/usr/lib/python3/dist-packages/paramiko/rsakey.py is in python3-paramiko 2.0.0-1ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
"""
RSA keys.
"""
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from paramiko.message import Message
from paramiko.pkey import PKey
from paramiko.ssh_exception import SSHException
class RSAKey(PKey):
"""
Representation of an RSA key which can be used to sign and verify SSH2
data.
"""
def __init__(self, msg=None, data=None, filename=None, password=None, key=None, file_obj=None):
self.key = None
if file_obj is not None:
self._from_private_key(file_obj, password)
return
if filename is not None:
self._from_private_key_file(filename, password)
return
if (msg is None) and (data is not None):
msg = Message(data)
if key is not None:
self.key = key
else:
if msg is None:
raise SSHException('Key object may not be empty')
if msg.get_text() != 'ssh-rsa':
raise SSHException('Invalid key')
self.key = rsa.RSAPublicNumbers(
e=msg.get_mpint(), n=msg.get_mpint()
).public_key(default_backend())
@property
def size(self):
return self.key.key_size
@property
def public_numbers(self):
if isinstance(self.key, rsa.RSAPrivateKey):
return self.key.private_numbers().public_numbers
else:
return self.key.public_numbers()
def asbytes(self):
m = Message()
m.add_string('ssh-rsa')
m.add_mpint(self.public_numbers.e)
m.add_mpint(self.public_numbers.n)
return m.asbytes()
def __str__(self):
return self.asbytes()
def __hash__(self):
h = hash(self.get_name())
h = h * 37 + hash(self.public_numbers.e)
h = h * 37 + hash(self.public_numbers.n)
return hash(h)
def get_name(self):
return 'ssh-rsa'
def get_bits(self):
return self.size
def can_sign(self):
return isinstance(self.key, rsa.RSAPrivateKey)
def sign_ssh_data(self, data):
signer = self.key.signer(
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
signer.update(data)
sig = signer.finalize()
m = Message()
m.add_string('ssh-rsa')
m.add_string(sig)
return m
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ssh-rsa':
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
verifier = key.verifier(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
verifier.update(data)
try:
verifier.verify()
except InvalidSignature:
return False
else:
return True
def write_private_key_file(self, filename, password=None):
self._write_private_key_file(
filename,
self.key,
serialization.PrivateFormat.TraditionalOpenSSL,
password=password
)
def write_private_key(self, file_obj, password=None):
self._write_private_key(
file_obj,
self.key,
serialization.PrivateFormat.TraditionalOpenSSL,
password=password
)
@staticmethod
def generate(bits, progress_func=None):
"""
Generate a new private RSA key. This factory function can be used to
generate a new host key or authentication key.
:param int bits: number of bits the generated key should be.
:param function progress_func: Unused
:return: new `.RSAKey` private key
"""
key = rsa.generate_private_key(
public_exponent=65537, key_size=bits, backend=default_backend()
)
return RSAKey(key=key)
### internals...
def _from_private_key_file(self, filename, password):
data = self._read_private_key_file('RSA', filename, password)
self._decode_key(data)
def _from_private_key(self, file_obj, password):
data = self._read_private_key('RSA', file_obj, password)
self._decode_key(data)
def _decode_key(self, data):
try:
key = serialization.load_der_private_key(
data, password=None, backend=default_backend()
)
except ValueError as e:
raise SSHException(str(e))
assert isinstance(key, rsa.RSAPrivateKey)
self.key = key
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