apps/dsaparam.c

   1 /*
   2  * Copyright 1995-2018 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 "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 dsa_cb(int p, int n, BN_GENCB *cb);
  29
  30 typedef enum OPTION_choice {
  31     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  32     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  33     OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_R_ENUM
  34 } OPTION_CHOICE;
  35
  36 const OPTIONS dsaparam_options[] = {
  37     {"help", OPT_HELP, '-', "Display this summary"},
  38     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  39     {"in", OPT_IN, '<', "Input file"},
  40     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  41     {"out", OPT_OUT, '>', "Output file"},
  42     {"text", OPT_TEXT, '-', "Print as text"},
  43     {"C", OPT_C, '-', "Output C code"},
  44     {"noout", OPT_NOOUT, '-', "No output"},
  45     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
  46     OPT_R_OPTIONS,
  47 # ifndef OPENSSL_NO_ENGINE
  48     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  49 # endif
  50     {NULL}
  51 };
  52
  53 int dsaparam_main(int argc, char **argv)
  54 {
  55     ENGINE *e = NULL;
  56     DSA *dsa = NULL;
  57     BIO *in = NULL, *out = NULL;
  58     BN_GENCB *cb = NULL;
  59     int numbits = -1, num = 0, genkey = 0;
  60     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  61     int ret = 1, i, text = 0, private = 0;
  62     char *infile = NULL, *outfile = NULL, *prog;
  63     OPTION_CHOICE o;
  64
  65     prog = opt_init(argc, argv, dsaparam_options);
  66     while ((o = opt_next()) != OPT_EOF) {
  67         switch (o) {
  68         case OPT_EOF:
  69         case OPT_ERR:
  70  opthelp:
  71             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  72             goto end;
  73         case OPT_HELP:
  74             opt_help(dsaparam_options);
  75             ret = 0;
  76             goto end;
  77         case OPT_INFORM:
  78             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  79                 goto opthelp;
  80             break;
  81         case OPT_IN:
  82             infile = opt_arg();
  83             break;
  84         case OPT_OUTFORM:
  85             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
  86                 goto opthelp;
  87             break;
  88         case OPT_OUT:
  89             outfile = opt_arg();
  90             break;
  91         case OPT_ENGINE:
  92             e = setup_engine(opt_arg(), 0);
  93             break;
  94         case OPT_TEXT:
  95             text = 1;
  96             break;
  97         case OPT_C:
  98             C = 1;
  99             break;
 100         case OPT_GENKEY:
 101             genkey = 1;
 102             break;
 103         case OPT_R_CASES:
 104             if (!opt_rand(o))
 105                 goto end;
 106             break;
 107         case OPT_NOOUT:
 108             noout = 1;
 109             break;
 110         }
 111     }
 112     argc = opt_num_rest();
 113     argv = opt_rest();
 114
 115     if (argc == 1) {
 116         if (!opt_int(argv[0], &num) || num < 0)
 117             goto end;
 118         /* generate a key */
 119         numbits = num;
 120     }
 121     private = genkey ? 1 : 0;
 122
 123     in = bio_open_default(infile, 'r', informat);
 124     if (in == NULL)
 125         goto end;
 126     out = bio_open_owner(outfile, outformat, private);
 127     if (out == NULL)
 128         goto end;
 129
 130     if (numbits > 0) {
 131         cb = BN_GENCB_new();
 132         if (cb == NULL) {
 133             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 134             goto end;
 135         }
 136         BN_GENCB_set(cb, dsa_cb, bio_err);
 137         dsa = DSA_new();
 138         if (dsa == NULL) {
 139             BIO_printf(bio_err, "Error allocating DSA object\n");
 140             goto end;
 141         }
 142         BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 143                    num);
 144         BIO_printf(bio_err, "This could take some time\n");
 145         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 146             ERR_print_errors(bio_err);
 147             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 148             goto end;
 149         }
 150     } else if (informat == FORMAT_ASN1) {
 151         dsa = d2i_DSAparams_bio(in, NULL);
 152     } else {
 153         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 154     }
 155     if (dsa == NULL) {
 156         BIO_printf(bio_err, "unable to load DSA parameters\n");
 157         ERR_print_errors(bio_err);
 158         goto end;
 159     }
 160
 161     if (text) {
 162         DSAparams_print(out, dsa);
 163     }
 164
 165     if (C) {
 166         const BIGNUM *p = NULL, *q = NULL, *g = NULL;
 167         unsigned char *data;
 168         int len, bits_p;
 169
 170         DSA_get0_pqg(dsa, &p, &q, &g);
 171         len = BN_num_bytes(p);
 172         bits_p = BN_num_bits(p);
 173
 174         data = app_malloc(len + 20, "BN space");
 175
 176         BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
 177         print_bignum_var(bio_out, p, "dsap", len, data);
 178         print_bignum_var(bio_out, q, "dsaq", len, data);
 179         print_bignum_var(bio_out, g, "dsag", len, data);
 180         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 181                             "\n");
 182         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 183                             "        return NULL;\n");
 184         BIO_printf(bio_out, "    dsa->p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL);\n",
 185                bits_p, bits_p);
 186         BIO_printf(bio_out, "    dsa->q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL);\n",
 187                bits_p, bits_p);
 188         BIO_printf(bio_out, "    dsa->g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL);\n",
 189                bits_p, bits_p);
 190         BIO_printf(bio_out, "    if (!dsa->p || !dsa->q || !dsa->g) {\n"
 191                             "        DSA_free(dsa);\n"
 192                             "        return NULL;\n"
 193                             "    }\n"
 194                             "    return(dsa);\n}\n");
 195         OPENSSL_free(data);
 196     }
 197
 198     if (outformat == FORMAT_ASN1 && genkey)
 199         noout = 1;
 200
 201     if (!noout) {
 202         if (outformat == FORMAT_ASN1)
 203             i = i2d_DSAparams_bio(out, dsa);
 204         else
 205             i = PEM_write_bio_DSAparams(out, dsa);
 206         if (!i) {
 207             BIO_printf(bio_err, "unable to write DSA parameters\n");
 208             ERR_print_errors(bio_err);
 209             goto end;
 210         }
 211     }
 212     if (genkey) {
 213         DSA *dsakey;
 214
 215         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 216             goto end;
 217         if (!DSA_generate_key(dsakey)) {
 218             ERR_print_errors(bio_err);
 219             DSA_free(dsakey);
 220             goto end;
 221         }
 222         assert(private);
 223         if (outformat == FORMAT_ASN1)
 224             i = i2d_DSAPrivateKey_bio(out, dsakey);
 225         else
 226             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 227                                             NULL);
 228         DSA_free(dsakey);
 229     }
 230     ret = 0;
 231  end:
 232     BN_GENCB_free(cb);
 233     BIO_free(in);
 234     BIO_free_all(out);
 235     DSA_free(dsa);
 236     release_engine(e);
 237     return ret;
 238 }
 239
 240 static int dsa_cb(int p, int n, BN_GENCB *cb)
 241 {
 242     char c = '*';
 243
 244     if (p == 0)
 245         c = '.';
 246     if (p == 1)
 247         c = '+';
 248     if (p == 2)
 249         c = '*';
 250     if (p == 3)
 251         c = '\n';
 252     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 253     (void)BIO_flush(BN_GENCB_get_arg(cb));
 254     return 1;
 255 }
 256 #endif