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File Content: `_openssh.py`

# ===================================================================
#
# 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 Crypto.Cipher import AES
from Crypto.Hash import SHA512
from Crypto.Protocol.KDF import _bcrypt_hash
from Crypto.Util.strxor import strxor
from Crypto.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
Name	Size	Permission
__pycache__	---	0755
DSA.py	22378 bytes	0644
DSA.pyi	1381 bytes	0644
ECC.py	64765 bytes	0644
ECC.pyi	2563 bytes	0644
ElGamal.py	8615 bytes	0644
ElGamal.pyi	674 bytes	0644
RSA.py	29966 bytes	0644
RSA.pyi	2025 bytes	0644
__init__.py	3142 bytes	0644
__init__.pyi	0 bytes	0644
_ec_ws.abi3.so	960512 bytes	0755
_ed25519.abi3.so	220504 bytes	0755
_ed448.abi3.so	250552 bytes	0755
_openssh.py	5126 bytes	0644
_openssh.pyi	324 bytes	0644
_x25519.abi3.so	79432 bytes	0755
File Content: _openssh.py

File Content: `_openssh.py`
