apps/dsa.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 <string.h>
  15 #include <time.h>
  16 #include "apps.h"
  17 #include "progs.h"
  18 #include <openssl/bio.h>
  19 #include <openssl/err.h>
  20 #include <openssl/dsa.h>
  21 #include <openssl/evp.h>
  22 #include <openssl/x509.h>
  23 #include <openssl/pem.h>
  24 #include <openssl/bn.h>
  25
  26 typedef enum OPTION_choice {
  27     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  28     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_ENGINE,
  29     /* Do not change the order here; see case statements below */
  30     OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
  31     OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
  32     OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT,
  33     OPT_PROV_ENUM
  34 } OPTION_CHOICE;
  35
  36 const OPTIONS dsa_options[] = {
  37     OPT_SECTION("General"),
  38     {"help", OPT_HELP, '-', "Display this summary"},
  39     {"", OPT_CIPHER, '-', "Any supported cipher"},
  40 #ifndef OPENSSL_NO_RC4
  41     {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
  42     {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
  43     {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
  44 #endif
  45 #ifndef OPENSSL_NO_ENGINE
  46     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  47 #endif
  48
  49     OPT_SECTION("Input"),
  50     {"in", OPT_IN, 's', "Input key"},
  51     {"inform", OPT_INFORM, 'f', "Input format, DER PEM PVK"},
  52     {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
  53     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  54
  55     OPT_SECTION("Output"),
  56     {"out", OPT_OUT, '>', "Output file"},
  57     {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
  58     {"noout", OPT_NOOUT, '-', "Don't print key out"},
  59     {"text", OPT_TEXT, '-', "Print the key in text"},
  60     {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
  61     {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
  62     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  63
  64     OPT_PROV_OPTIONS,
  65     {NULL}
  66 };
  67
  68 int dsa_main(int argc, char **argv)
  69 {
  70     BIO *out = NULL;
  71     DSA *dsa = NULL;
  72     ENGINE *e = NULL;
  73     EVP_PKEY *pkey = 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
  85     prog = opt_init(argc, argv, dsa_options);
  86     while ((o = opt_next()) != OPT_EOF) {
  87         switch (o) {
  88         case OPT_EOF:
  89         case OPT_ERR:
  90  opthelp:
  91             ret = 0;
  92             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  93             goto end;
  94         case OPT_HELP:
  95             opt_help(dsa_options);
  96             ret = 0;
  97             goto end;
  98         case OPT_INFORM:
  99             if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
 100                 goto opthelp;
 101             break;
 102         case OPT_IN:
 103             infile = opt_arg();
 104             break;
 105         case OPT_OUTFORM:
 106             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
 107                 goto opthelp;
 108             break;
 109         case OPT_OUT:
 110             outfile = opt_arg();
 111             break;
 112         case OPT_ENGINE:
 113             e = setup_engine(opt_arg(), 0);
 114             break;
 115         case OPT_PASSIN:
 116             passinarg = opt_arg();
 117             break;
 118         case OPT_PASSOUT:
 119             passoutarg = opt_arg();
 120             break;
 121         case OPT_PVK_STRONG:    /* pvk_encr:= 2 */
 122         case OPT_PVK_WEAK:      /* pvk_encr:= 1 */
 123         case OPT_PVK_NONE:      /* pvk_encr:= 0 */
 124 #ifndef OPENSSL_NO_RC4
 125             pvk_encr = (o - OPT_PVK_NONE);
 126 #endif
 127             break;
 128         case OPT_NOOUT:
 129             noout = 1;
 130             break;
 131         case OPT_TEXT:
 132             text = 1;
 133             break;
 134         case OPT_MODULUS:
 135             modulus = 1;
 136             break;
 137         case OPT_PUBIN:
 138             pubin = 1;
 139             break;
 140         case OPT_PUBOUT:
 141             pubout = 1;
 142             break;
 143         case OPT_CIPHER:
 144             if (!opt_cipher(opt_unknown(), &enc))
 145                 goto end;
 146             break;
 147         case OPT_PROV_CASES:
 148             if (!opt_provider(o))
 149                 goto end;
 150             break;
 151         }
 152     }
 153     argc = opt_num_rest();
 154     if (argc != 0)
 155         goto opthelp;
 156
 157     private = pubin || pubout ? 0 : 1;
 158     if (text && !pubin)
 159         private = 1;
 160
 161     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 162         BIO_printf(bio_err, "Error getting passwords\n");
 163         goto end;
 164     }
 165
 166     BIO_printf(bio_err, "read DSA key\n");
 167     if (pubin)
 168         pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");
 169     else
 170         pkey = load_key(infile, informat, 1, passin, e, "Private Key");
 171
 172     if (pkey != NULL)
 173         dsa = EVP_PKEY_get1_DSA(pkey);
 174
 175     if (dsa == NULL) {
 176         BIO_printf(bio_err, "unable to load Key\n");
 177         ERR_print_errors(bio_err);
 178         goto end;
 179     }
 180
 181     out = bio_open_owner(outfile, outformat, private);
 182     if (out == NULL)
 183         goto end;
 184
 185     if (text) {
 186         assert(pubin || private);
 187         if ((pubin && EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
 188             || (!pubin && EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)) {
 189             perror(outfile);
 190             ERR_print_errors(bio_err);
 191             goto end;
 192         }
 193     }
 194
 195     if (modulus) {
 196         const BIGNUM *pub_key = NULL;
 197         DSA_get0_key(dsa, &pub_key, NULL);
 198         BIO_printf(out, "Public Key=");
 199         BN_print(out, pub_key);
 200         BIO_printf(out, "\n");
 201     }
 202
 203     if (noout) {
 204         ret = 0;
 205         goto end;
 206     }
 207     BIO_printf(bio_err, "writing DSA key\n");
 208     if (outformat == FORMAT_ASN1) {
 209         if (pubin || pubout) {
 210             i = i2d_DSA_PUBKEY_bio(out, dsa);
 211         } else {
 212             assert(private);
 213             i = i2d_DSAPrivateKey_bio(out, dsa);
 214         }
 215     } else if (outformat == FORMAT_PEM) {
 216         if (pubin || pubout) {
 217             i = PEM_write_bio_DSA_PUBKEY(out, dsa);
 218         } else {
 219             assert(private);
 220             i = PEM_write_bio_DSAPrivateKey(out, dsa, enc,
 221                                             NULL, 0, NULL, passout);
 222         }
 223 #ifndef OPENSSL_NO_RSA
 224     } else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
 225         EVP_PKEY *pk;
 226         pk = EVP_PKEY_new();
 227         if (pk == NULL)
 228            goto end;
 229
 230         EVP_PKEY_set1_DSA(pk, dsa);
 231         if (outformat == FORMAT_PVK) {
 232             if (pubin) {
 233                 BIO_printf(bio_err, "PVK form impossible with public key input\n");
 234                 EVP_PKEY_free(pk);
 235                 goto end;
 236             }
 237             assert(private);
 238 # ifdef OPENSSL_NO_RC4
 239             BIO_printf(bio_err, "PVK format not supported\n");
 240             EVP_PKEY_free(pk);
 241             goto end;
 242 # else
 243             i = i2b_PVK_bio(out, pk, pvk_encr, 0, passout);
 244 # endif
 245         } else if (pubin || pubout) {
 246             i = i2b_PublicKey_bio(out, pk);
 247         } else {
 248             assert(private);
 249             i = i2b_PrivateKey_bio(out, pk);
 250         }
 251         EVP_PKEY_free(pk);
 252 #endif
 253     } else {
 254         BIO_printf(bio_err, "bad output format specified for outfile\n");
 255         goto end;
 256     }
 257     if (i <= 0) {
 258         BIO_printf(bio_err, "unable to write private key\n");
 259         ERR_print_errors(bio_err);
 260         goto end;
 261     }
 262     ret = 0;
 263  end:
 264     BIO_free_all(out);
 265     EVP_PKEY_free(pkey);
 266     DSA_free(dsa);
 267     release_engine(e);
 268     OPENSSL_free(passin);
 269     OPENSSL_free(passout);
 270     return ret;
 271 }