apps/dsa.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 <string.h>
  18 # include <time.h>
  19 # include "apps.h"
  20 # include "progs.h"
  21 # include <openssl/bio.h>
  22 # include <openssl/err.h>
  23 # include <openssl/dsa.h>
  24 # include <openssl/evp.h>
  25 # include <openssl/x509.h>
  26 # include <openssl/pem.h>
  27 # include <openssl/bn.h>
  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_ENGINE,
  32     /* Do not change the order here; see case statements below */
  33     OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
  34     OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
  35     OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT
  36 } OPTION_CHOICE;
  37
  38 const OPTIONS dsa_options[] = {
  39     OPT_SECTION("General"),
  40     {"help", OPT_HELP, '-', "Display this summary"},
  41     {"", OPT_CIPHER, '-', "Any supported cipher"},
  42 # ifndef OPENSSL_NO_RC4
  43     {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
  44     {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
  45     {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
  46 # endif
  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, 's', "Input key"},
  53     {"inform", OPT_INFORM, 'f', "Input format, DER PEM PVK"},
  54     {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
  55     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  56
  57     OPT_SECTION("Output"),
  58     {"out", OPT_OUT, '>', "Output file"},
  59     {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
  60     {"noout", OPT_NOOUT, '-', "Don't print key out"},
  61     {"text", OPT_TEXT, '-', "Print the key in text"},
  62     {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
  63     {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
  64     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  65
  66     {NULL}
  67 };
  68
  69 int dsa_main(int argc, char **argv)
  70 {
  71     BIO *out = NULL;
  72     DSA *dsa = NULL;
  73     ENGINE *e = NULL;
  74     const EVP_CIPHER *enc = NULL;
  75     char *infile = NULL, *outfile = NULL, *prog;
  76     char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
  77     OPTION_CHOICE o;
  78     int informat = FORMAT_PEM, outformat = FORMAT_PEM, text = 0, noout = 0;
  79     int i, modulus = 0, pubin = 0, pubout = 0, ret = 1;
  80 # ifndef OPENSSL_NO_RC4
  81     int pvk_encr = 2;
  82 # endif
  83     int private = 0;
  84     EVP_PKEY *pkey = NULL;
  85
  86     prog = opt_init(argc, argv, dsa_options);
  87     while ((o = opt_next()) != OPT_EOF) {
  88         switch (o) {
  89         case OPT_EOF:
  90         case OPT_ERR:
  91  opthelp:
  92             ret = 0;
  93             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  94             goto end;
  95         case OPT_HELP:
  96             opt_help(dsa_options);
  97             ret = 0;
  98             goto end;
  99         case OPT_INFORM:
 100             if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
 101                 goto opthelp;
 102             break;
 103         case OPT_IN:
 104             infile = opt_arg();
 105             break;
 106         case OPT_OUTFORM:
 107             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
 108                 goto opthelp;
 109             break;
 110         case OPT_OUT:
 111             outfile = opt_arg();
 112             break;
 113         case OPT_ENGINE:
 114             e = setup_engine(opt_arg(), 0);
 115             break;
 116         case OPT_PASSIN:
 117             passinarg = opt_arg();
 118             break;
 119         case OPT_PASSOUT:
 120             passoutarg = opt_arg();
 121             break;
 122         case OPT_PVK_STRONG:    /* pvk_encr:= 2 */
 123         case OPT_PVK_WEAK:      /* pvk_encr:= 1 */
 124         case OPT_PVK_NONE:      /* pvk_encr:= 0 */
 125 #ifndef OPENSSL_NO_RC4
 126             pvk_encr = (o - OPT_PVK_NONE);
 127 #endif
 128             break;
 129         case OPT_NOOUT:
 130             noout = 1;
 131             break;
 132         case OPT_TEXT:
 133             text = 1;
 134             break;
 135         case OPT_MODULUS:
 136             modulus = 1;
 137             break;
 138         case OPT_PUBIN:
 139             pubin = 1;
 140             break;
 141         case OPT_PUBOUT:
 142             pubout = 1;
 143             break;
 144         case OPT_CIPHER:
 145             if (!opt_cipher(opt_unknown(), &enc))
 146                 goto end;
 147             break;
 148         }
 149     }
 150     argc = opt_num_rest();
 151     if (argc != 0)
 152         goto opthelp;
 153
 154     private = pubin || pubout ? 0 : 1;
 155     if (text && !pubin)
 156         private = 1;
 157
 158     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 159         BIO_printf(bio_err, "Error getting passwords\n");
 160         goto end;
 161     }
 162
 163     BIO_printf(bio_err, "read DSA key\n");
 164     if (pubin)
 165         pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");
 166     else
 167         pkey = load_key(infile, informat, 1, passin, e, "Private Key");
 168
 169     if (pkey != NULL)
 170         dsa = EVP_PKEY_get1_DSA(pkey);
 171
 172     if (dsa == NULL) {
 173         BIO_printf(bio_err, "unable to load Key\n");
 174         ERR_print_errors(bio_err);
 175         goto end;
 176     }
 177
 178     out = bio_open_owner(outfile, outformat, private);
 179     if (out == NULL)
 180         goto end;
 181
 182     if (text) {
 183         assert(pubin || private);
 184         if (!EVP_PKEY_print_private(out, pkey, 0, NULL)) {
 185             perror(outfile);
 186             ERR_print_errors(bio_err);
 187             goto end;
 188         }
 189     }
 190
 191     if (modulus) {
 192         const BIGNUM *pub_key = NULL;
 193         DSA_get0_key(dsa, &pub_key, NULL);
 194         BIO_printf(out, "Public Key=");
 195         BN_print(out, pub_key);
 196         BIO_printf(out, "\n");
 197     }
 198
 199     if (noout) {
 200         ret = 0;
 201         goto end;
 202     }
 203     BIO_printf(bio_err, "writing DSA key\n");
 204     if (outformat == FORMAT_ASN1) {
 205         if (pubin || pubout) {
 206             i = i2d_DSA_PUBKEY_bio(out, dsa);
 207         } else {
 208             assert(private);
 209             i = i2d_DSAPrivateKey_bio(out, dsa);
 210         }
 211     } else if (outformat == FORMAT_PEM) {
 212         if (pubin || pubout) {
 213             i = PEM_write_bio_DSA_PUBKEY(out, dsa);
 214         } else {
 215             assert(private);
 216             i = PEM_write_bio_DSAPrivateKey(out, dsa, enc,
 217                                             NULL, 0, NULL, passout);
 218         }
 219 # ifndef OPENSSL_NO_RSA
 220     } else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
 221         EVP_PKEY *pk;
 222         pk = EVP_PKEY_new();
 223         if (pk == NULL)
 224            goto end;
 225
 226         EVP_PKEY_set1_DSA(pk, dsa);
 227         if (outformat == FORMAT_PVK) {
 228             if (pubin) {
 229                 BIO_printf(bio_err, "PVK form impossible with public key input\n");
 230                 EVP_PKEY_free(pk);
 231                 goto end;
 232             }
 233             assert(private);
 234 #  ifdef OPENSSL_NO_RC4
 235             BIO_printf(bio_err, "PVK format not supported\n");
 236             EVP_PKEY_free(pk);
 237             goto end;
 238 #  else
 239             i = i2b_PVK_bio(out, pk, pvk_encr, 0, passout);
 240 #  endif
 241         } else if (pubin || pubout) {
 242             i = i2b_PublicKey_bio(out, pk);
 243         } else {
 244             assert(private);
 245             i = i2b_PrivateKey_bio(out, pk);
 246         }
 247         EVP_PKEY_free(pk);
 248 # endif
 249     } else {
 250         BIO_printf(bio_err, "bad output format specified for outfile\n");
 251         goto end;
 252     }
 253     if (i <= 0) {
 254         BIO_printf(bio_err, "unable to write private key\n");
 255         ERR_print_errors(bio_err);
 256         goto end;
 257     }
 258     ret = 0;
 259  end:
 260     EVP_PKEY_free(pkey);
 261     BIO_free_all(out);
 262     DSA_free(dsa);
 263     release_engine(e);
 264     OPENSSL_free(passin);
 265     OPENSSL_free(passout);
 266     return ret;
 267 }
 268 #endif