1 files changed, 11 insertions, 1 deletions

diff --git a/src/lib/libcrypto/crypto_internal.h b/src/lib/libcrypto/crypto_internal.h
index c5de5b7b51..09ae7fa466 100644
--- a/src/lib/libcrypto/crypto_internal.h
+++ b/src/lib/libcrypto/crypto_internal.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: crypto_internal.h,v 1.14 2024/11/08 14:05:43 jsing Exp $ */
+/*      $OpenBSD: crypto_internal.h,v 1.15 2025/01/19 07:51:41 jsing Exp $ */
 /*
  * Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
  *
@@ -256,6 +256,16 @@ crypto_store_htole32(uint8_t *dst, uint32_t v)
 }
 #endif
 
+#ifndef HAVE_CRYPTO_ADD_U32DW_U64
+static inline void
+crypto_add_u32dw_u64(uint32_t *h, uint32_t *l, uint64_t v)
+{
+        v += ((uint64_t)*h << 32) | *l;
+        *h = v >> 32;
+        *l = v;
+}
+#endif
+
 #ifndef HAVE_CRYPTO_ROL_U32
 static inline uint32_t
 crypto_rol_u32(uint32_t v, size_t shift)