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 #ifdef OPENSSL_NO_DSA
  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, OPT_PROV_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     OPT_PROV_OPTIONS,
  66
  67     OPT_PARAMETERS(),
  68     {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
  69     {NULL}
  70 };
  71
  72 int dsaparam_main(int argc, char **argv)
  73 {
  74     ENGINE *e = NULL;
  75     DSA *dsa = NULL;
  76     BIO *in = NULL, *out = NULL;
  77     BN_GENCB *cb = NULL;
  78     int numbits = -1, num = 0, genkey = 0;
  79     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  80     int ret = 1, i, text = 0, private = 0;
  81     char *infile = NULL, *outfile = NULL, *prog;
  82     OPTION_CHOICE o;
  83
  84     prog = opt_init(argc, argv, dsaparam_options);
  85     while ((o = opt_next()) != OPT_EOF) {
  86         switch (o) {
  87         case OPT_EOF:
  88         case OPT_ERR:
  89  opthelp:
  90             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  91             goto end;
  92         case OPT_HELP:
  93             opt_help(dsaparam_options);
  94             ret = 0;
  95             goto end;
  96         case OPT_INFORM:
  97             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  98                 goto opthelp;
  99             break;
 100         case OPT_IN:
 101             infile = opt_arg();
 102             break;
 103         case OPT_OUTFORM:
 104             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 105                 goto opthelp;
 106             break;
 107         case OPT_OUT:
 108             outfile = opt_arg();
 109             break;
 110         case OPT_ENGINE:
 111             e = setup_engine(opt_arg(), 0);
 112             break;
 113         case OPT_TEXT:
 114             text = 1;
 115             break;
 116         case OPT_C:
 117             C = 1;
 118             break;
 119         case OPT_GENKEY:
 120             genkey = 1;
 121             break;
 122         case OPT_R_CASES:
 123             if (!opt_rand(o))
 124                 goto end;
 125             break;
 126         case OPT_PROV_CASES:
 127             if (!opt_provider(o))
 128                 goto end;
 129             break;
 130         case OPT_NOOUT:
 131             noout = 1;
 132             break;
 133         case OPT_VERBOSE:
 134             verbose = 1;
 135             break;
 136         }
 137     }
 138     argc = opt_num_rest();
 139     argv = opt_rest();
 140
 141     if (argc == 1) {
 142         if (!opt_int(argv[0], &num) || num < 0)
 143             goto end;
 144         /* generate a key */
 145         numbits = num;
 146     }
 147     private = genkey ? 1 : 0;
 148
 149     in = bio_open_default(infile, 'r', informat);
 150     if (in == NULL)
 151         goto end;
 152     out = bio_open_owner(outfile, outformat, private);
 153     if (out == NULL)
 154         goto end;
 155
 156     if (numbits > 0) {
 157         if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
 158             BIO_printf(bio_err,
 159                        "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
 160                        "         Your key size is %d! Larger key size may behave not as expected.\n",
 161                        OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
 162
 163         cb = BN_GENCB_new();
 164         if (cb == NULL) {
 165             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 166             goto end;
 167         }
 168         BN_GENCB_set(cb, dsa_cb, bio_err);
 169         dsa = DSA_new();
 170         if (dsa == NULL) {
 171             BIO_printf(bio_err, "Error allocating DSA object\n");
 172             goto end;
 173         }
 174         if (verbose) {
 175             BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 176                        num);
 177             BIO_printf(bio_err, "This could take some time\n");
 178         }
 179         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 180             ERR_print_errors(bio_err);
 181             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 182             goto end;
 183         }
 184     } else if (informat == FORMAT_ASN1) {
 185         dsa = d2i_DSAparams_bio(in, NULL);
 186     } else {
 187         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 188     }
 189     if (dsa == NULL) {
 190         BIO_printf(bio_err, "unable to load DSA parameters\n");
 191         ERR_print_errors(bio_err);
 192         goto end;
 193     }
 194
 195     if (text) {
 196         DSAparams_print(out, dsa);
 197     }
 198
 199     if (C) {
 200         const BIGNUM *p = NULL, *q = NULL, *g = NULL;
 201         unsigned char *data;
 202         int len, bits_p;
 203
 204         DSA_get0_pqg(dsa, &p, &q, &g);
 205         len = BN_num_bytes(p);
 206         bits_p = BN_num_bits(p);
 207
 208         data = app_malloc(len + 20, "BN space");
 209
 210         BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
 211         print_bignum_var(bio_out, p, "dsap", bits_p, data);
 212         print_bignum_var(bio_out, q, "dsaq", bits_p, data);
 213         print_bignum_var(bio_out, g, "dsag", bits_p, data);
 214         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 215                             "    BIGNUM *p, *q, *g;\n"
 216                             "\n");
 217         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 218                             "        return NULL;\n");
 219         BIO_printf(bio_out, "    if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
 220                    bits_p, bits_p);
 221         BIO_printf(bio_out, "                           q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
 222                    bits_p, bits_p);
 223         BIO_printf(bio_out, "                           g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
 224                    bits_p, bits_p);
 225         BIO_printf(bio_out, "        DSA_free(dsa);\n"
 226                             "        BN_free(p);\n"
 227                             "        BN_free(q);\n"
 228                             "        BN_free(g);\n"
 229                             "        return NULL;\n"
 230                             "    }\n"
 231                             "    return dsa;\n}\n");
 232         OPENSSL_free(data);
 233     }
 234
 235     if (outformat == FORMAT_ASN1 && genkey)
 236         noout = 1;
 237
 238     if (!noout) {
 239         if (outformat == FORMAT_ASN1)
 240             i = i2d_DSAparams_bio(out, dsa);
 241         else
 242             i = PEM_write_bio_DSAparams(out, dsa);
 243         if (!i) {
 244             BIO_printf(bio_err, "unable to write DSA parameters\n");
 245             ERR_print_errors(bio_err);
 246             goto end;
 247         }
 248     }
 249     if (genkey) {
 250         DSA *dsakey;
 251
 252         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 253             goto end;
 254         if (!DSA_generate_key(dsakey)) {
 255             ERR_print_errors(bio_err);
 256             DSA_free(dsakey);
 257             goto end;
 258         }
 259         assert(private);
 260         if (outformat == FORMAT_ASN1)
 261             i = i2d_DSAPrivateKey_bio(out, dsakey);
 262         else
 263             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 264                                             NULL);
 265         DSA_free(dsakey);
 266     }
 267     ret = 0;
 268  end:
 269     BN_GENCB_free(cb);
 270     BIO_free(in);
 271     BIO_free_all(out);
 272     DSA_free(dsa);
 273     release_engine(e);
 274     return ret;
 275 }
 276
 277 static int dsa_cb(int p, int n, BN_GENCB *cb)
 278 {
 279     static const char symbols[] = ".+*\n";
 280     char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
 281
 282     if (!verbose)
 283         return 1;
 284
 285     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 286     (void)BIO_flush(BN_GENCB_get_arg(cb));
 287     return 1;
 288 }
 289 #endif