/* $OpenBSD: gendh.c,v 1.14 2023/03/06 14:32:06 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <openssl/opensslconf.h> /* Until the key-gen callbacks are modified to use newer prototypes, we allow * deprecated functions for openssl-internal code */ #ifdef OPENSSL_NO_DEPRECATED #undef OPENSSL_NO_DEPRECATED #endif #ifndef OPENSSL_NO_DH #include <sys/types.h> #include <sys/stat.h> #include <limits.h> #include <stdio.h> #include <string.h> #include "apps.h" #include <openssl/bio.h> #include <openssl/bn.h> #include <openssl/dh.h> #include <openssl/err.h> #include <openssl/pem.h> #include <openssl/x509.h> #define DEFBITS 512 static int dh_cb(int p, int n, BN_GENCB *cb); static struct { int g; char *outfile; } cfg; static const struct option gendh_options[] = { { .name = "2", .desc = "Generate DH parameters with a generator value of 2 " "(default)", .type = OPTION_VALUE, .value = 2, .opt.value = &cfg.g, }, { .name = "5", .desc = "Generate DH parameters with a generator value of 5", .type = OPTION_VALUE, .value = 5, .opt.value = &cfg.g, }, { .name = "out", .argname = "file", .desc = "Output file (default stdout)", .type = OPTION_ARG, .opt.arg = &cfg.outfile, }, { NULL }, }; static void gendh_usage(void) { fprintf(stderr, "usage: gendh [-2 | -5] [-out file] [numbits]\n\n"); options_usage(gendh_options); } int gendh_main(int argc, char **argv) { BN_GENCB *cb = NULL; DH *dh = NULL; int ret = 1, numbits = DEFBITS; BIO *out = NULL; char *strbits = NULL; if (pledge("stdio cpath wpath rpath", NULL) == -1) { perror("pledge"); exit(1); } if ((cb = BN_GENCB_new()) == NULL) { BIO_printf(bio_err, "Error allocating BN_GENCB object\n"); goto end; } BN_GENCB_set(cb, dh_cb, bio_err); memset(&cfg, 0, sizeof(cfg)); cfg.g = 2; if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) { gendh_usage(); goto end; } if (strbits != NULL) { const char *errstr; numbits = strtonum(strbits, 0, INT_MAX, &errstr); if (errstr) { fprintf(stderr, "Invalid number of bits: %s\n", errstr); goto end; } } out = BIO_new(BIO_s_file()); if (out == NULL) { ERR_print_errors(bio_err); goto end; } if (cfg.outfile == NULL) { BIO_set_fp(out, stdout, BIO_NOCLOSE); } else { if (BIO_write_filename(out, cfg.outfile) <= 0) { perror(cfg.outfile); goto end; } } BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime," " generator %d\n", numbits, cfg.g); BIO_printf(bio_err, "This is going to take a long time\n"); if (((dh = DH_new()) == NULL) || !DH_generate_parameters_ex(dh, numbits, cfg.g, cb)) goto end; if (!PEM_write_bio_DHparams(out, dh)) goto end; ret = 0; end: if (ret != 0) ERR_print_errors(bio_err); BIO_free_all(out); BN_GENCB_free(cb); DH_free(dh); return (ret); } static int dh_cb(int p, int n, BN_GENCB *cb) { char c = '*'; if (p == 0) c = '.'; if (p == 1) c = '+'; if (p == 2) c = '*'; if (p == 3) c = '\n'; BIO_write(BN_GENCB_get_arg(cb), &c, 1); (void) BIO_flush(BN_GENCB_get_arg(cb)); return 1; } #endif
