Use openssl's sha1 and sha256, optionally (#15472)

src/util/hashing.h

@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: 2024 Luanti Contributors
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#pragma once
+
+#include <string>
+#include <string_view>
+
+namespace hashing
+{
+
+// Size of raw digest in bytes
+constexpr size_t SHA1_DIGEST_SIZE = 20;
+constexpr size_t SHA256_DIGEST_SIZE = 32;
+
+// Returns the digest of data
+std::string sha1(std::string_view data);
+std::string sha256(std::string_view data);
+
+}