Chapril/xmpp.chapril.org-conversejs
Chapril/xmpp.chapril.org-conversejs
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Use raw key format and not jwk. Set correct key size.

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This commit is contained in:
JC Brand 2018-08-31 17:15:03 +02:00
parent ed9afe9afb
commit 6a061b4525
5 changed files with 100 additions and 94 deletions
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91
dist/converse.js vendored
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@ -71600,7 +71600,7 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
const TAG_LENGTH = 128;
const KEY_ALGO = {
'name': "AES-GCM",
'length': 256
'length': 128
};
function parseBundle(bundle_el) {
@ -71769,25 +71769,8 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
});
},
getKeyAndTag(string) {
return {
'key': string.slice(0, 43),
// 256bit key
'tag': string.slice(43, string.length) // rest is tag
};
},
decryptMessage(obj) {
const _converse = this.__super__._converse,
key_obj = {
"alg": "A256GCM",
"ext": true,
"k": obj.key,
"key_ops": ["encrypt", "decrypt"],
"kty": "oct"
};
return crypto.subtle.importKey('jwk', key_obj, KEY_ALGO, true, ['encrypt', 'decrypt']).then(key_obj => {
return crypto.subtle.importKey('raw', obj.key, KEY_ALGO, true, ['encrypt', 'decrypt']).then(key_obj => {
const algo = {
'name': "AES-GCM",
'iv': u.base64ToArrayBuffer(obj.iv),
@ -71810,17 +71793,17 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
decrypt(attrs) {
const _converse = this.__super__._converse,
address = new libsignal.SignalProtocolAddress(attrs.from, parseInt(attrs.encrypted.device_id, 10)),
session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address); // https://xmpp.org/extensions/xep-0384.html#usecases-receiving
session_cipher = this.getSessionCipher(attrs.from, parseInt(attrs.encrypted.device_id, 10)); // https://xmpp.org/extensions/xep-0384.html#usecases-receiving
if (attrs.encrypted.prekey === 'true') {
let plaintext;
return session_cipher.decryptPreKeyWhisperMessage(atob(attrs.encrypted.key), 'binary').then(key_and_tag => {
if (attrs.encrypted.payload) {
const aes_data = this.getKeyAndTag(u.arrayBufferToString(key_and_tag));
const key = key_and_tag.slice(0, 16),
tag = key_and_tag.slice(16);
return this.decryptMessage(_.extend(attrs.encrypted, {
'key': aes_data.key,
'tag': aes_data.tag
'key': key,
'tag': tag
}));
}
@ -71844,10 +71827,11 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
});
} else {
return session_cipher.decryptWhisperMessage(atob(attrs.encrypted.key), 'binary').then(key_and_tag => {
const aes_data = this.getKeyAndTag(u.arrayBufferToString(key_and_tag));
const key = key_and_tag.slice(0, 16),
tag = key_and_tag.slice(16);
return this.decryptMessage(_.extend(attrs.encrypted, {
'key': aes_data.key,
'tag': aes_data.tag
'key': key,
'tag': tag
}));
}).then(plaintext => _.extend(attrs, {
'plaintext': plaintext
@ -71911,12 +71895,11 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
};
return window.crypto.subtle.encrypt(algo, key, new TextEncoder().encode(plaintext));
}).then(ciphertext => {
return window.crypto.subtle.exportKey("jwk", key).then(key_obj => {
const tag = u.arrayBufferToBase64(ciphertext.slice(ciphertext.byteLength - (TAG_LENGTH + 7 >> 3)));
return window.crypto.subtle.exportKey("raw", key).then(key => {
const tag = ciphertext.slice(ciphertext.byteLength - (TAG_LENGTH + 7 >> 3));
return Promise.resolve({
'key': key_obj.k,
'tag': tag,
'key_and_tag': key_obj.k + tag,
'key': key,
'key_and_tag': u.appendArrayBuffer(key, tag),
'payload': u.arrayBufferToBase64(ciphertext),
'iv': u.arrayBufferToBase64(iv)
});
@ -71924,11 +71907,18 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
});
},
getSessionCipher(jid, id) {
if (!this.session_cipher) {
const _converse = this.__super__._converse,
address = new libsignal.SignalProtocolAddress(jid, id);
this.session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address);
}
return this.session_cipher;
},
encryptKey(plaintext, device) {
const _converse = this.__super__._converse,
address = new libsignal.SignalProtocolAddress(device.get('jid'), device.get('id')),
session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address);
return session_cipher.encrypt(plaintext).then(payload => ({
return this.getSessionCipher(device.get('jid'), device.get('id')).encrypt(plaintext).then(payload => ({
'payload': payload,
'device': device
}));
@ -71994,7 +71984,7 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
// devices associated with the contact, the result of this
// concatenation is encrypted using the corresponding
// long-standing SignalProtocol session.
const promises = devices.filter(device => device.get('trusted') != UNTRUSTED).map(device => this.encryptKey(obj.key_and_tag, device));
const promises = devices.filter(device => device.get('trusted') != UNTRUSTED).map(device => this.encryptKey(u.arrayBufferToString(obj.key_and_tag), device));
return Promise.all(promises).then(dicts => this.addKeysToMessageStanza(stanza, dicts, obj.iv)).then(stanza => {
stanza.c('payload').t(obj.payload).up().up();
stanza.c('store', {
@ -81292,26 +81282,37 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
return fp;
};
u.appendArrayBuffer = function (buffer1, buffer2) {
const tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
tmp.set(new Uint8Array(buffer1), 0);
tmp.set(new Uint8Array(buffer2), buffer1.byteLength);
return tmp.buffer;
};
u.arrayBufferToHex = function (ab) {
// https://stackoverflow.com/questions/40031688/javascript-arraybuffer-to-hex#40031979
return Array.prototype.map.call(new Uint8Array(ab), x => ('00' + x.toString(16)).slice(-2)).join('');
};
u.arrayBufferToString = function (ab) {
const enc = new TextDecoder("utf-8");
return enc.decode(ab);
return new Uint8Array(ab).reduce((data, byte) => data + String.fromCharCode(byte), '');
};
u.stringToArrayBuffer = function (string) {
const len = string.length,
bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = string.charCodeAt(i);
}
return bytes.buffer;
};
u.arrayBufferToBase64 = function (ab) {
return btoa(new Uint8Array(ab).reduce((data, byte) => data + String.fromCharCode(byte), ''));
};
u.stringToArrayBuffer = function (string) {
const enc = new TextEncoder(); // always utf-8
return enc.encode(string);
};
u.base64ToArrayBuffer = function (b64) {
const binary_string = window.atob(b64),
len = binary_string.length,

13
spec/omemo.js
View File

@ -88,9 +88,9 @@
.then((v) => {
view = v;
return view.model.encryptMessage(message);
}).then((payload) => {
}).then(payload => {
return view.model.decryptMessage(payload);
}).then((result) => {
}).then(result => {
expect(result).toBe(message);
done();
});
@ -199,10 +199,13 @@
// Test reception of an encrypted message
return view.model.encryptMessage('This is an encrypted message from the contact')
}).then((obj) => {
}).then(obj => {
// XXX: Normally the key will be encrypted via libsignal.
// However, we're mocking libsignal in the tests, so we include
// it as plaintext in the message.
// u.stringToArrayBuffer(atob(u.arrayBufferToBase64(obj.key_and_tag)));
// u.stringToArrayBuffer(u.arrayBufferToString(obj.key_and_tag));
const stanza = $msg({
'from': contact_jid,
'to': _converse.connection.jid,
@ -211,7 +214,7 @@
}).c('body').t('This is a fallback message').up()
.c('encrypted', {'xmlns': Strophe.NS.OMEMO})
.c('header', {'sid': '555'})
.c('key', {'rid': _converse.omemo_store.get('device_id')}).t(btoa(obj.key_and_tag)).up()
.c('key', {'rid': _converse.omemo_store.get('device_id')}).t(u.arrayBufferToBase64(obj.key_and_tag)).up()
.c('iv').t(obj.iv)
.up().up()
.c('payload').t(obj.payload);
@ -255,7 +258,7 @@
.c('key', {
'prekey': 'true',
'rid': _converse.omemo_store.get('device_id')
}).t(btoa(obj.key_and_tag)).up()
}).t(u.arrayBufferToBase64(obj.key_and_tag)).up()
.c('iv').t(obj.iv)
.up().up()
.c('payload').t(obj.payload);

64
src/converse-omemo.js
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@ -28,7 +28,7 @@
const TAG_LENGTH = 128;
const KEY_ALGO = {
'name': "AES-GCM",
'length': 256
'length': 128
};
@ -201,24 +201,9 @@
});
},
getKeyAndTag (string) {
return {
'key': string.slice(0, 43), // 256bit key
'tag': string.slice(43, string.length) // rest is tag
}
},
decryptMessage (obj) {
const { _converse } = this.__super__,
key_obj = {
"alg": "A256GCM",
"ext": true,
"k": obj.key,
"key_ops": ["encrypt","decrypt"],
"kty": "oct"
};
return crypto.subtle.importKey('jwk', key_obj, KEY_ALGO, true, ['encrypt','decrypt'])
.then((key_obj) => {
return crypto.subtle.importKey('raw', obj.key, KEY_ALGO, true, ['encrypt','decrypt'])
.then(key_obj => {
const algo = {
'name': "AES-GCM",
'iv': u.base64ToArrayBuffer(obj.iv),
@ -240,8 +225,7 @@
decrypt (attrs) {
const { _converse } = this.__super__,
address = new libsignal.SignalProtocolAddress(attrs.from, parseInt(attrs.encrypted.device_id, 10)),
session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address);
session_cipher = this.getSessionCipher(attrs.from, parseInt(attrs.encrypted.device_id, 10));
// https://xmpp.org/extensions/xep-0384.html#usecases-receiving
if (attrs.encrypted.prekey === 'true') {
@ -249,8 +233,9 @@
return session_cipher.decryptPreKeyWhisperMessage(atob(attrs.encrypted.key), 'binary')
.then(key_and_tag => {
if (attrs.encrypted.payload) {
const aes_data = this.getKeyAndTag(u.arrayBufferToString(key_and_tag));
return this.decryptMessage(_.extend(attrs.encrypted, {'key': aes_data.key, 'tag': aes_data.tag}));
const key = key_and_tag.slice(0, 16),
tag = key_and_tag.slice(16);
return this.decryptMessage(_.extend(attrs.encrypted, {'key': key, 'tag': tag}));
}
return Promise.resolve();
}).then(pt => {
@ -270,8 +255,9 @@
} else {
return session_cipher.decryptWhisperMessage(atob(attrs.encrypted.key), 'binary')
.then(key_and_tag => {
const aes_data = this.getKeyAndTag(u.arrayBufferToString(key_and_tag));
return this.decryptMessage(_.extend(attrs.encrypted, {'key': aes_data.key, 'tag': aes_data.tag}));
const key = key_and_tag.slice(0, 16),
tag = key_and_tag.slice(16);
return this.decryptMessage(_.extend(attrs.encrypted, {'key': key, 'tag': tag}));
}).then(plaintext => _.extend(attrs, {'plaintext': plaintext}))
.catch(e => {
this.reportDecryptionError(e);
@ -332,13 +318,12 @@
}
return window.crypto.subtle.encrypt(algo, key, new TextEncoder().encode(plaintext));
}).then(ciphertext => {
return window.crypto.subtle.exportKey("jwk", key)
.then(key_obj => {
const tag = u.arrayBufferToBase64(ciphertext.slice(ciphertext.byteLength - ((TAG_LENGTH + 7) >> 3)));
return window.crypto.subtle.exportKey("raw", key)
.then(key => {
const tag = ciphertext.slice(ciphertext.byteLength - ((TAG_LENGTH + 7) >> 3));
return Promise.resolve({
'key': key_obj.k,
'tag': tag,
'key_and_tag': key_obj.k + tag,
'key': key,
'key_and_tag': u.appendArrayBuffer(key, tag),
'payload': u.arrayBufferToBase64(ciphertext),
'iv': u.arrayBufferToBase64(iv)
});
@ -346,12 +331,19 @@
});
},
encryptKey (plaintext, device) {
const { _converse } = this.__super__,
address = new libsignal.SignalProtocolAddress(device.get('jid'), device.get('id')),
session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address);
getSessionCipher (jid, id) {
if (!this.session_cipher) {
const { _converse } = this.__super__,
address = new libsignal.SignalProtocolAddress(jid, id);
this.session_cipher = new window.libsignal.SessionCipher(_converse.omemo_store, address);
}
return this.session_cipher;
},
return session_cipher.encrypt(plaintext).then(payload => ({'payload': payload, 'device': device}));
encryptKey (plaintext, device) {
return this.getSessionCipher(device.get('jid'), device.get('id'))
.encrypt(plaintext)
.then(payload => ({'payload': payload, 'device': device}));
},
addKeysToMessageStanza (stanza, dicts, iv) {
@ -406,7 +398,7 @@
// long-standing SignalProtocol session.
const promises = devices
.filter(device => device.get('trusted') != UNTRUSTED)
.map(device => this.encryptKey(obj.key_and_tag, device));
.map(device => this.encryptKey(u.arrayBufferToString(obj.key_and_tag), device));
return Promise.all(promises)
.then(dicts => this.addKeysToMessageStanza(stanza, dicts, obj.iv))

25
src/utils/core.js
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@ -916,25 +916,36 @@
return fp;
};
u.appendArrayBuffer = function (buffer1, buffer2) {
const tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
tmp.set(new Uint8Array(buffer1), 0);
tmp.set(new Uint8Array(buffer2), buffer1.byteLength);
return tmp.buffer;
};
u.arrayBufferToHex = function (ab) {
// https://stackoverflow.com/questions/40031688/javascript-arraybuffer-to-hex#40031979
return Array.prototype.map.call(new Uint8Array(ab), x => ('00' + x.toString(16)).slice(-2)).join('');
};
u.arrayBufferToString = function (ab) {
const enc = new TextDecoder("utf-8");
return enc.decode(ab);
return (new Uint8Array(ab)).reduce((data, byte) => data + String.fromCharCode(byte), '');
};
u.stringToArrayBuffer = function (string) {
const len = string.length,
bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = string.charCodeAt(i)
}
return bytes.buffer
};
u.arrayBufferToBase64 = function (ab) {
return btoa((new Uint8Array(ab)).reduce((data, byte) => data + String.fromCharCode(byte), ''));
};
u.stringToArrayBuffer = function (string) {
const enc = new TextEncoder(); // always utf-8
return enc.encode(string);
};
u.base64ToArrayBuffer = function (b64) {
const binary_string = window.atob(b64),
len = binary_string.length,

1
tests/mock.js
View File

@ -22,7 +22,6 @@
'registrationId': '1337'
});
this.decryptPreKeyWhisperMessage = (key_and_tag) => {
// TODO: remove the prekey
return Promise.resolve(u.stringToArrayBuffer(key_and_tag));
};