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📁 ..
📄 AES.py(8.71 KB)
📄 AES.pyi(3.63 KB)
📄 ARC2.py(6.85 KB)
📄 ARC2.pyi(980 B)
📄 ARC4.py(5 KB)
📄 ARC4.pyi(413 B)
📄 Blowfish.py(5.82 KB)
📄 Blowfish.pyi(1016 B)
📄 CAST.py(5.93 KB)
📄 CAST.pyi(981 B)
📄 ChaCha20.py(10.48 KB)
📄 ChaCha20.pyi(788 B)
📄 ChaCha20_Poly1305.py(11.29 KB)
📄 ChaCha20_Poly1305.pyi(1.08 KB)
📄 DES.py(5.81 KB)
📄 DES.pyi(961 B)
📄 DES3.py(6.76 KB)
📄 DES3.pyi(1.01 KB)
📄 PKCS1_OAEP.py(8.62 KB)
📄 PKCS1_OAEP.pyi(1.15 KB)
📄 PKCS1_v1_5.py(7.95 KB)
📄 PKCS1_v1_5.pyi(686 B)
📄 Salsa20.py(6.2 KB)
📄 Salsa20.pyi(751 B)
📄 _ARC4.abi3.so(15.57 KB)
📄 _EKSBlowfish.py(5.08 KB)
📄 _EKSBlowfish.pyi(266 B)
📄 _Salsa20.abi3.so(15.71 KB)
📄 __init__.py(2.78 KB)
📄 __init__.pyi(0 B)
📁 __pycache__
📄 _chacha20.abi3.so(15.69 KB)
📄 _mode_cbc.py(10.63 KB)
📄 _mode_cbc.pyi(687 B)
📄 _mode_ccm.py(23.8 KB)
📄 _mode_ccm.pyi(1.56 KB)
📄 _mode_cfb.py(10.47 KB)
📄 _mode_cfb.pyi(727 B)
📄 _mode_ctr.py(15.44 KB)
📄 _mode_ctr.pyi(800 B)
📄 _mode_eax.py(14.11 KB)
📄 _mode_eax.pyi(1.51 KB)
📄 _mode_ecb.py(8.11 KB)
📄 _mode_ecb.pyi(592 B)
📄 _mode_gcm.py(20.8 KB)
📄 _mode_gcm.pyi(1.5 KB)
📄 _mode_ocb.py(19.47 KB)
📄 _mode_ocb.pyi(1.2 KB)
📄 _mode_ofb.py(9.97 KB)
📄 _mode_ofb.pyi(691 B)
📄 _mode_openpgp.py(6.89 KB)
📄 _mode_openpgp.pyi(556 B)
📄 _mode_siv.py(13.65 KB)
📄 _mode_siv.pyi(1.23 KB)
📄 _pkcs1_decode.abi3.so(15.59 KB)
📄 _raw_aes.abi3.so(31.95 KB)
📄 _raw_aesni.abi3.so(19.91 KB)
📄 _raw_arc2.abi3.so(19.7 KB)
📄 _raw_blowfish.abi3.so(23.68 KB)
📄 _raw_cast.abi3.so(27.91 KB)
📄 _raw_cbc.abi3.so(15.56 KB)
📄 _raw_cfb.abi3.so(15.85 KB)
📄 _raw_ctr.abi3.so(15.9 KB)
📄 _raw_des.abi3.so(48.09 KB)
📄 _raw_des3.abi3.so(48.1 KB)
📄 _raw_ecb.abi3.so(15.41 KB)
📄 _raw_eksblowfish.abi3.so(31.7 KB)
📄 _raw_ocb.abi3.so(19.82 KB)
📄 _raw_ofb.abi3.so(15.57 KB)

Editing: Salsa20.py

# -*- coding: utf-8 -*-
#
# Cipher/Salsa20.py : Salsa20 stream cipher (http://cr.yp.to/snuffle.html)
#
# Contributed by Fabrizio Tarizzo <fabrizio@fabriziotarizzo.org>.
#
# ===================================================================
# The contents of this file are dedicated to the public domain.  To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ===================================================================

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, is_writeable_buffer)

from Crypto.Random import get_random_bytes

_raw_salsa20_lib = load_pycryptodome_raw_lib("Crypto.Cipher._Salsa20",
                    """
                    int Salsa20_stream_init(uint8_t *key, size_t keylen,
                                            uint8_t *nonce, size_t nonce_len,
                                            void **pSalsaState);
                    int Salsa20_stream_destroy(void *salsaState);
                    int Salsa20_stream_encrypt(void *salsaState,
                                               const uint8_t in[],
                                               uint8_t out[], size_t len);
                    """)

class Salsa20Cipher:
    """Salsa20 cipher object. Do not create it directly. Use :py:func:`new`
    instead.

:var nonce: The nonce with length 8
    :vartype nonce: byte string
    """

def __init__(self, key, nonce):
        """Initialize a Salsa20 cipher object

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

if len(key) not in key_size:
            raise ValueError("Incorrect key length for Salsa20 (%d bytes)" % len(key))

if len(nonce) != 8:
            raise ValueError("Incorrect nonce length for Salsa20 (%d bytes)" %
                             len(nonce))

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

self._state = VoidPointer()
        result = _raw_salsa20_lib.Salsa20_stream_init(
                        c_uint8_ptr(key),
                        c_size_t(len(key)),
                        c_uint8_ptr(nonce),
                        c_size_t(len(nonce)),
                        self._state.address_of())
        if result:
            raise ValueError("Error %d instantiating a Salsa20 cipher")
        self._state = SmartPointer(self._state.get(),
                                   _raw_salsa20_lib.Salsa20_stream_destroy)

self.block_size = 1
        self.key_size = len(key)

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 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_salsa20_lib.Salsa20_stream_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 Salsa20" % result)

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``.
        """

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

def new(key, nonce=None):
    """Create a new Salsa20 cipher

:keyword key: The secret key to use. It must be 16 or 32 bytes long.
    :type key: bytes/bytearray/memoryview

:keyword nonce:
        A value that must never be reused for any other encryption
        done with this key. It must be 8 bytes long.

If not provided, a random byte string will be generated (you can read
        it back via the ``nonce`` attribute of the returned object).
    :type nonce: bytes/bytearray/memoryview

:Return: a :class:`Crypto.Cipher.Salsa20.Salsa20Cipher` object
    """

if nonce is None:
        nonce = get_random_bytes(8)

return Salsa20Cipher(key, nonce)

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

# Size of a key (in bytes)
key_size = (16, 32)

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