# Write the plaintext JSON config with open(output_file, 'w') as f: f.write(decompressed.decode('utf-8'))
The IV (Initialization Vector) may be static (e.g., all zeros) or prepended to the ciphertext. Check the APK's source for IvParameterSpec . Step 4: The OpenSSL Fallback Method If HTTP Custom uses OpenSSL's EVP_BytesToKey (common in older versions), you can use OpenSSL command line directly.
# If the file has 'Salted__' header, extract salt and use custom KDF if ciphertext[:8] == b'Salted__': salt = ciphertext[8:16] # You'd need to re-derive key using EVP_BytesToKey (OpenSSL) # Skipping for brevity - see step 4 for OpenSSL method how to decrypt http custom file exclusive
However, for security researchers and developers, understanding this process helps improve the robustness of your own configuration protection mechanisms.
This article is provided for educational and informational purposes only. Decrypting configuration files without the author's permission may violate the Terms of Service of the application or the proxy provider. Always ensure you have the legal right to modify or reverse-engineer a file before proceeding. How to Decrypt HTTP Custom File Exclusive: The Complete Technical Guide Introduction HTTP Custom is one of the most powerful tools for tunneling, SSH, VPN, and custom proxy configurations on Android devices. Users frequently encounter files with the .hc extension—colloquially known as "HTTP Custom files." These files allow users to import pre-configured settings for SSH, SSL, WebSocket, or payload injections. # Write the plaintext JSON config with open(output_file,
# The decrypted data is usually GZIP compressed try: decompressed = gzip.decompress(decrypted) except: decompressed = decrypted # not compressed
print(f"Decryption successful. Output: output_file") decrypt_hc_exclusive("exclusive_config.hc", "decrypted_config.json", key="16bytekey123456", iv="16byteiv12345678") # If the file has 'Salted__' header, extract
# Decode from Base64 ciphertext = base64.b64decode(b64_data)