/usr/lib/python2.7/dist-packages/paramiko/ecdsakey.py is in python-paramiko 1.16.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | # 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 distrubuted 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.
"""
ECDSA keys
"""
import binascii
from hashlib import sha256
from ecdsa import SigningKey, VerifyingKey, der, curves
from paramiko.common import four_byte, one_byte
from paramiko.message import Message
from paramiko.pkey import PKey
from paramiko.py3compat import byte_chr, u
from paramiko.ssh_exception import SSHException
class ECDSAKey (PKey):
"""
Representation of an ECDSA key which can be used to sign and verify SSH2
data.
"""
def __init__(self, msg=None, data=None, filename=None, password=None,
vals=None, file_obj=None, validate_point=True):
self.verifying_key = None
self.signing_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 vals is not None:
self.signing_key, self.verifying_key = vals
else:
if msg is None:
raise SSHException('Key object may not be empty')
if msg.get_text() != 'ecdsa-sha2-nistp256':
raise SSHException('Invalid key')
curvename = msg.get_text()
if curvename != 'nistp256':
raise SSHException("Can't handle curve of type %s" % curvename)
pointinfo = msg.get_binary()
if pointinfo[0:1] != four_byte:
raise SSHException('Point compression is being used: %s' %
binascii.hexlify(pointinfo))
self.verifying_key = VerifyingKey.from_string(pointinfo[1:],
curve=curves.NIST256p,
validate_point=validate_point)
self.size = 256
def asbytes(self):
key = self.verifying_key
m = Message()
m.add_string('ecdsa-sha2-nistp256')
m.add_string('nistp256')
point_str = four_byte + key.to_string()
m.add_string(point_str)
return m.asbytes()
def __str__(self):
return self.asbytes()
def __hash__(self):
h = hash(self.get_name())
h = h * 37 + hash(self.verifying_key.pubkey.point.x())
h = h * 37 + hash(self.verifying_key.pubkey.point.y())
return hash(h)
def get_name(self):
return 'ecdsa-sha2-nistp256'
def get_bits(self):
return self.size
def can_sign(self):
return self.signing_key is not None
def sign_ssh_data(self, data):
sig = self.signing_key.sign_deterministic(
data, sigencode=self._sigencode, hashfunc=sha256)
m = Message()
m.add_string('ecdsa-sha2-nistp256')
m.add_string(sig)
return m
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ecdsa-sha2-nistp256':
return False
sig = msg.get_binary()
# verify the signature by SHA'ing the data and encrypting it
# using the public key.
hash_obj = sha256(data).digest()
return self.verifying_key.verify_digest(sig, hash_obj,
sigdecode=self._sigdecode)
def write_private_key_file(self, filename, password=None):
key = self.signing_key or self.verifying_key
self._write_private_key_file('EC', filename, key.to_der(), password)
def write_private_key(self, file_obj, password=None):
key = self.signing_key or self.verifying_key
self._write_private_key('EC', file_obj, key.to_der(), password)
@staticmethod
def generate(curve=curves.NIST256p, progress_func=None):
"""
Generate a new private ECDSA key. This factory function can be used to
generate a new host key or authentication key.
:param function progress_func: Not used for this type of key.
:returns: A new private key (`.ECDSAKey`) object
"""
signing_key = SigningKey.generate(curve)
key = ECDSAKey(vals=(signing_key, signing_key.get_verifying_key()))
return key
### internals...
def _from_private_key_file(self, filename, password):
data = self._read_private_key_file('EC', filename, password)
self._decode_key(data)
def _from_private_key(self, file_obj, password):
data = self._read_private_key('EC', file_obj, password)
self._decode_key(data)
ALLOWED_PADDINGS = [one_byte, byte_chr(2) * 2, byte_chr(3) * 3, byte_chr(4) * 4,
byte_chr(5) * 5, byte_chr(6) * 6, byte_chr(7) * 7]
def _decode_key(self, data):
s, padding = der.remove_sequence(data)
if padding:
if padding not in self.ALLOWED_PADDINGS:
raise ValueError("weird padding: %s" % u(binascii.hexlify(data)))
data = data[:-len(padding)]
key = SigningKey.from_der(data)
self.signing_key = key
self.verifying_key = key.get_verifying_key()
self.size = 256
def _sigencode(self, r, s, order):
msg = Message()
msg.add_mpint(r)
msg.add_mpint(s)
return msg.asbytes()
def _sigdecode(self, sig, order):
msg = Message(sig)
r = msg.get_mpint()
s = msg.get_mpint()
return r, s
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