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107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
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Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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This tool generates a CurveZMQ keypair, as two printable strings you can
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use in configuration files or source code. The encoding uses Z85, which
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is a base-85 format that is described in 0MQ RFC 32, and which has an
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implementation in the z85_codec.h source used by this tool. The keypair
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always works with the secret key held by one party and the public key
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distributed (securely!) to peers wishing to connect to it.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "../src/platform.hpp"
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#ifdef HAVE_LIBSODIUM
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# include <sodium.h>
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#endif
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// Maps base 256 to base 85
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static char encoder [85 + 1] = {
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"0123456789" "abcdefghij" "klmnopqrst" "uvwxyzABCD"
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"EFGHIJKLMN" "OPQRSTUVWX" "YZ.-:+=^!/" "*?&<>()[]{"
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"}@%$#"
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};
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// --------------------------------------------------------------------------
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// Encode a binary frame as a string; destination string MUST be at least
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// size * 5 / 4 bytes long plus 1 byte for the null terminator. Returns
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// dest. Size must be a multiple of 4.
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static char *
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Z85_encode (char *dest, uint8_t *data, size_t size)
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{
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assert (size % 4 == 0);
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uint char_nbr = 0;
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uint byte_nbr = 0;
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uint32_t value = 0;
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while (byte_nbr < size) {
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// Accumulate value in base 256 (binary)
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value = value * 256 + data [byte_nbr++];
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if (byte_nbr % 4 == 0) {
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// Output value in base 85
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uint divisor = 85 * 85 * 85 * 85;
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while (divisor) {
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dest [char_nbr++] = encoder [value / divisor % 85];
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divisor /= 85;
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}
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value = 0;
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}
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}
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assert (char_nbr == size * 5 / 4);
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dest [char_nbr] = 0;
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return dest;
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}
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int main (void)
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{
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#ifdef HAVE_LIBSODIUM
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# if crypto_box_PUBLICKEYBYTES != 32 \
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|| crypto_box_SECRETKEYBYTES != 32
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# error "libsodium not built correctly"
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# endif
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puts ("This tool generates a CurveZMQ keypair, as two printable strings you can");
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puts ("use in configuration files or source code. The encoding uses Z85, which");
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puts ("is a base-85 format that is described in 0MQ RFC 32, and which has an");
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puts ("implementation in the z85_codec.h source used by this tool. The keypair");
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puts ("always works with the secret key held by one party and the public key");
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puts ("distributed (securely!) to peers wishing to connect to it.");
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uint8_t public_key [32];
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uint8_t secret_key [32];
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int rc = crypto_box_keypair (public_key, secret_key);
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assert (rc == 0);
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char encoded [41];
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Z85_encode (encoded, public_key, 32);
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puts ("\n== CURVE PUBLIC KEY ==");
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puts (encoded);
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Z85_encode (encoded, secret_key, 32);
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puts ("\n== CURVE SECRET KEY ==");
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puts (encoded);
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#else
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puts ("To build curve_keygen, please install libsodium and then rebuild libzmq.");
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#endif
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exit (0);
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}
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