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Txt_Steg/docx_steg.py

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+import numpy as np
+from pprint import pprint
+
+
+class docx_steg:
+    def __init__(self, docx_file: str = "testfile.docx", bits_to_hide: list[int] = None) -> None:
+        """
+        Initialize the class
+        :param docx_file: PathName of the docx file to encode or decode
+        :type docx_file: str
+        :param bits_to_hide: Bit to hide the data in (1 - LSB to 8 - MSB)
+        :type bits_to_hide: list[int]
+        """
+        self.docx_file = docx_file
+        self.bits_to_hide = [8 - bit_pos for bit_pos in bits_to_hide] if bits_to_hide else [1]  # Default is LSB
+        self.delimiter = "====="  # Delimiter to indicate the end of the secret data
+
+    def encode(self, secret_data: str = "Hello World") -> bytes:
+        """
+        Encode the secret data into the docx file
+
+        :param secret_data: String of data to hide
+
+        :return: Encoded docx file as bytes
+        :rtype: bytes
+        """
+
+        with open(self.docx_file, "rb") as f:
+            data = f.read()
+
+        # Max Bytes to encode
+        n_bytes = len(data) // 8
+
+        # Check if secret data can be encoded into docx file
+        # print(f"Secret data length: {len(secret_data)}, Max data length: {n_bytes}")
+        if len(secret_data) > n_bytes:
+            raise ValueError(
+                f"[-] Error: Binary Secret data length {len(secret_data)} is greater than data length {n_bytes}")
+
+        # Convert secret data to binary
+        binary_secret_data = self.to_bin(secret_data)
+
+        # Add delimiter
+        binary_secret_data += self.to_bin(self.delimiter)
+
+        data_index = 0
+        encoded_data = bytearray()
+
+        print(f"[+] Starting encoding...")
+        # Encode data into docx
+        for byte in data:
+            if data_index >= len(binary_secret_data):
+                encoded_data.append(byte)
+            else:
+                for bit_pos in self.bits_to_hide:
+                    if data_index < len(binary_secret_data):
+                        byte = list(format(byte, "08b"))
+                        byte = list(byte)
+                        byte[bit_pos] = binary_secret_data[data_index]
+                        data_index += 1
+                        # Convert byte back to int
+                        byte = int("".join(byte), 2)
+                encoded_data.append(byte)
+
+        print(f"[+] Encoding completed successfully.")
+        return bytes(encoded_data)
+
+    def decode(self) -> str:
+        """
+        Decode the secret data from the docx file
+        :return: Decoded secret data
+        :rtype: str
+        """
+        with open(self.docx_file, "rb") as f:
+            data = f.read()
+
+        binary_data = ""
+        print(f"[+] Starting decoding...")
+        for byte in data:
+            # Add byte to binary data
+            # Convert byte from int to binary string
+            byte = format(byte, "08b")
+            # Pad byte with 0's to make sure it has 8 bits
+            byte = "0" * (8 - len(byte)) + byte
+            for bit_pos in self.bits_to_hide:
+                binary_data += byte[bit_pos]
+
+        all_bytes = [binary_data[i: i + 8] for i in range(0, len(binary_data), 8)]
+
+        decoded_data = ""
+        for byte in all_bytes:
+            decoded_data += chr(int(byte, 2))
+            if decoded_data[-len(self.delimiter):] == self.delimiter:
+                break
+
+        print(f"[+] Decoding completed successfully.")
+        # Return the decoded data
+        return decoded_data[:-len(self.delimiter)]
+
+    def to_bin(self, data: str) -> str | list[str]:
+        """
+        Convert text file data to binary format as string
+        :param data: String
+        :type data: str
+        :return: Binary Data: String | List[String]
+        """
+
+        if isinstance(data, str):
+            return ''.join([format(ord(i), "08b") for i in data])
+        elif isinstance(data, bytes) or isinstance(data, np.ndarray):
+            return [format(i, "08b") for i in data]
+        elif isinstance(data, int) or isinstance(data, np.unit8):
+            return format(data, "08b")
+        else:
+            raise TypeError("Type not supported")
+
+    def from_bin(self, data: str) -> str:
+        """
+        Convert binary `data` back to the original format
+        :param data: String
+        :type data: str
+        :return: Original Data: String
+        """
+
+        return ''.join([chr(int(data[i:i + 8], 2)) for i in range(0, len(data), 8)])
+
+
+if __name__ == "__main__":
+    with open("secret_data.txt", "r") as f:
+        secret_data = f.read()
+
+    bits_to_hide = np.random.choice(range(1, 9), np.random.randint(1, 9), replace=False)
+    bits_to_hide = list(bits_to_hide)
+    bits_to_hide.sort()
+    # bits_to_hide = [1]
+    print(f"Bits to hide: {bits_to_hide}")
+
+    docx_file = "testfile.docx"
+    output_encoded_docx = "encoded_document.docx"
+
+
+    # Encode data, get as bytes
+    encoded_data = docx_steg(docx_file=docx_file, bits_to_hide=bits_to_hide).encode(secret_data=secret_data)
+
+    # Write encoded data to file
+    with open(output_encoded_docx, "wb") as f:
+        f.write(encoded_data)
+
+    # Decode data from encoded docx file
+    decoded_data = docx_steg(docx_file=output_encoded_docx, bits_to_hide=bits_to_hide).decode()
+
+    # Print the decoded data
+    print("[+] Decoded data:", decoded_data)