Add files via upload

prxtractor.py

@@ -0,0 +1,91 @@
+import re
+import sys
+import os
+from Crypto.Cipher import AES
+from hashlib import md5
+
+def strings_dump(filepath, min_len=6):
+    with open(filepath, "rb") as f:
+        data = f.read()
+    pattern = rb'[\x20-\x7E]{' + str(min_len).encode() + rb',}'
+    return data, [m.group().decode("ascii") for m in re.finditer(pattern, data)]
+
+def find_playready_phrases(filepath):
+    data, hits = strings_dump(filepath, min_len=6)
+
+    known_hints = ["pszBasePhrase", "pszAdditionalPhrase", "pszPhrase", "Salted__"]
+    print("[*] Known marker strings found:")
+    for h in hits:
+        if any(hint.lower() in h.lower() for hint in known_hints):
+            print(f"  [hint] {h}")
+
+    print("\n[*] Potential base+additional passphrase pairs:")
+    passphrase = None
+    concat_pattern = rb'([\x20-\x7E]{6,24})\x00+([\x20-\x7E]{6,24})'
+    for m in re.finditer(concat_pattern, data):
+        a, b = m.group(1).decode(), m.group(2).decode()
+        if re.match(r'^[A-Za-z0-9]{6,24}$', a) and re.match(r'^[A-Za-z0-9]{6,24}$', b):
+            if not passphrase:
+                passphrase = a + b
+            print(f"  '{a}' + '{b}' => '{a+b}'")
+    if not passphrase:
+        print("  None found.")
+    
+    return passphrase
+
+def openssl_kdf(passphrase: str, salt: bytes):
+    data = passphrase.encode()
+    d, d_i = b"", b""
+    while len(d) < 48:
+        d_i = md5(d_i + data + salt).digest()
+        d += d_i
+    return d[:32], d[32:48]
+
+def decrypt_dat(dat_path: str, passphrase: str, strip_padding: bool = False):
+    with open(dat_path, "rb") as f:
+        raw = f.read()
+
+    if raw[:8] != b"Salted__":
+        print(f"  [!] {dat_path} does not have OpenSSL Salted__ header — skipping")
+        return None
+
+    salt = raw[8:16]
+    ciphertext = raw[16:]
+
+    key, iv = openssl_kdf(passphrase, salt)
+    cipher = AES.new(key, AES.MODE_CBC, iv)
+    decrypted = cipher.decrypt(ciphertext)
+
+    if strip_padding:
+        decrypted = decrypted[:-8]
+        print(f"  [*] Stripped last 8 bytes (zgpriv padding)")
+
+    pad_len = decrypted[-1]
+    if 1 <= pad_len <= 16:
+        decrypted = decrypted[:-pad_len]
+
+    out_path = dat_path.replace(".dat", "_decrypted.bin")
+    with open(out_path, "wb") as f:
+        f.write(decrypted)
+    print(f"  [+] Decrypted -> {out_path} ({len(decrypted)} bytes)")
+    return out_path
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: prxtractor.py <libplayready.so.0> [bgroupcert.dat] [zgpriv.dat]")
+        sys.exit(1)
+
+    so_path = sys.argv[1]
+    bgroupcert_path = sys.argv[2] if len(sys.argv) > 2 else None
+    zgpriv_path = sys.argv[3] if len(sys.argv) > 3 else None
+
+    print(f"[*] Scanning {so_path}...\n")
+    passphrase = find_playready_phrases(so_path)
+
+    if passphrase and bgroupcert_path:
+        print(f"\n[*] Decrypting {bgroupcert_path}...")
+        decrypt_dat(bgroupcert_path, passphrase, strip_padding=False)
+
+    if passphrase and zgpriv_path:
+        print(f"\n[*] Decrypting {zgpriv_path}...")
+        decrypt_dat(zgpriv_path, passphrase, strip_padding=True)