You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
1.3 KiB
54 lines
1.3 KiB
'use strict';
|
|
|
|
var assert = require('minimalistic-assert');
|
|
var inherits = require('inherits');
|
|
|
|
var Cipher = require('./cipher');
|
|
var DES = require('./des');
|
|
|
|
function EDEState(type, key) {
|
|
assert.equal(key.length, 24, 'Invalid key length');
|
|
|
|
var k1 = key.slice(0, 8);
|
|
var k2 = key.slice(8, 16);
|
|
var k3 = key.slice(16, 24);
|
|
|
|
if (type === 'encrypt') {
|
|
this.ciphers = [
|
|
DES.create({ type: 'encrypt', key: k1 }),
|
|
DES.create({ type: 'decrypt', key: k2 }),
|
|
DES.create({ type: 'encrypt', key: k3 })
|
|
];
|
|
} else {
|
|
this.ciphers = [
|
|
DES.create({ type: 'decrypt', key: k3 }),
|
|
DES.create({ type: 'encrypt', key: k2 }),
|
|
DES.create({ type: 'decrypt', key: k1 })
|
|
];
|
|
}
|
|
}
|
|
|
|
function EDE(options) {
|
|
Cipher.call(this, options);
|
|
|
|
var state = new EDEState(this.type, this.options.key);
|
|
this._edeState = state;
|
|
}
|
|
inherits(EDE, Cipher);
|
|
|
|
module.exports = EDE;
|
|
|
|
EDE.create = function create(options) {
|
|
return new EDE(options);
|
|
};
|
|
|
|
EDE.prototype._update = function _update(inp, inOff, out, outOff) {
|
|
var state = this._edeState;
|
|
|
|
state.ciphers[0]._update(inp, inOff, out, outOff);
|
|
state.ciphers[1]._update(out, outOff, out, outOff);
|
|
state.ciphers[2]._update(out, outOff, out, outOff);
|
|
};
|
|
|
|
EDE.prototype._pad = DES.prototype._pad;
|
|
EDE.prototype._unpad = DES.prototype._unpad;
|
|
|