1 files changed, 28 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_is_2k_l.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_is_2k_l.c
new file mode 100644
index 0000000..4bc69be
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_is_2k_l.c
@@ -0,0 +1,28 @@
+#include "tommath_private.h"
+#ifdef BN_MP_REDUCE_IS_2K_L_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* determines if reduce_2k_l can be used */
+mp_bool mp_reduce_is_2k_l(const mp_int *a)
+{
+   int ix, iy;
+
+   if (a->used == 0) {
+      return MP_NO;
+   } else if (a->used == 1) {
+      return MP_YES;
+   } else if (a->used > 1) {
+      /* if more than half of the digits are -1 we're sold */
+      for (iy = ix = 0; ix < a->used; ix++) {
+         if (a->dp[ix] == MP_DIGIT_MAX) {
+            ++iy;
+         }
+      }
+      return (iy >= (a->used/2)) ? MP_YES : MP_NO;
+   } else {
+      return MP_NO;
+   }
+}
+
+#endif