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自己瞎写的一款加密、解密算法，算是瞎写着玩。

class ATOM128:
    encode_table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
    decode_table = {v: k for k, v in enumerate(encode_table)}

    @staticmethod
    def atom_encode(data, shift=1, salt="1234"):
        # Add salt to data
        salted_data = salt + data
        # Convert data to UTF-8 byte stream
        binary_data = ''.join([format(byte, '08b') for byte in salted_data.encode('utf-8')])
        padding_len = (6 - len(binary_data) % 6) % 6
        binary_data += '0' * padding_len

        encoded_data = ''
        for i in range(0, len(binary_data), 6):
            chunk = binary_data[i:i + 6]
            index = int(chunk, 2)
            index = (index + shift) % 64
            encoded_data += ATOM128.encode_table[index]

        padding_chars = '=' * (padding_len // 2)
        return encoded_data + padding_chars

    @staticmethod
    def atom_decode(encoded_data, shift=1, salt_length=4):
        try:
            padding_count = encoded_data.count('=')
            encoded_data = encoded_data.rstrip('=')

            binary_data = ''
            for char in encoded_data:
                index = (ATOM128.decode_table[char] - shift + 64) % 64
                binary_data += format(index, '06b')

            binary_data = binary_data[:len(binary_data) - padding_count * 2]

            # Convert binary data back to byte stream
            bytes_data = []
            for i in range(0, len(binary_data), 8):
                byte = binary_data[i:i + 8]
                bytes_data.append(int(byte, 2))

            # Decode byte stream to UTF-8 string
            decoded_string = bytes(bytes_data).decode('utf-8')

            # Remove salt
            return decoded_string[salt_length:]
        except Exception as e:
            return "Error: Decoding failed. The input is not valid ATOM-128 encoded data. Please try again! {}".format(e)

# Example Usage:
encoded = ATOM128.atom_encode("ABC从", shift=3, salt="ab啊cd")
decoded = ATOM128.atom_decode(encoded, shift=3, salt_length=5)  # 注意salt_length表示上方加密salt值的长度

print("Encoded:", encoded)
print("Decoded:", decoded)