text: /*
   * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (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 "progs.h"
  #include "ec_common.h"
  #include <openssl/pem.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/core_names.h>
  
  typedef enum OPTION_choice {
      OPT_COMMON,
      OPT_INFORM, OPT_OUTFORM, OPT_PASSIN, OPT_PASSOUT, OPT_ENGINE,
      OPT_IN, OPT_OUT, OPT_PUBIN, OPT_PUBOUT, OPT_TEXT_PUB,
      OPT_TEXT, OPT_NOOUT, OPT_CIPHER, OPT_TRADITIONAL, OPT_CHECK, OPT_PUB_CHECK,
      OPT_EC_PARAM_ENC, OPT_EC_CONV_FORM,
      OPT_PROV_ENUM
  } OPTION_CHOICE;
  
  const OPTIONS pkey_options[] = {
      OPT_SECTION("General"),
      {"help", OPT_HELP, '-', "Display this summary"},
  #ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  #endif
      OPT_PROV_OPTIONS,
  
      {"check", OPT_CHECK, '-', "Check key consistency"},
      {"pubcheck", OPT_PUB_CHECK, '-', "Check public key consistency"},
  
      OPT_SECTION("Input"),
      {"in", OPT_IN, 's', "Input key"},
      {"inform", OPT_INFORM, 'f',
       "Key input format (ENGINE, other values ignored)"},
      {"passin", OPT_PASSIN, 's', "Key input pass phrase source"},
      {"pubin", OPT_PUBIN, '-',
       "Read only public components from key input"},
  
      OPT_SECTION("Output"),
      {"out", OPT_OUT, '>', "Output file for encoded and/or text output"},
      {"outform", OPT_OUTFORM, 'F', "Output encoding format (DER or PEM)"},
      {"", OPT_CIPHER, '-', "Any supported cipher to be used for encryption"},
      {"passout", OPT_PASSOUT, 's', "Output PEM file pass phrase source"},
      {"traditional", OPT_TRADITIONAL, '-',
       "Use traditional format for private key PEM output"},
      {"pubout", OPT_PUBOUT, '-', "Restrict encoded output to public components"},
      {"noout", OPT_NOOUT, '-', "Do not output the key in encoded form"},
      {"text", OPT_TEXT, '-', "Output key components in plaintext"},
      {"text_pub", OPT_TEXT_PUB, '-',
       "Output only public key components in text form"},
      {"ec_conv_form", OPT_EC_CONV_FORM, 's',
       "Specifies the EC point conversion form in the encoding"},
      {"ec_param_enc", OPT_EC_PARAM_ENC, 's',
       "Specifies the way the EC parameters are encoded"},
  
      {NULL}
  };
  
  int pkey_main(int argc, char **argv)
  {
      BIO *out = NULL;
      ENGINE *e = NULL;
      EVP_PKEY *pkey = NULL;
      EVP_PKEY_CTX *ctx = NULL;
      EVP_CIPHER *cipher = NULL;
      char *infile = NULL, *outfile = NULL, *passin = NULL, *passout = NULL;
      char *passinarg = NULL, *passoutarg = NULL, *ciphername = NULL, *prog;
      OPTION_CHOICE o;
      int informat = FORMAT_UNDEF, outformat = FORMAT_PEM;
      int pubin = 0, pubout = 0, text_pub = 0, text = 0, noout = 0, ret = 1;
      int private = 0, traditional = 0, check = 0, pub_check = 0;
  #ifndef OPENSSL_NO_EC
      char *asn1_encoding = NULL;
      char *point_format = NULL;
  #endif
  
      prog = opt_init(argc, argv, pkey_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(pkey_options);
              ret = 0;
              goto end;
          case OPT_INFORM:
              if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
                  goto opthelp;
              break;
          case OPT_OUTFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
                  goto opthelp;
              break;
          case OPT_PASSIN:
              passinarg = opt_arg();
              break;
          case OPT_PASSOUT:
              passoutarg = opt_arg();
              break;
          case OPT_ENGINE:
              e = setup_engine(opt_arg(), 0);
              break;
          case OPT_IN:
              infile = opt_arg();
              break;
          case OPT_OUT:
              outfile = opt_arg();
              break;
          case OPT_PUBIN:
              pubin = pubout = 1;
              break;
          case OPT_PUBOUT:
              pubout = 1;
              break;
          case OPT_TEXT_PUB:
              text_pub = 1;
              break;
          case OPT_TEXT:
              text = 1;
              break;
          case OPT_NOOUT:
              noout = 1;
              break;
          case OPT_TRADITIONAL:
              traditional = 1;
              break;
          case OPT_CHECK:
              check = 1;
              break;
          case OPT_PUB_CHECK:
              pub_check = 1;
              break;
          case OPT_CIPHER:
              ciphername = opt_unknown();
              break;
          case OPT_EC_CONV_FORM:
  #ifdef OPENSSL_NO_EC
              goto opthelp;
  #else
              point_format = opt_arg();
              if (!opt_string(point_format, point_format_options))
                  goto opthelp;
              break;
  #endif
          case OPT_EC_PARAM_ENC:
  #ifdef OPENSSL_NO_EC
              goto opthelp;
  #else
              asn1_encoding = opt_arg();
              if (!opt_string(asn1_encoding, asn1_encoding_options))
                  goto opthelp;
              break;
  #endif
          case OPT_PROV_CASES:
              if (!opt_provider(o))
                  goto end;
              break;
          }
      }
  
      /* No extra arguments. */
      argc = opt_num_rest();
      if (argc != 0)
          goto opthelp;
  
      if (noout && pubout)
          BIO_printf(bio_err,
                     "Warning: The -pubout option is ignored with -noout\n");
      if (text && text_pub)
          BIO_printf(bio_err,
                     "Warning: The -text option is ignored with -text_pub\n");
      if (traditional && (noout || outformat != FORMAT_PEM))
          BIO_printf(bio_err,
                     "Warning: The -traditional is ignored since there is no PEM output\n");
      private = (!noout && !pubout) || (text && !text_pub);
  
      if (ciphername != NULL) {
          if (!opt_cipher(ciphername, &cipher))
              goto opthelp;
      }
      if (cipher == NULL) {
          if (passoutarg != NULL)
              BIO_printf(bio_err,
                         "Warning: The -passout option is ignored without a cipher option\n");
      } else {
          if (noout || outformat != FORMAT_PEM) {
              BIO_printf(bio_err,
                         "Error: Cipher options are supported only for PEM output\n");
              goto end;
          }
      }
      if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
          BIO_printf(bio_err, "Error getting passwords\n");
          goto end;
      }
  
      out = bio_open_owner(outfile, outformat, private);
      if (out == NULL)
          goto end;
  
      if (pubin)
          pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");
      else
          pkey = load_key(infile, informat, 1, passin, e, "key");
      if (pkey == NULL)
          goto end;
  
  #ifndef OPENSSL_NO_EC
      if (asn1_encoding != NULL || point_format != NULL) {
          OSSL_PARAM params[3], *p = params;
  
          if (!EVP_PKEY_is_a(pkey, "EC"))
              goto end;
  
          if (asn1_encoding != NULL)
              *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING,
                                                      asn1_encoding, 0);
          if (point_format != NULL)
              *p++ = OSSL_PARAM_construct_utf8_string(
                         OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
                         point_format, 0);
          *p = OSSL_PARAM_construct_end();
          if (EVP_PKEY_set_params(pkey, params) <= 0)
              goto end;
      }
  #endif
  
      if (check || pub_check) {
          int r;
  
          ctx = EVP_PKEY_CTX_new(pkey, e);
          if (ctx == NULL) {
              ERR_print_errors(bio_err);
              goto end;
          }
  
          if (check)
              r = EVP_PKEY_check(ctx);
          else
              r = EVP_PKEY_public_check(ctx);
  
          if (r == 1) {
              BIO_printf(out, "Key is valid\n");
          } else {
              /*
               * Note: at least for RSA keys if this function returns
               * -1, there will be no error reasons.
               */
              BIO_printf(bio_err, "Key is invalid\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (!noout) {
          if (outformat == FORMAT_PEM) {
              if (pubout) {
                  if (!PEM_write_bio_PUBKEY(out, pkey))
                      goto end;
              } else {
                  assert(private);
                  if (traditional) {
                      if (!PEM_write_bio_PrivateKey_traditional(out, pkey, cipher,
                                                                NULL, 0, NULL,
                                                                passout))
                          goto end;
                  } else {
                      if (!PEM_write_bio_PrivateKey(out, pkey, cipher,
                                                    NULL, 0, NULL, passout))
                          goto end;
                  }
              }
          } else if (outformat == FORMAT_ASN1) {
              if (text || text_pub) {
                  BIO_printf(bio_err,
                             "Error: Text output cannot be combined with DER output\n");
                  goto end;
              }
              if (pubout) {
                  if (!i2d_PUBKEY_bio(out, pkey))
                      goto end;
              } else {
                  assert(private);
                  if (!i2d_PrivateKey_bio(out, pkey))
                      goto end;
              }
          } else {
              BIO_printf(bio_err, "Bad format specified for key\n");
              goto end;
          }
      }
  
      if (text_pub) {
          if (EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
              goto end;
      } else if (text) {
          assert(private);
          if (EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)
              goto end;
      }
  
      ret = 0;
  
   end:
      if (ret != 0)
          ERR_print_errors(bio_err);
      EVP_PKEY_CTX_free(ctx);
      EVP_PKEY_free(pkey);
      EVP_CIPHER_free(cipher);
      release_engine(e);
      BIO_free_all(out);
      OPENSSL_free(passin);
      OPENSSL_free(passout);
  
      return ret;
  }
  