1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c
new file mode 100644
index 00000000000..264d90097cf
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c
@@ -0,0 +1,24 @@
+#include "tommath_private.h"
+#ifdef BN_MP_NEG_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* b = -a */
+mp_err mp_neg(const mp_int *a, mp_int *b)
+{
+   mp_err err;
+   if (a != b) {
+      if ((err = mp_copy(a, b)) != MP_OKAY) {
+         return err;
+      }
+   }
+
+   if (!MP_IS_ZERO(b)) {
+      b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
+   } else {
+      b->sign = MP_ZPOS;
+   }
+
+   return MP_OKAY;
+}
+#endif