apps/dsa.c

   1 /*
   2  * Copyright 1995-2021 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 #include <openssl/encoder.h>
  26 #include <openssl/core_names.h>
  27 #include <openssl/core_dispatch.h>
  28
  29 #ifndef OPENSSL_NO_RC4
  30 # define DEFAULT_PVK_ENCR_STRENGTH      2
  31 #else
  32 # define DEFAULT_PVK_ENCR_STRENGTH      0
  33 #endif
  34
  35 typedef enum OPTION_choice {
  36     OPT_COMMON,
  37     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_ENGINE,
  38     /* Do not change the order here; see case statements below */
  39     OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
  40     OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
  41     OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT,
  42     OPT_PROV_ENUM
  43 } OPTION_CHOICE;
  44
  45 const OPTIONS dsa_options[] = {
  46     OPT_SECTION("General"),
  47     {"help", OPT_HELP, '-', "Display this summary"},
  48     {"", OPT_CIPHER, '-', "Any supported cipher"},
  49 #ifndef OPENSSL_NO_RC4
  50     {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
  51     {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
  52     {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
  53 #endif
  54 #ifndef OPENSSL_NO_ENGINE
  55     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
  56 #endif
  57
  58     OPT_SECTION("Input"),
  59     {"in", OPT_IN, 's', "Input key"},
  60     {"inform", OPT_INFORM, 'f', "Input format (DER/PEM/PVK); has no effect"},
  61     {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
  62     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  63
  64     OPT_SECTION("Output"),
  65     {"out", OPT_OUT, '>', "Output file"},
  66     {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
  67     {"noout", OPT_NOOUT, '-', "Don't print key out"},
  68     {"text", OPT_TEXT, '-', "Print the key in text"},
  69     {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
  70     {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
  71     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  72
  73     OPT_PROV_OPTIONS,
  74     {NULL}
  75 };
  76
  77 int dsa_main(int argc, char **argv)
  78 {
  79     BIO *out = NULL;
  80     ENGINE *e = NULL;
  81     EVP_PKEY *pkey = NULL;
  82     EVP_CIPHER *enc = NULL;
  83     char *infile = NULL, *outfile = NULL, *prog;
  84     char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
  85     OPTION_CHOICE o;
  86     int informat = FORMAT_UNDEF, outformat = FORMAT_PEM, text = 0, noout = 0;
  87     int modulus = 0, pubin = 0, pubout = 0, ret = 1;
  88     int pvk_encr = DEFAULT_PVK_ENCR_STRENGTH;
  89     int private = 0;
  90     const char *output_type = NULL, *ciphername = NULL;
  91     const char *output_structure = NULL;
  92     int selection = 0;
  93     OSSL_ENCODER_CTX *ectx = NULL;
  94
  95     opt_set_unknown_name("cipher");
  96     prog = opt_init(argc, argv, dsa_options);
  97     while ((o = opt_next()) != OPT_EOF) {
  98         switch (o) {
  99         case OPT_EOF:
 100         case OPT_ERR:
 101  opthelp:
 102             ret = 0;
 103             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 104             goto end;
 105         case OPT_HELP:
 106             opt_help(dsa_options);
 107             ret = 0;
 108             goto end;
 109         case OPT_INFORM:
 110             if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
 111                 goto opthelp;
 112             break;
 113         case OPT_IN:
 114             infile = opt_arg();
 115             break;
 116         case OPT_OUTFORM:
 117             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
 118                 goto opthelp;
 119             break;
 120         case OPT_OUT:
 121             outfile = opt_arg();
 122             break;
 123         case OPT_ENGINE:
 124             e = setup_engine(opt_arg(), 0);
 125             break;
 126         case OPT_PASSIN:
 127             passinarg = opt_arg();
 128             break;
 129         case OPT_PASSOUT:
 130             passoutarg = opt_arg();
 131             break;
 132         case OPT_PVK_STRONG:    /* pvk_encr:= 2 */
 133         case OPT_PVK_WEAK:      /* pvk_encr:= 1 */
 134         case OPT_PVK_NONE:      /* pvk_encr:= 0 */
 135 #ifndef OPENSSL_NO_RC4
 136             pvk_encr = (o - OPT_PVK_NONE);
 137 #endif
 138             break;
 139         case OPT_NOOUT:
 140             noout = 1;
 141             break;
 142         case OPT_TEXT:
 143             text = 1;
 144             break;
 145         case OPT_MODULUS:
 146             modulus = 1;
 147             break;
 148         case OPT_PUBIN:
 149             pubin = 1;
 150             break;
 151         case OPT_PUBOUT:
 152             pubout = 1;
 153             break;
 154         case OPT_CIPHER:
 155             ciphername = opt_unknown();
 156             break;
 157         case OPT_PROV_CASES:
 158             if (!opt_provider(o))
 159                 goto end;
 160             break;
 161         }
 162     }
 163
 164     /* No extra args. */
 165     if (!opt_check_rest_arg(NULL))
 166         goto opthelp;
 167
 168     if (!opt_cipher(ciphername, &enc))
 169         goto end;
 170     private = pubin || pubout ? 0 : 1;
 171     if (text && !pubin)
 172         private = 1;
 173
 174     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 175         BIO_printf(bio_err, "Error getting passwords\n");
 176         goto end;
 177     }
 178
 179     BIO_printf(bio_err, "read DSA key\n");
 180     if (pubin)
 181         pkey = load_pubkey(infile, informat, 1, passin, e, "public key");
 182     else
 183         pkey = load_key(infile, informat, 1, passin, e, "private key");
 184
 185     if (pkey == NULL) {
 186         BIO_printf(bio_err, "unable to load Key\n");
 187         ERR_print_errors(bio_err);
 188         goto end;
 189     }
 190     if (!EVP_PKEY_is_a(pkey, "DSA")) {
 191         BIO_printf(bio_err, "Not a DSA key\n");
 192         goto end;
 193     }
 194
 195     out = bio_open_owner(outfile, outformat, private);
 196     if (out == NULL)
 197         goto end;
 198
 199     if (text) {
 200         assert(pubin || private);
 201         if ((pubin && EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
 202             || (!pubin && EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)) {
 203             perror(outfile);
 204             ERR_print_errors(bio_err);
 205             goto end;
 206         }
 207     }
 208
 209     if (modulus) {
 210         BIGNUM *pub_key = NULL;
 211
 212         if (!EVP_PKEY_get_bn_param(pkey, "pub", &pub_key)) {
 213             ERR_print_errors(bio_err);
 214             goto end;
 215         }
 216         BIO_printf(out, "Public Key=");
 217         BN_print(out, pub_key);
 218         BIO_printf(out, "\n");
 219         BN_free(pub_key);
 220     }
 221
 222     if (noout) {
 223         ret = 0;
 224         goto end;
 225     }
 226     BIO_printf(bio_err, "writing DSA key\n");
 227     if (outformat == FORMAT_ASN1) {
 228         output_type = "DER";
 229     } else if (outformat == FORMAT_PEM) {
 230         output_type = "PEM";
 231     } else if (outformat == FORMAT_MSBLOB) {
 232         output_type = "MSBLOB";
 233     } else if (outformat == FORMAT_PVK) {
 234         if (pubin) {
 235             BIO_printf(bio_err, "PVK form impossible with public key input\n");
 236             goto end;
 237         }
 238         output_type = "PVK";
 239     } else {
 240         BIO_printf(bio_err, "bad output format specified for outfile\n");
 241         goto end;
 242     }
 243
 244     if (outformat == FORMAT_ASN1 || outformat == FORMAT_PEM) {
 245         if (pubout || pubin)
 246             output_structure = "SubjectPublicKeyInfo";
 247         else
 248             output_structure = "type-specific";
 249     }
 250
 251     /* Select what you want in the output */
 252     if (pubout || pubin) {
 253         selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
 254     } else {
 255         assert(private);
 256         selection = (OSSL_KEYMGMT_SELECT_KEYPAIR
 257                      | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
 258     }
 259
 260     /* Perform the encoding */
 261     ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, output_type,
 262                                          output_structure, NULL);
 263     if (OSSL_ENCODER_CTX_get_num_encoders(ectx) == 0) {
 264         BIO_printf(bio_err, "%s format not supported\n", output_type);
 265         goto end;
 266     }
 267
 268     /* Passphrase setup */
 269     if (enc != NULL)
 270         OSSL_ENCODER_CTX_set_cipher(ectx, EVP_CIPHER_get0_name(enc), NULL);
 271
 272     /* Default passphrase prompter */
 273     if (enc != NULL || outformat == FORMAT_PVK) {
 274         OSSL_ENCODER_CTX_set_passphrase_ui(ectx, get_ui_method(), NULL);
 275         if (passout != NULL)
 276             /* When passout given, override the passphrase prompter */
 277             OSSL_ENCODER_CTX_set_passphrase(ectx,
 278                                             (const unsigned char *)passout,
 279                                             strlen(passout));
 280     }
 281
 282     /* PVK requires a bit more */
 283     if (outformat == FORMAT_PVK) {
 284         OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 285
 286         params[0] = OSSL_PARAM_construct_int("encrypt-level", &pvk_encr);
 287         if (!OSSL_ENCODER_CTX_set_params(ectx, params)) {
 288             BIO_printf(bio_err, "invalid PVK encryption level\n");
 289             goto end;
 290         }
 291     }
 292
 293     if (!OSSL_ENCODER_to_bio(ectx, out)) {
 294         BIO_printf(bio_err, "unable to write key\n");
 295         goto end;
 296     }
 297     ret = 0;
 298  end:
 299     if (ret != 0)
 300         ERR_print_errors(bio_err);
 301     OSSL_ENCODER_CTX_free(ectx);
 302     BIO_free_all(out);
 303     EVP_PKEY_free(pkey);
 304     EVP_CIPHER_free(enc);
 305     release_engine(e);
 306     OPENSSL_free(passin);
 307     OPENSSL_free(passout);
 308     return ret;
 309 }