1 files changed, 25 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_addmod.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_addmod.c
new file mode 100644
index 00000000000..1dcfb678c9c
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_addmod.c
@@ -0,0 +1,25 @@
+#include "tommath_private.h"
+#ifdef BN_MP_ADDMOD_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* d = a + b (mod c) */
+mp_err mp_addmod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
+{
+   mp_err  err;
+   mp_int  t;
+
+   if ((err = mp_init(&t)) != MP_OKAY) {
+      return err;
+   }
+
+   if ((err = mp_add(a, b, &t)) != MP_OKAY) {
+      goto LBL_ERR;
+   }
+   err = mp_mod(&t, c, d);
+
+LBL_ERR:
+   mp_clear(&t);
+   return err;
+}
+#endif