From de98e0b232509d5f40c135d540a70e415272ff85 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 3 May 2017 15:35:00 +0200
Subject: node_modules

---
 node_modules/browserify-aes/modes/ctr.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 node_modules/browserify-aes/modes/ctr.js

(limited to 'node_modules/browserify-aes/modes/ctr.js')

diff --git a/node_modules/browserify-aes/modes/ctr.js b/node_modules/browserify-aes/modes/ctr.js
new file mode 100644
index 000000000..0ef2278bf
--- /dev/null
+++ b/node_modules/browserify-aes/modes/ctr.js
@@ -0,0 +1,31 @@
+var xor = require('buffer-xor')
+
+function incr32 (iv) {
+  var len = iv.length
+  var item
+  while (len--) {
+    item = iv.readUInt8(len)
+    if (item === 255) {
+      iv.writeUInt8(0, len)
+    } else {
+      item++
+      iv.writeUInt8(item, len)
+      break
+    }
+  }
+}
+
+function getBlock (self) {
+  var out = self._cipher.encryptBlock(self._prev)
+  incr32(self._prev)
+  return out
+}
+
+exports.encrypt = function (self, chunk) {
+  while (self._cache.length < chunk.length) {
+    self._cache = Buffer.concat([self._cache, getBlock(self)])
+  }
+  var pad = self._cache.slice(0, chunk.length)
+  self._cache = self._cache.slice(chunk.length)
+  return xor(chunk, pad)
+}
-- 
cgit v1.2.3