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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/browserify-aes/modes/cfb.js
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Diffstat (limited to 'node_modules/browserify-aes/modes/cfb.js')
-rw-r--r--node_modules/browserify-aes/modes/cfb.js33
1 files changed, 33 insertions, 0 deletions
diff --git a/node_modules/browserify-aes/modes/cfb.js b/node_modules/browserify-aes/modes/cfb.js
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+++ b/node_modules/browserify-aes/modes/cfb.js
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+var Buffer = require('safe-buffer').Buffer
+var xor = require('buffer-xor')
+
+function encryptStart (self, data, decrypt) {
+ var len = data.length
+ var out = xor(data, self._cache)
+ self._cache = self._cache.slice(len)
+ self._prev = Buffer.concat([self._prev, decrypt ? data : out])
+ return out
+}
+
+exports.encrypt = function (self, data, decrypt) {
+ var out = Buffer.allocUnsafe(0)
+ var len
+
+ while (data.length) {
+ if (self._cache.length === 0) {
+ self._cache = self._cipher.encryptBlock(self._prev)
+ self._prev = Buffer.allocUnsafe(0)
+ }
+
+ if (self._cache.length <= data.length) {
+ len = self._cache.length
+ out = Buffer.concat([out, encryptStart(self, data.slice(0, len), decrypt)])
+ data = data.slice(len)
+ } else {
+ out = Buffer.concat([out, encryptStart(self, data, decrypt)])
+ break
+ }
+ }
+
+ return out
+}