def set_key(self, key):
'''
Will set the crypting key for this object. Either 16 or 24 bytes long.
'''
self.key_size = 24 # Use DES-EDE3 mode
if len(key) != self.key_size:
if len(key) == 16: # Use DES-EDE2 mode
self.key_size = 16
else:
raise ValueError('Key must be either 16 or 24 bytes long.')
if self.get_mode() == CBC:
if not self.get_iv():
# Use the first 8 bytes of the key
self._iv = key[:self.block_size]
if len(self.get_iv()) != self.block_size:
raise ValueError('Invalid IV, must be 8 bytes in length')
self.__key1 = Des1(key[:8], self._mode, self._iv,
self._padding, self._padmode)
self.__key2 = Des1(key[8:16], self._mode, self._iv,
self._padding, self._padmode)
if self.key_size == 16:
self.__key3 = self.__key1
else:
self.__key3 = Des1(key[16:], self._mode, self._iv,
self._padding, self._padmode)
DesBase.set_key(self, key)
return
def set_key(self, key):
'''
Will set the crypting key for this object. Either 16 or 24 bytes long.
'''
self.key_size = 24 # Use DES-EDE3 mode
if len(key) != self.key_size:
if len(key) == 16: # Use DES-EDE2 mode
self.key_size = 16
else:
raise ValueError('Key must be either 16 or 24 bytes long.')
if self.get_mode() == CBC:
if not self.get_iv():
# Use the first 8 bytes of the key
self._iv = key[:self.block_size]
if len(self.get_iv()) != self.block_size:
raise ValueError('Invalid IV, must be 8 bytes in length')
self.__key1 = Des1(key[:8], self._mode, self._iv, self._padding,
self._padmode)
self.__key2 = Des1(key[8:16], self._mode, self._iv, self._padding,
self._padmode)
if self.key_size == 16:
self.__key3 = self.__key1
else:
self.__key3 = Des1(key[16:], self._mode, self._iv, self._padding,
self._padmode)
DesBase.set_key(self, key)
return
def set_key(self, key):
'''
Will set the crypting key for this object. Must be 8 bytes.
'''
DesBase.set_key(self, key)
self.__create_sub_keys()
return
def set_padding(self, pad):
'''
set_padding() -> bytes of length 1. Padding character.
'''
DesBase.set_padding(self, pad)
for key in (self.__key1, self.__key2, self.__key3):
key.set_padding(pad)
return
def set_mode(self, mode):
'''
Sets the type of crypting mode, pyDes.ECB or pyDes.CBC
'''
DesBase.set_mode(self, mode)
for key in (self.__key1, self.__key2, self.__key3):
key.set_mode(mode)
return
def set_iv(self, IV):
'''
Will set the Initial Value, used in conjunction with CBC mode
'''
DesBase.set_iv(self, IV)
for key in (self.__key1, self.__key2, self.__key3):
key.set_iv(IV)
return
def set_pad_mode(self, mode):
'''
Sets the type of padding mode, pyDes.PAD_NORMAL or pyDes.PAD_PKCS5
'''
DesBase.set_pad_mode(self, mode)
for key in (self.__key1, self.__key2, self.__key3):
key.set_pad_mode(mode)
return
def set_padding(self, pad):
'''
set_padding() -> bytes of length 1. Padding character.
'''
DesBase.set_padding(self, pad)
for key in (self.__key1, self.__key2, self.__key3):
key.set_padding(pad)
return
def set_mode(self, mode):
'''
Sets the type of crypting mode, pyDes.ECB or pyDes.CBC
'''
DesBase.set_mode(self, mode)
for key in (self.__key1, self.__key2, self.__key3):
key.set_mode(mode)
return
def set_iv(self, IV):
'''
Will set the Initial Value, used in conjunction with CBC mode
'''
DesBase.set_iv(self, IV)
for key in (self.__key1, self.__key2, self.__key3):
key.set_iv(IV)
return
def set_pad_mode(self, mode):
'''
Sets the type of padding mode, pyDes.PAD_NORMAL or pyDes.PAD_PKCS5
'''
DesBase.set_pad_mode(self, mode)
for key in (self.__key1, self.__key2, self.__key3):
key.set_pad_mode(mode)
return
def __init__(self, key, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
# Sanity checking of arguments.
if(len(key) != 8):
raise ValueError('Invalid DES key size.')
DesBase.__init__(self, mode, IV, pad, padmode)
self.key_size = 8
self.L = []
self.R = []
self.Kn = [[0] * 48] * 16 # 16 48-bit keys (K1 - K16)
self.final = []
self.set_key(key)
def __init__(self, key, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
DesBase.__init__(self, mode, IV, pad, padmode)
self.set_key(key)
def __init__(self, key, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
DesBase.__init__(self, mode, IV, pad, padmode)
self.set_key(key)
