1 files changed, 16 insertions, 0 deletions
diff --git a/src/libbiguint/bu_mulmod.c b/src/libbiguint/bu_mulmod.c
new file mode 100644
index 0000000..18e5a1c
--- /dev/null
+++ b/src/libbiguint/bu_mulmod.c
@@ -0,0 +1,16 @@
+/* ISC license. */
+
+#include <skalibs/uint32.h>
+#include <skalibs/biguint.h>
+
+ /* Nope, no Montgomery either. */
+
+int bu_mulmod (uint32 *c, unsigned int cn, uint32 const *a, unsigned int an, uint32 const *b, unsigned int bn, uint32 const *m, unsigned int mn)
+{
+  unsigned int alen = bu_len(a, an) ;
+  unsigned int blen = bu_len(b, bn) ;
+  uint32 x[alen+blen] ;
+  if (!bu_mul(x, alen+blen, a, alen, b, blen)) return 0 ;
+  if (!bu_mod(x, alen+blen, m, mn)) return 0 ;
+  return bu_copy(c, cn, x, mn) ;
+}