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Name	Size	Permission
__init__.py	3.83 KB	-rw-r--r--
__init__.pyc	3.69 KB	-rw-r--r--
__init__.pyo	3.69 KB	-rw-r--r--
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_winapi.py	10.91 KB	-rw-r--r--
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agent.py	12.29 KB	-rw-r--r--
agent.pyc	15.79 KB	-rw-r--r--
agent.pyo	15.79 KB	-rw-r--r--
auth_handler.py	26.4 KB	-rw-r--r--
auth_handler.pyc	18.3 KB	-rw-r--r--
auth_handler.pyo	18.3 KB	-rw-r--r--
ber.py	4.16 KB	-rw-r--r--
ber.pyc	4.1 KB	-rw-r--r--
ber.pyo	4.1 KB	-rw-r--r--
buffered_pipe.py	7.33 KB	-rw-r--r--
buffered_pipe.pyc	6.98 KB	-rw-r--r--
buffered_pipe.pyo	6.98 KB	-rw-r--r--
channel.py	46.77 KB	-rw-r--r--
channel.pyc	47.31 KB	-rw-r--r--
channel.pyo	47.24 KB	-rw-r--r--
client.py	27.13 KB	-rw-r--r--
client.pyc	23.24 KB	-rw-r--r--
client.pyo	23.24 KB	-rw-r--r--
common.py	7.41 KB	-rw-r--r--
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compress.py	1.22 KB	-rw-r--r--
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compress.pyo	1.43 KB	-rw-r--r--
config.py	10.78 KB	-rw-r--r--
config.pyc	7.55 KB	-rw-r--r--
config.pyo	7.55 KB	-rw-r--r--
dsskey.py	7.9 KB	-rw-r--r--
dsskey.pyc	7.84 KB	-rw-r--r--
dsskey.pyo	7.84 KB	-rw-r--r--
ecdsakey.py	9.37 KB	-rw-r--r--
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ecdsakey.pyo	10.3 KB	-rw-r--r--
file.py	18.76 KB	-rw-r--r--
file.pyc	16 KB	-rw-r--r--
file.pyo	16 KB	-rw-r--r--
hostkeys.py	12.08 KB	-rw-r--r--
hostkeys.pyc	13.54 KB	-rw-r--r--
hostkeys.pyo	13.49 KB	-rw-r--r--
kex_gex.py	9.67 KB	-rw-r--r--
kex_gex.pyc	7.73 KB	-rw-r--r--
kex_gex.pyo	7.73 KB	-rw-r--r--
kex_group1.py	5.42 KB	-rw-r--r--
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kex_group14.py	1.67 KB	-rw-r--r--
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kex_gss.py	24.28 KB	-rw-r--r--
kex_gss.pyc	19.46 KB	-rw-r--r--
kex_gss.pyo	19.46 KB	-rw-r--r--
message.py	9.29 KB	-rw-r--r--
message.pyc	11.68 KB	-rw-r--r--
message.pyo	11.68 KB	-rw-r--r--
packet.py	18.95 KB	-rw-r--r--
packet.pyc	15.93 KB	-rw-r--r--
packet.pyo	15.93 KB	-rw-r--r--
pipe.py	3.91 KB	-rw-r--r--
pipe.pyc	5.37 KB	-rw-r--r--
pipe.pyo	5.37 KB	-rw-r--r--
pkey.py	13.01 KB	-rw-r--r--
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primes.py	4.83 KB	-rw-r--r--
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proxy.py	4.38 KB	-rw-r--r--
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py3compat.py	3.87 KB	-rw-r--r--
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resource.py	2.49 KB	-rw-r--r--
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resource.pyo	2.21 KB	-rw-r--r--
rsakey.py	5.43 KB	-rw-r--r--
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server.py	29.38 KB	-rw-r--r--
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sftp.py	6.06 KB	-rw-r--r--
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sftp_attr.py	7.7 KB	-rw-r--r--
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sftp_client.py	31.47 KB	-rw-r--r--
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sftp_client.pyo	31.51 KB	-rw-r--r--
sftp_file.py	19.59 KB	-rw-r--r--
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sftp_handle.py	7.34 KB	-rw-r--r--
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sftp_server.py	18 KB	-rw-r--r--
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ssh_exception.py	6.03 KB	-rw-r--r--
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ssh_gss.py	21.39 KB	-rw-r--r--
ssh_gss.pyc	18.78 KB	-rw-r--r--
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transport.py	103.08 KB	-rw-r--r--
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win_pageant.py	4.11 KB	-rw-r--r--
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Code Editor : dsskey.py

# Copyright (C) 2003-2007  Robey Pointer <robeypointer@gmail.com>
#
# 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.

"""
DSS 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 dsa
from cryptography.hazmat.primitives.asymmetric.utils import (
    decode_dss_signature, encode_dss_signature
)

from paramiko import util
from paramiko.common import zero_byte
from paramiko.ssh_exception import SSHException
from paramiko.message import Message
from paramiko.ber import BER, BERException
from paramiko.pkey import PKey

class DSSKey(PKey):
    """
    Representation of a DSS key which can be used to sign an verify SSH2
    data.
    """

def __init__(self, msg=None, data=None, filename=None, password=None, vals=None, file_obj=None):
        self.p = None
        self.q = None
        self.g = None
        self.y = None
        self.x = 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 vals is not None:
            self.p, self.q, self.g, self.y = vals
        else:
            if msg is None:
                raise SSHException('Key object may not be empty')
            if msg.get_text() != 'ssh-dss':
                raise SSHException('Invalid key')
            self.p = msg.get_mpint()
            self.q = msg.get_mpint()
            self.g = msg.get_mpint()
            self.y = msg.get_mpint()
        self.size = util.bit_length(self.p)

def asbytes(self):
        m = Message()
        m.add_string('ssh-dss')
        m.add_mpint(self.p)
        m.add_mpint(self.q)
        m.add_mpint(self.g)
        m.add_mpint(self.y)
        return m.asbytes()

def __str__(self):
        return self.asbytes()

def __hash__(self):
        h = hash(self.get_name())
        h = h * 37 + hash(self.p)
        h = h * 37 + hash(self.q)
        h = h * 37 + hash(self.g)
        h = h * 37 + hash(self.y)
        # h might be a long by now...
        return hash(h)

def get_name(self):
        return 'ssh-dss'

def get_bits(self):
        return self.size

def can_sign(self):
        return self.x is not None

def sign_ssh_data(self, data):
        key = dsa.DSAPrivateNumbers(
            x=self.x,
            public_numbers=dsa.DSAPublicNumbers(
                y=self.y,
                parameter_numbers=dsa.DSAParameterNumbers(
                    p=self.p,
                    q=self.q,
                    g=self.g
                )
            )
        ).private_key(backend=default_backend())
        signer = key.signer(hashes.SHA1())
        signer.update(data)
        r, s = decode_dss_signature(signer.finalize())

m = Message()
        m.add_string('ssh-dss')
        # apparently, in rare cases, r or s may be shorter than 20 bytes!
        rstr = util.deflate_long(r, 0)
        sstr = util.deflate_long(s, 0)
        if len(rstr) < 20:
            rstr = zero_byte * (20 - len(rstr)) + rstr
        if len(sstr) < 20:
            sstr = zero_byte * (20 - len(sstr)) + sstr
        m.add_string(rstr + sstr)
        return m

def verify_ssh_sig(self, data, msg):
        if len(msg.asbytes()) == 40:
            # spies.com bug: signature has no header
            sig = msg.asbytes()
        else:
            kind = msg.get_text()
            if kind != 'ssh-dss':
                return 0
            sig = msg.get_binary()

# pull out (r, s) which are NOT encoded as mpints
        sigR = util.inflate_long(sig[:20], 1)
        sigS = util.inflate_long(sig[20:], 1)

signature = encode_dss_signature(sigR, sigS)

key = dsa.DSAPublicNumbers(
            y=self.y,
            parameter_numbers=dsa.DSAParameterNumbers(
                p=self.p,
                q=self.q,
                g=self.g
            )
        ).public_key(backend=default_backend())
        verifier = key.verifier(signature, hashes.SHA1())
        verifier.update(data)
        try:
            verifier.verify()
        except InvalidSignature:
            return False
        else:
            return True

def write_private_key_file(self, filename, password=None):
        key = dsa.DSAPrivateNumbers(
            x=self.x,
            public_numbers=dsa.DSAPublicNumbers(
                y=self.y,
                parameter_numbers=dsa.DSAParameterNumbers(
                    p=self.p,
                    q=self.q,
                    g=self.g
                )
            )
        ).private_key(backend=default_backend())

self._write_private_key_file(
            filename,
            key,
            serialization.PrivateFormat.TraditionalOpenSSL,
            password=password
        )

def write_private_key(self, file_obj, password=None):
        key = dsa.DSAPrivateNumbers(
            x=self.x,
            public_numbers=dsa.DSAPublicNumbers(
                y=self.y,
                parameter_numbers=dsa.DSAParameterNumbers(
                    p=self.p,
                    q=self.q,
                    g=self.g
                )
            )
        ).private_key(backend=default_backend())

self._write_private_key(
            file_obj,
            key,
            serialization.PrivateFormat.TraditionalOpenSSL,
            password=password
        )

@staticmethod
    def generate(bits=1024, progress_func=None):
        """
        Generate a new private DSS 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 `.DSSKey` private key
        """
        numbers = dsa.generate_private_key(
            bits, backend=default_backend()
        ).private_numbers()
        key = DSSKey(vals=(
            numbers.public_numbers.parameter_numbers.p,
            numbers.public_numbers.parameter_numbers.q,
            numbers.public_numbers.parameter_numbers.g,
            numbers.public_numbers.y
        ))
        key.x = numbers.x
        return key

###  internals...

def _from_private_key_file(self, filename, password):
        data = self._read_private_key_file('DSA', filename, password)
        self._decode_key(data)

def _from_private_key(self, file_obj, password):
        data = self._read_private_key('DSA', file_obj, password)
        self._decode_key(data)

def _decode_key(self, data):
        # private key file contains:
        # DSAPrivateKey = { version = 0, p, q, g, y, x }
        try:
            keylist = BER(data).decode()
        except BERException as e:
            raise SSHException('Unable to parse key file: ' + str(e))
        if (type(keylist) is not list) or (len(keylist) < 6) or (keylist[0] != 0):
            raise SSHException('not a valid DSA private key file (bad ber encoding)')
        self.p = keylist[1]
        self.q = keylist[2]
        self.g = keylist[3]
        self.y = keylist[4]
        self.x = keylist[5]
        self.size = util.bit_length(self.p)

${this.title}

Code Editor : dsskey.py