1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c
new file mode 100644
index 0000000..9e904c5
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c
@@ -0,0 +1,38 @@
+#include "tommath_private.h"
+#ifdef BN_MP_GROW_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* grow as required */
+mp_err mp_grow(mp_int *a, int size)
+{
+   int     i;
+   mp_digit *tmp;
+
+   /* if the alloc size is smaller alloc more ram */
+   if (a->alloc < size) {
+      /* reallocate the array a->dp
+       *
+       * We store the return in a temporary variable
+       * in case the operation failed we don't want
+       * to overwrite the dp member of a.
+       */
+      tmp = (mp_digit *) MP_REALLOC(a->dp,
+                                    (size_t)a->alloc * sizeof(mp_digit),
+                                    (size_t)size * sizeof(mp_digit));
+      if (tmp == NULL) {
+         /* reallocation failed but "a" is still valid [can be freed] */
+         return MP_MEM;
+      }
+
+      /* reallocation succeeded so set a->dp */
+      a->dp = tmp;
+
+      /* zero excess digits */
+      i        = a->alloc;
+      a->alloc = size;
+      MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
+   }
+   return MP_OKAY;
+}
+#endif