FM / Cipher

/opt/imh-python/lib/python3.9/site-packages/Crypto/Cipher/

/opt/imh-python/lib/python3.9/site-packages/Crypto/Cipher

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
AES.py	9541	0644	edit dl rm
AES.pyi	1343	0644	edit dl rm
ARC2.py	7010	0644	edit dl rm
ARC2.pyi	954	0644	edit dl rm
ARC4.py	5152	0644	edit dl rm
ARC4.pyi	431	0644	edit dl rm
Blowfish.py	5964	0644	edit dl rm
Blowfish.pyi	990	0644	edit dl rm
CAST.py	6071	0644	edit dl rm
CAST.pyi	955	0644	edit dl rm
ChaCha20.py	10734	0644	edit dl rm
ChaCha20.pyi	762	0644	edit dl rm
ChaCha20_Poly1305.py	11529	0644	edit dl rm
ChaCha20_Poly1305.pyi	1068	0644	edit dl rm
DES.py	5947	0644	edit dl rm
DES.pyi	935	0644	edit dl rm
DES3.py	6925	0644	edit dl rm
DES3.pyi	1005	0644	edit dl rm
PKCS1_OAEP.py	8824	0644	edit dl rm
PKCS1_OAEP.pyi	1179	0644	edit dl rm
PKCS1_v1_5.py	7943	0644	edit dl rm
PKCS1_v1_5.pyi	567	0644	edit dl rm
Salsa20.py	6349	0644	edit dl rm
Salsa20.pyi	744	0644	edit dl rm
_ARC4.cpython-39-x86_64-linux-gnu.so	8072	0755	edit dl rm
_chacha20.cpython-39-x86_64-linux-gnu.so	11024	0755	edit dl rm
_EKSBlowfish.py	5205	0644	edit dl rm
_EKSBlowfish.pyi	266	0644	edit dl rm
_mode_cbc.py	10951	0644	edit dl rm
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_mode_ccm.py	24444	0644	edit dl rm
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_mode_cfb.py	10801	0644	edit dl rm
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_mode_ctr.py	15880	0644	edit dl rm
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_mode_eax.py	14511	0644	edit dl rm
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_mode_ecb.py	8210	0644	edit dl rm
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_mode_openpgp.py	7053	0644	edit dl rm
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_mode_siv.py	14062	0644	edit dl rm
_mode_siv.pyi	1261	0644	edit dl rm
_raw_aes.cpython-39-x86_64-linux-gnu.so	26816	0755	edit dl rm
_raw_aesni.cpython-39-x86_64-linux-gnu.so	11648	0755	edit dl rm
_raw_arc2.cpython-39-x86_64-linux-gnu.so	10528	0755	edit dl rm
_raw_blowfish.cpython-39-x86_64-linux-gnu.so	13568	0755	edit dl rm
_raw_cast.cpython-39-x86_64-linux-gnu.so	19864	0755	edit dl rm
_raw_cbc.cpython-39-x86_64-linux-gnu.so	8672	0755	edit dl rm
_raw_cfb.cpython-39-x86_64-linux-gnu.so	8928	0755	edit dl rm
_raw_ctr.cpython-39-x86_64-linux-gnu.so	9200	0755	edit dl rm
_raw_des.cpython-39-x86_64-linux-gnu.so	45120	0755	edit dl rm
_raw_des3.cpython-39-x86_64-linux-gnu.so	45408	0755	edit dl rm
_raw_ecb.cpython-39-x86_64-linux-gnu.so	6528	0755	edit dl rm
_raw_eksblowfish.cpython-39-x86_64-linux-gnu.so	18888	0755	edit dl rm
_raw_ocb.cpython-39-x86_64-linux-gnu.so	11456	0755	edit dl rm
_raw_ofb.cpython-39-x86_64-linux-gnu.so	7496	0755	edit dl rm
_Salsa20.cpython-39-x86_64-linux-gnu.so	8824	0755	edit dl rm
__init__.py	2844	0644	edit dl rm
__init__.pyi	0	0644	edit dl rm

Edit: /opt/imh-python/lib/python3.9/site-packages/Crypto/Cipher/ChaCha20.py (10734B)

# ===================================================================
#
# Copyright (c) 2014, Legrandin <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.
# ===================================================================

from Crypto.Random import get_random_bytes

from Crypto.Util.py3compat import _copy_bytes
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
                                  create_string_buffer,
                                  get_raw_buffer, VoidPointer,
                                  SmartPointer, c_size_t,
                                  c_uint8_ptr, c_ulong,
                                  is_writeable_buffer)

_raw_chacha20_lib = load_pycryptodome_raw_lib("Crypto.Cipher._chacha20",
                    """
                    int chacha20_init(void **pState,
                                      const uint8_t *key,
                                      size_t keySize,
                                      const uint8_t *nonce,
                                      size_t nonceSize);

int chacha20_destroy(void *state);

int chacha20_encrypt(void *state,
                                         const uint8_t in[],
                                         uint8_t out[],
                                         size_t len);

int chacha20_seek(void *state,
                                      unsigned long block_high,
                                      unsigned long block_low,
                                      unsigned offset);
                    int hchacha20(  const uint8_t key[32],
                                    const uint8_t nonce16[16],
                                    uint8_t subkey[32]);
                    """)

def _HChaCha20(key, nonce):

assert(len(key) == 32)
    assert(len(nonce) == 16)

subkey = bytearray(32)
    result = _raw_chacha20_lib.hchacha20(
                c_uint8_ptr(key),
                c_uint8_ptr(nonce),
                c_uint8_ptr(subkey))
    if result:
        raise ValueError("Error %d when deriving subkey with HChaCha20" % result)

return subkey

class ChaCha20Cipher(object):
    """ChaCha20 (or XChaCha20) cipher object.
    Do not create it directly. Use :py:func:`new` instead.

:var nonce: The nonce with length 8, 12 or 24 bytes
    :vartype nonce: bytes
    """

block_size = 1

def __init__(self, key, nonce):
        """Initialize a ChaCha20/XChaCha20 cipher object

See also `new()` at the module level."""

# XChaCha20 requires a key derivation with HChaCha20
        # See 2.3 in https://tools.ietf.org/html/draft-arciszewski-xchacha-03
        if len(nonce) == 24:
            key = _HChaCha20(key, nonce[:16])
            nonce = b'\x00' * 4 + nonce[16:]
            self._name = "XChaCha20"
        else:
            self._name = "ChaCha20"

self.nonce = _copy_bytes(None, None, nonce)

self._next = ( self.encrypt, self.decrypt )

self._state = VoidPointer()
        result = _raw_chacha20_lib.chacha20_init(
                        self._state.address_of(),
                        c_uint8_ptr(key),
                        c_size_t(len(key)),
                        self.nonce,
                        c_size_t(len(nonce)))
        if result:
            raise ValueError("Error %d instantiating a %s cipher" % (result,
                                                                     self._name))
        self._state = SmartPointer(self._state.get(),
                                   _raw_chacha20_lib.chacha20_destroy)

def encrypt(self, plaintext, output=None):
        """Encrypt a piece of data.

Args:
          plaintext(bytes/bytearray/memoryview): The data to encrypt, of any size.
        Keyword Args:
          output(bytes/bytearray/memoryview): The location where the ciphertext
            is written to. If ``None``, the ciphertext is returned.
        Returns:
          If ``output`` is ``None``, the ciphertext is returned as ``bytes``.
          Otherwise, ``None``.
        """

if self.encrypt not in self._next:
            raise TypeError("Cipher object can only be used for decryption")
        self._next = ( self.encrypt, )
        return self._encrypt(plaintext, output)

def _encrypt(self, plaintext, output):
        """Encrypt without FSM checks"""

if output is None:
            ciphertext = create_string_buffer(len(plaintext))
        else:
            ciphertext = output

if not is_writeable_buffer(output):
                raise TypeError("output must be a bytearray or a writeable memoryview")

if len(plaintext) != len(output):
                raise ValueError("output must have the same length as the input"
                                 "  (%d bytes)" % len(plaintext))

result = _raw_chacha20_lib.chacha20_encrypt(
                                         self._state.get(),
                                         c_uint8_ptr(plaintext),
                                         c_uint8_ptr(ciphertext),
                                         c_size_t(len(plaintext)))
        if result:
            raise ValueError("Error %d while encrypting with %s" % (result, self._name))

if output is None:
            return get_raw_buffer(ciphertext)
        else:
            return None

def decrypt(self, ciphertext, output=None):
        """Decrypt a piece of data.

Args:
          ciphertext(bytes/bytearray/memoryview): The data to decrypt, of any size.
        Keyword Args:
          output(bytes/bytearray/memoryview): The location where the plaintext
            is written to. If ``None``, the plaintext is returned.
        Returns:
          If ``output`` is ``None``, the plaintext is returned as ``bytes``.
          Otherwise, ``None``.
        """

if self.decrypt not in self._next:
            raise TypeError("Cipher object can only be used for encryption")
        self._next = ( self.decrypt, )

try:
            return self._encrypt(ciphertext, output)
        except ValueError as e:
            raise ValueError(str(e).replace("enc", "dec"))

def seek(self, position):
        """Seek to a certain position in the key stream.

Args:
          position (integer):
            The absolute position within the key stream, in bytes.
        """

position, offset = divmod(position, 64)
        block_low = position & 0xFFFFFFFF
        block_high = position >> 32

result = _raw_chacha20_lib.chacha20_seek(
                                                 self._state.get(),
                                                 c_ulong(block_high),
                                                 c_ulong(block_low),
                                                 offset
                                                 )
        if result:
            raise ValueError("Error %d while seeking with %s" % (result, self._name))

def _derive_Poly1305_key_pair(key, nonce):
    """Derive a tuple (r, s, nonce) for a Poly1305 MAC.

If nonce is ``None``, a new 12-byte nonce is generated.
    """

if len(key) != 32:
        raise ValueError("Poly1305 with ChaCha20 requires a 32-byte key")

if nonce is None:
        padded_nonce = nonce = get_random_bytes(12)
    elif len(nonce) == 8:
        # See RFC7538, 2.6: [...] ChaCha20 as specified here requires a 96-bit
        # nonce.  So if the provided nonce is only 64-bit, then the first 32
        # bits of the nonce will be set to a constant number.
        # This will usually be zero, but for protocols with multiple senders it may be
        # different for each sender, but should be the same for all
        # invocations of the function with the same key by a particular
        # sender.
        padded_nonce = b'\x00\x00\x00\x00' + nonce
    elif len(nonce) == 12:
        padded_nonce = nonce
    else:
        raise ValueError("Poly1305 with ChaCha20 requires an 8- or 12-byte nonce")

rs = new(key=key, nonce=padded_nonce).encrypt(b'\x00' * 32)
    return rs[:16], rs[16:], nonce

def new(**kwargs):
    """Create a new ChaCha20 or XChaCha20 cipher

Keyword Args:
        key (bytes/bytearray/memoryview): The secret key to use.
            It must be 32 bytes long.
        nonce (bytes/bytearray/memoryview): A mandatory value that
            must never be reused for any other encryption
            done with this key.

For ChaCha20, it must be 8 or 12 bytes long.

For XChaCha20, it must be 24 bytes long.

If not provided, 8 bytes will be randomly generated
            (you can find them back in the ``nonce`` attribute).

:Return: a :class:`Crypto.Cipher.ChaCha20.ChaCha20Cipher` object
    """

try:
        key = kwargs.pop("key")
    except KeyError as e:
        raise TypeError("Missing parameter %s" % e)

nonce = kwargs.pop("nonce", None)
    if nonce is None:
        nonce = get_random_bytes(8)

if len(key) != 32:
        raise ValueError("ChaCha20/XChaCha20 key must be 32 bytes long")

if len(nonce) not in (8, 12, 24):
        raise ValueError("Nonce must be 8/12 bytes(ChaCha20) or 24 bytes (XChaCha20)")

if kwargs:
        raise TypeError("Unknown parameters: " + str(kwargs))

return ChaCha20Cipher(key, nonce)

# Size of a data block (in bytes)
block_size = 1

# Size of a key (in bytes)
key_size = 32

cmd: