114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/*
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rsagen.c -- RSA key generation and export
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Copyright (C) 2008-2013 Guus Sliepen <guus@tinc-vpn.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "../system.h"
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#define __TINC_RSA_INTERNAL__
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typedef RSA rsa_t;
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#include "../logger.h"
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#include "../rsagen.h"
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#include "../xalloc.h"
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/* This function prettyprints the key generation process */
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static int indicator(int a, int b, BN_GENCB *cb) {
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switch (a) {
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case 0:
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fprintf(stderr, ".");
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break;
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case 1:
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fprintf(stderr, "+");
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break;
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case 2:
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fprintf(stderr, "-");
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break;
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case 3:
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switch (b) {
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case 0:
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fprintf(stderr, " p\n");
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break;
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case 1:
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fprintf(stderr, " q\n");
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break;
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default:
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fprintf(stderr, "?");
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}
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break;
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default:
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fprintf(stderr, "?");
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}
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return 1;
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}
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// Generate RSA key
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#ifndef HAVE_BN_GENCB_NEW
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BN_GENCB *BN_GENCB_new(void) {
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return xzalloc(sizeof(BN_GENCB));
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}
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void BN_GENCB_free(BN_GENCB *cb) {
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free(cb);
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}
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#endif
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rsa_t *rsa_generate(size_t bits, unsigned long exponent) {
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BIGNUM *bn_e = BN_new();
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rsa_t *rsa = RSA_new();
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BN_GENCB *cb = BN_GENCB_new();
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if(!bn_e || !rsa || !cb)
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abort();
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BN_set_word(bn_e, exponent);
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BN_GENCB_set(cb, indicator, NULL);
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int result = RSA_generate_key_ex(rsa, bits, bn_e, cb);
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BN_GENCB_free(cb);
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BN_free(bn_e);
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if(!result) {
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fprintf(stderr, "Error during key generation!\n");
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RSA_free(rsa);
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return NULL;
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}
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return rsa;
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}
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// Write PEM RSA keys
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bool rsa_write_pem_public_key(rsa_t *rsa, FILE *fp) {
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return PEM_write_RSAPublicKey(fp, rsa);
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}
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bool rsa_write_pem_private_key(rsa_t *rsa, FILE *fp) {
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return PEM_write_RSAPrivateKey(fp, rsa, NULL, NULL, 0, NULL, NULL);
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}
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