1 files changed, 66 insertions, 0 deletions

diff --git a/g4f/Provider/openai/crypt.py b/g4f/Provider/openai/crypt.py
new file mode 100644
index 00000000..e7f35190
--- /dev/null
+++ b/g4f/Provider/openai/crypt.py
@@ -0,0 +1,66 @@
+import json
+import base64
+import hashlib
+import random
+from Crypto.Cipher import AES
+
+def pad(data: str) -> bytes:
+    # Convert the string to bytes and calculate the number of bytes to pad
+    data_bytes = data.encode()
+    padding = 16 - (len(data_bytes) % 16)
+    # Append the padding bytes with their value
+    return data_bytes + bytes([padding] * padding)
+
+def encrypt(data, key):
+    salt = ""
+    salted = ""
+    dx = bytes()
+
+    # Generate salt, as 8 random lowercase letters
+    salt = "".join(random.choice("abcdefghijklmnopqrstuvwxyz") for _ in range(8))
+
+    # Our final key and IV come from the key and salt being repeatedly hashed
+    for x in range(3):
+        dx = hashlib.md5(dx + key.encode() + salt.encode()).digest()
+        salted += dx.hex()
+
+    # Pad the data before encryption
+    data = pad(data)
+
+    aes = AES.new(
+        bytes.fromhex(salted[:64]), AES.MODE_CBC, bytes.fromhex(salted[64:96])
+    )
+
+    return json.dumps(
+        {
+            "ct": base64.b64encode(aes.encrypt(data)).decode(),
+            "iv": salted[64:96],
+            "s": salt.encode().hex(),
+        }
+    )
+
+def unpad(data: bytes) -> bytes:
+    # Extract the padding value from the last byte and remove padding
+    padding_value = data[-1]
+    return data[:-padding_value]
+
+def decrypt(data: str, key: str):
+    # Parse JSON data
+    parsed_data = json.loads(base64.b64decode(data))
+    ct = base64.b64decode(parsed_data["ct"])
+    iv = bytes.fromhex(parsed_data["iv"])
+    salt = bytes.fromhex(parsed_data["s"])
+
+    salted = ''
+    dx = b''
+    for x in range(3):
+        dx = hashlib.md5(dx + key.encode() + salt).digest()
+        salted += dx.hex()
+        
+    aes = AES.new(
+        bytes.fromhex(salted[:64]), AES.MODE_CBC, iv
+    )
+
+    data = aes.decrypt(ct)
+    if data.startswith(b'[{"key":'):
+        return unpad(data).decode()
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