Add a tool to generate Ed25519 keys.
Make it slightly easier for people to use.
Change-Id: I567e95bf1a5c203170a0b9732fd522fcbe5b7bc1
Reviewed-on: https://boringssl-review.googlesource.com/6773
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/tool/generate_ed25519.cc b/tool/generate_ed25519.cc
new file mode 100644
index 0000000..15d3692
--- /dev/null
+++ b/tool/generate_ed25519.cc
@@ -0,0 +1,67 @@
+/* Copyright (c) 2015, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or 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 <openssl/curve25519.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../crypto/test/scoped_types.h"
+#include "internal.h"
+
+
+static const struct argument kArguments[] = {
+ {
+ "-out-public", kRequiredArgument, "The file to write the public key to",
+ },
+ {
+ "-out-private", kRequiredArgument,
+ "The file to write the private key to",
+ },
+ {
+ "", kOptionalArgument, "",
+ },
+};
+
+static bool WriteToFile(const std::string &path, const uint8_t *in,
+ size_t in_len) {
+ ScopedFILE file(fopen(path.c_str(), "wb"));
+ if (!file) {
+ fprintf(stderr, "Failed to open '%s': %s\n", path.c_str(), strerror(errno));
+ return false;
+ }
+ if (fwrite(in, in_len, 1, file.get()) != 1) {
+ fprintf(stderr, "Failed to write to '%s': %s\n", path.c_str(),
+ strerror(errno));
+ return false;
+ }
+ return true;
+}
+
+bool GenerateEd25519Key(const std::vector<std::string> &args) {
+ std::map<std::string, std::string> args_map;
+
+ if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
+ PrintUsage(kArguments);
+ return false;
+ }
+
+ uint8_t public_key[32], private_key[64];
+ ED25519_keypair(public_key, private_key);
+
+ return WriteToFile(args_map["-out-public"], public_key, sizeof(public_key)) &&
+ WriteToFile(args_map["-out-private"], private_key,
+ sizeof(private_key));
+}
