node_modules

1 files changed, 16 insertions, 0 deletions

diff --git a/node_modules/browserify-aes/modes/ofb.js b/node_modules/browserify-aes/modes/ofb.js
new file mode 100644
index 000000000..bd875589f
--- /dev/null
+++ b/node_modules/browserify-aes/modes/ofb.js
@@ -0,0 +1,16 @@
+var xor = require('buffer-xor')
+
+function getBlock (self) {
+  self._prev = self._cipher.encryptBlock(self._prev)
+  return self._prev
+}
+
+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)
+}