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      1 /* Copyright (c) 2015, Google Inc.
      2  *
      3  * Permission to use, copy, modify, and/or distribute this software for any
      4  * purpose with or without fee is hereby granted, provided that the above
      5  * copyright notice and this permission notice appear in all copies.
      6  *
      7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
     14 
     15 #include <openssl/curve25519.h>
     16 
     17 #include <errno.h>
     18 #include <stdio.h>
     19 #include <string.h>
     20 
     21 #include "internal.h"
     22 
     23 
     24 static const struct argument kArguments[] = {
     25     {
     26         "-out-public", kRequiredArgument, "The file to write the public key to",
     27     },
     28     {
     29         "-out-private", kRequiredArgument,
     30         "The file to write the private key to",
     31     },
     32     {
     33         "", kOptionalArgument, "",
     34     },
     35 };
     36 
     37 static bool WriteToFile(const std::string &path, const uint8_t *in,
     38                         size_t in_len) {
     39   ScopedFILE file(fopen(path.c_str(), "wb"));
     40   if (!file) {
     41     fprintf(stderr, "Failed to open '%s': %s\n", path.c_str(), strerror(errno));
     42     return false;
     43   }
     44   if (fwrite(in, in_len, 1, file.get()) != 1) {
     45     fprintf(stderr, "Failed to write to '%s': %s\n", path.c_str(),
     46             strerror(errno));
     47     return false;
     48   }
     49   return true;
     50 }
     51 
     52 bool GenerateEd25519Key(const std::vector<std::string> &args) {
     53   std::map<std::string, std::string> args_map;
     54 
     55   if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
     56     PrintUsage(kArguments);
     57     return false;
     58   }
     59 
     60   uint8_t public_key[32], private_key[64];
     61   ED25519_keypair(public_key, private_key);
     62 
     63   return WriteToFile(args_map["-out-public"], public_key, sizeof(public_key)) &&
     64          WriteToFile(args_map["-out-private"], private_key,
     65                      sizeof(private_key));
     66 }
     67