464 lines
16 KiB
C
464 lines
16 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <openssl/opensslconf.h>
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#ifdef OPENSSL_NO_DH
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NON_EMPTY_TRANSLATION_UNIT
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#else
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# include <stdio.h>
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# include <stdlib.h>
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# include <time.h>
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# include <string.h>
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# include "apps.h"
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# include <openssl/bio.h>
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# include <openssl/err.h>
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# include <openssl/bn.h>
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# include <openssl/dh.h>
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# include <openssl/x509.h>
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# include <openssl/pem.h>
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# ifndef OPENSSL_NO_DSA
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# include <openssl/dsa.h>
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# endif
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# define DEFBITS 2048
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static int dh_cb(int p, int n, BN_GENCB *cb);
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typedef enum OPTION_choice {
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OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
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OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
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OPT_RAND, OPT_DSAPARAM, OPT_C, OPT_2, OPT_5
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} OPTION_CHOICE;
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OPTIONS dhparam_options[] = {
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{OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"},
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{OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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{"help", OPT_HELP, '-', "Display this summary"},
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{"in", OPT_IN, '<', "Input file"},
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{"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
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{"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
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{"out", OPT_OUT, '>', "Output file"},
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{"check", OPT_CHECK, '-', "Check the DH parameters"},
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{"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
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{"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
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{"rand", OPT_RAND, 's',
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"Load the file(s) into the random number generator"},
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{"C", OPT_C, '-', "Print C code"},
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{"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
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{"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
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# ifndef OPENSSL_NO_DSA
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{"dsaparam", OPT_DSAPARAM, '-',
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"Read or generate DSA parameters, convert to DH"},
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# endif
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# ifndef OPENSSL_NO_ENGINE
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{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
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# endif
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{NULL}
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};
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int dhparam_main(int argc, char **argv)
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{
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BIO *in = NULL, *out = NULL;
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DH *dh = NULL;
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char *infile = NULL, *outfile = NULL, *prog, *inrand = NULL;
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#ifndef OPENSSL_NO_DSA
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int dsaparam = 0;
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#endif
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int i, text = 0, C = 0, ret = 1, num = 0, g = 0;
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int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
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OPTION_CHOICE o;
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prog = opt_init(argc, argv, dhparam_options);
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while ((o = opt_next()) != OPT_EOF) {
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switch (o) {
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case OPT_EOF:
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case OPT_ERR:
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opthelp:
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BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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goto end;
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case OPT_HELP:
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opt_help(dhparam_options);
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ret = 0;
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goto end;
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case OPT_INFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
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goto opthelp;
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break;
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case OPT_OUTFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
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goto opthelp;
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break;
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case OPT_IN:
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infile = opt_arg();
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break;
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case OPT_OUT:
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outfile = opt_arg();
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break;
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case OPT_ENGINE:
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(void)setup_engine(opt_arg(), 0);
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break;
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case OPT_CHECK:
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check = 1;
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break;
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case OPT_TEXT:
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text = 1;
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break;
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case OPT_DSAPARAM:
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#ifndef OPENSSL_NO_DSA
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dsaparam = 1;
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#endif
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break;
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case OPT_C:
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C = 1;
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break;
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case OPT_2:
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g = 2;
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break;
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case OPT_5:
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g = 5;
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break;
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case OPT_NOOUT:
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noout = 1;
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break;
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case OPT_RAND:
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inrand = opt_arg();
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break;
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}
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}
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argc = opt_num_rest();
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argv = opt_rest();
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if (argv[0] && (!opt_int(argv[0], &num) || num <= 0))
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goto end;
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if (g && !num)
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num = DEFBITS;
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# ifndef OPENSSL_NO_DSA
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if (dsaparam && g) {
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BIO_printf(bio_err,
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"generator may not be chosen for DSA parameters\n");
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goto end;
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}
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# endif
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/* DH parameters */
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if (num && !g)
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g = 2;
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if (num) {
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BN_GENCB *cb;
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cb = BN_GENCB_new();
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if (cb == NULL) {
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ERR_print_errors(bio_err);
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goto end;
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}
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BN_GENCB_set(cb, dh_cb, bio_err);
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if (!app_RAND_load_file(NULL, 1) && inrand == NULL) {
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BIO_printf(bio_err,
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"warning, not much extra random data, consider using the -rand option\n");
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}
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if (inrand != NULL)
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BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
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app_RAND_load_files(inrand));
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# ifndef OPENSSL_NO_DSA
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if (dsaparam) {
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DSA *dsa = DSA_new();
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BIO_printf(bio_err,
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"Generating DSA parameters, %d bit long prime\n", num);
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if (dsa == NULL
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|| !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
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cb)) {
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DSA_free(dsa);
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BN_GENCB_free(cb);
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ERR_print_errors(bio_err);
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goto end;
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}
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dh = DSA_dup_DH(dsa);
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DSA_free(dsa);
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if (dh == NULL) {
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BN_GENCB_free(cb);
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ERR_print_errors(bio_err);
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goto end;
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}
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} else
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# endif
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{
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dh = DH_new();
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BIO_printf(bio_err,
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"Generating DH parameters, %d bit long safe prime, generator %d\n",
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num, g);
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BIO_printf(bio_err, "This is going to take a long time\n");
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if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) {
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BN_GENCB_free(cb);
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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BN_GENCB_free(cb);
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app_RAND_write_file(NULL);
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} else {
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in = bio_open_default(infile, 'r', informat);
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if (in == NULL)
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goto end;
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# ifndef OPENSSL_NO_DSA
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if (dsaparam) {
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DSA *dsa;
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if (informat == FORMAT_ASN1)
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dsa = d2i_DSAparams_bio(in, NULL);
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else /* informat == FORMAT_PEM */
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dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
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if (dsa == NULL) {
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BIO_printf(bio_err, "unable to load DSA parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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dh = DSA_dup_DH(dsa);
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DSA_free(dsa);
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if (dh == NULL) {
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ERR_print_errors(bio_err);
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goto end;
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}
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} else
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# endif
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{
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if (informat == FORMAT_ASN1)
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dh = d2i_DHparams_bio(in, NULL);
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else /* informat == FORMAT_PEM */
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dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
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if (dh == NULL) {
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BIO_printf(bio_err, "unable to load DH parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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/* dh != NULL */
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}
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out = bio_open_default(outfile, 'w', outformat);
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if (out == NULL)
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goto end;
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if (text) {
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DHparams_print(out, dh);
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}
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if (check) {
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if (!DH_check(dh, &i)) {
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ERR_print_errors(bio_err);
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goto end;
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}
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if (i & DH_CHECK_P_NOT_PRIME)
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printf("p value is not prime\n");
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if (i & DH_CHECK_P_NOT_SAFE_PRIME)
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printf("p value is not a safe prime\n");
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if (i & DH_UNABLE_TO_CHECK_GENERATOR)
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printf("unable to check the generator value\n");
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if (i & DH_NOT_SUITABLE_GENERATOR)
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printf("the g value is not a generator\n");
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if (i == 0)
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printf("DH parameters appear to be ok.\n");
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}
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if (C) {
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unsigned char *data;
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int len, bits;
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BIGNUM *pbn, *gbn;
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len = DH_size(dh);
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bits = DH_bits(dh);
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DH_get0_pqg(dh, &pbn, NULL, &gbn);
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data = app_malloc(len, "print a BN");
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BIO_printf(out, "#ifndef HEADER_DH_H\n"
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"# include <openssl/dh.h>\n"
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"#endif\n"
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"\n");
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BIO_printf(out, "DH *get_dh%d()\n{\n", bits);
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print_bignum_var(out, pbn, "dhp", bits, data);
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print_bignum_var(out, gbn, "dhg", bits, data);
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BIO_printf(out, " DH *dh = DH_new();\n"
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" BIGNUM *dhp_bn, *dhg_bn;\n"
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"\n"
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" if (dh == NULL)\n"
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" return NULL;\n");
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BIO_printf(out, " dhp_bn = BN_bin2bn(dhp_%d, sizeof (dhp_%d), NULL);\n",
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bits, bits);
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BIO_printf(out, " dhg_bn = BN_bin2bn(dhg_%d, sizeof (dhg_%d), NULL);\n",
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bits, bits);
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BIO_printf(out, " if (dhp_bn == NULL || dhg_bn == NULL\n"
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" || !DH_set0_pqg(dh, dhp_bn, NULL, dhg_bn)) {\n"
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" DH_free(dh);\n"
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" BN_free(dhp_bn);\n"
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" BN_free(dhg_bn);\n"
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" return NULL;\n"
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" }\n");
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if (DH_get_length(dh) > 0)
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BIO_printf(out,
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" if (!DH_set_length(dh, %ld)) {\n"
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" DH_free(dh);\n"
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" }\n", DH_get_length(dh));
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BIO_printf(out, " return dh;\n}\n");
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OPENSSL_free(data);
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}
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if (!noout) {
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BIGNUM *q;
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DH_get0_pqg(dh, NULL, &q, NULL);
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if (outformat == FORMAT_ASN1)
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i = i2d_DHparams_bio(out, dh);
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else if (q != NULL)
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i = PEM_write_bio_DHxparams(out, dh);
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else
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i = PEM_write_bio_DHparams(out, dh);
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if (!i) {
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BIO_printf(bio_err, "unable to write DH parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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ret = 0;
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end:
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BIO_free(in);
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BIO_free_all(out);
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DH_free(dh);
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return (ret);
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}
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static int dh_cb(int p, int n, BN_GENCB *cb)
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{
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char c = '*';
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if (p == 0)
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c = '.';
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if (p == 1)
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c = '+';
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if (p == 2)
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c = '*';
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if (p == 3)
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c = '\n';
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BIO_write(BN_GENCB_get_arg(cb), &c, 1);
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(void)BIO_flush(BN_GENCB_get_arg(cb));
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return 1;
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}
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#endif
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