apps/dsaparam.c

   1 /*
   2  * Copyright 1995-2020 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
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <time.h>
  15 #include <string.h>
  16 #include "apps.h"
  17 #include "progs.h"
  18 #include <openssl/bio.h>
  19 #include <openssl/err.h>
  20 #include <openssl/bn.h>
  21 #include <openssl/dsa.h>
  22 #include <openssl/x509.h>
  23 #include <openssl/pem.h>
  24
  25 static int verbose = 0;
  26
  27 static int gendsa_cb(EVP_PKEY_CTX *ctx);
  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_VERBOSE,
  33     OPT_R_ENUM, OPT_PROV_ENUM
  34 } OPTION_CHOICE;
  35
  36 const OPTIONS dsaparam_options[] = {
  37     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
  38
  39     OPT_SECTION("General"),
  40     {"help", OPT_HELP, '-', "Display this summary"},
  41 #ifndef OPENSSL_NO_ENGINE
  42     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  43 #endif
  44
  45     OPT_SECTION("Input"),
  46     {"in", OPT_IN, '<', "Input file"},
  47     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  48
  49     OPT_SECTION("Output"),
  50     {"out", OPT_OUT, '>', "Output file"},
  51     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  52     {"text", OPT_TEXT, '-', "Print as text"},
  53     {"C", OPT_C, '-', "Output C code"},
  54     {"noout", OPT_NOOUT, '-', "No output"},
  55     {"verbose", OPT_VERBOSE, '-', "Verbose output"},
  56     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
  57
  58     OPT_R_OPTIONS,
  59     OPT_PROV_OPTIONS,
  60
  61     OPT_PARAMETERS(),
  62     {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
  63     {NULL}
  64 };
  65
  66 int dsaparam_main(int argc, char **argv)
  67 {
  68     ENGINE *e = NULL;
  69     BIO *out = NULL;
  70     EVP_PKEY *params = NULL, *pkey = NULL;
  71     EVP_PKEY_CTX *ctx = NULL;
  72     int numbits = -1, num = 0, genkey = 0;
  73     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  74     int ret = 1, i, text = 0, private = 0;
  75     char *infile = NULL, *outfile = NULL, *prog;
  76     OPTION_CHOICE o;
  77
  78     prog = opt_init(argc, argv, dsaparam_options);
  79     while ((o = opt_next()) != OPT_EOF) {
  80         switch (o) {
  81         case OPT_EOF:
  82         case OPT_ERR:
  83  opthelp:
  84             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  85             goto end;
  86         case OPT_HELP:
  87             opt_help(dsaparam_options);
  88             ret = 0;
  89             goto end;
  90         case OPT_INFORM:
  91             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  92                 goto opthelp;
  93             break;
  94         case OPT_IN:
  95             infile = opt_arg();
  96             break;
  97         case OPT_OUTFORM:
  98             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
  99                 goto opthelp;
 100             break;
 101         case OPT_OUT:
 102             outfile = opt_arg();
 103             break;
 104         case OPT_ENGINE:
 105             e = setup_engine(opt_arg(), 0);
 106             break;
 107         case OPT_TEXT:
 108             text = 1;
 109             break;
 110         case OPT_C:
 111             C = 1;
 112             break;
 113         case OPT_GENKEY:
 114             genkey = 1;
 115             break;
 116         case OPT_R_CASES:
 117             if (!opt_rand(o))
 118                 goto end;
 119             break;
 120         case OPT_PROV_CASES:
 121             if (!opt_provider(o))
 122                 goto end;
 123             break;
 124         case OPT_NOOUT:
 125             noout = 1;
 126             break;
 127         case OPT_VERBOSE:
 128             verbose = 1;
 129             break;
 130         }
 131     }
 132     argc = opt_num_rest();
 133     argv = opt_rest();
 134
 135     if (argc == 1) {
 136         if (!opt_int(argv[0], &num) || num < 0)
 137             goto end;
 138         /* generate a key */
 139         numbits = num;
 140     }
 141     private = genkey ? 1 : 0;
 142
 143     out = bio_open_owner(outfile, outformat, private);
 144     if (out == NULL)
 145         goto end;
 146
 147     ctx = EVP_PKEY_CTX_new_from_name(NULL, "DSA", NULL);
 148     if (ctx == NULL) {
 149         BIO_printf(bio_err,
 150                    "Error, DSA parameter generation context allocation failed\n");
 151         goto end;
 152     }
 153     if (numbits > 0) {
 154         if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
 155             BIO_printf(bio_err,
 156                        "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
 157                        "         Your key size is %d! Larger key size may behave not as expected.\n",
 158                        OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
 159
 160         EVP_PKEY_CTX_set_cb(ctx, gendsa_cb);
 161         EVP_PKEY_CTX_set_app_data(ctx, bio_err);
 162         if (verbose) {
 163             BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 164                        num);
 165             BIO_printf(bio_err, "This could take some time\n");
 166         }
 167         if (EVP_PKEY_paramgen_init(ctx) <= 0) {
 168             BIO_printf(bio_err,
 169                        "Error, DSA key generation paramgen init failed\n");
 170             goto end;
 171         }
 172         if (!EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num)) {
 173             BIO_printf(bio_err,
 174                        "Error, DSA key generation setting bit length failed\n");
 175             goto end;
 176         }
 177         if (EVP_PKEY_paramgen(ctx, &params) <= 0) {
 178             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 179             goto end;
 180         }
 181     } else {
 182         params = load_keyparams(infile, 1, "DSA", "DSA parameters");
 183     }
 184     if (params == NULL) {
 185         /* Error message should already have been displayed */
 186         goto end;
 187     }
 188
 189     if (text) {
 190         EVP_PKEY_print_params(out, params, 0, NULL);
 191     }
 192
 193     if (C) {
 194         BIGNUM *p = NULL, *q = NULL, *g = NULL;
 195         unsigned char *data;
 196         int len, bits_p;
 197
 198         EVP_PKEY_get_bn_param(params, "p", &p);
 199         EVP_PKEY_get_bn_param(params, "q", &q);
 200         EVP_PKEY_get_bn_param(params, "g", &g);
 201         len = BN_num_bytes(p);
 202         bits_p = BN_num_bits(p);
 203
 204         data = app_malloc(len + 20, "BN space");
 205
 206         BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
 207         print_bignum_var(bio_out, p, "dsap", bits_p, data);
 208         print_bignum_var(bio_out, q, "dsaq", bits_p, data);
 209         print_bignum_var(bio_out, g, "dsag", bits_p, data);
 210         BN_free(p);
 211         BN_free(q);
 212         BN_free(g);
 213         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 214                             "    BIGNUM *p, *q, *g;\n"
 215                             "\n");
 216         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 217                             "        return NULL;\n");
 218         BIO_printf(bio_out, "    if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
 219                    bits_p, bits_p);
 220         BIO_printf(bio_out, "                           q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
 221                    bits_p, bits_p);
 222         BIO_printf(bio_out, "                           g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
 223                    bits_p, bits_p);
 224         BIO_printf(bio_out, "        DSA_free(dsa);\n"
 225                             "        BN_free(p);\n"
 226                             "        BN_free(q);\n"
 227                             "        BN_free(g);\n"
 228                             "        return NULL;\n"
 229                             "    }\n"
 230                             "    return dsa;\n}\n");
 231         OPENSSL_free(data);
 232     }
 233
 234     if (outformat == FORMAT_ASN1 && genkey)
 235         noout = 1;
 236
 237     if (!noout) {
 238         if (outformat == FORMAT_ASN1)
 239             i = i2d_KeyParams_bio(out, params);
 240         else
 241             i = PEM_write_bio_Parameters(out, params);
 242         if (!i) {
 243             BIO_printf(bio_err, "Error, unable to write DSA parameters\n");
 244             goto end;
 245         }
 246     }
 247     if (genkey) {
 248         EVP_PKEY_CTX_free(ctx);
 249         ctx = EVP_PKEY_CTX_new(params, NULL);
 250         if (ctx == NULL) {
 251             BIO_printf(bio_err,
 252                        "Error, DSA key generation context allocation failed\n");
 253             goto end;
 254         }
 255         if (!EVP_PKEY_keygen_init(ctx)) {
 256             BIO_printf(bio_err,
 257                        "Error, unable to initialise for key generation\n");
 258             goto end;
 259         }
 260         if (!EVP_PKEY_keygen(ctx, &pkey)) {
 261             BIO_printf(bio_err, "Error, unable to generate key\n");
 262             goto end;
 263         }
 264         assert(private);
 265         if (outformat == FORMAT_ASN1)
 266             i = i2d_PrivateKey_bio(out, pkey);
 267         else
 268             i = PEM_write_bio_PrivateKey(out, pkey, NULL, NULL, 0, NULL, NULL);
 269     }
 270     ret = 0;
 271  end:
 272     if (ret != 0)
 273         ERR_print_errors(bio_err);
 274     BIO_free_all(out);
 275     EVP_PKEY_CTX_free(ctx);
 276     EVP_PKEY_free(pkey);
 277     EVP_PKEY_free(params);
 278     release_engine(e);
 279     return ret;
 280 }
 281
 282 static int gendsa_cb(EVP_PKEY_CTX *ctx)
 283 {
 284     static const char symbols[] = ".+*\n";
 285     int p;
 286     char c;
 287     BIO *b;
 288
 289     if (!verbose)
 290         return 1;
 291
 292     b = EVP_PKEY_CTX_get_app_data(ctx);
 293     p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
 294     c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
 295
 296     BIO_write(b, &c, 1);
 297     (void)BIO_flush(b);
 298     return 1;
 299 }