375 lines
11 KiB
C
375 lines
11 KiB
C
/*
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* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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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 "progs.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_DSAPARAM, OPT_C, OPT_2, OPT_5,
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OPT_R_ENUM
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} OPTION_CHOICE;
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const 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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OPT_R_OPTIONS,
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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;
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ENGINE *e = 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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e = 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_R_CASES:
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if (!opt_rand(o))
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goto end;
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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] != NULL && (!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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out = bio_open_default(outfile, 'w', outformat);
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if (out == NULL)
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goto end;
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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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#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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} 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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/*
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* We have no PEM header to determine what type of DH params it
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* is. We'll just try both.
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*/
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dh = d2i_DHparams_bio(in, NULL);
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/* BIO_reset() returns 0 for success for file BIOs only!!! */
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if (dh == NULL && BIO_reset(in) == 0)
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dh = d2i_DHxparams_bio(in, NULL);
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} else {
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/* informat == FORMAT_PEM */
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dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
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}
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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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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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BIO_printf(bio_err, "WARNING: p value is not prime\n");
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if (i & DH_CHECK_P_NOT_SAFE_PRIME)
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BIO_printf(bio_err, "WARNING: p value is not a safe prime\n");
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if (i & DH_CHECK_Q_NOT_PRIME)
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BIO_printf(bio_err, "WARNING: q value is not a prime\n");
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if (i & DH_CHECK_INVALID_Q_VALUE)
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BIO_printf(bio_err, "WARNING: q value is invalid\n");
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if (i & DH_CHECK_INVALID_J_VALUE)
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BIO_printf(bio_err, "WARNING: j value is invalid\n");
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if (i & DH_UNABLE_TO_CHECK_GENERATOR)
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BIO_printf(bio_err,
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"WARNING: unable to check the generator value\n");
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if (i & DH_NOT_SUITABLE_GENERATOR)
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BIO_printf(bio_err, "WARNING: the g value is not a generator\n");
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if (i == 0)
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BIO_printf(bio_err, "DH parameters appear to be ok.\n");
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if (num != 0 && i != 0) {
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/*
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* We have generated parameters but DH_check() indicates they are
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* invalid! This should never happen!
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*/
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BIO_printf(bio_err, "ERROR: Invalid parameters generated\n");
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goto end;
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}
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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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const 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, "static DH *get_dh%d(void)\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 *p, *g;\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, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n",
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bits, bits);
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BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n",
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bits, bits);
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BIO_printf(out, " if (p == NULL || g == NULL\n"
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" || !DH_set0_pqg(dh, p, NULL, g)) {\n"
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" DH_free(dh);\n"
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" BN_free(p);\n"
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" BN_free(g);\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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" return NULL;\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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const 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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if (q != NULL)
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i = i2d_DHxparams_bio(out, dh);
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else
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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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}
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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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release_engine(e);
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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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static const char symbols[] = ".+*\n";
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char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
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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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