1 files changed, 141 insertions, 0 deletions
diff --git a/node_modules/des.js/lib/des/cipher.js b/node_modules/des.js/lib/des/cipher.js
new file mode 100644
index 000000000..d0090b4cd
--- /dev/null
+++ b/node_modules/des.js/lib/des/cipher.js
@@ -0,0 +1,141 @@
+'use strict';
+
+var assert = require('minimalistic-assert');
+
+function Cipher(options) {
+  this.options = options;
+
+  this.type = this.options.type;
+  this.blockSize = 8;
+  this._init();
+
+  this.buffer = new Array(this.blockSize);
+  this.bufferOff = 0;
+}
+module.exports = Cipher;
+
+Cipher.prototype._init = function _init() {
+  // Might be overrided
+};
+
+Cipher.prototype.update = function update(data) {
+  if (data.length === 0)
+    return [];
+
+  if (this.type === 'decrypt')
+    return this._updateDecrypt(data);
+  else
+    return this._updateEncrypt(data);
+};
+
+Cipher.prototype._buffer = function _buffer(data, off) {
+  // Append data to buffer
+  var min = Math.min(this.buffer.length - this.bufferOff, data.length - off);
+  for (var i = 0; i < min; i++)
+    this.buffer[this.bufferOff + i] = data[off + i];
+  this.bufferOff += min;
+
+  // Shift next
+  return min;
+};
+
+Cipher.prototype._flushBuffer = function _flushBuffer(out, off) {
+  this._update(this.buffer, 0, out, off);
+  this.bufferOff = 0;
+  return this.blockSize;
+};
+
+Cipher.prototype._updateEncrypt = function _updateEncrypt(data) {
+  var inputOff = 0;
+  var outputOff = 0;
+
+  var count = ((this.bufferOff + data.length) / this.blockSize) | 0;
+  var out = new Array(count * this.blockSize);
+
+  if (this.bufferOff !== 0) {
+    inputOff += this._buffer(data, inputOff);
+
+    if (this.bufferOff === this.buffer.length)
+      outputOff += this._flushBuffer(out, outputOff);
+  }
+
+  // Write blocks
+  var max = data.length - ((data.length - inputOff) % this.blockSize);
+  for (; inputOff < max; inputOff += this.blockSize) {
+    this._update(data, inputOff, out, outputOff);
+    outputOff += this.blockSize;
+  }
+
+  // Queue rest
+  for (; inputOff < data.length; inputOff++, this.bufferOff++)
+    this.buffer[this.bufferOff] = data[inputOff];
+
+  return out;
+};
+
+Cipher.prototype._updateDecrypt = function _updateDecrypt(data) {
+  var inputOff = 0;
+  var outputOff = 0;
+
+  var count = Math.ceil((this.bufferOff + data.length) / this.blockSize) - 1;
+  var out = new Array(count * this.blockSize);
+
+  // TODO(indutny): optimize it, this is far from optimal
+  for (; count > 0; count--) {
+    inputOff += this._buffer(data, inputOff);
+    outputOff += this._flushBuffer(out, outputOff);
+  }
+
+  // Buffer rest of the input
+  inputOff += this._buffer(data, inputOff);
+
+  return out;
+};
+
+Cipher.prototype.final = function final(buffer) {
+  var first;
+  if (buffer)
+    first = this.update(buffer);
+
+  var last;
+  if (this.type === 'encrypt')
+    last = this._finalEncrypt();
+  else
+    last = this._finalDecrypt();
+
+  if (first)
+    return first.concat(last);
+  else
+    return last;
+};
+
+Cipher.prototype._pad = function _pad(buffer, off) {
+  if (off === 0)
+    return false;
+
+  while (off < buffer.length)
+    buffer[off++] = 0;
+
+  return true;
+};
+
+Cipher.prototype._finalEncrypt = function _finalEncrypt() {
+  if (!this._pad(this.buffer, this.bufferOff))
+    return [];
+
+  var out = new Array(this.blockSize);
+  this._update(this.buffer, 0, out, 0);
+  return out;
+};
+
+Cipher.prototype._unpad = function _unpad(buffer) {
+  return buffer;
+};
+
+Cipher.prototype._finalDecrypt = function _finalDecrypt() {
+  assert.equal(this.bufferOff, this.blockSize, 'Not enough data to decrypt');
+  var out = new Array(this.blockSize);
+  this._flushBuffer(out, 0);
+
+  return this._unpad(out);
+};