diff options
Diffstat (limited to 'cryptography/hazmat')
| -rw-r--r-- | cryptography/hazmat/primitives/asymmetric/dsa.py | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/cryptography/hazmat/primitives/asymmetric/dsa.py b/cryptography/hazmat/primitives/asymmetric/dsa.py index a0631ce8..974db0a6 100644 --- a/cryptography/hazmat/primitives/asymmetric/dsa.py +++ b/cryptography/hazmat/primitives/asymmetric/dsa.py @@ -74,6 +74,49 @@ class DSAParameters(object): return self.generator +@utils.register_interface(interfaces.DSAPrivateKey) +class DSAPrivateKey(object): + def __init__(self, modulus, subgroup_order, generator, x, y): + _check_dsa_parameters(modulus, subgroup_order, generator) + if ( + not isinstance(x, six.integer_types) or + not isinstance(y, six.integer_types) + ): + raise TypeError("DSAPrivateKey arguments must be integers") + + if x <= 0 or x >= subgroup_order: + raise ValueError("x must be > 0 and < subgroup_order") + + if y != pow(generator, x, modulus): + raise ValueError("y must be equal to (generator ** x % modulus)") + + self._modulus = modulus + self._subgroup_order = subgroup_order + self._generator = generator + self._x = x + self._y = y + + @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): @@ -96,4 +139,4 @@ class DSAPublicKey(object): def parameters(self): return DSAParameters(self._modulus, self._subgroup_order, - self._generator)
\ No newline at end of file + self._generator) |