apps/dsaparam.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "progs.h"
  21 # include <openssl/bio.h>
  22 # include <openssl/err.h>
  23 # include <openssl/bn.h>
  24 # include <openssl/dsa.h>
  25 # include <openssl/x509.h>
  26 # include <openssl/pem.h>
  27
  28 static int verbose = 0;
  29
  30 static int dsa_cb(int p, int n, BN_GENCB *cb);
  31
  32 typedef enum OPTION_choice {
  33     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  34     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  35     OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
  36     OPT_R_ENUM
  37 } OPTION_CHOICE;
  38
  39 const OPTIONS dsaparam_options[] = {
  40     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
  41
  42     OPT_SECTION("General"),
  43     {"help", OPT_HELP, '-', "Display this summary"},
  44 # ifndef OPENSSL_NO_ENGINE
  45     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  46 # endif
  47
  48     OPT_SECTION("Input"),
  49     {"in", OPT_IN, '<', "Input file"},
  50     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  51
  52     OPT_SECTION("Output"),
  53     {"out", OPT_OUT, '>', "Output file"},
  54     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  55     {"text", OPT_TEXT, '-', "Print as text"},
  56     {"C", OPT_C, '-', "Output C code"},
  57     {"noout", OPT_NOOUT, '-', "No output"},
  58     {"verbose", OPT_VERBOSE, '-', "Verbose output"},
  59     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
  60
  61     OPT_R_OPTIONS,
  62
  63     OPT_PARAMETERS(),
  64     {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
  65     {NULL}
  66 };
  67
  68 int dsaparam_main(int argc, char **argv)
  69 {
  70     ENGINE *e = NULL;
  71     DSA *dsa = NULL;
  72     BIO *in = NULL, *out = NULL;
  73     BN_GENCB *cb = NULL;
  74     int numbits = -1, num = 0, genkey = 0;
  75     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  76     int ret = 1, i, text = 0, private = 0;
  77     char *infile = NULL, *outfile = NULL, *prog;
  78     OPTION_CHOICE o;
  79
  80     prog = opt_init(argc, argv, dsaparam_options);
  81     while ((o = opt_next()) != OPT_EOF) {
  82         switch (o) {
  83         case OPT_EOF:
  84         case OPT_ERR:
  85  opthelp:
  86             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  87             goto end;
  88         case OPT_HELP:
  89             opt_help(dsaparam_options);
  90             ret = 0;
  91             goto end;
  92         case OPT_INFORM:
  93             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  94                 goto opthelp;
  95             break;
  96         case OPT_IN:
  97             infile = opt_arg();
  98             break;
  99         case OPT_OUTFORM:
 100             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 101                 goto opthelp;
 102             break;
 103         case OPT_OUT:
 104             outfile = opt_arg();
 105             break;
 106         case OPT_ENGINE:
 107             e = setup_engine(opt_arg(), 0);
 108             break;
 109         case OPT_TEXT:
 110             text = 1;
 111             break;
 112         case OPT_C:
 113             C = 1;
 114             break;
 115         case OPT_GENKEY:
 116             genkey = 1;
 117             break;
 118         case OPT_R_CASES:
 119             if (!opt_rand(o))
 120                 goto end;
 121             break;
 122         case OPT_NOOUT:
 123             noout = 1;
 124             break;
 125         case OPT_VERBOSE:
 126             verbose = 1;
 127             break;
 128         }
 129     }
 130     argc = opt_num_rest();
 131     argv = opt_rest();
 132
 133     if (argc == 1) {
 134         if (!opt_int(argv[0], &num) || num < 0)
 135             goto end;
 136         /* generate a key */
 137         numbits = num;
 138     }
 139     private = genkey ? 1 : 0;
 140
 141     in = bio_open_default(infile, 'r', informat);
 142     if (in == NULL)
 143         goto end;
 144     out = bio_open_owner(outfile, outformat, private);
 145     if (out == NULL)
 146         goto end;
 147
 148     if (numbits > 0) {
 149         if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
 150             BIO_printf(bio_err,
 151                        "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
 152                        "         Your key size is %d! Larger key size may behave not as expected.\n",
 153                        OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
 154
 155         cb = BN_GENCB_new();
 156         if (cb == NULL) {
 157             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 158             goto end;
 159         }
 160         BN_GENCB_set(cb, dsa_cb, bio_err);
 161         dsa = DSA_new();
 162         if (dsa == NULL) {
 163             BIO_printf(bio_err, "Error allocating DSA object\n");
 164             goto end;
 165         }
 166         if (verbose) {
 167             BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 168                        num);
 169             BIO_printf(bio_err, "This could take some time\n");
 170         }
 171         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 172             ERR_print_errors(bio_err);
 173             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 174             goto end;
 175         }
 176     } else if (informat == FORMAT_ASN1) {
 177         dsa = d2i_DSAparams_bio(in, NULL);
 178     } else {
 179         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 180     }
 181     if (dsa == NULL) {
 182         BIO_printf(bio_err, "unable to load DSA parameters\n");
 183         ERR_print_errors(bio_err);
 184         goto end;
 185     }
 186
 187     if (text) {
 188         DSAparams_print(out, dsa);
 189     }
 190
 191     if (C) {
 192         const BIGNUM *p = NULL, *q = NULL, *g = NULL;
 193         unsigned char *data;
 194         int len, bits_p;
 195
 196         DSA_get0_pqg(dsa, &p, &q, &g);
 197         len = BN_num_bytes(p);
 198         bits_p = BN_num_bits(p);
 199
 200         data = app_malloc(len + 20, "BN space");
 201
 202         BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
 203         print_bignum_var(bio_out, p, "dsap", bits_p, data);
 204         print_bignum_var(bio_out, q, "dsaq", bits_p, data);
 205         print_bignum_var(bio_out, g, "dsag", bits_p, data);
 206         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 207                             "    BIGNUM *p, *q, *g;\n"
 208                             "\n");
 209         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 210                             "        return NULL;\n");
 211         BIO_printf(bio_out, "    if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
 212                    bits_p, bits_p);
 213         BIO_printf(bio_out, "                           q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
 214                    bits_p, bits_p);
 215         BIO_printf(bio_out, "                           g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
 216                    bits_p, bits_p);
 217         BIO_printf(bio_out, "        DSA_free(dsa);\n"
 218                             "        BN_free(p);\n"
 219                             "        BN_free(q);\n"
 220                             "        BN_free(g);\n"
 221                             "        return NULL;\n"
 222                             "    }\n"
 223                             "    return dsa;\n}\n");
 224         OPENSSL_free(data);
 225     }
 226
 227     if (outformat == FORMAT_ASN1 && genkey)
 228         noout = 1;
 229
 230     if (!noout) {
 231         if (outformat == FORMAT_ASN1)
 232             i = i2d_DSAparams_bio(out, dsa);
 233         else
 234             i = PEM_write_bio_DSAparams(out, dsa);
 235         if (!i) {
 236             BIO_printf(bio_err, "unable to write DSA parameters\n");
 237             ERR_print_errors(bio_err);
 238             goto end;
 239         }
 240     }
 241     if (genkey) {
 242         DSA *dsakey;
 243
 244         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 245             goto end;
 246         if (!DSA_generate_key(dsakey)) {
 247             ERR_print_errors(bio_err);
 248             DSA_free(dsakey);
 249             goto end;
 250         }
 251         assert(private);
 252         if (outformat == FORMAT_ASN1)
 253             i = i2d_DSAPrivateKey_bio(out, dsakey);
 254         else
 255             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 256                                             NULL);
 257         DSA_free(dsakey);
 258     }
 259     ret = 0;
 260  end:
 261     BN_GENCB_free(cb);
 262     BIO_free(in);
 263     BIO_free_all(out);
 264     DSA_free(dsa);
 265     release_engine(e);
 266     return ret;
 267 }
 268
 269 static int dsa_cb(int p, int n, BN_GENCB *cb)
 270 {
 271     static const char symbols[] = ".+*\n";
 272     char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
 273
 274     if (!verbose)
 275         return 1;
 276
 277     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 278     (void)BIO_flush(BN_GENCB_get_arg(cb));
 279     return 1;
 280 }
 281 #endif