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"""Factory functions for symmetric cryptography."""
import os
import Python_AES
import Python_RC4
import cryptomath
tripleDESPresent = False
if cryptomath.m2cryptoLoaded:
import OpenSSL_AES
import OpenSSL_RC4
import OpenSSL_TripleDES
tripleDESPresent = True
if cryptomath.cryptlibpyLoaded:
import Cryptlib_AES
import Cryptlib_RC4
import Cryptlib_TripleDES
tripleDESPresent = True
if cryptomath.pycryptoLoaded:
import PyCrypto_AES
import PyCrypto_RC4
import PyCrypto_TripleDES
tripleDESPresent = True
# **************************************************************************
# Factory Functions for AES
# **************************************************************************
def createAES(key, IV, implList=None):
"""Create a new AES object.
@type key: str
@param key: A 16, 24, or 32 byte string.
@type IV: str
@param IV: A 16 byte string
@rtype: L{tlslite.utils.AES}
@return: An AES object.
"""
if implList == None:
implList = ["cryptlib", "openssl", "pycrypto", "python"]
for impl in implList:
if impl == "cryptlib" and cryptomath.cryptlibpyLoaded:
return Cryptlib_AES.new(key, 2, IV)
elif impl == "openssl" and cryptomath.m2cryptoLoaded:
return OpenSSL_AES.new(key, 2, IV)
elif impl == "pycrypto" and cryptomath.pycryptoLoaded:
return PyCrypto_AES.new(key, 2, IV)
elif impl == "python":
return Python_AES.new(key, 2, IV)
raise NotImplementedError()
def createRC4(key, IV, implList=None):
"""Create a new RC4 object.
@type key: str
@param key: A 16 to 32 byte string.
@type IV: object
@param IV: Ignored, whatever it is.
@rtype: L{tlslite.utils.RC4}
@return: An RC4 object.
"""
if implList == None:
implList = ["cryptlib", "openssl", "pycrypto", "python"]
if len(IV) != 0:
raise AssertionError()
for impl in implList:
if impl == "cryptlib" and cryptomath.cryptlibpyLoaded:
return Cryptlib_RC4.new(key)
elif impl == "openssl" and cryptomath.m2cryptoLoaded:
return OpenSSL_RC4.new(key)
elif impl == "pycrypto" and cryptomath.pycryptoLoaded:
return PyCrypto_RC4.new(key)
elif impl == "python":
return Python_RC4.new(key)
raise NotImplementedError()
#Create a new TripleDES instance
def createTripleDES(key, IV, implList=None):
"""Create a new 3DES object.
@type key: str
@param key: A 24 byte string.
@type IV: str
@param IV: An 8 byte string
@rtype: L{tlslite.utils.TripleDES}
@return: A 3DES object.
"""
if implList == None:
implList = ["cryptlib", "openssl", "pycrypto"]
for impl in implList:
if impl == "cryptlib" and cryptomath.cryptlibpyLoaded:
return Cryptlib_TripleDES.new(key, 2, IV)
elif impl == "openssl" and cryptomath.m2cryptoLoaded:
return OpenSSL_TripleDES.new(key, 2, IV)
elif impl == "pycrypto" and cryptomath.pycryptoLoaded:
return PyCrypto_TripleDES.new(key, 2, IV)
raise NotImplementedError()
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