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# Licensed under the Apache License, Version 2.0 (the "License"); 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.
"""Wrap cryptography verify with verifier."""
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives.asymmetric import utils
from cryptography.hazmat.primitives import hashes
class RSAVerifier(object):
def __init__(self, signature, hash_method, public_key, padding):
self._signature = signature
self._hash_method = hash_method
self._public_key = public_key
self._padding = padding
self._hasher = hashes.Hash(hash_method, default_backend())
def update(self, data):
self._hasher.update(data)
def verify(self):
digest = self._hasher.finalize()
self._public_key.verify(
self._signature,
digest,
self._padding,
utils.Prehashed(self._hash_method)
)
class ECCVerifier(object):
def __init__(self, signature, hash_method, public_key):
self._signature = signature
self._hash_method = hash_method
self._public_key = public_key
self._hasher = hashes.Hash(hash_method, default_backend())
def update(self, data):
self._hasher.update(data)
def verify(self):
digest = self._hasher.finalize()
self._public_key.verify(
self._signature,
digest,
ec.ECDSA(utils.Prehashed(self._hash_method))
)
class DSAVerifier(object):
def __init__(self, signature, hash_method, public_key):
self._signature = signature
self._hash_method = hash_method
self._public_key = public_key
self._hasher = hashes.Hash(hash_method, default_backend())
def update(self, data):
self._hasher.update(data)
def verify(self):
digest = self._hasher.finalize()
self._public_key.verify(
self._signature,
digest,
utils.Prehashed(self._hash_method)
)
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