text: /*
   * Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include <string.h>
  #include "apps.h"
  #include <openssl/pem.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_IN, OPT_OUT, OPT_TEXT, OPT_NOOUT,
      OPT_ENGINE, OPT_CHECK
  } OPTION_CHOICE;
  
  const OPTIONS pkeyparam_options[] = {
      {"help", OPT_HELP, '-', "Display this summary"},
      {"in", OPT_IN, '<', "Input file"},
      {"out", OPT_OUT, '>', "Output file"},
      {"text", OPT_TEXT, '-', "Print parameters as text"},
      {"noout", OPT_NOOUT, '-', "Don't output encoded parameters"},
  #ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  #endif
      {"check", OPT_CHECK, '-', "Check key param consistency"},
      {NULL}
  };
  
  int pkeyparam_main(int argc, char **argv)
  {
      ENGINE *e = NULL;
      BIO *in = NULL, *out = NULL;
      EVP_PKEY *pkey = NULL;
      int text = 0, noout = 0, ret = 1, check = 0;
      OPTION_CHOICE o;
      char *infile = NULL, *outfile = NULL, *prog;
  
      prog = opt_init(argc, argv, pkeyparam_options);
      while ((o = opt_next()) != OPT_EOF) {
          switch (o) {
          case OPT_EOF:
          case OPT_ERR:
   opthelp:
              BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
              goto end;
          case OPT_HELP:
              opt_help(pkeyparam_options);
              ret = 0;
              goto end;
          case OPT_IN:
              infile = opt_arg();
              break;
          case OPT_OUT:
              outfile = opt_arg();
              break;
          case OPT_ENGINE:
              e = setup_engine(opt_arg(), 0);
              break;
          case OPT_TEXT:
              text = 1;
              break;
          case OPT_NOOUT:
              noout = 1;
              break;
          case OPT_CHECK:
              check = 1;
              break;
          }
      }
      argc = opt_num_rest();
      if (argc != 0)
          goto opthelp;
  
      in = bio_open_default(infile, 'r', FORMAT_PEM);
      if (in == NULL)
          goto end;
      out = bio_open_default(outfile, 'w', FORMAT_PEM);
      if (out == NULL)
          goto end;
      pkey = PEM_read_bio_Parameters(in, NULL);
      if (pkey == NULL) {
          BIO_printf(bio_err, "Error reading parameters\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (check) {
          int r;
          EVP_PKEY_CTX *ctx;
  
          ctx = EVP_PKEY_CTX_new(pkey, e);
          if (ctx == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
  
          r = EVP_PKEY_param_check(ctx);
  
          if (r == 1) {
              BIO_printf(out, "Parameters are valid\n");
          } else {
              /*
               * Note: at least for RSA keys if this function returns
               * -1, there will be no error reasons.
               */
              unsigned long err;
  
              BIO_printf(out, "Parameters are invalid\n");
  
              while ((err = ERR_peek_error()) != 0) {
                  BIO_printf(out, "Detailed error: %s\n",
                             ERR_reason_error_string(err));
                  ERR_get_error(); /* remove err from error stack */
              }
          }
          EVP_PKEY_CTX_free(ctx);
      }
  
      if (!noout)
          PEM_write_bio_Parameters(out, pkey);
  
      if (text)
          EVP_PKEY_print_params(out, pkey, 0, NULL);
  
      ret = 0;
  
   end:
      EVP_PKEY_free(pkey);
      release_engine(e);
      BIO_free_all(out);
      BIO_free(in);
  
      return ret;
  }
  