Move decryption {ex,im}port code to a new file.

1 files changed, 83 insertions, 0 deletions

diff --git a/src/lib/export_decryption_settings.cc b/src/lib/export_decryption_settings.cc
new file mode 100644
index 000000000..1ba791251
--- /dev/null
+++ b/src/lib/export_decryption_settings.cc
@@ -0,0 +1,83 @@
+/*
+    Copyright (C) 2025 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "config.h"
+#include "dcpomatic_assert.h"
+#include "exceptions.h"
+#include <dcp/certificate_chain.h>
+#include <dcp/file.h>
+
+
+using std::make_shared;
+using std::shared_ptr;
+using std::string;
+
+
+void
+export_decryption_chain_and_key(shared_ptr<const dcp::CertificateChain> chain, boost::filesystem::path const& path)
+{
+	dcp::File f(path, "w");
+	if (!f) {
+		throw OpenFileError(path, f.open_error(), OpenFileError::WRITE);
+	}
+
+	auto const certs = chain->chain();
+	f.checked_write(certs.c_str(), certs.length());
+	auto const key = chain->key();
+	DCPOMATIC_ASSERT(key);
+	f.checked_write(key->c_str(), key->length());
+}
+
+
+shared_ptr<dcp::CertificateChain>
+import_decryption_chain_and_key(boost::filesystem::path const& path)
+{
+	auto new_chain = make_shared<dcp::CertificateChain>();
+
+	dcp::File f(path, "r");
+	if (!f) {
+		throw OpenFileError(f.path(), f.open_error(), OpenFileError::WRITE);
+	}
+
+	string current;
+	while (!f.eof()) {
+		char buffer[128];
+		if (f.gets(buffer, 128) == 0) {
+			break;
+		}
+		current += buffer;
+
+		if (strncmp(buffer, "-----END CERTIFICATE-----", 25) == 0) {
+			new_chain->add(dcp::Certificate(current));
+			current = "";
+		} else if (strncmp(buffer, "-----END RSA PRIVATE KEY-----", 29) == 0) {
+			new_chain->set_key(current);
+			current = "";
+		}
+	}
+
+	if (!new_chain->chain_valid() || !new_chain->private_key_valid()) {
+		return {};
+	}
+
+	return new_chain;
+}
+