def decrypt_ige(cipher_text, key, iv):
"""
Decrypts the given text in 16-bytes blocks by using the
given key and 32-bytes initialization vector.
"""
if cryptg:
return cryptg.decrypt_ige(cipher_text, key, iv)
iv1 = iv[:len(iv) // 2]
iv2 = iv[len(iv) // 2:]
aes = pyaes.AES(key)
plain_text = []
blocks_count = len(cipher_text) // 16
cipher_text_block = [0] * 16
for block_index in range(blocks_count):
for i in range(16):
cipher_text_block[i] = \
cipher_text[block_index * 16 + i] ^ iv2[i]
plain_text_block = aes.decrypt(cipher_text_block)
for i in range(16):
plain_text_block[i] ^= iv1[i]
iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
iv2 = plain_text_block
plain_text.extend(plain_text_block)
return bytes(plain_text)
def decrypt_ige(cipher_text, key, iv):
"""
Decrypts the given text in 16-bytes blocks by using the
given key and 32-bytes initialization vector.
"""
if cryptg:
return cryptg.decrypt_ige(cipher_text, key, iv)
if libssl.decrypt_ige:
return libssl.decrypt_ige(cipher_text, key, iv)
iv1 = iv[:len(iv) // 2]
iv2 = iv[len(iv) // 2:]
aes = pyaes.AES(key)
plain_text = []
blocks_count = len(cipher_text) // 16
cipher_text_block = [0] * 16
for block_index in range(blocks_count):
for i in range(16):
cipher_text_block[i] = \
cipher_text[block_index * 16 + i] ^ iv2[i]
plain_text_block = aes.decrypt(cipher_text_block)
for i in range(16):
plain_text_block[i] ^= iv1[i]
iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
iv2 = plain_text_block
plain_text.extend(plain_text_block)
return bytes(plain_text)
def generate_Localkey(LocalKey_Block, BaseKey):
print("\n[+] ======= Generate LocalKey =======\n")
Localkey_dec_key = load_dec_key(LocalKey_Block)
print("[DEC_KEY] " + Localkey_dec_key.hex())
print("")
AES_KEY, AES_IV = prepare_AES(Localkey_dec_key, BaseKey)
enc_LocalKey = LocalKey_Block[0x10:]
LocalKey = cryptg.decrypt_ige(enc_LocalKey, AES_KEY, AES_IV)
print("[LOCALKEY]")
print(LocalKey.hex())
open(o_Localkey_file, "wb").write(LocalKey)
def generate_AuthKey(path):
if os.path.exists(o_Localkey_file) and os.stat(o_Localkey_file).st_size:
print("\n[+] ======= Generate AuthKey =======\n")
LocalKey = open(o_Localkey_file, "rb").read()[0x04:]
AuthKey_file = open(path, "rb").read()
cur = 0x00
header = AuthKey_file[cur:cur + 4]
print("[HEADER] " + header.decode("utf-8"))
print("")
cur += 0x04
version = AuthKey_file[cur:cur + 4]
print("[VERSION] " + version.hex())
print("")
cur += 0x04
AuthKey_Block_len = int.from_bytes(AuthKey_file[cur:cur + 4], 'big')
print("[AUTHKEY_BLOCK_LEN] " + hex(AuthKey_Block_len))
print("")
cur += 0x04
AuthKey_block = AuthKey_file[cur:cur + AuthKey_Block_len]
AuthKey_dec_key = load_dec_key(AuthKey_block)
print("[DEC_KEY] " + AuthKey_dec_key.hex())
print("")
AES_KEY, AES_IV = prepare_AES(AuthKey_dec_key, LocalKey)
enc_AuthKey = AuthKey_block[0x10:]
AuthKey = cryptg.decrypt_ige(enc_AuthKey, AES_KEY, AES_IV)
print("[AUTHKEY]")
print(AuthKey.hex())
open(o_AuthKey_file, "wb").write(AuthKey)
else:
print("[!] LOCALKEY NOT FOUND")