1 files changed, 51 insertions, 0 deletions
diff --git a/libtommath/bn_mp_xor.c b/libtommath/bn_mp_xor.c
new file mode 100644
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+++ b/libtommath/bn_mp_xor.c
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+#include <tommath.h>
+#ifdef BN_MP_XOR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
+ */
+
+/* XOR two ints together */
+int
+mp_xor (mp_int * a, mp_int * b, mp_int * c)
+{
+  int     res, ix, px;
+  mp_int  t, *x;
+
+  if (a->used > b->used) {
+    if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
+      return res;
+    }
+    px = b->used;
+    x = b;
+  } else {
+    if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
+      return res;
+    }
+    px = a->used;
+    x = a;
+  }
+
+  for (ix = 0; ix < px; ix++) {
+     t.dp[ix] ^= x->dp[ix];
+  }
+  mp_clamp (&t);
+  mp_exch (c, &t);
+  mp_clear (&t);
+  return MP_OKAY;
+}
+#endif
+
+/* $Source: /cvs/libtom/libtommath/bn_mp_xor.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2006/03/31 14:18:44 $ */