fox-send/app/keychain.js

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import { arrayToB64, b64ToArray } from './utils';
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import { decryptStream, encryptStream } from './ece.js';
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const encoder = new TextEncoder();
const decoder = new TextDecoder();
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export default class Keychain {
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constructor(secretKeyB64, nonce) {
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this._nonce = nonce || 'yRCdyQ1EMSA3mo4rqSkuNQ==';
if (secretKeyB64) {
this.rawSecret = b64ToArray(secretKeyB64);
} else {
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this.rawSecret = crypto.getRandomValues(new Uint8Array(16));
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}
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this.secretKeyPromise = crypto.subtle.importKey(
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'raw',
this.rawSecret,
'HKDF',
false,
['deriveKey']
);
this.encryptKeyPromise = this.secretKeyPromise.then(function(secretKey) {
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return crypto.subtle.deriveKey(
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{
name: 'HKDF',
salt: new Uint8Array(),
info: encoder.encode('encryption'),
hash: 'SHA-256'
},
secretKey,
{
name: 'AES-GCM',
length: 128
},
false,
['encrypt', 'decrypt']
);
});
this.metaKeyPromise = this.secretKeyPromise.then(function(secretKey) {
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return crypto.subtle.deriveKey(
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{
name: 'HKDF',
salt: new Uint8Array(),
info: encoder.encode('metadata'),
hash: 'SHA-256'
},
secretKey,
{
name: 'AES-GCM',
length: 128
},
false,
['encrypt', 'decrypt']
);
});
this.authKeyPromise = this.secretKeyPromise.then(function(secretKey) {
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return crypto.subtle.deriveKey(
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{
name: 'HKDF',
salt: new Uint8Array(),
info: encoder.encode('authentication'),
hash: 'SHA-256'
},
secretKey,
{
name: 'HMAC',
hash: { name: 'SHA-256' }
},
true,
['sign']
);
});
}
get nonce() {
return this._nonce;
}
set nonce(n) {
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if (n && n !== this._nonce) {
this._nonce = n;
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}
}
setPassword(password, shareUrl) {
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this.authKeyPromise = crypto.subtle
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.importKey('raw', encoder.encode(password), { name: 'PBKDF2' }, false, [
'deriveKey'
])
.then(passwordKey =>
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crypto.subtle.deriveKey(
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{
name: 'PBKDF2',
salt: encoder.encode(shareUrl),
iterations: 100,
hash: 'SHA-256'
},
passwordKey,
{
name: 'HMAC',
hash: 'SHA-256'
},
true,
['sign']
)
);
}
setAuthKey(authKeyB64) {
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this.authKeyPromise = crypto.subtle.importKey(
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'raw',
b64ToArray(authKeyB64),
{
name: 'HMAC',
hash: 'SHA-256'
},
true,
['sign']
);
}
async authKeyB64() {
const authKey = await this.authKeyPromise;
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const rawAuth = await crypto.subtle.exportKey('raw', authKey);
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return arrayToB64(new Uint8Array(rawAuth));
}
async authHeader() {
const authKey = await this.authKeyPromise;
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const sig = await crypto.subtle.sign(
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{
name: 'HMAC'
},
authKey,
b64ToArray(this.nonce)
);
return `send-v1 ${arrayToB64(new Uint8Array(sig))}`;
}
async encryptMetadata(metadata) {
const metaKey = await this.metaKeyPromise;
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const ciphertext = await crypto.subtle.encrypt(
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{
name: 'AES-GCM',
iv: new Uint8Array(12),
tagLength: 128
},
metaKey,
encoder.encode(
JSON.stringify({
name: metadata.name,
size: metadata.size,
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type: metadata.type || 'application/octet-stream',
manifest: metadata.manifest || {}
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})
)
);
return ciphertext;
}
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encryptStream(plainStream) {
return encryptStream(plainStream, this.rawSecret);
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}
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decryptStream(cryptotext) {
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return decryptStream(cryptotext, this.rawSecret);
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}
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async decryptMetadata(ciphertext) {
const metaKey = await this.metaKeyPromise;
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const plaintext = await crypto.subtle.decrypt(
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{
name: 'AES-GCM',
iv: new Uint8Array(12),
tagLength: 128
},
metaKey,
ciphertext
);
return JSON.parse(decoder.decode(plaintext));
}
}