Contract con_otp_v1

  

    

      

        

            
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# con_otp_v1
          

            
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random.seed()
          

            
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def encrypt_int(message: int, otp: int, safe: bool = True) -> int:
          

            
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    assert message >= 0, "Only non-negative numbers are supported"
          

            
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    assert not safe or message <= otp, "The message %i is too long" % (message)
          

            
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    return message ^ otp
          

            
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def bit_size(num: int) -> int:
          

            
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    assert isinstance(num, int), "bit_size(num) only supports integers, not %r" % type(num)
          

            
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    return num.bit_length()
          

            
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def byte_size(number: int) -> int:
          

            
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    if number == 0:
          

            
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        return 1
          

            
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    return div_ceil(bit_size(number), 8)
          

            
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def int2bytes(number: int, fill_size: int = 0) -> bytes:
          

            
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    assert number >= 0, "Number must be an unsigned integer: %d" % number
          

            
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    bytes_required = max(1, div_ceil(number.bit_length(), 8))
          

            
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    if fill_size > 0:
          

            
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        return number.to_bytes(fill_size, "big")
          

            
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    return number.to_bytes(bytes_required, "big")
          

            
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def bytes2int(raw_bytes: bytes) -> int:
          

            
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    return int.from_bytes(raw_bytes, "big", signed=False)
          

            
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def div_ceil(a: int, b: int) -> int:
          

            
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    return a//b + bool(a%b)
          

            
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@export
          

            
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def encrypt(message_str: str, otp: int, safe: bool = True) -> str:
          

            
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    message_bytes = message_str.encode()
          

            
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    message_int = bytes2int(message_bytes)
          

            
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    key_length = max(byte_size(otp), len(message_bytes))
          

            
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    encrypted_int = encrypt_int(message_int, otp, safe=safe)
          

            
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    encrypted_bytes = int2bytes(encrypted_int, key_length)
          

            
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    return encrypted_bytes.hex()
          

            
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@export
          

            
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def encrypt_hex(message_str: str, otp: int, safe: bool = True) -> str:
          

            
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    message_bytes = bytes.fromhex(message_str)
          

            
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    message_int = bytes2int(message_bytes)
          

            
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    key_length = max(byte_size(otp), len(message_bytes))
          

            
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    encrypted_int = encrypt_int(message_int, otp, safe=safe)
          

            
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    encrypted_bytes = int2bytes(encrypted_int, key_length)
          

            
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    return encrypted_bytes.hex()
          

            
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@export
          

            
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def decrypt(encrypted_str: str, otp: int, safe: bool = True) -> str:
          

            
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    encrypted_bytes = bytes.fromhex(encrypted_str)
          

            
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    encrypted_int = bytes2int(encrypted_bytes)
          

            
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    key_length = max(byte_size(otp), len(encrypted_bytes))
          

            
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    decrypted_int = encrypt_int(otp, encrypted_int, safe=safe)
          

            
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    decrypted_bytes = int2bytes(decrypted_int, key_length)
          

            
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    return decrypted_bytes.lstrip(b'\x00').decode()
          

            
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@export
          

            
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def decrypt_hex(encrypted_str: str, otp: int, safe: bool = True) -> str:
          

            
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    encrypted_bytes = bytes.fromhex(encrypted_str)
          

            
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    encrypted_int = bytes2int(encrypted_bytes)
          

            
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    key_length = max(byte_size(otp), len(encrypted_bytes))
          

            
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    decrypted_int = encrypt_int(otp, encrypted_int, safe=safe)
          

            
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    decrypted_bytes = int2bytes(decrypted_int, key_length)
          

            
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    return decrypted_bytes.hex()
          

            
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@export
          

            
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def generate_otp(n_bits: int) -> int:
          

            
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    return random.getrandbits(n_bits)
          

            
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@construct
          

            
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def seed():
          

            
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    pass    
          
      
    
  
  

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