1 files changed, 68 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/modes/xts/xts_mult_x.c b/core/lib/libtomcrypt/src/modes/xts/xts_mult_x.c
new file mode 100644
index 0000000..1c3478b
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+++ b/core/lib/libtomcrypt/src/modes/xts/xts_mult_x.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2001-2007, Tom St Denis
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* 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, tomstdenis@gmail.com, http://libtom.org
+ */
+#include "tomcrypt.h"
+
+/** 
+  Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
+*/
+
+#ifdef LTC_XTS_MODE
+
+/** multiply by x 
+  @param I      The value to multiply by x (LFSR shift)
+*/
+void xts_mult_x(unsigned char *I)
+{
+  int x;
+  unsigned char t, tt;
+
+  for (x = t = 0; x < 16; x++) {
+     tt   = I[x] >> 7;
+     I[x] = ((I[x] << 1) | t) & 0xFF;
+     t    = tt;
+  }
+  if (tt) {
+     I[0] ^= 0x87;
+  } 
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/xts/xts_mult_x.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2007/03/10 23:59:09 $ */