node-aescrypt
Version:
A node implementation of the AES Crypt <https://www.aescrypt.com/> file encryption format.
207 lines • 16.4 kB
JavaScript
import { createDecipheriv } from 'crypto';
import { Transform } from 'stream';
import { AESCRYPT_FILE_FORMAT_VERSION, getHMAC, getKey, toStream, withStream, } from './util';
/**
* Decrypt a Buffer that is in the AES Crypt file format.
*
* Create a stream transformer that takes [Readable stream](https://nodejs.org/api/stream.html)
* that is encrypted in the
* [AES Crypt file format](https://www.aescrypt.com/aes_file_format.html) and
* decrypts it passing it on as a Readable stream.
*/
export class Decrypt extends Transform {
constructor(password, options) {
super(options);
this.password = password;
this.decipher = null;
this.hmac = null;
this.mode = 0;
this.buffer = Buffer.alloc(0);
}
static get MODE_FILE_HEADER() {
return 0;
}
static get MODE_EXTESIONS() {
return 1;
}
static get MODE_CREDENTIALS() {
return 2;
}
static get MODE_DECRYPT() {
return 3;
}
// Create a small helper static method if you just want to decrypt a whole
// Buffer all at once.
static buffer(password, buffer) {
return new Promise((resolve, reject) => {
toStream(buffer)
.pipe(new Decrypt(password))
.pipe(withStream(contents => {
resolve(contents);
}))
.on('error', reject);
});
}
_transform(chunk, _, callback) {
this.buffer = Buffer.concat([this.buffer, chunk]);
let error = null;
// Move through the various sections of the file format and raise an error
// If anything is malformed.
if (this.mode === Decrypt.MODE_FILE_HEADER) {
error = this._modeFileHeader();
}
if (!error && this.mode === Decrypt.MODE_EXTESIONS) {
error = this._modeExtensions();
}
if (!error && this.mode === Decrypt.MODE_CREDENTIALS) {
error = this._modeCredentials();
}
// Finally ready to decrypt the contents.
if (!error && this.mode === Decrypt.MODE_DECRYPT) {
// We need to reserve 33 bytes (+ 16 for the padding) of the end for the file-size-modulo-16 and HMAC.
if (this.buffer.length > 49) {
const encChunk = this.buffer.slice(0, -49);
// This is unnecessary, but makes tslint keep quiet.
if (this.decipher == null) {
return;
}
if (this.hmac == null) {
return;
}
this.hmac.update(encChunk);
this.push(this.decipher.update(encChunk));
this.buffer = this.buffer.slice(-49);
}
}
if (error) {
callback(error);
}
else {
callback();
}
}
_flush(callback) {
let error = null;
// If we never got to the decryption mode, something went terribly wrong.
// Most likely, there is a problem in the extensions, and we never found
// the end.
if (this.mode !== Decrypt.MODE_DECRYPT) {
error = new Error('Error: Message has been altered or password is incorrect');
}
else {
// We are at the end of the file. Let's hash that last remaining cipher text
// and check the HMAC.
const encChunk = this.buffer.slice(0, 16);
const lenMod16 = this.buffer.readUInt8(16);
const encHMACActual = this.buffer.slice(17);
// This is unnecessary, but makes tslint keep quiet.
if (this.decipher == null) {
return;
}
if (this.hmac == null) {
return;
}
this.hmac.update(encChunk);
const encHMACExpected = this.hmac.digest();
// Validately the integrity of the cipher text.
if (encHMACExpected.compare(encHMACActual) !== 0) {
error = new Error('Error: Message has been altered or password is incorrect');
}
// Validate the padding length (or more accurately, the length of the last block minus the padding).
else if (lenMod16 > 16) {
error = new Error('Error: Message has been altered or password is incorrect');
}
else {
// Decrypt the last block and send it on its way.
const decChunk = Buffer.concat([
this.decipher.update(encChunk),
this.decipher.final(),
]).slice(0, lenMod16);
this.push(decChunk);
}
}
if (error) {
callback(error);
}
else {
callback();
}
}
_modeFileHeader() {
if (this.buffer.length >= 5) {
const type = this.buffer.slice(0, 3).toString();
const version = this.buffer.readUInt8(3);
if (type !== 'AES') {
return new Error('Error: Bad file header (not aescrypt file or is corrupted?');
}
// We only understand the version 2 of the AES Crypt file format as described
// at https://www.aescrypt.com/aes_file_format.html.
if (version !== AESCRYPT_FILE_FORMAT_VERSION) {
return new Error('Error: Unsupported AES file version');
}
this.buffer = this.buffer.slice(5);
this.mode = Decrypt.MODE_EXTESIONS;
}
return null;
}
_modeExtensions() {
let i = 0;
// Search through the buffer to the length.
// If we can't find the end of the extensions in the current buffer, let it
// buffer a little more.
while (i + 1 < this.buffer.length) {
const extLen = this.buffer.readUInt16BE(i);
i += 2;
// If this extension has a length, fast-forward past it.
if (extLen > 0) {
i += extLen;
}
// If this is a zero length extension, we are done.
else {
this.buffer = this.buffer.slice(i);
this.mode = Decrypt.MODE_CREDENTIALS;
break;
}
}
return null;
}
_modeCredentials() {
if (this.buffer.length >= 96) {
const credIV = this.buffer.slice(0, 16);
const credKey = getKey(credIV, this.password);
const credDecipher = this._getDecipher(credKey, credIV);
credDecipher.setAutoPadding(false);
const credBlock = this.buffer.slice(16, 64);
const credHMACActual = this.buffer.slice(64, 96);
const credHMACExpected = getHMAC(credKey)
.update(credBlock)
.digest();
// First we check the HMAC signature of the encrypted credentials block.
// This ensures nothing was tampered with. It also has the added benefit
// of checking the password early on in the decryption process.
if (credHMACExpected.compare(credHMACActual) !== 0) {
return new Error('Error: Message has been altered or password is incorrect');
}
// Decrypt the credentials we need for the rest of the contents.
const decryptedCredBlock = Buffer.concat([
credDecipher.update(credBlock),
credDecipher.final(),
]);
const encIV = decryptedCredBlock.slice(0, 16);
const encKey = decryptedCredBlock.slice(16, 48);
// Create our main workhorses using the decrypted credentials.
this.decipher = this._getDecipher(encKey, encIV);
this.hmac = getHMAC(encKey);
delete this.password; // Don't need this anymore.
this.buffer = this.buffer.slice(96);
this.mode = Decrypt.MODE_DECRYPT;
}
return null;
}
_getDecipher(key, iv) {
const encDecipher = createDecipheriv('aes-256-cbc', key, iv);
encDecipher.setAutoPadding(false);
return encDecipher;
}
}
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