feat(sandbox): add Python 3 code execution sandbox support

sandbox/app/core/encryption.py

@@ -0,0 +1,32 @@
+"""Code encryption utilities"""
+import base64
+
+
+def encrypt_code(code: bytes, key: bytes) -> str:
+    """Encrypt code using XOR cipher with base64 encoding
+    
+    Args:
+        code: Plain code string
+        key: Encryption key bytes
+        
+    Returns:
+        Base64 encoded encrypted code
+    """
+    encrypted_code = bytearray(len(code))
+    for i in range(len(code)):
+        encrypted_code[i] = code[i] ^ key[i % 64]
+    encoded_code = base64.b64encode(encrypted_code).decode("utf-8")
+    return encoded_code
+
+
+def generate_key(length: int = 64) -> bytes:
+    """Generate random encryption key
+    
+    Args:
+        length: Key length in bytes (default 64 for 512 bits)
+        
+    Returns:
+        Random key bytes
+    """
+    import secrets
+    return secrets.token_bytes(length)