hacks/dump-imessages/iphone-dataprotection/python_scripts/keychain/keychain3.py

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from keychain import Keychain
from crypto.aes import AESdecryptCBC, AESencryptCBC
import hashlib
class Keychain3(Keychain):
def __init__(self, filename, key835=None):
Keychain.__init__(self, filename)
self.key835 = key835
def decrypt_data(self, data):
if data == None:
return ""
data = str(data)
if not self.key835:
print "Key 835 not availaible"
return ""
data = AESdecryptCBC(data[16:], self.key835, data[:16], padding=True)
#data_column = iv + AES128_K835(iv, data + sha1(data))
if hashlib.sha1(data[:-20]).digest() != data[-20:]:
print "data field hash mismatch : bad key ?"
return "ERROR decrypting data : bad key ?"
return data[:-20]
def change_key835(self, newkey):
tables = {"genp": "SELECT rowid, data FROM genp",
"inet": "SELECT rowid, data FROM inet",
"cert": "SELECT rowid, data FROM cert",
"keys": "SELECT rowid, data FROM keys"}
for t in tables.keys():
for row in self.conn.execute(tables[t]):
rowid = row["rowid"]
data = str(row["data"])
iv = data[:16]
data = AESdecryptCBC(data[16:], self.key835, iv)
data = AESencryptCBC(data, newkey, iv)
data = iv + data
data = buffer(data)
self.conn.execute("UPDATE %s SET data=? WHERE rowid=?" % t, (data, rowid))
self.conn.commit()