.1 sequence is the type (Sequence, Integer, etc)
|
|
// The second byte is either the size of the value, or the size of its size
|
|
|
|
// 1. If the second byte is < 0x80 (128) it is considered the size
|
|
// 2. If it is > 0x80 then it describes the number of bytes of the size
|
|
// ex: 0x82 means the next 2 bytes describe the size of the value
|
|
// 3. The special case of exactly 0x80 is "indefinite" length (to end-of-file)
|
|
|
|
if (len > 127) {
|
|
lenlen += 1;
|
|
while (len > 255) {
|
|
lenlen += 1;
|
|
len = len >> 8;
|
|
}
|
|
}
|
|
|
|
if (lenlen) { hex += Enc.numToHex(0x80 + lenlen); }
|
|
return hex + Enc.numToHex(str.length/2) + str;
|
|
};
|
|
|
|
// The Integer type has some special rules
|
|
ASN1.UInt = function UINT() {
|
|
var str = Array.prototype.slice.call(arguments).join('');
|
|
var first = parseInt(str.slice(0, 2), 16);
|
|
|
|
// If the first byte is 0x80 or greater, the number is considered negative
|
|
// Therefore we add a '00' prefix if the 0x80 bit is set
|
|
if (0x80 & first) { str = '00' + str; }
|
|
|
|
return ASN1('02', str);
|
|
};
|
|
|
|
// The Bit String type also has a special rule
|
|
ASN1.BitStr = function BITSTR() {
|
|
var str = Array.prototype.slice.call(arguments).join('');
|
|
// '00' is a mask of how many bits of the next byte to ignore
|
|
return ASN1('03', '00' + str);
|
|
};
|
|
|
|
EC.toPem = EC.export = EC.pack;
|