/usr/lib/python2.7/dist-packages/cryptography/hazmat/primitives/asymmetric/dsa.py is in python-cryptography 0.6.1-1+deb8u1.
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# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import warnings
import six
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.backends.interfaces import DSABackend
from cryptography.hazmat.primitives import interfaces
def generate_parameters(key_size, backend):
return backend.generate_dsa_parameters(key_size)
def generate_private_key(key_size, backend):
return backend.generate_dsa_private_key_and_parameters(key_size)
def _check_dsa_parameters(parameters):
if (utils.bit_length(parameters.p),
utils.bit_length(parameters.q)) not in (
(1024, 160),
(2048, 256),
(3072, 256)):
raise ValueError("p and q lengths must be "
"one of these pairs (1024, 160) or (2048, 256) "
"or (3072, 256).")
if not (1 < parameters.g < parameters.p):
raise ValueError("g, p don't satisfy 1 < g < p.")
def _check_dsa_private_numbers(numbers):
parameters = numbers.public_numbers.parameter_numbers
_check_dsa_parameters(parameters)
if numbers.x <= 0 or numbers.x >= parameters.q:
raise ValueError("x must be > 0 and < q.")
if numbers.public_numbers.y != pow(parameters.g, numbers.x, parameters.p):
raise ValueError("y must be equal to (g ** x % p).")
@utils.register_interface(interfaces.DSAParameters)
class DSAParameters(object):
def __init__(self, modulus, subgroup_order, generator):
warnings.warn(
"The DSAParameters class is deprecated and will be removed in a "
"future version.",
utils.DeprecatedIn05,
stacklevel=2
)
_check_dsa_parameters(
DSAParameterNumbers(
p=modulus,
q=subgroup_order,
g=generator
)
)
self._modulus = modulus
self._subgroup_order = subgroup_order
self._generator = generator
@classmethod
def generate(cls, key_size, backend):
warnings.warn(
"generate is deprecated and will be removed in a future version.",
utils.DeprecatedIn05,
stacklevel=2
)
if not isinstance(backend, DSABackend):
raise UnsupportedAlgorithm(
"Backend object does not implement DSABackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
parameters = backend.generate_dsa_parameters(key_size)
numbers = parameters.parameter_numbers()
return cls(
modulus=numbers.p,
subgroup_order=numbers.q,
generator=numbers.g
)
@property
def modulus(self):
return self._modulus
@property
def subgroup_order(self):
return self._subgroup_order
@property
def generator(self):
return self._generator
@property
def p(self):
return self.modulus
@property
def q(self):
return self.subgroup_order
@property
def g(self):
return self.generator
@utils.register_interface(interfaces.DSAPrivateKey)
class DSAPrivateKey(object):
def __init__(self, modulus, subgroup_order, generator, x, y):
warnings.warn(
"The DSAPrivateKey class is deprecated and will be removed in a "
"future version.",
utils.DeprecatedIn05,
stacklevel=2
)
if (
not isinstance(x, six.integer_types) or
not isinstance(y, six.integer_types)
):
raise TypeError("DSAPrivateKey arguments must be integers.")
_check_dsa_private_numbers(
DSAPrivateNumbers(
public_numbers=DSAPublicNumbers(
parameter_numbers=DSAParameterNumbers(
p=modulus,
q=subgroup_order,
g=generator
),
y=y
),
x=x
)
)
self._modulus = modulus
self._subgroup_order = subgroup_order
self._generator = generator
self._x = x
self._y = y
@classmethod
def generate(cls, parameters, backend):
warnings.warn(
"generate is deprecated and will be removed in a future version.",
utils.DeprecatedIn05,
stacklevel=2
)
if not isinstance(backend, DSABackend):
raise UnsupportedAlgorithm(
"Backend object does not implement DSABackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
key = backend.generate_dsa_private_key(parameters)
private_numbers = key.private_numbers()
return cls(
modulus=private_numbers.public_numbers.parameter_numbers.p,
subgroup_order=private_numbers.public_numbers.parameter_numbers.q,
generator=private_numbers.public_numbers.parameter_numbers.g,
x=private_numbers.x,
y=private_numbers.public_numbers.y
)
def signer(self, algorithm, backend):
if not isinstance(backend, DSABackend):
raise UnsupportedAlgorithm(
"Backend object does not implement DSABackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
return backend.create_dsa_signature_ctx(self, algorithm)
@property
def key_size(self):
return utils.bit_length(self._modulus)
def public_key(self):
return DSAPublicKey(self._modulus, self._subgroup_order,
self._generator, self.y)
@property
def x(self):
return self._x
@property
def y(self):
return self._y
def parameters(self):
return DSAParameters(self._modulus, self._subgroup_order,
self._generator)
@utils.register_interface(interfaces.DSAPublicKey)
class DSAPublicKey(object):
def __init__(self, modulus, subgroup_order, generator, y):
warnings.warn(
"The DSAPublicKey class is deprecated and will be removed in a "
"future version.",
utils.DeprecatedIn05,
stacklevel=2
)
_check_dsa_parameters(
DSAParameterNumbers(
p=modulus,
q=subgroup_order,
g=generator
)
)
if not isinstance(y, six.integer_types):
raise TypeError("y must be an integer.")
self._modulus = modulus
self._subgroup_order = subgroup_order
self._generator = generator
self._y = y
def verifier(self, signature, algorithm, backend):
if not isinstance(backend, DSABackend):
raise UnsupportedAlgorithm(
"Backend object does not implement DSABackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
return backend.create_dsa_verification_ctx(self, signature,
algorithm)
@property
def key_size(self):
return utils.bit_length(self._modulus)
@property
def y(self):
return self._y
def parameters(self):
return DSAParameters(self._modulus, self._subgroup_order,
self._generator)
class DSAParameterNumbers(object):
def __init__(self, p, q, g):
if (
not isinstance(p, six.integer_types) or
not isinstance(q, six.integer_types) or
not isinstance(g, six.integer_types)
):
raise TypeError(
"DSAParameterNumbers p, q, and g arguments must be integers."
)
self._p = p
self._q = q
self._g = g
@property
def p(self):
return self._p
@property
def q(self):
return self._q
@property
def g(self):
return self._g
def parameters(self, backend):
return backend.load_dsa_parameter_numbers(self)
class DSAPublicNumbers(object):
def __init__(self, y, parameter_numbers):
if not isinstance(y, six.integer_types):
raise TypeError("DSAPublicNumbers y argument must be an integer.")
if not isinstance(parameter_numbers, DSAParameterNumbers):
raise TypeError(
"parameter_numbers must be a DSAParameterNumbers instance."
)
self._y = y
self._parameter_numbers = parameter_numbers
@property
def y(self):
return self._y
@property
def parameter_numbers(self):
return self._parameter_numbers
def public_key(self, backend):
return backend.load_dsa_public_numbers(self)
class DSAPrivateNumbers(object):
def __init__(self, x, public_numbers):
if not isinstance(x, six.integer_types):
raise TypeError("DSAPrivateNumbers x argument must be an integer.")
if not isinstance(public_numbers, DSAPublicNumbers):
raise TypeError(
"public_numbers must be a DSAPublicNumbers instance."
)
self._public_numbers = public_numbers
self._x = x
@property
def x(self):
return self._x
@property
def public_numbers(self):
return self._public_numbers
def private_key(self, backend):
return backend.load_dsa_private_numbers(self)
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