X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;ds=sidebyside;f=tomsfastmath%2Fsrc%2Faddsub%2Ffp_submod.c;fp=tomsfastmath%2Fsrc%2Faddsub%2Ffp_submod.c;h=7e1ad480e5cfdb2ab2033759bb62b9a01477fcd2;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/tomsfastmath/src/addsub/fp_submod.c b/tomsfastmath/src/addsub/fp_submod.c
new file mode 100644
index 0000000..7e1ad48
--- /dev/null
+++ b/tomsfastmath/src/addsub/fp_submod.c
@@ -0,0 +1,24 @@
+/* TomsFastMath, a fast ISO C bignum library.
+ * 
+ * This project is meant to fill in where LibTomMath
+ * falls short.  That is speed ;-)
+ *
+ * This project is public domain and free for all purposes.
+ * 
+ * Tom St Denis, tomstdenis@gmail.com
+ */
+#include <tfm_private.h>
+
+/* d = a - b (mod c) */
+int fp_submod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
+{
+  fp_int tmp;
+  fp_zero(&tmp);
+  fp_sub(a, b, &tmp);
+  return fp_mod(&tmp, c, d);
+}
+
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */