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# Copyright 2014 Google Inc. All rights reserved.
#
# 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.
"""ADB authentication using ``pycryptodome``.
.. rubric:: Contents
* :class:`PycryptodomeAuthSigner`
* :meth:`PycryptodomeAuthSigner.GetPublicKey`
* :meth:`PycryptodomeAuthSigner.Sign`
"""
from Cryptodome.Hash import SHA256
from Cryptodome.PublicKey import RSA
from Cryptodome.Signature import pkcs1_15
class PycryptodomeAuthSigner(object):
"""AuthSigner using the pycryptodome package.
Parameters
----------
rsa_key_path : str, None
The path to the private key
Attributes
----------
public_key : str
The contents of the public key file
rsa_key : Crypto.PublicKey.RSA.RsaKey
The contents of theprivate key
"""
def __init__(self, rsa_key_path=None):
super(PycryptodomeAuthSigner, self).__init__()
if rsa_key_path:
with open(rsa_key_path + '.pub', 'rb') as rsa_pub_file:
self.public_key = rsa_pub_file.read()
with open(rsa_key_path, 'rb') as rsa_priv_file:
self.rsa_key = RSA.import_key(rsa_priv_file.read())
def Sign(self, data):
"""Signs given data using a private key.
Parameters
----------
data : bytes, bytearray
The data to be signed
Returns
-------
bytes
The signed ``data``
"""
h = SHA256.new(data)
return pkcs1_15.new(self.rsa_key).sign(h)
def GetPublicKey(self):
"""Returns the public key in PEM format without headers or newlines.
Returns
-------
self.public_key : str
The contents of the public key file
"""
return self.public_key
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