/gdata/tlslite/utils/Cryptlib_TripleDES.py
Python | 35 lines | 25 code | 9 blank | 1 comment | 1 complexity | 1555865aa5eaf7f952ccb0846e2a6583 MD5 | raw file
1"""Cryptlib 3DES implementation.""" 2 3from cryptomath import * 4 5from TripleDES import * 6 7if cryptlibpyLoaded: 8 9 def new(key, mode, IV): 10 return Cryptlib_TripleDES(key, mode, IV) 11 12 class Cryptlib_TripleDES(TripleDES): 13 14 def __init__(self, key, mode, IV): 15 TripleDES.__init__(self, key, mode, IV, "cryptlib") 16 self.context = cryptlib_py.cryptCreateContext(cryptlib_py.CRYPT_UNUSED, cryptlib_py.CRYPT_ALGO_3DES) 17 cryptlib_py.cryptSetAttribute(self.context, cryptlib_py.CRYPT_CTXINFO_MODE, cryptlib_py.CRYPT_MODE_CBC) 18 cryptlib_py.cryptSetAttribute(self.context, cryptlib_py.CRYPT_CTXINFO_KEYSIZE, len(key)) 19 cryptlib_py.cryptSetAttributeString(self.context, cryptlib_py.CRYPT_CTXINFO_KEY, key) 20 cryptlib_py.cryptSetAttributeString(self.context, cryptlib_py.CRYPT_CTXINFO_IV, IV) 21 22 def __del__(self): 23 cryptlib_py.cryptDestroyContext(self.context) 24 25 def encrypt(self, plaintext): 26 TripleDES.encrypt(self, plaintext) 27 bytes = stringToBytes(plaintext) 28 cryptlib_py.cryptEncrypt(self.context, bytes) 29 return bytesToString(bytes) 30 31 def decrypt(self, ciphertext): 32 TripleDES.decrypt(self, ciphertext) 33 bytes = stringToBytes(ciphertext) 34 cryptlib_py.cryptDecrypt(self.context, bytes) 35 return bytesToString(bytes)