Move lib to lib/Python/Lib

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/Python/Lib/beaker/crypto/jcecrypto.py b/lib/Python/Lib/beaker/crypto/jcecrypto.py
new file mode 100644
index 000000000..4062d513e
--- /dev/null
+++ b/lib/Python/Lib/beaker/crypto/jcecrypto.py
@@ -0,0 +1,30 @@
+"""
+Encryption module that uses the Java Cryptography Extensions (JCE).
+
+Note that in default installations of the Java Runtime Environment, the
+maximum key length is limited to 128 bits due to US export
+restrictions. This makes the generated keys incompatible with the ones
+generated by pycryptopp, which has no such restrictions. To fix this,
+download the "Unlimited Strength Jurisdiction Policy Files" from Sun,
+which will allow encryption using 256 bit AES keys.
+"""
+from javax.crypto import Cipher
+from javax.crypto.spec import SecretKeySpec, IvParameterSpec
+
+import jarray
+
+# Initialization vector filled with zeros
+_iv = IvParameterSpec(jarray.zeros(16, 'b'))
+
+def aesEncrypt(data, key):
+    cipher = Cipher.getInstance('AES/CTR/NoPadding')
+    skeySpec = SecretKeySpec(key, 'AES')
+    cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv)
+    return cipher.doFinal(data).tostring()
+
+# magic.
+aesDecrypt = aesEncrypt
+
+def getKeyLength():
+    maxlen = Cipher.getMaxAllowedKeyLength('AES/CTR/NoPadding')
+    return min(maxlen, 256) / 8