From 015e2d2492519c96dda7a310d888b29984e9fead Mon Sep 17 00:00:00 2001
From: Guillaume Horel <guillaume.horel@gmail.com>
Date: Sat, 18 Feb 2012 19:07:39 -0500
Subject: Implementation of aes-ocb in python and javascript

We can know easily encrypt directories in python,
and generate objects in the alias format.
---
 crypto/ocb.js |  8 ++++++++
 crypto/ocb.py | 28 ++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 crypto/ocb.js
 create mode 100644 crypto/ocb.py

(limited to 'crypto')

diff --git a/crypto/ocb.js b/crypto/ocb.js
new file mode 100644
index 0000000..d7d53aa
--- /dev/null
+++ b/crypto/ocb.js
@@ -0,0 +1,8 @@
+load('sjcl.js')
+var aeskey = sjcl.codec.hex.toBits('12538243c49f1c58e6f7b0687bbd65b2')
+var iv = sjcl.codec.hex.toBits('250c3041c00a605a4100e264abbc588b')
+plaintext = "La chaire est triste, hélas ! et j'ai lu tous les livres."
+var secret = sjcl.encrypt(aeskey, plaintext,{mode:'ocb2', iv:iv, adata:"", tag:128})
+var secret2 = sjcl.json.decode(secret)
+print(secret)
+print(sjcl.codec.hex.fromBits(secret2.ct))
diff --git a/crypto/ocb.py b/crypto/ocb.py
new file mode 100644
index 0000000..08814c7
--- /dev/null
+++ b/crypto/ocb.py
@@ -0,0 +1,28 @@
+#-*- coding: utf-8 -*-
+from aespython import key_expander, aes_cipher, ocb_mode
+import json
+import base64
+def hex2byte(hexstring):
+    return map(ord, hexstring.decode("hex"))
+def byte2hex(byteslist):
+    return str(bytearray(byteslist)).encode("hex")
+
+if __name__=="__main__":
+    KE = key_expander.KeyExpander(128)
+    key = hex2byte('12538243c49f1c58e6f7b0687bbd65b2')
+    expanded_key = KE.expand(key)
+    aes_cipher_128 = aes_cipher.AESCipher(expanded_key)
+    aes_ocb_128 = ocb_mode.OCBMode(aes_cipher_128, 16)
+    iv = hex2byte('250c3041c00a605a4100e264abbc588b')
+    aes_ocb_128.set_iv(iv)
+    plaintext = "La chaire est triste, hélas ! et j'ai lu tous les livres.".encode("hex")
+    header = "".encode("hex")
+    (tag,ciphertext) = aes_ocb_128.encrypt_block(hex2byte(plaintext), hex2byte(header))
+    sjcl_object = {"iv": base64.b64encode(bytearray(iv)).rstrip("="),
+                 "mode": "ocb2",
+                 "tag": 128,
+                 "ct": base64.b64encode(bytearray(ciphertext) +
+                                        bytearray(tag)).rstrip("=")
+                 }
+    print json.dumps(sjcl_object)
+
-- 
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