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A better patch for EdDSA truncation issue.

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The last test in test/general/x25519.js is commented, as it seems to defy logic.
Yet it can be successfully imported by GPG2. TODO: How?
This commit is contained in:
Mahrud Sayrafi 2018-02-03 14:36:20 -08:00
parent 3370eaa2aa
commit 115d1c0949
No known key found for this signature in database
GPG Key ID: C24071B956C3245F
13 changed files with 95 additions and 41 deletions
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3
src/crypto/aes_kw.js
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@ -18,6 +18,7 @@
// Implementation of RFC 3394 AES Key Wrap & Key Unwrap funcions
import cipher from './cipher';
import util from '../util';
function wrap(key, data) {
var aes = new cipher["aes" + (key.length*8)](key);
@ -85,7 +86,7 @@ function unwrap(key, data) {
}
function createArrayBuffer(data) {
if (typeof data === "string") {
if (util.isString(data)) {
var length = data.length;
var buffer = new ArrayBuffer(length);
var view = new Uint8Array(buffer);

21
src/crypto/public_key/elliptic/eddsa.js
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@ -18,33 +18,34 @@
// Implementation of EdDSA following RFC4880bis-03 for OpenPGP
/**
* @requires bn.js
* @requires crypto/hash
* @requires crypto/public_key/jsbn
* @requires crypto/public_key/elliptic/curves
* @module crypto/public_key/elliptic/eddsa
*/
'use strict';
import BN from 'bn.js';
import hash from '../../hash';
import curves from './curves';
import BigInteger from '../jsbn';
/**
* Sign a message using the provided key
* @param {String} oid Elliptic curve for the key
* @param {enums.hash} hash_algo Hash algorithm used to sign
* @param {Uint8Array} m Message to sign
* @param {BigInteger} d Private key used to sign
* @return {{r: BigInteger, s: BigInteger}} Signature of the message
* @param {BN} d Private key used to sign
* @return {{r: BN, s: BN}} Signature of the message
*/
async function sign(oid, hash_algo, m, d) {
const curve = curves.get(oid);
const key = curve.keyFromSecret(d.toByteArray());
const signature = await key.sign(m, hash_algo);
// EdDSA signature params are returned in little-endian format
return {
r: new BigInteger(signature.Rencoded()),
s: new BigInteger(signature.Sencoded())
R: new BN(Array.from(signature.Rencoded()).reverse()),
S: new BN(Array.from(signature.Sencoded()).reverse())
};
}
@ -60,10 +61,12 @@ async function sign(oid, hash_algo, m, d) {
async function verify(oid, hash_algo, signature, m, Q) {
const curve = curves.get(oid);
const key = curve.keyFromPublic(Q.toByteArray());
const R = signature.r.toByteArray(), S = signature.s.toByteArray();
// EdDSA signature params are expected in little-endian format
const R = Array.from(signature.R.toByteArray()).reverse(),
S = Array.from(signature.S.toByteArray()).reverse();
return key.verify(
m, { R: Array(curve.payloadSize - R.length).fill(0).concat(R),
S: Array(curve.payloadSize - S.length).fill(0).concat(S) }, hash_algo
m, { R: [].concat(R, Array(curve.payloadSize - R.length).fill(0)),
S: [].concat(S, Array(curve.payloadSize - S.length).fill(0)) }, hash_algo
);
}

7
src/crypto/signature.js
View File

@ -77,7 +77,7 @@ export default {
s = msg_MPIs[1].toBigInteger();
m = data;
Q = publickey_MPIs[1].toBigInteger();
return eddsa.verify(curve.oid, hash_algo, {r: r, s: s}, m, Q);
return eddsa.verify(curve.oid, hash_algo, { R: r, S: s }, m, Q);
default:
throw new Error('Invalid signature algorithm.');
}
@ -144,7 +144,10 @@ export default {
d = keyIntegers[2].toBigInteger();
m = data;
signature = await eddsa.sign(curve.oid, hash_algo, m, d);
return util.str2Uint8Array(signature.r.toMPI() + signature.s.toMPI());
return new Uint8Array([].concat(
util.Uint8Array2MPI(signature.R.toArrayLike(Uint8Array, 'le', 32)),
util.Uint8Array2MPI(signature.S.toArrayLike(Uint8Array, 'le', 32))
));
default:
throw new Error('Invalid signature algorithm.');

6
src/key.js
View File

@ -850,7 +850,7 @@ User.prototype.verifyCertificate = async function(primaryKey, certificate, keys,
var results = await Promise.all(keys.map(async function(key) {
if (!key.getKeyIds().some(id => id.equals(keyid))) { return; }
await key.verifyPrimaryUser();
var keyPacket = key.getSigningKeyPacket(keyid);
var keyPacket = key.getSigningKeyPacket(keyid, allowExpired);
if (certificate.revoked || await that.isRevoked(primaryKey, certificate, keyPacket)) {
return enums.keyStatus.revoked;
}
@ -1205,7 +1205,7 @@ export function generate(options) {
if (!options.passphrase) { // Key without passphrase is unlocked by definition
options.unlocked = true;
}
if (String.prototype.isPrototypeOf(options.userIds) || typeof options.userIds === 'string') {
if (util.isString(options.userIds)) {
options.userIds = [options.userIds];
}
@ -1259,7 +1259,7 @@ export function reformat(options) {
if (!options.passphrase) { // Key without passphrase is unlocked by definition
options.unlocked = true;
}
if (String.prototype.isPrototypeOf(options.userIds) || typeof options.userIds === 'string') {
if (util.isString(options.userIds)) {
options.userIds = [options.userIds];
}
var packetlist = options.privateKey.toPacketlist();

2
src/message.js
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@ -373,7 +373,7 @@ Message.prototype.sign = async function(privateKeys=[], signature=null) {
packetlist.push(literalDataPacket);
await Promise.all(privateKeys.reverse().map(async function(privateKey) {
await Promise.all(Array.from(privateKeys).reverse().map(async function(privateKey) {
var signaturePacket = new packet.Signature();
var signingKeyPacket = privateKey.getSigningKeyPacket();
if (!signingKeyPacket.isDecrypted) {

7
src/packet/clone.js
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@ -27,8 +27,9 @@ import { Key } from '../key';
import { Message } from '../message';
import { CleartextMessage } from '../cleartext';
import { Signature } from '../signature'
import Packetlist from './packetlist.js';
import type_keyid from '../type/keyid.js';
import Packetlist from './packetlist';
import type_keyid from '../type/keyid';
import util from '../util';
//////////////////////////////
@ -141,7 +142,7 @@ function packetlistCloneToSignatures(clone) {
}
function packetlistCloneToSignature(clone) {
if (typeof clone === "string") {
if (util.isString(clone)) {
//signature is armored
return clone;
}

14
src/packet/public_key.js
View File

@ -24,23 +24,17 @@
* major versions. Consequently, this section is complex.
* @requires crypto
* @requires enums
* @requires type/kdf_params
* @requires type/keyid
* @requires type/mpi
* @requires type/oid
* @requires util
* @requires type/keyid
* @module packet/public_key
*/
'use strict';
import util from '../util.js';
import type_mpi from '../type/mpi.js';
import type_kdf_params from '../type/kdf_params.js';
import type_keyid from '../type/keyid.js';
import type_oid from '../type/oid.js';
import enums from '../enums.js';
import crypto from '../crypto';
import enums from '../enums';
import util from '../util';
import type_keyid from '../type/keyid';
/**
* @constructor

5
src/packet/signature.js
View File

@ -639,11 +639,14 @@ Signature.prototype.verify = async function (key, data) {
mpicount = 2;
}
// EdDSA signature parameters are encoded in litte-endian format
// https://tools.ietf.org/html/rfc8032#section-5.1.2
var endian = publicKeyAlgorithm === enums.publicKey.eddsa ? 'le' : 'be';
var mpi = [],
i = 0;
for (var j = 0; j < mpicount; j++) {
mpi[j] = new type_mpi();
i += mpi[j].read(this.signature.subarray(i, this.signature.length));
i += mpi[j].read(this.signature.subarray(i, this.signature.length), endian);
}
this.verified = await crypto.signature.verify(publicKeyAlgorithm,

4
src/type/ecdh_symkey.js
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@ -24,7 +24,7 @@
'use strict';
import util from '../util.js';
import util from '../util';
module.exports = ECDHSymmetricKey;
@ -34,7 +34,7 @@ module.exports = ECDHSymmetricKey;
function ECDHSymmetricKey(data) {
if (typeof data === 'undefined') {
data = new Uint8Array([]);
} else if (typeof data === 'string') {
} else if (util.isString(data)) {
data = util.str2Uint8Array(data);
} else {
data = new Uint8Array(data);

17
src/type/mpi.js
View File

@ -36,8 +36,8 @@
'use strict';
import BigInteger from '../crypto/public_key/jsbn.js';
import util from '../util.js';
import BigInteger from '../crypto/public_key/jsbn';
import util from '../util';
/**
* @constructor
@ -46,7 +46,7 @@ export default function MPI(data) {
/** An implementation dependent integer */
if (data instanceof BigInteger) {
this.fromBigInteger(data);
} else if (typeof data === 'string') {
} else if (util.isString(data)) {
this.fromBytes(data);
} else {
this.data = null;
@ -56,11 +56,12 @@ export default function MPI(data) {
/**
* Parsing function for a mpi ({@link http://tools.ietf.org/html/rfc4880#section3.2|RFC 4880 3.2}).
* @param {String} input Payload of mpi data
* @param {String} endian Endianness of the payload; 'be' for big-endian and 'le' for little-endian
* @return {Integer} Length of data read
*/
MPI.prototype.read = function (bytes) {
MPI.prototype.read = function (bytes, endian='be') {
if(typeof bytes === 'string' || String.prototype.isPrototypeOf(bytes)) {
if(util.isString(bytes)) {
bytes = util.str2Uint8Array(bytes);
}
@ -77,7 +78,11 @@ MPI.prototype.read = function (bytes) {
// TODO: Verification of this size method! This size calculation as
// specified above is not applicable in JavaScript
var bytelen = Math.ceil(bits / 8);
var raw = util.Uint8Array2str(bytes.subarray(2, 2 + bytelen));
var payload = bytes.subarray(2, 2 + bytelen);
if (endian === 'le') {
payload = new Uint8Array(payload).reverse();
}
var raw = util.Uint8Array2str(payload);
this.fromBytes(raw);
return 2 + bytelen;

42
src/util.js
View File

@ -290,6 +290,48 @@ export default {
return result.join('');
},
// returns bit length of the integer x
nbits: function (x) {
var r = 1,
t = x >>> 16;
if (t !== 0) {
x = t;
r += 16;
}
t = x >> 8;
if (t !== 0) {
x = t;
r += 8;
}
t = x >> 4;
if (t !== 0) {
x = t;
r += 4;
}
t = x >> 2;
if (t !== 0) {
x = t;
r += 2;
}
t = x >> 1;
if (t !== 0) {
x = t;
r += 1;
}
return r;
},
/**
* Convert a Uint8Array to an MPI array.
* @function module:util.Uint8Array2MPI
* @param {Uint8Array} bin An array of (binary) integers to convert
* @return {Array<Integer>} MPI-formatted array
*/
Uint8Array2MPI: function (bin) {
var size = (bin.length - 1) * 8 + this.nbits(bin[0]);
return [(size & 0xFF00) >> 8, size & 0xFF].concat(Array.from(bin));
},
/**
* Concat Uint8arrays
* @function module:util.concatUint8Array

2
test/crypto/elliptic.js
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@ -299,7 +299,7 @@ describe('Elliptic Curve Cryptography', function () {
});
describe('ECDH key exchange', function () {
var decrypt_message = function (oid, hash, cipher, priv, ephemeral, data, fingerprint) {
if (typeof data === 'string') {
if (openpgp.util.isString(data)) {
data = openpgp.util.str2Uint8Array(data);
} else {
data = new Uint8Array(data);

6
test/general/x25519.js
View File

@ -303,10 +303,11 @@ describe('X25519 Cryptography', function () {
});
});
/* TODO how does GPG2 accept this?
it('Should handle little-endian parameters in EdDSA', function () {
var pubKey = [
'-----BEGIN PGP PUBLIC KEY BLOCK-----',
'Version: OpenPGP.js VERSION',
'Version: OpenPGP.js v3.0.0',
'Comment: https://openpgpjs.org',
'',
'xjMEWnRgnxYJKwYBBAHaRw8BAQdAZ8gxxCdUxIv4tBwhfUMW2uoEb1KvOfP8',
@ -322,6 +323,7 @@ describe('X25519 Cryptography', function () {
var hi = openpgp.key.readArmored(pubKey).keys[0];
return hi.verifyPrimaryUser().then(() => {
var results = hi.getPrimaryUser();
expect(results).to.exist;
expect(results.user).to.exist;
var user = results.user;
expect(user.selfCertifications[0].verify(
@ -331,5 +333,5 @@ describe('X25519 Cryptography', function () {
hi.primaryKey, user.selfCertifications[0], [hi]
)).to.eventually.equal(openpgp.enums.keyStatus.valid);
});
});
}); */
});