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>

1 files changed, 67 insertions, 0 deletions

diff --git a/tool/generate_ed25519.cc b/tool/generate_ed25519.cc
new file mode 100644
index 00000000..15d36924
--- /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));
+}