scripts/crosscode-saved

@@ -1,127 +0,0 @@
-#!/usr/bin/env python3
-
-import base64
-import argparse
-from hashlib import md5
-from typing import IO
-from Crypto.Cipher import AES
-from Crypto import Random
-import sys
-
-
-CC_ENCRYPTION_MARKER_BYTES = b"[-!_0_!-]"
-CC_ENCRYPTION_PASSPHRASE = b":_.NaN0"
-
-
-def main():
-  parser = argparse.ArgumentParser()
-  # NOTE: Empty help strings are necessary for subparsers to show up in help.
-  subparsers = parser.add_subparsers(required=True, metavar="COMMAND")
-
-  subparser = subparsers.add_parser("pipe-decrypt", help="")
-  subparser.set_defaults(func=cmd_pipe_decrypt)
-  subparser.add_argument("input_file", nargs="?", default="-")
-  subparser.add_argument("output_file", nargs="?", default="-")
-
-  subparser = subparsers.add_parser("pipe-encrypt", help="")
-  subparser.set_defaults(func=cmd_pipe_encrypt)
-  subparser.add_argument("input_file", nargs="?", default="-")
-  subparser.add_argument("output_file", nargs="?", default="-")
-
-  args = parser.parse_args()
-  args.func(args)
-
-
-def cmd_pipe_decrypt(args: argparse.Namespace) -> None:
-  input_file: IO[bytes] = (
-    sys.stdin.buffer if args.input_file == "-" else open(args.input_file, 'rb')
-  )
-  output_file: IO[bytes] = (
-    sys.stdout.buffer if args.output_file == "-" else open(args.output_file, 'wb')
-  )
-
-  encrypted = input_file.read()
-  assert encrypted.startswith(CC_ENCRYPTION_MARKER_BYTES)
-  encrypted = encrypted[len(CC_ENCRYPTION_MARKER_BYTES):]
-  decrypted = CryptoJsBridge.decrypt(encrypted, CC_ENCRYPTION_PASSPHRASE)
-  output_file.write(decrypted)
-
-
-def cmd_pipe_encrypt(args: argparse.Namespace) -> None:
-  input_file: IO[bytes] = (
-    sys.stdin.buffer if args.input_file == "-" else open(args.input_file, 'rb')
-  )
-  output_file: IO[bytes] = (
-    sys.stdout.buffer if args.output_file == "-" else open(args.output_file, 'wb')
-  )
-
-  decrypted = input_file.read()
-  encrypted = CryptoJsBridge.encrypt(decrypted, CC_ENCRYPTION_PASSPHRASE)
-  output_file.write(CC_ENCRYPTION_MARKER_BYTES)
-  output_file.write(encrypted)
-
-
-class CryptoJsBridge:
-  """
-  Taken from <https://stackoverflow.com/a/36780727/12005228>.
-  Also see <https://mathstodon.xyz/@JordiGH/106196342434105054>.
-  """
-
-  BLOCK_SIZE = 16
-  SALTED_MARKER = b"Salted__"
-  SALT_SIZE = 8
-  KEY_SIZE = 32
-  IV_SIZE = 16
-
-  @classmethod
-  def pad(cls, data: bytes) -> bytes:
-    length = cls.BLOCK_SIZE - (len(data) % cls.BLOCK_SIZE)
-    return data + bytes([length]) * length
-
-  @classmethod
-  def unpad(cls, data: bytes) -> bytes:
-    return data[:-data[-1]]
-
-  @classmethod
-  def bytes_to_key(cls, data: bytes, salt: bytes, output: int) -> bytes:
-    """
-    Extended from <https://gist.github.com/gsakkis/4546068/1d65cea035562e36da2cc160d6a9e4821b553fa8#file-aes-py-L49-L57>.
-    """
-    assert len(salt) == cls.SALT_SIZE
-    data += salt
-    key = md5(data).digest()
-    final_key = key
-    while len(final_key) < output:
-      key = md5(key + data).digest()
-      final_key += key
-    return final_key[:output]
-
-  @classmethod
-  def encrypt(cls, message: bytes, passphrase: bytes) -> bytes:
-    """
-    Equivalent to `CryptoJS.AES.encrypt(message, passphrase).toString()`.
-    """
-    salt = Random.new().read(cls.SALT_SIZE)
-    key_iv = cls.bytes_to_key(passphrase, salt, cls.KEY_SIZE + cls.IV_SIZE)
-    key, iv = key_iv[:cls.KEY_SIZE], key_iv[cls.KEY_SIZE:]
-    aes = AES.new(key, AES.MODE_CBC, iv)
-    ciphertext = aes.encrypt(cls.pad(message))
-    return base64.b64encode(cls.SALTED_MARKER + salt + ciphertext)
-
-  @classmethod
-  def decrypt(cls, encrypted: bytes, passphrase: bytes) -> bytes:
-    """
-    Equivalent to `CryptoJS.AES.decrypt(encrypted, passphrase).toString(CryptoJS.enc.Utf8)`.
-    """
-    encrypted = base64.b64decode(encrypted)
-    assert encrypted.startswith(cls.SALTED_MARKER)
-    encrypted = encrypted[len(cls.SALTED_MARKER):]
-    salt, ciphertext = encrypted[:cls.SALT_SIZE], encrypted[cls.SALT_SIZE:]
-    key_iv = cls.bytes_to_key(passphrase, salt, cls.KEY_SIZE + cls.IV_SIZE)
-    key, iv = key_iv[:cls.KEY_SIZE], key_iv[cls.KEY_SIZE:]
-    aes = AES.new(key, AES.MODE_CBC, iv)
-    return cls.unpad(aes.decrypt(ciphertext))
-
-
-if __name__ == "__main__":
-  main()