text: /*
   * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
   * 2002.
   */
  /* ====================================================================
   * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #include <openssl/opensslconf.h>
  #ifdef OPENSSL_NO_TS
  NON_EMPTY_TRANSLATION_UNIT
  #else
  # include <stdio.h>
  # include <stdlib.h>
  # include <string.h>
  # include "apps.h"
  # include <openssl/bio.h>
  # include <openssl/err.h>
  # include <openssl/pem.h>
  # include <openssl/rand.h>
  # include <openssl/ts.h>
  # include <openssl/bn.h>
  
  /* Request nonce length, in bits (must be a multiple of 8). */
  # define NONCE_LENGTH            64
  
  /* Name of config entry that defines the OID file. */
  # define ENV_OID_FILE            "oid_file"
  
  /* Is |EXACTLY_ONE| of three pointers set? */
  # define EXACTLY_ONE(a, b, c) \
          (( a && !b && !c) || \
           ( b && !a && !c) || \
           ( c && !a && !b))
  
  static ASN1_OBJECT *txt2obj(const char *oid);
  static CONF *load_config_file(const char *configfile);
  
  /* Query related functions. */
  static int query_command(const char *data, char *digest,
                           const EVP_MD *md, const char *policy, int no_nonce,
                           int cert, const char *in, const char *out, int text);
  static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
                              const char *policy, int no_nonce, int cert);
  static int create_digest(BIO *input, char *digest,
                           const EVP_MD *md, unsigned char **md_value);
  static ASN1_INTEGER *create_nonce(int bits);
  
  /* Reply related functions. */
  static int reply_command(CONF *conf, char *section, char *engine,
                           char *queryfile, char *passin, char *inkey,
                           const EVP_MD *md, char *signer, char *chain,
                           const char *policy, char *in, int token_in,
                           char *out, int token_out, int text);
  static TS_RESP *read_PKCS7(BIO *in_bio);
  static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
                                  char *queryfile, char *passin,
                                  char *inkey, const EVP_MD *md, char *signer,
                                  char *chain, const char *policy);
  static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data);
  static ASN1_INTEGER *next_serial(const char *serialfile);
  static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial);
  
  /* Verify related functions. */
  static int verify_command(char *data, char *digest, char *queryfile,
                            char *in, int token_in,
                            char *CApath, char *CAfile, char *untrusted,
                            X509_VERIFY_PARAM *vpm);
  static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
                                          char *queryfile,
                                          char *CApath, char *CAfile,
                                          char *untrusted,
                                          X509_VERIFY_PARAM *vpm);
  static X509_STORE *create_cert_store(char *CApath, char *CAfile,
                                       X509_VERIFY_PARAM *vpm);
  static int verify_cb(int ok, X509_STORE_CTX *ctx);
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_ENGINE, OPT_CONFIG, OPT_SECTION, OPT_QUERY, OPT_DATA,
      OPT_DIGEST, OPT_RAND, OPT_TSPOLICY, OPT_NO_NONCE, OPT_CERT,
      OPT_IN, OPT_TOKEN_IN, OPT_OUT, OPT_TOKEN_OUT, OPT_TEXT,
      OPT_REPLY, OPT_QUERYFILE, OPT_PASSIN, OPT_INKEY, OPT_SIGNER,
      OPT_CHAIN, OPT_VERIFY, OPT_CAPATH, OPT_CAFILE, OPT_UNTRUSTED,
      OPT_MD, OPT_V_ENUM
  } OPTION_CHOICE;
  
  OPTIONS ts_options[] = {
      {"help", OPT_HELP, '-', "Display this summary"},
      {"config", OPT_CONFIG, '<', "Configuration file"},
      {"section", OPT_SECTION, 's', "Section to use within config file"},
      {"query", OPT_QUERY, '-', "Generate a TS query"},
      {"data", OPT_DATA, '<', "File to hash"},
      {"digest", OPT_DIGEST, 's', "Digest (as a hex string)"},
      {"rand", OPT_RAND, 's',
       "Load the file(s) into the random number generator"},
      {"tspolicy", OPT_TSPOLICY, 's', "Policy OID to use"},
      {"no_nonce", OPT_NO_NONCE, '-', "Do not include a nonce"},
      {"cert", OPT_CERT, '-', "Put cert request into query"},
      {"in", OPT_IN, '<', "Input file"},
      {"token_in", OPT_TOKEN_IN, '-', "Input is a PKCS#7 file"},
      {"out", OPT_OUT, '>', "Output file"},
      {"token_out", OPT_TOKEN_OUT, '-', "Output is a PKCS#7 file"},
      {"text", OPT_TEXT, '-', "Output text (not DER)"},
      {"reply", OPT_REPLY, '-', "Generate a TS reply"},
      {"queryfile", OPT_QUERYFILE, '<', "File containing a TS query"},
      {"passin", OPT_PASSIN, 's'},
      {"inkey", OPT_INKEY, '<', "File with private key for reply"},
      {"signer", OPT_SIGNER, 's'},
      {"chain", OPT_CHAIN, '<', "File with signer CA chain"},
      {"verify", OPT_VERIFY, '-', "Verify a TS response"},
      {"CApath", OPT_CAPATH, '/', "Path to trusted CA files"},
      {"CAfile", OPT_CAFILE, '<', "File with trusted CA certs"},
      {"untrusted", OPT_UNTRUSTED, '<', "File with untrusted certs"},
      {"", OPT_MD, '-', "Any supported digest"},
  # ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  # endif
      {OPT_HELP_STR, 1, '-', "\nOptions specific to 'ts -verify': \n"},
      OPT_V_OPTIONS,
      {OPT_HELP_STR, 1, '-', "\n"},
      {NULL}
  };
  
  /*
   * This comand is so complex, special help is needed.
   */
  static char* opt_helplist[] = {
      "Typical uses:",
      "ts -query [-rand file...] [-config file] [-data file]",
      "          [-digest hexstring] [-tspolicy oid] [-no_nonce] [-cert]",
      "          [-in file] [-out file] [-text]",
      "  or",
      "ts -reply [-config file] [-section tsa_section]",
      "          [-queryfile file] [-passin password]",
      "          [-signer tsa_cert.pem] [-inkey private_key.pem]",
      "          [-chain certs_file.pem] [-tspolicy oid]",
      "          [-in file] [-token_in] [-out file] [-token_out]",
  # ifndef OPENSSL_NO_ENGINE
      "          [-text]",
  # else
      "          [-text] [-engine id]",
  # endif
      "  or",
      "ts -verify -CApath dir -CAfile file.pem -untrusted file.pem",
      "           [-data file] [-digest hexstring]",
      "           [-queryfile file] -in file [-token_in]",
      "           [[options specific to 'ts -verify']]",
      NULL,
  };
  
  int ts_main(int argc, char **argv)
  {
      CONF *conf = NULL;
      char *CAfile = NULL, *untrusted = NULL, *engine = NULL, *prog, **helpp;
      char *configfile = default_config_file;
      char *section = NULL, *password = NULL;
      char *data = NULL, *digest = NULL, *rnd = NULL, *policy = NULL;
      char *in = NULL, *out = NULL, *queryfile = NULL, *passin = NULL;
      char *inkey = NULL, *signer = NULL, *chain = NULL, *CApath = NULL;
      const EVP_MD *md = NULL;
      OPTION_CHOICE o, mode = OPT_ERR;
      int ret = 1, no_nonce = 0, cert = 0, text = 0;
      int vpmtouched = 0;
      X509_VERIFY_PARAM *vpm = NULL;
      /* Input is ContentInfo instead of TimeStampResp. */
      int token_in = 0;
      /* Output is ContentInfo instead of TimeStampResp. */
      int token_out = 0;
  
      if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
          goto end;
  
      prog = opt_init(argc, argv, ts_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(ts_options);
              for (helpp = opt_helplist; *helpp; ++helpp)
                  BIO_printf(bio_err, "%s\n", *helpp);
              ret = 0;
              goto end;
          case OPT_CONFIG:
              configfile = opt_arg();
              break;
          case OPT_SECTION:
              section = opt_arg();
              break;
          case OPT_QUERY:
          case OPT_REPLY:
          case OPT_VERIFY:
              if (mode != OPT_ERR)
                  goto opthelp;
              mode = o;
              break;
          case OPT_DATA:
              data = opt_arg();
              break;
          case OPT_DIGEST:
              digest = opt_arg();
              break;
          case OPT_RAND:
              rnd = opt_arg();
              break;
          case OPT_TSPOLICY:
              policy = opt_arg();
              break;
          case OPT_NO_NONCE:
              no_nonce = 1;
              break;
          case OPT_CERT:
              cert = 1;
              break;
          case OPT_IN:
              in = opt_arg();
              break;
          case OPT_TOKEN_IN:
              token_in = 1;
              break;
          case OPT_OUT:
              out = opt_arg();
              break;
          case OPT_TOKEN_OUT:
              token_out = 1;
              break;
          case OPT_TEXT:
              text = 1;
              break;
          case OPT_QUERYFILE:
              queryfile = opt_arg();
              break;
          case OPT_PASSIN:
              passin = opt_arg();
              break;
          case OPT_INKEY:
              inkey = opt_arg();
              break;
          case OPT_SIGNER:
              signer = opt_arg();
              break;
          case OPT_CHAIN:
              chain = opt_arg();
              break;
          case OPT_CAPATH:
              CApath = opt_arg();
              break;
          case OPT_CAFILE:
              CAfile = opt_arg();
              break;
          case OPT_UNTRUSTED:
              untrusted = opt_arg();
              break;
          case OPT_ENGINE:
              engine = opt_arg();
              break;
          case OPT_MD:
              if (!opt_md(opt_unknown(), &md))
                  goto opthelp;
              break;
          case OPT_V_CASES:
              if (!opt_verify(o, vpm))
                  goto end;
              vpmtouched++;
              break;
          }
      }
      argc = opt_num_rest();
      argv = opt_rest();
      if (mode == OPT_ERR || argc != 0)
          goto opthelp;
  
      /* Seed the random number generator if it is going to be used. */
      if (mode == OPT_QUERY && !no_nonce) {
          if (!app_RAND_load_file(NULL, 1) && rnd == NULL)
              BIO_printf(bio_err, "warning, not much extra random "
                         "data, consider using the -rand option\n");
          if (rnd != NULL)
              BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
                         app_RAND_load_files(rnd));
      }
  
      if (mode == OPT_REPLY && passin &&
          !app_passwd(passin, NULL, &password, NULL)) {
          BIO_printf(bio_err, "Error getting password.\n");
          goto end;
      }
  
      conf = load_config_file(configfile);
      if (!app_load_modules(conf))
          goto end;
  
      /* Check parameter consistency and execute the appropriate function. */
      switch (mode) {
      default:
      case OPT_ERR:
          goto opthelp;
      case OPT_QUERY:
          if (vpmtouched)
              goto opthelp;
          if ((data != NULL) && (digest != NULL))
              goto opthelp;
          ret = !query_command(data, digest, md, policy, no_nonce, cert,
                               in, out, text);
          break;
      case OPT_REPLY:
          if (vpmtouched)
              goto opthelp;
          if ((in != NULL) && (queryfile != NULL))
              goto opthelp;
          if (in == NULL) {
              if ((conf == NULL) || (token_in != 0))
                  goto opthelp;
          }
          ret = !reply_command(conf, section, engine, queryfile,
                               password, inkey, md, signer, chain, policy,
                               in, token_in, out, token_out, text);
          break;
      case OPT_VERIFY:
          if ((in == NULL) || !EXACTLY_ONE(queryfile, data, digest))
              goto opthelp;
          ret = !verify_command(data, digest, queryfile, in, token_in,
                                CApath, CAfile, untrusted, 
                                vpmtouched ? vpm : NULL);
      }
  
   end:
      X509_VERIFY_PARAM_free(vpm);
      app_RAND_write_file(NULL);
      NCONF_free(conf);
      OPENSSL_free(password);
      OBJ_cleanup();
      return (ret);
  }
  
  /*
   * Configuration file-related function definitions.
   */
  
  static ASN1_OBJECT *txt2obj(const char *oid)
  {
      ASN1_OBJECT *oid_obj = NULL;
  
      if ((oid_obj = OBJ_txt2obj(oid, 0)) == NULL)
          BIO_printf(bio_err, "cannot convert %s to OID\n", oid);
  
      return oid_obj;
  }
  
  static CONF *load_config_file(const char *configfile)
  {
      CONF *conf = app_load_config(configfile);
  
      if (conf != NULL) {
          const char *p;
  
          BIO_printf(bio_err, "Using configuration from %s\n", configfile);
          p = NCONF_get_string(conf, NULL, ENV_OID_FILE);
          if (p != NULL) {
              BIO *oid_bio = BIO_new_file(p, "r");
              if (!oid_bio)
                  ERR_print_errors(bio_err);
              else {
                  OBJ_create_objects(oid_bio);
                  BIO_free_all(oid_bio);
              }
          } else
              ERR_clear_error();
          if (!add_oid_section(conf))
              ERR_print_errors(bio_err);
      }
      return conf;
  }
  
  /*
   * Query-related method definitions.
   */
  static int query_command(const char *data, char *digest, const EVP_MD *md,
                           const char *policy, int no_nonce,
                           int cert, const char *in, const char *out, int text)
  {
      int ret = 0;
      TS_REQ *query = NULL;
      BIO *in_bio = NULL;
      BIO *data_bio = NULL;
      BIO *out_bio = NULL;
  
      /* Build query object. */
      if (in != NULL) {
          if ((in_bio = bio_open_default(in, 'r', FORMAT_ASN1)) == NULL)
              goto end;
          query = d2i_TS_REQ_bio(in_bio, NULL);
      } else {
          if (digest == NULL
              && (data_bio = bio_open_default(data, 'r', FORMAT_ASN1)) == NULL)
              goto end;
          query = create_query(data_bio, digest, md, policy, no_nonce, cert);
      }
      if (query == NULL)
          goto end;
  
      if (text) {
          if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)
              goto end;
          if (!TS_REQ_print_bio(out_bio, query))
              goto end;
      } else {
          if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)
              goto end;
          if (!i2d_TS_REQ_bio(out_bio, query))
              goto end;
      }
  
      ret = 1;
  
   end:
      ERR_print_errors(bio_err);
      BIO_free_all(in_bio);
      BIO_free_all(data_bio);
      BIO_free_all(out_bio);
      TS_REQ_free(query);
      return ret;
  }
  
  static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
                              const char *policy, int no_nonce, int cert)
  {
      int ret = 0;
      TS_REQ *ts_req = NULL;
      int len;
      TS_MSG_IMPRINT *msg_imprint = NULL;
      X509_ALGOR *algo = NULL;
      unsigned char *data = NULL;
      ASN1_OBJECT *policy_obj = NULL;
      ASN1_INTEGER *nonce_asn1 = NULL;
  
      if (md == NULL && (md = EVP_get_digestbyname("sha1")) == NULL)
          goto err;
      if ((ts_req = TS_REQ_new()) == NULL)
          goto err;
      if (!TS_REQ_set_version(ts_req, 1))
          goto err;
      if ((msg_imprint = TS_MSG_IMPRINT_new()) == NULL)
          goto err;
      if ((algo = X509_ALGOR_new()) == NULL)
          goto err;
      if ((algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))) == NULL)
          goto err;
      if ((algo->parameter = ASN1_TYPE_new()) == NULL)
          goto err;
      algo->parameter->type = V_ASN1_NULL;
      if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo))
          goto err;
      if ((len = create_digest(data_bio, digest, md, &data)) == 0)
          goto err;
      if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len))
          goto err;
      if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint))
          goto err;
      if (policy && (policy_obj = txt2obj(policy)) == NULL)
          goto err;
      if (policy_obj && !TS_REQ_set_policy_id(ts_req, policy_obj))
          goto err;
  
      /* Setting nonce if requested. */
      if (!no_nonce && (nonce_asn1 = create_nonce(NONCE_LENGTH)) == NULL)
          goto err;
      if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1))
          goto err;
      if (!TS_REQ_set_cert_req(ts_req, cert))
          goto err;
  
      ret = 1;
   err:
      if (!ret) {
          TS_REQ_free(ts_req);
          ts_req = NULL;
          BIO_printf(bio_err, "could not create query\n");
          ERR_print_errors(bio_err);
      }
      TS_MSG_IMPRINT_free(msg_imprint);
      X509_ALGOR_free(algo);
      OPENSSL_free(data);
      ASN1_OBJECT_free(policy_obj);
      ASN1_INTEGER_free(nonce_asn1);
      return ts_req;
  }
  
  static int create_digest(BIO *input, char *digest, const EVP_MD *md,
                           unsigned char **md_value)
  {
      int md_value_len;
  
      md_value_len = EVP_MD_size(md);
      if (md_value_len < 0)
          return 0;
  
      if (input) {
          EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
          unsigned char buffer[4096];
          int length;
  
          if (md_ctx == NULL)
              return 0;
          *md_value = app_malloc(md_value_len, "digest buffer");
          EVP_DigestInit(md_ctx, md);
          while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {
              EVP_DigestUpdate(md_ctx, buffer, length);
          }
          if (!EVP_DigestFinal(md_ctx, *md_value, NULL)) {
              EVP_MD_CTX_free(md_ctx);
              return 0;
          }
          EVP_MD_CTX_free(md_ctx);
      } else {
          long digest_len;
          *md_value = string_to_hex(digest, &digest_len);
          if (!*md_value || md_value_len != digest_len) {
              OPENSSL_free(*md_value);
              *md_value = NULL;
              BIO_printf(bio_err, "bad digest, %d bytes "
                         "must be specified\n", md_value_len);
              return 0;
          }
      }
      return md_value_len;
  }
  
  static ASN1_INTEGER *create_nonce(int bits)
  {
      unsigned char buf[20];
      ASN1_INTEGER *nonce = NULL;
      int len = (bits - 1) / 8 + 1;
      int i;
  
      if (len > (int)sizeof(buf))
          goto err;
      if (RAND_bytes(buf, len) <= 0)
          goto err;
  
      /* Find the first non-zero byte and creating ASN1_INTEGER object. */
      for (i = 0; i < len && !buf[i]; ++i)
          continue;
      if ((nonce = ASN1_INTEGER_new()) == NULL)
          goto err;
      OPENSSL_free(nonce->data);
      nonce->length = len - i;
      nonce->data = app_malloc(nonce->length + 1, "nonce buffer");
      memcpy(nonce->data, buf + i, nonce->length);
      return nonce;
  
   err:
      BIO_printf(bio_err, "could not create nonce\n");
      ASN1_INTEGER_free(nonce);
      return NULL;
  }
  
  /*
   * Reply-related method definitions.
   */
  
  static int reply_command(CONF *conf, char *section, char *engine,
                           char *queryfile, char *passin, char *inkey,
                           const EVP_MD *md, char *signer, char *chain,
                           const char *policy, char *in, int token_in,
                           char *out, int token_out, int text)
  {
      int ret = 0;
      TS_RESP *response = NULL;
      BIO *in_bio = NULL;
      BIO *query_bio = NULL;
      BIO *inkey_bio = NULL;
      BIO *signer_bio = NULL;
      BIO *out_bio = NULL;
  
      if (in != NULL) {
          if ((in_bio = BIO_new_file(in, "rb")) == NULL)
              goto end;
          if (token_in) {
              response = read_PKCS7(in_bio);
          } else {
              response = d2i_TS_RESP_bio(in_bio, NULL);
          }
      } else {
          response = create_response(conf, section, engine, queryfile,
                                     passin, inkey, md, signer, chain, policy);
          if (response)
              BIO_printf(bio_err, "Response has been generated.\n");
          else
              BIO_printf(bio_err, "Response is not generated.\n");
      }
      if (response == NULL)
          goto end;
  
      /* Write response. */
      if (text) {
          if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)
          goto end;
          if (token_out) {
              TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
              if (!TS_TST_INFO_print_bio(out_bio, tst_info))
                  goto end;
          } else {
              if (!TS_RESP_print_bio(out_bio, response))
                  goto end;
          }
      } else {
          if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)
              goto end;
          if (token_out) {
              PKCS7 *token = TS_RESP_get_token(response);
              if (!i2d_PKCS7_bio(out_bio, token))
                  goto end;
          } else {
              if (!i2d_TS_RESP_bio(out_bio, response))
                  goto end;
          }
      }
  
      ret = 1;
  
   end:
      ERR_print_errors(bio_err);
      BIO_free_all(in_bio);
      BIO_free_all(query_bio);
      BIO_free_all(inkey_bio);
      BIO_free_all(signer_bio);
      BIO_free_all(out_bio);
      TS_RESP_free(response);
      return ret;
  }
  
  /* Reads a PKCS7 token and adds default 'granted' status info to it. */
  static TS_RESP *read_PKCS7(BIO *in_bio)
  {
      int ret = 0;
      PKCS7 *token = NULL;
      TS_TST_INFO *tst_info = NULL;
      TS_RESP *resp = NULL;
      TS_STATUS_INFO *si = NULL;
  
      if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
          goto end;
      if ((tst_info = PKCS7_to_TS_TST_INFO(token)) == NULL)
          goto end;
      if ((resp = TS_RESP_new()) == NULL)
          goto end;
      if ((si = TS_STATUS_INFO_new()) == NULL)
          goto end;
      if (!TS_STATUS_INFO_set_status(si, TS_STATUS_GRANTED))
          goto end;
      if (!TS_RESP_set_status_info(resp, si))
          goto end;
      TS_RESP_set_tst_info(resp, token, tst_info);
      token = NULL;               /* Ownership is lost. */
      tst_info = NULL;            /* Ownership is lost. */
      ret = 1;
  
   end:
      PKCS7_free(token);
      TS_TST_INFO_free(tst_info);
      if (!ret) {
          TS_RESP_free(resp);
          resp = NULL;
      }
      TS_STATUS_INFO_free(si);
      return resp;
  }
  
  static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
                                  char *queryfile, char *passin,
                                  char *inkey, const EVP_MD *md, char *signer,
                                  char *chain, const char *policy)
  {
      int ret = 0;
      TS_RESP *response = NULL;
      BIO *query_bio = NULL;
      TS_RESP_CTX *resp_ctx = NULL;
  
      if ((query_bio = BIO_new_file(queryfile, "rb")) == NULL)
          goto end;
      if ((section = TS_CONF_get_tsa_section(conf, section)) == NULL)
          goto end;
      if ((resp_ctx = TS_RESP_CTX_new()) == NULL)
          goto end;
      if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx))
          goto end;
  # ifndef OPENSSL_NO_ENGINE
      if (!TS_CONF_set_crypto_device(conf, section, engine))
          goto end;
  # endif
      if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx))
          goto end;
      if (!TS_CONF_set_certs(conf, section, chain, resp_ctx))
          goto end;
      if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))
          goto end;
  
      if (md) {
          if (!TS_RESP_CTX_set_signer_digest(resp_ctx, md))
              goto end;
      } else if (!TS_CONF_set_signer_digest(conf, section, NULL, resp_ctx)) {
              goto end;
      }
  
      if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))
          goto end;
      if (!TS_CONF_set_policies(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_digests(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_accuracy(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_ordering(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_tsa_name(conf, section, resp_ctx))
          goto end;
      if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx))
          goto end;
      if ((response = TS_RESP_create_response(resp_ctx, query_bio)) == NULL)
          goto end;
      ret = 1;
  
   end:
      if (!ret) {
          TS_RESP_free(response);
          response = NULL;
      }
      TS_RESP_CTX_free(resp_ctx);
      BIO_free_all(query_bio);
      return response;
  }
  
  static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data)
  {
      const char *serial_file = (const char *)data;
      ASN1_INTEGER *serial = next_serial(serial_file);
  
      if (!serial) {
          TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                      "Error during serial number "
                                      "generation.");
          TS_RESP_CTX_add_failure_info(ctx, TS_INFO_ADD_INFO_NOT_AVAILABLE);
      } else
          save_ts_serial(serial_file, serial);
  
      return serial;
  }
  
  static ASN1_INTEGER *next_serial(const char *serialfile)
  {
      int ret = 0;
      BIO *in = NULL;
      ASN1_INTEGER *serial = NULL;
      BIGNUM *bn = NULL;
  
      if ((serial = ASN1_INTEGER_new()) == NULL)
          goto err;
  
      if ((in = BIO_new_file(serialfile, "r")) == NULL) {
          ERR_clear_error();
          BIO_printf(bio_err, "Warning: could not open file %s for "
                     "reading, using serial number: 1\n", serialfile);
          if (!ASN1_INTEGER_set(serial, 1))
              goto err;
      } else {
          char buf[1024];
          if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) {
              BIO_printf(bio_err, "unable to load number from %s\n",
                         serialfile);
              goto err;
          }
          if ((bn = ASN1_INTEGER_to_BN(serial, NULL)) == NULL)
              goto err;
          ASN1_INTEGER_free(serial);
          serial = NULL;
          if (!BN_add_word(bn, 1))
              goto err;
          if ((serial = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)
              goto err;
      }
      ret = 1;
  
   err:
      if (!ret) {
          ASN1_INTEGER_free(serial);
          serial = NULL;
      }
      BIO_free_all(in);
      BN_free(bn);
      return serial;
  }
  
  static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)
  {
      int ret = 0;
      BIO *out = NULL;
  
      if ((out = BIO_new_file(serialfile, "w")) == NULL)
          goto err;
      if (i2a_ASN1_INTEGER(out, serial) <= 0)
          goto err;
      if (BIO_puts(out, "\n") <= 0)
          goto err;
      ret = 1;
   err:
      if (!ret)
          BIO_printf(bio_err, "could not save serial number to %s\n",
                     serialfile);
      BIO_free_all(out);
      return ret;
  }
  
  
  /*
   * Verify-related method definitions.
   */
  
  static int verify_command(char *data, char *digest, char *queryfile,
                            char *in, int token_in,
                            char *CApath, char *CAfile, char *untrusted,
                            X509_VERIFY_PARAM *vpm)
  {
      BIO *in_bio = NULL;
      PKCS7 *token = NULL;
      TS_RESP *response = NULL;
      TS_VERIFY_CTX *verify_ctx = NULL;
      int ret = 0;
  
      if ((in_bio = BIO_new_file(in, "rb")) == NULL)
          goto end;
      if (token_in) {
          if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
              goto end;
      } else {
          if ((response = d2i_TS_RESP_bio(in_bio, NULL)) == NULL)
              goto end;
      }
  
      if ((verify_ctx = create_verify_ctx(data, digest, queryfile,
                                          CApath, CAfile, untrusted,
                                          vpm)) == NULL)
          goto end;
  
      ret = token_in
          ? TS_RESP_verify_token(verify_ctx, token)
          : TS_RESP_verify_response(verify_ctx, response);
  
   end:
      printf("Verification: ");
      if (ret)
          printf("OK\n");
      else {
          printf("FAILED\n");
          ERR_print_errors(bio_err);
      }
  
      BIO_free_all(in_bio);
      PKCS7_free(token);
      TS_RESP_free(response);
      TS_VERIFY_CTX_free(verify_ctx);
      return ret;
  }
  
  static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
                                          char *queryfile,
                                          char *CApath, char *CAfile,
                                          char *untrusted,
                                          X509_VERIFY_PARAM *vpm)
  {
      TS_VERIFY_CTX *ctx = NULL;
      BIO *input = NULL;
      TS_REQ *request = NULL;
      int ret = 0;
      int f = 0;
  
      if (data != NULL || digest != NULL) {
          if ((ctx = TS_VERIFY_CTX_new()) == NULL)
              goto err;
          f = TS_VFY_VERSION | TS_VFY_SIGNER;
          if (data != NULL) {
              f |= TS_VFY_DATA;
              if (TS_VERIFY_CTX_set_data(ctx, BIO_new_file(data, "rb")) == NULL)
                  goto err;
          } else if (digest != NULL) {
              long imprint_len;
              unsigned char *hexstr = string_to_hex(digest, &imprint_len);
              f |= TS_VFY_IMPRINT;
              if (TS_VERIFY_CTX_set_imprint(ctx, hexstr, imprint_len) == NULL) {
                  BIO_printf(bio_err, "invalid digest string\n");
                  goto err;
              }
          }
  
      } else if (queryfile != NULL) {
          if ((input = BIO_new_file(queryfile, "rb")) == NULL)
              goto err;
          if ((request = d2i_TS_REQ_bio(input, NULL)) == NULL)
              goto err;
          if ((ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL)) == NULL)
              goto err;
      } else
          return NULL;
  
      /* Add the signature verification flag and arguments. */
      TS_VERIFY_CTX_add_flags(ctx, f | TS_VFY_SIGNATURE);
  
      /* Initialising the X509_STORE object. */
      if (TS_VERIFY_CTX_set_store(ctx, create_cert_store(CApath, CAfile, vpm))
              == NULL)
          goto err;
  
      /* Loading untrusted certificates. */
      if (untrusted
          && TS_VERIFY_CTS_set_certs(ctx, TS_CONF_load_certs(untrusted)) == NULL)
          goto err;
      ret = 1;
  
   err:
      if (!ret) {
          TS_VERIFY_CTX_free(ctx);
          ctx = NULL;
      }
      BIO_free_all(input);
      TS_REQ_free(request);
      return ctx;
  }
  
  static X509_STORE *create_cert_store(char *CApath, char *CAfile, X509_VERIFY_PARAM *vpm)
  {
      X509_STORE *cert_ctx = NULL;
      X509_LOOKUP *lookup = NULL;
      int i;
  
      cert_ctx = X509_STORE_new();
      X509_STORE_set_verify_cb(cert_ctx, verify_cb);
      if (CApath != NULL) {
          lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
          if (lookup == NULL) {
              BIO_printf(bio_err, "memory allocation failure\n");
              goto err;
          }
          i = X509_LOOKUP_add_dir(lookup, CApath, X509_FILETYPE_PEM);
          if (!i) {
              BIO_printf(bio_err, "Error loading directory %s\n", CApath);
              goto err;
          }
      }
  
      if (CAfile != NULL) {
          lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
          if (lookup == NULL) {
              BIO_printf(bio_err, "memory allocation failure\n");
              goto err;
          }
          i = X509_LOOKUP_load_file(lookup, CAfile, X509_FILETYPE_PEM);
          if (!i) {
              BIO_printf(bio_err, "Error loading file %s\n", CAfile);
              goto err;
          }
      }
  
      if (vpm != NULL) 
          X509_STORE_set1_param(cert_ctx, vpm);
  
      return cert_ctx;
  
   err:
      X509_STORE_free(cert_ctx);
      return NULL;
  }
  
  static int verify_cb(int ok, X509_STORE_CTX *ctx)
  {
      return ok;
  }
  #endif
  