1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_copy.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_copy.c
new file mode 100644
index 0000000..e72fcf6
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_copy.c
@@ -0,0 +1,47 @@
+#include "tommath_private.h"
+#ifdef BN_MP_COPY_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* copy, b = a */
+mp_err mp_copy(const mp_int *a, mp_int *b)
+{
+   int n;
+   mp_digit *tmpa, *tmpb;
+   mp_err err;
+
+   /* if dst == src do nothing */
+   if (a == b) {
+      return MP_OKAY;
+   }
+
+   /* grow dest */
+   if (b->alloc < a->used) {
+      if ((err = mp_grow(b, a->used)) != MP_OKAY) {
+         return err;
+      }
+   }
+
+   /* zero b and copy the parameters over */
+   /* pointer aliases */
+
+   /* source */
+   tmpa = a->dp;
+
+   /* destination */
+   tmpb = b->dp;
+
+   /* copy all the digits */
+   for (n = 0; n < a->used; n++) {
+      *tmpb++ = *tmpa++;
+   }
+
+   /* clear high digits */
+   MP_ZERO_DIGITS(tmpb, b->used - n);
+
+   /* copy used count and sign */
+   b->used = a->used;
+   b->sign = a->sign;
+   return MP_OKAY;
+}
+#endif