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December 14, 2024 04:51
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Save flatz/3f242ab3c550d361f8c6d031b07fb6b1 to your computer and use it in GitHub Desktop.
Gets decrypted key from latest Signal desktop app to use with sigtop
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#!/usr/bin/env python3 | |
import os | |
import json | |
from Crypto.Protocol.KDF import PBKDF2 | |
from Crypto.Hash import SHA1 | |
from Crypto.Cipher import AES | |
from Crypto.Util.Padding import unpad | |
def aes_decrypt_cbc(key, iv, data): | |
cipher = AES.new(key, AES.MODE_CBC, iv) | |
return cipher.decrypt(data) | |
password = <PUT HERE YOUR PASSWORD FROM KEYCHAIN> | |
prefix = b'v10' | |
salt = 'saltysalt' | |
derived_key_len = 128 // 8 | |
num_iterations = 1003 | |
iv = b' ' * 16 | |
config_file_path = '~/Library/Application Support/Signal/config.json' | |
with open(os.path.expanduser(config_file_path), 'r') as f: | |
config = json.loads(f.read()) | |
encrypted_key = bytes.fromhex(config['encryptedKey']) | |
assert encrypted_key.startswith(prefix) | |
encrypted_key = encrypted_key[len(prefix):] | |
kek = PBKDF2(password, salt, dkLen = derived_key_len, count = num_iterations, hmac_hash_module = SHA1) | |
decrypted_key = unpad(aes_decrypt_cbc(kek, iv, encrypted_key), block_size = 16).decode('ascii') | |
print('0x' + decrypted_key) |
im getting this error ValueError: Data must be padded to 16 byte boundary in CBC mode
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The current version unfortunately only with v10 encrypted key, not with v11 which at least Signal Desktop for Linux uses.