basic: Add some sha256 helper functions

Adds a util function to sha256 an open fd (moved from dissect). Also
adds functions to check if a string contains a valid sha256 hash, and
parse it into a sha256 array.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/basic/sha256.h b/src/basic/sha256.h
new file mode 100644
index 0000000000..95bac1bc1d
--- /dev/null
+++ b/src/basic/sha256.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "sha256-fundamental.h"
+#include "string-util.h"
+
+int sha256_fd(int fd, uint64_t max_size, uint8_t ret[static SHA256_DIGEST_SIZE]);
+
+int parse_sha256(const char *s, uint8_t res[static SHA256_DIGEST_SIZE]);
+
+static inline bool sha256_is_valid(const char *s) {
+        return s && in_charset(s, HEXDIGITS) && (strlen(s) == SHA256_DIGEST_SIZE * 2);
+}