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#!/usr/bin/python -Ott
import os
import base64
from M2Crypto import Rand
from M2Crypto.EVP import Cipher, EVPError
from Bcfg2.Compat import StringIO
try:
from hashlib import md5
except ImportError:
from md5 import md5
ENCRYPT = 1
DECRYPT = 0
ALGORITHM = "aes_256_cbc"
IV = '\0' * 16
Rand.rand_seed(os.urandom(1024))
def _cipher_filter(cipher, instr):
inbuf = StringIO(instr)
outbuf = StringIO()
while 1:
buf = inbuf.read()
if not buf:
break
outbuf.write(cipher.update(buf))
outbuf.write(cipher.final())
rv = outbuf.getvalue()
inbuf.close()
outbuf.close()
return rv
def str_encrypt(plaintext, key, iv=IV, algorithm=ALGORITHM, salt=None):
""" encrypt a string """
cipher = Cipher(alg=algorithm, key=key, iv=iv, op=ENCRYPT, salt=salt)
return _cipher_filter(cipher, plaintext)
def str_decrypt(crypted, key, iv=IV, algorithm=ALGORITHM):
""" decrypt a string """
cipher = Cipher(alg=algorithm, key=key, iv=iv, op=DECRYPT)
return _cipher_filter(cipher, crypted)
def ssl_decrypt(data, passwd, algorithm=ALGORITHM):
""" decrypt openssl-encrypted data """
# base64-decode the data if necessary
try:
data = base64.b64decode(data)
except TypeError:
# already decoded
pass
salt = data[8:16]
hashes = [md5(passwd + salt).digest()]
for i in range(1,3):
hashes.append(md5(hashes[i-1] + passwd + salt).digest())
key = hashes[0] + hashes[1]
iv = hashes[2]
return str_decrypt(data[16:], key=key, iv=iv)
def ssl_encrypt(plaintext, passwd, algorithm=ALGORITHM, salt=None):
""" encrypt data in a format that is openssl compatible """
if salt is None:
salt = Rand.rand_bytes(8)
hashes = [md5(passwd + salt).digest()]
for i in range(1,3):
hashes.append(md5(hashes[i-1] + passwd + salt).digest())
key = hashes[0] + hashes[1]
iv = hashes[2]
crypted = str_encrypt(plaintext, key=key, salt=salt, iv=iv)
return base64.b64encode("Salted__" + salt + crypted) + "\n"
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