1 files changed, 11 insertions, 0 deletions
diff --git a/src/libbiguint/bu_addmod.c b/src/libbiguint/bu_addmod.c
new file mode 100644
index 0000000..c997897
--- /dev/null
+++ b/src/libbiguint/bu_addmod.c
@@ -0,0 +1,11 @@
+/* ISC license. */
+
+#include <skalibs/uint32.h>
+#include <skalibs/biguint.h>
+
+int bu_addmod (uint32 *c, unsigned int cn, uint32 const *a, unsigned int an, uint32 const *b, unsigned int bn, uint32 const *m, unsigned int mn)
+{
+  if (!bu_add(c, cn, a, an, b, bn)) return 0 ;
+  if (bu_cmp(c, cn, m, mn) >= 0) bu_sub(c, cn, c, cn, m, mn) ;
+  return 1 ;
+}