Current File : //opt/alt/python37/lib/python3.7/site-packages/beaker/crypto/__init__.py
from .._compat import JYTHON
from beaker.crypto.pbkdf2 import pbkdf2
from beaker.crypto.util import hmac, sha1, hmac_sha1, md5
from beaker import util
from beaker.exceptions import InvalidCryptoBackendError
keyLength = None
DEFAULT_NONCE_BITS = 128
CRYPTO_MODULES = {}
def load_default_module():
""" Load the default crypto module
"""
if JYTHON:
try:
from beaker.crypto import jcecrypto
return jcecrypto
except ImportError:
pass
else:
try:
from beaker.crypto import nsscrypto
return nsscrypto
except ImportError:
try:
from beaker.crypto import pycrypto
return pycrypto
except ImportError:
pass
from beaker.crypto import noencryption
return noencryption
def register_crypto_module(name, mod):
"""
Register the given module under the name given.
"""
CRYPTO_MODULES[name] = mod
def get_crypto_module(name):
"""
Get the active crypto module for this name
"""
if name not in CRYPTO_MODULES:
if name == 'default':
register_crypto_module('default', load_default_module())
elif name == 'nss':
from beaker.crypto import nsscrypto
register_crypto_module(name, nsscrypto)
elif name == 'pycrypto':
from beaker.crypto import pycrypto
register_crypto_module(name, pycrypto)
elif name == 'cryptography':
from beaker.crypto import pyca_cryptography
register_crypto_module(name, pyca_cryptography)
else:
raise InvalidCryptoBackendError(
"No crypto backend with name '%s' is registered." % name)
return CRYPTO_MODULES[name]
def generateCryptoKeys(master_key, salt, iterations, keylen):
# NB: We XOR parts of the keystream into the randomly-generated parts, just
# in case os.urandom() isn't as random as it should be. Note that if
# os.urandom() returns truly random data, this will have no effect on the
# overall security.
return pbkdf2(master_key, salt, iterations=iterations, dklen=keylen)
def get_nonce_size(number_of_bits):
if number_of_bits % 8:
raise ValueError('Nonce complexity currently supports multiples of 8')
bytes = number_of_bits // 8
b64bytes = ((4 * bytes // 3) + 3) & ~3
return bytes, b64bytes
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