Provide and use crypto_store_htobe64().

It is common to need to store data in a specific endianness - rather than
handrolling and deduplicating code to do this, provide a
crypto_store_htobe64() function that converts from host endian to big
endian, before storing the data to a location with unknown alignment.

ok tb@

1 files changed, 34 insertions, 0 deletions

diff --git a/src/lib/libcrypto/crypto_internal.h b/src/lib/libcrypto/crypto_internal.h
new file mode 100644
index 0000000000..af2a87216e
--- /dev/null
+++ b/src/lib/libcrypto/crypto_internal.h
@@ -0,0 +1,34 @@
+/*      $OpenBSD: crypto_internal.h,v 1.1 2023/04/12 04:40:39 jsing Exp $ */
+/*
+ * Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <endian.h>
+#include <stddef.h>
+#include <string.h>
+
+#ifndef HEADER_CRYPTO_INTERNAL_H
+#define HEADER_CRYPTO_INTERNAL_H
+
+#ifndef HAVE_CRYPTO_STORE_HTOBE64
+static inline void
+crypto_store_htobe64(uint8_t *dst, uint64_t v)
+{
+        v = htobe64(v);
+        memcpy(dst, &v, sizeof(v));
+}
+#endif
+
+#endif