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.
66 lines
1.4 KiB
66 lines
1.4 KiB
'use strict';
|
|
|
|
var assert = require('minimalistic-assert');
|
|
var inherits = require('inherits');
|
|
|
|
var proto = {};
|
|
|
|
function CBCState(iv) {
|
|
assert.equal(iv.length, 8, 'Invalid IV length');
|
|
|
|
this.iv = new Array(8);
|
|
for (var i = 0; i < this.iv.length; i++)
|
|
this.iv[i] = iv[i];
|
|
}
|
|
|
|
function instantiate(Base) {
|
|
function CBC(options) {
|
|
Base.call(this, options);
|
|
this._cbcInit();
|
|
}
|
|
inherits(CBC, Base);
|
|
|
|
var keys = Object.keys(proto);
|
|
for (var i = 0; i < keys.length; i++) {
|
|
var key = keys[i];
|
|
CBC.prototype[key] = proto[key];
|
|
}
|
|
|
|
CBC.create = function create(options) {
|
|
return new CBC(options);
|
|
};
|
|
|
|
return CBC;
|
|
}
|
|
|
|
exports.instantiate = instantiate;
|
|
|
|
proto._cbcInit = function _cbcInit() {
|
|
var state = new CBCState(this.options.iv);
|
|
this._cbcState = state;
|
|
};
|
|
|
|
proto._update = function _update(inp, inOff, out, outOff) {
|
|
var state = this._cbcState;
|
|
var superProto = this.constructor.super_.prototype;
|
|
|
|
var iv = state.iv;
|
|
if (this.type === 'encrypt') {
|
|
for (var i = 0; i < this.blockSize; i++)
|
|
iv[i] ^= inp[inOff + i];
|
|
|
|
superProto._update.call(this, iv, 0, out, outOff);
|
|
|
|
for (var i = 0; i < this.blockSize; i++)
|
|
iv[i] = out[outOff + i];
|
|
} else {
|
|
superProto._update.call(this, inp, inOff, out, outOff);
|
|
|
|
for (var i = 0; i < this.blockSize; i++)
|
|
out[outOff + i] ^= iv[i];
|
|
|
|
for (var i = 0; i < this.blockSize; i++)
|
|
iv[i] = inp[inOff + i];
|
|
}
|
|
};
|