core: build: Add manifest handling

This resolves redundant rebuilds by detecting when there are differences
in a built file.

Signed-off-by: Chloe M. <chloe@aptel.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/head/bop/hash.h b/head/bop/hash.h
new file mode 100644
index 0000000..011812f
--- /dev/null
+++ b/head/bop/hash.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2026, Chloe M., et al.
+ * Provided under the BSD-3 clause.
+ */
+
+#ifndef BOP_HASH_H
+#define BOP_HASH_H 1
+
+#include <stdint.h>
+#include <stddef.h>
+#include <openssl/sha.h>
+
+#define BOP_HASH_LEN 65
+
+/*
+ * Hash a file with SHA256
+ *
+ * @path:       Path of file to hash
+ * @hashres:    Hash result is written here
+ *
+ * Returns zero on success
+ */
+int bop_hash_file(const char *path, char hashres[BOP_HASH_LEN]);
+
+#endif  /* !BOP_HASH_H */