Dump libssl bindings in favour of the new optional cryptg module

telethon/crypto/aes.py

@@ -3,86 +3,90 @@ AES IGE implementation in Python. This module may use libssl if available.
 """
 import os
 import pyaes
-from . import libssl
+
+try:
+    import cryptg
+except ImportError:
+    cryptg = None
 
 
-if libssl.AES is not None:
-    # Use libssl if available, since it will be faster
-    AES = libssl.AES
-else:
-    # Fallback to a pure Python implementation
-    class AES:
+class AES:
+    """
+    Class that servers as an interface to encrypt and decrypt
+    text through the AES IGE mode.
+    """
+    @staticmethod
+    def decrypt_ige(cipher_text, key, iv):
         """
-        Class that servers as an interface to encrypt and decrypt
-        text through the AES IGE mode.
+        Decrypts the given text in 16-bytes blocks by using the
+        given key and 32-bytes initialization vector.
         """
-        @staticmethod
-        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.
-            """
-            iv1 = iv[:len(iv) // 2]
-            iv2 = iv[len(iv) // 2:]
+        if cryptg:
+            return cryptg.decrypt_ige(cipher_text, key, iv)
 
-            aes = pyaes.AES(key)
+        iv1 = iv[:len(iv) // 2]
+        iv2 = iv[len(iv) // 2:]
 
-            plain_text = []
-            blocks_count = len(cipher_text) // 16
+        aes = pyaes.AES(key)
 
-            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 = []
+        blocks_count = len(cipher_text) // 16
 
-                plain_text_block = aes.decrypt(cipher_text_block)
+        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]
 
-                for i in range(16):
-                    plain_text_block[i] ^= iv1[i]
+            plain_text_block = aes.decrypt(cipher_text_block)
 
-                iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
-                iv2 = plain_text_block
+            for i in range(16):
+                plain_text_block[i] ^= iv1[i]
 
-                plain_text.extend(plain_text_block)
+            iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
+            iv2 = plain_text_block
 
-            return bytes(plain_text)
+            plain_text.extend(plain_text_block)
 
-        @staticmethod
-        def encrypt_ige(plain_text, key, iv):
-            """
-            Encrypts the given text in 16-bytes blocks by using the
-            given key and 32-bytes initialization vector.
-            """
+        return bytes(plain_text)
 
-            # Add random padding iff it's not evenly divisible by 16 already
-            if len(plain_text) % 16 != 0:
-                padding_count = 16 - len(plain_text) % 16
-                plain_text += os.urandom(padding_count)
+    @staticmethod
+    def encrypt_ige(plain_text, key, iv):
+        """
+        Encrypts the given text in 16-bytes blocks by using the
+        given key and 32-bytes initialization vector.
+        """
+        # Add random padding iff it's not evenly divisible by 16 already
+        if len(plain_text) % 16 != 0:
+            padding_count = 16 - len(plain_text) % 16
+            plain_text += os.urandom(padding_count)
 
-            iv1 = iv[:len(iv) // 2]
-            iv2 = iv[len(iv) // 2:]
+        if cryptg:
+            return cryptg.encrypt_ige(plain_text, key, iv)
 
-            aes = pyaes.AES(key)
+        iv1 = iv[:len(iv) // 2]
+        iv2 = iv[len(iv) // 2:]
 
-            cipher_text = []
-            blocks_count = len(plain_text) // 16
+        aes = pyaes.AES(key)
 
-            for block_index in range(blocks_count):
-                plain_text_block = list(
-                    plain_text[block_index * 16:block_index * 16 + 16]
-                )
-                for i in range(16):
-                    plain_text_block[i] ^= iv1[i]
+        cipher_text = []
+        blocks_count = len(plain_text) // 16
 
-                cipher_text_block = aes.encrypt(plain_text_block)
+        for block_index in range(blocks_count):
+            plain_text_block = list(
+                plain_text[block_index * 16:block_index * 16 + 16]
+            )
+            for i in range(16):
+                plain_text_block[i] ^= iv1[i]
 
-                for i in range(16):
-                    cipher_text_block[i] ^= iv2[i]
+            cipher_text_block = aes.encrypt(plain_text_block)
 
-                iv1 = cipher_text_block
-                iv2 = plain_text[block_index * 16:block_index * 16 + 16]
+            for i in range(16):
+                cipher_text_block[i] ^= iv2[i]
 
-                cipher_text.extend(cipher_text_block)
+            iv1 = cipher_text_block
+            iv2 = plain_text[block_index * 16:block_index * 16 + 16]
 
-            return bytes(cipher_text)
+            cipher_text.extend(cipher_text_block)
+
+        return bytes(cipher_text)