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 /* We need to use some deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include <openssl/opensslconf.h>
  14 #if defined(OPENSSL_NO_DSA) || defined(OPENSSL_NO_DEPRECATED_3_0)
  15 NON_EMPTY_TRANSLATION_UNIT
  16 #else
  17
  18 # include <stdio.h>
  19 # include <stdlib.h>
  20 # include <time.h>
  21 # include <string.h>
  22 # include "apps.h"
  23 # include "progs.h"
  24 # include <openssl/bio.h>
  25 # include <openssl/err.h>
  26 # include <openssl/bn.h>
  27 # include <openssl/dsa.h>
  28 # include <openssl/x509.h>
  29 # include <openssl/pem.h>
  30
  31 static int verbose = 0;
  32
  33 static int dsa_cb(int p, int n, BN_GENCB *cb);
  34
  35 typedef enum OPTION_choice {
  36     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  37     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  38     OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
  39     OPT_R_ENUM
  40 } OPTION_CHOICE;
  41
  42 const OPTIONS dsaparam_options[] = {
  43     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
  44
  45     OPT_SECTION("General"),
  46     {"help", OPT_HELP, '-', "Display this summary"},
  47 # ifndef OPENSSL_NO_ENGINE
  48     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  49 # endif
  50
  51     OPT_SECTION("Input"),
  52     {"in", OPT_IN, '<', "Input file"},
  53     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  54
  55     OPT_SECTION("Output"),
  56     {"out", OPT_OUT, '>', "Output file"},
  57     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  58     {"text", OPT_TEXT, '-', "Print as text"},
  59     {"C", OPT_C, '-', "Output C code"},
  60     {"noout", OPT_NOOUT, '-', "No output"},
  61     {"verbose", OPT_VERBOSE, '-', "Verbose output"},
  62     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
  63
  64     OPT_R_OPTIONS,
  65
  66     OPT_PARAMETERS(),
  67     {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
  68     {NULL}
  69 };
  70
  71 int dsaparam_main(int argc, char **argv)
  72 {
  73     ENGINE *e = NULL;
  74     DSA *dsa = NULL;
  75     BIO *in = NULL, *out = NULL;
  76     BN_GENCB *cb = NULL;
  77     int numbits = -1, num = 0, genkey = 0;
  78     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  79     int ret = 1, i, text = 0, private = 0;
  80     char *infile = NULL, *outfile = NULL, *prog;
  81     OPTION_CHOICE o;
  82
  83     prog = opt_init(argc, argv, dsaparam_options);
  84     while ((o = opt_next()) != OPT_EOF) {
  85         switch (o) {
  86         case OPT_EOF:
  87         case OPT_ERR:
  88  opthelp:
  89             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  90             goto end;
  91         case OPT_HELP:
  92             opt_help(dsaparam_options);
  93             ret = 0;
  94             goto end;
  95         case OPT_INFORM:
  96             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  97                 goto opthelp;
  98             break;
  99         case OPT_IN:
 100             infile = opt_arg();
 101             break;
 102         case OPT_OUTFORM:
 103             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 104                 goto opthelp;
 105             break;
 106         case OPT_OUT:
 107             outfile = opt_arg();
 108             break;
 109         case OPT_ENGINE:
 110             e = setup_engine(opt_arg(), 0);
 111             break;
 112         case OPT_TEXT:
 113             text = 1;
 114             break;
 115         case OPT_C:
 116             C = 1;
 117             break;
 118         case OPT_GENKEY:
 119             genkey = 1;
 120             break;
 121         case OPT_R_CASES:
 122             if (!opt_rand(o))
 123                 goto end;
 124             break;
 125         case OPT_NOOUT:
 126             noout = 1;
 127             break;
 128         case OPT_VERBOSE:
 129             verbose = 1;
 130             break;
 131         }
 132     }
 133     argc = opt_num_rest();
 134     argv = opt_rest();
 135
 136     if (argc == 1) {
 137         if (!opt_int(argv[0], &num) || num < 0)
 138             goto end;
 139         /* generate a key */
 140         numbits = num;
 141     }
 142     private = genkey ? 1 : 0;
 143
 144     in = bio_open_default(infile, 'r', informat);
 145     if (in == NULL)
 146         goto end;
 147     out = bio_open_owner(outfile, outformat, private);
 148     if (out == NULL)
 149         goto end;
 150
 151     if (numbits > 0) {
 152         if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
 153             BIO_printf(bio_err,
 154                        "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
 155                        "         Your key size is %d! Larger key size may behave not as expected.\n",
 156                        OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
 157
 158         cb = BN_GENCB_new();
 159         if (cb == NULL) {
 160             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 161             goto end;
 162         }
 163         BN_GENCB_set(cb, dsa_cb, bio_err);
 164         dsa = DSA_new();
 165         if (dsa == NULL) {
 166             BIO_printf(bio_err, "Error allocating DSA object\n");
 167             goto end;
 168         }
 169         if (verbose) {
 170             BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 171                        num);
 172             BIO_printf(bio_err, "This could take some time\n");
 173         }
 174         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 175             ERR_print_errors(bio_err);
 176             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 177             goto end;
 178         }
 179     } else if (informat == FORMAT_ASN1) {
 180         dsa = d2i_DSAparams_bio(in, NULL);
 181     } else {
 182         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 183     }
 184     if (dsa == NULL) {
 185         BIO_printf(bio_err, "unable to load DSA parameters\n");
 186         ERR_print_errors(bio_err);
 187         goto end;
 188     }
 189
 190     if (text) {
 191         DSAparams_print(out, dsa);
 192     }
 193
 194     if (C) {
 195         const BIGNUM *p = NULL, *q = NULL, *g = NULL;
 196         unsigned char *data;
 197         int len, bits_p;
 198
 199         DSA_get0_pqg(dsa, &p, &q, &g);
 200         len = BN_num_bytes(p);
 201         bits_p = BN_num_bits(p);
 202
 203         data = app_malloc(len + 20, "BN space");
 204
 205         BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
 206         print_bignum_var(bio_out, p, "dsap", bits_p, data);
 207         print_bignum_var(bio_out, q, "dsaq", bits_p, data);
 208         print_bignum_var(bio_out, g, "dsag", bits_p, data);
 209         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 210                             "    BIGNUM *p, *q, *g;\n"
 211                             "\n");
 212         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 213                             "        return NULL;\n");
 214         BIO_printf(bio_out, "    if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
 215                    bits_p, bits_p);
 216         BIO_printf(bio_out, "                           q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
 217                    bits_p, bits_p);
 218         BIO_printf(bio_out, "                           g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
 219                    bits_p, bits_p);
 220         BIO_printf(bio_out, "        DSA_free(dsa);\n"
 221                             "        BN_free(p);\n"
 222                             "        BN_free(q);\n"
 223                             "        BN_free(g);\n"
 224                             "        return NULL;\n"
 225                             "    }\n"
 226                             "    return dsa;\n}\n");
 227         OPENSSL_free(data);
 228     }
 229
 230     if (outformat == FORMAT_ASN1 && genkey)
 231         noout = 1;
 232
 233     if (!noout) {
 234         if (outformat == FORMAT_ASN1)
 235             i = i2d_DSAparams_bio(out, dsa);
 236         else
 237             i = PEM_write_bio_DSAparams(out, dsa);
 238         if (!i) {
 239             BIO_printf(bio_err, "unable to write DSA parameters\n");
 240             ERR_print_errors(bio_err);
 241             goto end;
 242         }
 243     }
 244     if (genkey) {
 245         DSA *dsakey;
 246
 247         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 248             goto end;
 249         if (!DSA_generate_key(dsakey)) {
 250             ERR_print_errors(bio_err);
 251             DSA_free(dsakey);
 252             goto end;
 253         }
 254         assert(private);
 255         if (outformat == FORMAT_ASN1)
 256             i = i2d_DSAPrivateKey_bio(out, dsakey);
 257         else
 258             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 259                                             NULL);
 260         DSA_free(dsakey);
 261     }
 262     ret = 0;
 263  end:
 264     BN_GENCB_free(cb);
 265     BIO_free(in);
 266     BIO_free_all(out);
 267     DSA_free(dsa);
 268     release_engine(e);
 269     return ret;
 270 }
 271
 272 static int dsa_cb(int p, int n, BN_GENCB *cb)
 273 {
 274     static const char symbols[] = ".+*\n";
 275     char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
 276
 277     if (!verbose)
 278         return 1;
 279
 280     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 281     (void)BIO_flush(BN_GENCB_get_arg(cb));
 282     return 1;
 283 }
 284 #endif