1 files changed, 36 insertions, 0 deletions
diff --git a/libtommath/bn_mp_shrink.c b/libtommath/bn_mp_shrink.c
new file mode 100644
index 0000000..bfdf93a
--- /dev/null
+++ b/libtommath/bn_mp_shrink.c
@@ -0,0 +1,36 @@
+#include <tommath.h>
+#ifdef BN_MP_SHRINK_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
+ */
+
+/* shrink a bignum */
+int mp_shrink (mp_int * a)
+{
+  mp_digit *tmp;
+  int used = 1;
+  
+  if(a->used > 0)
+    used = a->used;
+  
+  if (a->alloc != used) {
+    if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) {
+      return MP_MEM;
+    }
+    a->dp    = tmp;
+    a->alloc = used;
+  }
+  return MP_OKAY;
+}
+#endif