# 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
import base64 import gzip from Crypto.Cipher import AES from Crypto.Util.Padding import unpad def decrypt_hc_exclusive(input_file, output_file, key, iv): # Read the Base64 encoded exclusive content with open(input_file, 'r') as f: b64_data = f.read().strip() how to decrypt http custom file exclusive
# Attempt to decrypt as if it's OpenSSL salted AES-256-CBC openssl enc -d -aes-256-cbc -base64 -in exclusive.hc -out decrypted.gz -pass pass:httpcustomkey gunzip decrypted.gz # If the file has 'Salted__' header, extract
For the average user, attempting to decrypt an exclusive file is not recommended unless you are the file owner or have explicit permission. Instead, request an unencrypted version from the creator. Check the APK's source for IvParameterSpec
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.