FM / PublicKey

/opt/imh-python/lib/python3.9/site-packages/Cryptodome/PublicKey/

/opt/imh-python/lib/python3.9/site-packages/Cryptodome/PublicKey

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
DSA.py	22363	0644	edit dl rm
DSA.pyi	1353	0644	edit dl rm
ECC.py	42053	0644	edit dl rm
ECC.pyi	2358	0644	edit dl rm
ElGamal.py	8631	0644	edit dl rm
ElGamal.pyi	674	0644	edit dl rm
RSA.py	28834	0644	edit dl rm
RSA.pyi	1837	0644	edit dl rm
_ec_ws.cpython-39-x86_64-linux-gnu.so	716496	0755	edit dl rm
_openssh.py	5146	0644	edit dl rm
_openssh.pyi	324	0644	edit dl rm
__init__.py	3123	0644	edit dl rm
__init__.pyi	0	0644	edit dl rm

Edit: /opt/imh-python/lib/python3.9/site-packages/Cryptodome/PublicKey/_openssh.py (5146B)

# ===================================================================
#
# Copyright (c) 2019, Helder Eijs <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================

import struct

from Cryptodome.Cipher import AES
from Cryptodome.Hash import SHA512
from Cryptodome.Protocol.KDF import _bcrypt_hash
from Cryptodome.Util.strxor import strxor
from Cryptodome.Util.py3compat import tostr, bchr, bord

def read_int4(data):
    if len(data) < 4:
        raise ValueError("Insufficient data")
    value = struct.unpack(">I", data[:4])[0]
    return value, data[4:]

def read_bytes(data):
    size, data = read_int4(data)
    if len(data) < size:
        raise ValueError("Insufficient data (V)")
    return data[:size], data[size:]

def read_string(data):
    s, d = read_bytes(data)
    return tostr(s), d

def check_padding(pad):
    for v, x in enumerate(pad):
        if bord(x) != ((v + 1) & 0xFF):
            raise ValueError("Incorrect padding")

def import_openssh_private_generic(data, password):
    # https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.key?annotate=HEAD
    # https://github.com/openssh/openssh-portable/blob/master/sshkey.c
    # https://coolaj86.com/articles/the-openssh-private-key-format/
    # https://coolaj86.com/articles/the-ssh-public-key-format/

if not data.startswith(b'openssh-key-v1\x00'):
        raise ValueError("Incorrect magic value")
    data = data[15:]

ciphername, data = read_string(data)
    kdfname, data = read_string(data)
    kdfoptions, data = read_bytes(data)
    number_of_keys, data = read_int4(data)

if number_of_keys != 1:
        raise ValueError("We only handle 1 key at a time")

_, data = read_string(data)             # Public key
    encrypted, data = read_bytes(data)
    if data:
        raise ValueError("Too much data")

if len(encrypted) % 8 != 0:
        raise ValueError("Incorrect payload length")

# Decrypt if necessary
    if ciphername == 'none':
        decrypted = encrypted
    else:
        if (ciphername, kdfname) != ('aes256-ctr', 'bcrypt'):
            raise ValueError("Unsupported encryption scheme %s/%s" % (ciphername, kdfname))

salt, kdfoptions = read_bytes(kdfoptions)
        iterations, kdfoptions = read_int4(kdfoptions)

if len(salt) != 16:
            raise ValueError("Incorrect salt length")
        if kdfoptions:
            raise ValueError("Too much data in kdfoptions")

pwd_sha512 = SHA512.new(password).digest()
        # We need 32+16 = 48 bytes, therefore 2 bcrypt outputs are sufficient
        stripes = []
        constant = b"OxychromaticBlowfishSwatDynamite"
        for count in range(1, 3):
            salt_sha512 = SHA512.new(salt + struct.pack(">I", count)).digest()
            out_le = _bcrypt_hash(pwd_sha512, 6, salt_sha512, constant, False)
            out = struct.pack("<IIIIIIII", *struct.unpack(">IIIIIIII", out_le))
            acc = bytearray(out)
            for _ in range(1, iterations):
                out_le = _bcrypt_hash(pwd_sha512, 6, SHA512.new(out).digest(), constant, False)
                out = struct.pack("<IIIIIIII", *struct.unpack(">IIIIIIII", out_le))
                strxor(acc, out, output=acc)
            stripes.append(acc[:24])

result = b"".join([bchr(a)+bchr(b) for (a, b) in zip(*stripes)])

cipher = AES.new(result[:32],
                         AES.MODE_CTR,
                         nonce=b"",
                         initial_value=result[32:32+16])
        decrypted = cipher.decrypt(encrypted)

checkint1, decrypted = read_int4(decrypted)
    checkint2, decrypted = read_int4(decrypted)
    if checkint1 != checkint2:
        raise ValueError("Incorrect checksum")
    ssh_name, decrypted = read_string(decrypted)

return ssh_name, decrypted

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