Add existing GAM 3.21 code

gdata/tlslite/utils/PyCrypto_TripleDES.py

@@ -0,0 +1,22 @@
+"""PyCrypto 3DES implementation."""
+
+from cryptomath import *
+from TripleDES import *
+
+if pycryptoLoaded:
+    import Crypto.Cipher.DES3
+
+    def new(key, mode, IV):
+        return PyCrypto_TripleDES(key, mode, IV)
+
+    class PyCrypto_TripleDES(TripleDES):
+
+        def __init__(self, key, mode, IV):
+            TripleDES.__init__(self, key, mode, IV, "pycrypto")
+            self.context = Crypto.Cipher.DES3.new(key, mode, IV)
+
+        def encrypt(self, plaintext):
+            return self.context.encrypt(plaintext)
+
+        def decrypt(self, ciphertext):
+            return self.context.decrypt(ciphertext)