From 0e3d3ad29d8036cac941df1664866ef3b344e76f Mon Sep 17 00:00:00 2001
From: Steffen Jaeckel <s@jaeckel.eu>
Date: Wed, 10 Dec 2014 18:59:31 +0100
Subject: [PATCH] add mp_get_long_long() and mp_set_long_long()

---
 bn_mp_get_long_long.c | 41 +++++++++++++++++++++++++++++++++++++++++
 bn_mp_set_long_long.c | 24 ++++++++++++++++++++++++
 tommath.h             |  6 ++++++
 3 files changed, 71 insertions(+)
 create mode 100644 bn_mp_get_long_long.c
 create mode 100644 bn_mp_set_long_long.c

diff --git a/bn_mp_get_long_long.c b/bn_mp_get_long_long.c
new file mode 100644
index 0000000..b4134c5
--- /dev/null
+++ b/bn_mp_get_long_long.c
@@ -0,0 +1,41 @@
+#include <tommath.h>
+#ifdef BN_MP_GET_LONG_LONG_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://libtom.org
+ */
+
+/* get the lower unsigned long long of an mp_int, platform dependent */
+unsigned long long mp_get_long_long (mp_int * a)
+{
+  int i;
+  unsigned long long res;
+
+  if (a->used == 0) {
+     return 0;
+  }
+
+  /* get number of digits of the lsb we have to read */
+  i = MIN(a->used,(int)((sizeof(unsigned long long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
+
+  /* get most significant digit of result */
+  res = DIGIT(a,i);
+
+#if DIGIT_BIT < 64
+  while (--i >= 0) {
+    res = (res << DIGIT_BIT) | DIGIT(a,i);
+  }
+#endif
+  return res;
+}
+#endif
diff --git a/bn_mp_set_long_long.c b/bn_mp_set_long_long.c
new file mode 100644
index 0000000..eab40b9
--- /dev/null
+++ b/bn_mp_set_long_long.c
@@ -0,0 +1,24 @@
+#include <tommath.h>
+#ifdef BN_MP_SET_LONG_LONG_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://libtom.org
+ */
+
+/* set a platform dependent unsigned long long int */
+MP_SET_XLONG(mp_set_long_long, unsigned long long)
+#endif
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */
diff --git a/tommath.h b/tommath.h
index 051bdcb..bccd9d9 100644
--- a/tommath.h
+++ b/tommath.h
@@ -245,12 +245,18 @@ int mp_set_int(mp_int *a, unsigned long b);
 /* set a platform dependent unsigned long value */
 int mp_set_long(mp_int *a, unsigned long b);
 
+/* set a platform dependent unsigned long long value */
+int mp_set_long_long(mp_int *a, unsigned long long b);
+
 /* get a 32-bit value */
 unsigned long mp_get_int(mp_int * a);
 
 /* get a platform dependent unsigned long value */
 unsigned long mp_get_long(mp_int * a);
 
+/* get a platform dependent unsigned long long value */
+unsigned long long mp_get_long_long(mp_int * a);
+
 /* initialize and set a digit */
 int mp_init_set (mp_int * a, mp_digit b);