apps/dsaparam.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h>
  11 #ifdef OPENSSL_NO_DSA
  12 NON_EMPTY_TRANSLATION_UNIT
  13 #else
  14
  15 # include <stdio.h>
  16 # include <stdlib.h>
  17 # include <time.h>
  18 # include <string.h>
  19 # include "apps.h"
  20 # include <openssl/bio.h>
  21 # include <openssl/err.h>
  22 # include <openssl/bn.h>
  23 # include <openssl/dsa.h>
  24 # include <openssl/x509.h>
  25 # include <openssl/pem.h>
  26
  27 static int dsa_cb(int p, int n, BN_GENCB *cb);
  28
  29 typedef enum OPTION_choice {
  30     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  31     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  32     OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_R_ENUM
  33 } OPTION_CHOICE;
  34
  35 const OPTIONS dsaparam_options[] = {
  36     {"help", OPT_HELP, '-', "Display this summary"},
  37     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  38     {"in", OPT_IN, '<', "Input file"},
  39     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  40     {"out", OPT_OUT, '>', "Output file"},
  41     {"text", OPT_TEXT, '-', "Print as text"},
  42     {"C", OPT_C, '-', "Output C code"},
  43     {"noout", OPT_NOOUT, '-', "No output"},
  44     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
  45     OPT_R_OPTIONS,
  46 # ifndef OPENSSL_NO_ENGINE
  47     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  48 # endif
  49     {NULL}
  50 };
  51
  52 int dsaparam_main(int argc, char **argv)
  53 {
  54     ENGINE *e = NULL;
  55     DSA *dsa = NULL;
  56     BIO *in = NULL, *out = NULL;
  57     BN_GENCB *cb = NULL;
  58     int numbits = -1, num = 0, genkey = 0;
  59     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  60     int ret = 1, i, text = 0, private = 0;
  61     char *infile = NULL, *outfile = NULL, *prog;
  62     OPTION_CHOICE o;
  63
  64     prog = opt_init(argc, argv, dsaparam_options);
  65     while ((o = opt_next()) != OPT_EOF) {
  66         switch (o) {
  67         case OPT_EOF:
  68         case OPT_ERR:
  69  opthelp:
  70             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  71             goto end;
  72         case OPT_HELP:
  73             opt_help(dsaparam_options);
  74             ret = 0;
  75             goto end;
  76         case OPT_INFORM:
  77             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  78                 goto opthelp;
  79             break;
  80         case OPT_IN:
  81             infile = opt_arg();
  82             break;
  83         case OPT_OUTFORM:
  84             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
  85                 goto opthelp;
  86             break;
  87         case OPT_OUT:
  88             outfile = opt_arg();
  89             break;
  90         case OPT_ENGINE:
  91             e = setup_engine(opt_arg(), 0);
  92             break;
  93         case OPT_TEXT:
  94             text = 1;
  95             break;
  96         case OPT_C:
  97             C = 1;
  98             break;
  99         case OPT_GENKEY:
 100             genkey = 1;
 101             break;
 102         case OPT_R_CASES:
 103             if (!opt_rand(o))
 104                 goto end;
 105             break;
 106         case OPT_NOOUT:
 107             noout = 1;
 108             break;
 109         }
 110     }
 111     argc = opt_num_rest();
 112     argv = opt_rest();
 113
 114     if (argc == 1) {
 115         if (!opt_int(argv[0], &num) || num < 0)
 116             goto end;
 117         /* generate a key */
 118         numbits = num;
 119     }
 120     private = genkey ? 1 : 0;
 121
 122     in = bio_open_default(infile, 'r', informat);
 123     if (in == NULL)
 124         goto end;
 125     out = bio_open_owner(outfile, outformat, private);
 126     if (out == NULL)
 127         goto end;
 128
 129     if (numbits > 0) {
 130         cb = BN_GENCB_new();
 131         if (cb == NULL) {
 132             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 133             goto end;
 134         }
 135         BN_GENCB_set(cb, dsa_cb, bio_err);
 136         dsa = DSA_new();
 137         if (dsa == NULL) {
 138             BIO_printf(bio_err, "Error allocating DSA object\n");
 139             goto end;
 140         }
 141         BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 142                    num);
 143         BIO_printf(bio_err, "This could take some time\n");
 144         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 145             ERR_print_errors(bio_err);
 146             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 147             goto end;
 148         }
 149     } else if (informat == FORMAT_ASN1) {
 150         dsa = d2i_DSAparams_bio(in, NULL);
 151     } else {
 152         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 153     }
 154     if (dsa == NULL) {
 155         BIO_printf(bio_err, "unable to load DSA parameters\n");
 156         ERR_print_errors(bio_err);
 157         goto end;
 158     }
 159
 160     if (text) {
 161         DSAparams_print(out, dsa);
 162     }
 163
 164     if (C) {
 165         const BIGNUM *p = NULL, *q = NULL, *g = NULL;
 166         unsigned char *data;
 167         int len, bits_p;
 168
 169         DSA_get0_pqg(dsa, &p, &q, &g);
 170         len = BN_num_bytes(p);
 171         bits_p = BN_num_bits(p);
 172
 173         data = app_malloc(len + 20, "BN space");
 174
 175         BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
 176         print_bignum_var(bio_out, p, "dsap", len, data);
 177         print_bignum_var(bio_out, q, "dsaq", len, data);
 178         print_bignum_var(bio_out, g, "dsag", len, data);
 179         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 180                             "\n");
 181         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 182                             "        return NULL;\n");
 183         BIO_printf(bio_out, "    dsa->p = BN_bin2bn(dsap_%d, sizeof (dsap_%d), NULL);\n",
 184                bits_p, bits_p);
 185         BIO_printf(bio_out, "    dsa->q = BN_bin2bn(dsaq_%d, sizeof (dsaq_%d), NULL);\n",
 186                bits_p, bits_p);
 187         BIO_printf(bio_out, "    dsa->g = BN_bin2bn(dsag_%d, sizeof (dsag_%d), NULL);\n",
 188                bits_p, bits_p);
 189         BIO_printf(bio_out, "    if (!dsa->p || !dsa->q || !dsa->g) {\n"
 190                             "        DSA_free(dsa);\n"
 191                             "        return NULL;\n"
 192                             "    }\n"
 193                             "    return(dsa);\n}\n");
 194         OPENSSL_free(data);
 195     }
 196
 197     if (!noout) {
 198         if (outformat == FORMAT_ASN1)
 199             i = i2d_DSAparams_bio(out, dsa);
 200         else
 201             i = PEM_write_bio_DSAparams(out, dsa);
 202         if (!i) {
 203             BIO_printf(bio_err, "unable to write DSA parameters\n");
 204             ERR_print_errors(bio_err);
 205             goto end;
 206         }
 207     }
 208     if (genkey) {
 209         DSA *dsakey;
 210
 211         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 212             goto end;
 213         if (!DSA_generate_key(dsakey)) {
 214             ERR_print_errors(bio_err);
 215             DSA_free(dsakey);
 216             goto end;
 217         }
 218         assert(private);
 219         if (outformat == FORMAT_ASN1)
 220             i = i2d_DSAPrivateKey_bio(out, dsakey);
 221         else
 222             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 223                                             NULL);
 224         DSA_free(dsakey);
 225     }
 226     ret = 0;
 227  end:
 228     BN_GENCB_free(cb);
 229     BIO_free(in);
 230     BIO_free_all(out);
 231     DSA_free(dsa);
 232     release_engine(e);
 233     return (ret);
 234 }
 235
 236 static int dsa_cb(int p, int n, BN_GENCB *cb)
 237 {
 238     char c = '*';
 239
 240     if (p == 0)
 241         c = '.';
 242     if (p == 1)
 243         c = '+';
 244     if (p == 2)
 245         c = '*';
 246     if (p == 3)
 247         c = '\n';
 248     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 249     (void)BIO_flush(BN_GENCB_get_arg(cb));
 250     return 1;
 251 }
 252 #endif