--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/modes/xts/xts_init.c	Sat Jun 24 17:50:50 2017 +0800
@@ -0,0 +1,69 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtom.org
+ */
+#include "tomcrypt.h"
+
+/** 
+  Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
+*/
+
+#ifdef LTC_XTS_MODE
+
+
+/** Start XTS mode
+   @param cipher      The index of the cipher to use
+   @param key1        The encrypt key
+   @param key2        The tweak encrypt key
+   @param keylen      The length of the keys (each) in octets
+   @param num_rounds  The number of rounds for the cipher (0 == default)
+   @param xts         [out] XTS structure
+   Returns CRYPT_OK upon success.
+*/
+int xts_start(                int  cipher,
+              const unsigned char *key1, 
+              const unsigned char *key2, 
+                    unsigned long  keylen,
+                              int  num_rounds, 
+                    symmetric_xts *xts)
+{
+   int err;
+
+   /* check inputs */
+   LTC_ARGCHK(key1  != NULL);
+   LTC_ARGCHK(key2  != NULL);
+   LTC_ARGCHK(xts   != NULL);
+
+   /* check if valid */
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (cipher_descriptor[cipher].block_length != 16) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* schedule the two ciphers */
+   if ((err = cipher_descriptor[cipher].setup(key1, keylen, num_rounds, &xts->key1)) != CRYPT_OK) {
+      return err;
+   }
+   if ((err = cipher_descriptor[cipher].setup(key2, keylen, num_rounds, &xts->key2)) != CRYPT_OK) {
+      return err;
+   }
+   xts->cipher = cipher;
+
+   return err;
+}
+
+#endif
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */
+