Commit 6df187aea440d1859393675de264a86a4936f9ca
2011-11-13T19:17:46
Add set_long and get_long functions They work on platform-dependent long ints
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diff --git a/bn_mp_get_long.c b/bn_mp_get_long.c
new file mode 100644
index 0000000..1ea6a85
--- /dev/null
+++ b/bn_mp_get_long.c
@@ -0,0 +1,39 @@
+#include <tommath.h>
+#ifdef BN_MP_GET_INT_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 of an mp_int, platform dependent */
+unsigned long mp_get_long(mp_int * a)
+{
+ int i;
+ unsigned 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)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
+
+ /* get most significant digit of result */
+ res = DIGIT(a,i);
+
+ while (--i >= 0) {
+ res = (res << DIGIT_BIT) | DIGIT(a,i);
+ }
+ return res;
+}
+#endif
diff --git a/bn_mp_set_long.c b/bn_mp_set_long.c
new file mode 100644
index 0000000..7751016
--- /dev/null
+++ b/bn_mp_set_long.c
@@ -0,0 +1,48 @@
+#include <tommath.h>
+#ifdef BN_MP_SET_INT_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 int */
+int mp_set_long (mp_int * a, unsigned long b)
+{
+ int x, res;
+
+ mp_zero (a);
+
+ /* set four bits at a time */
+ for (x = 0; x < sizeof(unsigned long) * 2; x++) {
+ /* shift the number up four bits */
+ if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) {
+ return res;
+ }
+
+ /* OR in the top four bits of the source */
+ a->dp[0] |= (b >> ((sizeof(unsigned long)) * 8 - 4)) & 15;
+
+ /* shift the source up to the next four bits */
+ b <<= 4;
+
+ /* ensure that digits are not clamped off */
+ a->used += 1;
+ }
+ mp_clamp (a);
+ return MP_OKAY;
+}
+#endif
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */
diff --git a/tommath.h b/tommath.h
index 800d4b6..a3faf35 100644
--- a/tommath.h
+++ b/tommath.h
@@ -242,9 +242,15 @@ void mp_set(mp_int *a, mp_digit b);
/* set a 32-bit const */
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);
+
/* 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);
+
/* initialize and set a digit */
int mp_init_set (mp_int * a, mp_digit b);