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lbr77/crack.py

Created August 10, 2024 10:40
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Cracker for a specific software.
Raw
crack.py
import json
import hashlib
import os
license = {
"header": {"version": 1},
"payload": {
"name": "meow :3",
"email": "hi@hex-rays.com",
"licenses": [
{
"id": "48-2137-ACAB-99",
"license_type": "named",
"product": "IDA",
"seats": 1,
"start_date": "2024-08-10 00:00:00",
"end_date": "2033-12-31 23:59:59", # This can't be more than 10 years!
"issued_on": "2024-08-10 00:00:00",
"owner": "cracked by alula :3",
"add_ons": [
# {
# "id": "48-1337-DEAD-01",
# "code": "HEXX86L",
# "owner": "48-0000-0000-00",
# "start_date": "2024-08-10 00:00:00",
# "end_date": "2033-12-31 23:59:59",
# },
# {
# "id": "48-1337-DEAD-02",
# "code": "HEXX64L",
# "owner": "48-0000-0000-00",
# "start_date": "2024-08-10 00:00:00",
# "end_date": "2033-12-31 23:59:59",
# },
],
"features": [],
}
],
},
}
def add_every_addon(license):
platforms = [
"W", # Windows
"L", # Linux
"M", # macOS
]
addons = [
"HEXX86",
"HEXX64",
"HEXARM",
"HEXARM64",
"HEXMIPS",
"HEXMIPS64",
"HEXPPC",
"HEXPPC64",
"HEXRV64",
"HEXARC",
"HEXARC64",
# Probably cloud?
# "HEXCX86",
# "HEXCX64",
# "HEXCARM",
# "HEXCARM64",
# "HEXCMIPS",
# "HEXCMIPS64",
# "HEXCPPC",
# "HEXCPPC64",
# "HEXCRV",
# "HEXCRV64",
# "HEXCARC",
# "HEXCARC64",
]
i = 0
for addon in addons:
i += 1
license["payload"]["licenses"][0]["add_ons"].append(
{
"id": f"48-1337-DEAD-{i:02}",
"code": addon,
"owner": license["payload"]["licenses"][0]["id"],
"start_date": "2024-08-10 00:00:00",
"end_date": "2033-12-31 23:59:59",
}
)
# for addon in addons:
# for platform in platforms:
# i += 1
# license["payload"]["licenses"][0]["add_ons"].append(
# {
# "id": f"48-1337-DEAD-{i:02}",
# "code": addon + platform,
# "owner": license["payload"]["licenses"][0]["id"],
# "start_date": "2024-08-10 00:00:00",
# "end_date": "2033-12-31 23:59:59",
# }
# )
add_every_addon(license)
def json_stringify_alphabetical(obj):
return json.dumps(obj, sort_keys=True, separators=(",", ":"))
def buf_to_bigint(buf):
return int.from_bytes(buf, byteorder="little")
def bigint_to_buf(i):
return i.to_bytes((i.bit_length() + 7) // 8, byteorder="little")
# Yup, you only have to patch 5c -> cb in libida64.so
pub_modulus_hexrays = buf_to_bigint(
bytes.fromhex(
"edfd425cf978546e8911225884436c57140525650bcf6ebfe80edbc5fb1de68f4c66c29cb22eb668788afcb0abbb718044584b810f8970cddf227385f75d5dddd91d4f18937a08aa83b28c49d12dc92e7505bb38809e91bd0fbd2f2e6ab1d2e33c0c55d5bddd478ee8bf845fcef3c82b9d2929ecb71f4d1b3db96e3a8e7aaf93"
)
)
pub_modulus_patched = buf_to_bigint(
bytes.fromhex(
"edfd42cbf978546e8911225884436c57140525650bcf6ebfe80edbc5fb1de68f4c66c29cb22eb668788afcb0abbb718044584b810f8970cddf227385f75d5dddd91d4f18937a08aa83b28c49d12dc92e7505bb38809e91bd0fbd2f2e6ab1d2e33c0c55d5bddd478ee8bf845fcef3c82b9d2929ecb71f4d1b3db96e3a8e7aaf93"
)
)
private_key = buf_to_bigint(
bytes.fromhex(
"77c86abbb7f3bb134436797b68ff47beb1a5457816608dbfb72641814dd464dd640d711d5732d3017a1c4e63d835822f00a4eab619a2c4791cf33f9f57f9c2ae4d9eed9981e79ac9b8f8a411f68f25b9f0c05d04d11e22a3a0d8d4672b56a61f1532282ff4e4e74759e832b70e98b9d102d07e9fb9ba8d15810b144970029874"
)
)
def decrypt(message):
decrypted = pow(buf_to_bigint(message), exponent, pub_modulus_patched)
decrypted = bigint_to_buf(decrypted)
return decrypted[::-1]
def encrypt(message):
encrypted = pow(buf_to_bigint(message[::-1]), private_key, pub_modulus_patched)
encrypted = bigint_to_buf(encrypted)
return encrypted
exponent = 0x13
def sign_hexlic(payload: dict) -> str:
data = {"payload": payload}
data_str = json_stringify_alphabetical(data)
buffer = bytearray(128)
# first 33 bytes are random
for i in range(33):
buffer[i] = 0x42
# compute sha256 of the data
sha256 = hashlib.sha256()
sha256.update(data_str.encode())
digest = sha256.digest()
# copy the sha256 digest to the buffer
for i in range(32):
buffer[33 + i] = digest[i]
# encrypt the buffer
encrypted = encrypt(buffer)
return encrypted.hex().upper()
def generate_patched_dll(filename):
if not os.path.exists(filename):
print(f"Didn't find {filename}, skipping patch generation")
return
with open(filename, "rb") as f:
data = f.read()
if data.find(bytes.fromhex("EDFD42CBF978")) != -1:
print(f"{filename} looks to be already patched :)")
return
if data.find(bytes.fromhex("EDFD425CF978")) == -1:
print(f"{filename} doesn't contain the original modulus.")
return
data = data.replace(
bytes.fromhex("EDFD425CF978"), bytes.fromhex("EDFD42CBF978")
)
patched_filename = f"{filename}.patched"
with open(patched_filename, "wb") as f:
f.write(data)
print(f"Generated modulus patch to {patched_filename}! To apply the patch, replace the original file with the patched file")
# message = bytes.fromhex(license["signature"])
# print(decrypt(message).hex())
# print(encrypt(decrypt(message)).hex())
license["signature"] = sign_hexlic(license["payload"])
serialized = json_stringify_alphabetical(license)
# write to ida.hexlic
filename = "ida.hexlic"
with open(filename, "w") as f:
f.write(serialized)
print(f"Saved new license to {filename}!")
generate_patched_dll("ida.dll")
generate_patched_dll("ida64.dll")
generate_patched_dll("libida.so")
generate_patched_dll("libida64.so")
generate_patched_dll("libida.dylib")
generate_patched_dll("libida64.dylib")
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