HEIMDAL: move code from source4/heimdal* to third_party/heimdal*

This makes it clearer that we always want to do heimdal changes
via the lorikeet-heimdal repository.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>

Autobuild-User(master): Joseph Sutton <jsutton@samba.org>
Autobuild-Date(master): Wed Jan 19 21:41:59 UTC 2022 on sn-devel-184

1 files changed, 28 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_cmp_d.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_cmp_d.c
new file mode 100644
index 00000000000..5a8337b5b8c
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_cmp_d.c
@@ -0,0 +1,28 @@
+#include "tommath_private.h"
+#ifdef BN_MP_CMP_D_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* compare a digit */
+mp_ord mp_cmp_d(const mp_int *a, mp_digit b)
+{
+   /* compare based on sign */
+   if (a->sign == MP_NEG) {
+      return MP_LT;
+   }
+
+   /* compare based on magnitude */
+   if (a->used > 1) {
+      return MP_GT;
+   }
+
+   /* compare the only digit of a to b */
+   if (a->dp[0] > b) {
+      return MP_GT;
+   } else if (a->dp[0] < b) {
+      return MP_LT;
+   } else {
+      return MP_EQ;
+   }
+}
+#endif