text: /* $OpenBSD: ts.h,v 1.7 2014/07/10 22:45:58 jsing Exp $ */
  /* Written by Zoltan Glozik (zglozik@opentsa.org) for the OpenSSL
   * project 2002, 2003, 2004.
   */
  /* ====================================================================
   * Copyright (c) 2006 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).
   *
   */
  
  #ifndef HEADER_TS_H
  #define HEADER_TS_H
  
  #include <openssl/opensslconf.h>
  
  #ifndef OPENSSL_NO_BUFFER
  #include <openssl/buffer.h>
  #endif
  #ifndef OPENSSL_NO_EVP
  #include <openssl/evp.h>
  #endif
  #ifndef OPENSSL_NO_BIO
  #include <openssl/bio.h>
  #endif
  #include <openssl/stack.h>
  #include <openssl/asn1.h>
  #include <openssl/safestack.h>
  
  #ifndef OPENSSL_NO_RSA
  #include <openssl/rsa.h>
  #endif
  
  #ifndef OPENSSL_NO_DSA
  #include <openssl/dsa.h>
  #endif
  
  #ifndef OPENSSL_NO_DH
  #include <openssl/dh.h>
  #endif
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  #include <openssl/x509.h>
  #include <openssl/x509v3.h>
  
  /*
  MessageImprint ::= SEQUENCE  {
       hashAlgorithm                AlgorithmIdentifier,
       hashedMessage                OCTET STRING  }
  */
  
  typedef struct TS_msg_imprint_st {
  	X509_ALGOR *hash_algo;
  	ASN1_OCTET_STRING *hashed_msg;
  } TS_MSG_IMPRINT;
  
  /*
  TimeStampReq ::= SEQUENCE  {
     version                  INTEGER  { v1(1) },
     messageImprint           MessageImprint,
       --a hash algorithm OID and the hash value of the data to be
       --time-stamped
     reqPolicy                TSAPolicyId                OPTIONAL,
     nonce                    INTEGER                    OPTIONAL,
     certReq                  BOOLEAN                    DEFAULT FALSE,
     extensions               [0] IMPLICIT Extensions    OPTIONAL  }
  */
  
  typedef struct TS_req_st {
  	ASN1_INTEGER *version;
  	TS_MSG_IMPRINT *msg_imprint;
  	ASN1_OBJECT *policy_id;		/* OPTIONAL */
  	ASN1_INTEGER *nonce;		/* OPTIONAL */
  	ASN1_BOOLEAN cert_req;		/* DEFAULT FALSE */
  	STACK_OF(X509_EXTENSION) *extensions;	/* [0] OPTIONAL */
  } TS_REQ;
  
  /*
  Accuracy ::= SEQUENCE {
                  seconds        INTEGER           OPTIONAL,
                  millis     [0] INTEGER  (1..999) OPTIONAL,
                  micros     [1] INTEGER  (1..999) OPTIONAL  }
  */
  
  typedef struct TS_accuracy_st {
  	ASN1_INTEGER *seconds;
  	ASN1_INTEGER *millis;
  	ASN1_INTEGER *micros;
  } TS_ACCURACY;
  
  /*
  TSTInfo ::= SEQUENCE  {
      version                      INTEGER  { v1(1) },
      policy                       TSAPolicyId,
      messageImprint               MessageImprint,
        -- MUST have the same value as the similar field in
        -- TimeStampReq
      serialNumber                 INTEGER,
       -- Time-Stamping users MUST be ready to accommodate integers
       -- up to 160 bits.
      genTime                      GeneralizedTime,
      accuracy                     Accuracy                 OPTIONAL,
      ordering                     BOOLEAN             DEFAULT FALSE,
      nonce                        INTEGER                  OPTIONAL,
        -- MUST be present if the similar field was present
        -- in TimeStampReq.  In that case it MUST have the same value.
      tsa                          [0] GeneralName          OPTIONAL,
      extensions                   [1] IMPLICIT Extensions  OPTIONAL   }
  */
  
  typedef struct TS_tst_info_st {
  	ASN1_INTEGER *version;
  	ASN1_OBJECT *policy_id;
  	TS_MSG_IMPRINT *msg_imprint;
  	ASN1_INTEGER *serial;
  	ASN1_GENERALIZEDTIME *time;
  	TS_ACCURACY *accuracy;
  	ASN1_BOOLEAN ordering;
  	ASN1_INTEGER *nonce;
  	GENERAL_NAME *tsa;
  	STACK_OF(X509_EXTENSION) *extensions;
  } TS_TST_INFO;
  
  /*
  PKIStatusInfo ::= SEQUENCE {
      status        PKIStatus,
      statusString  PKIFreeText     OPTIONAL,
      failInfo      PKIFailureInfo  OPTIONAL  }
  
  From RFC 1510 - section 3.1.1:
  PKIFreeText ::= SEQUENCE SIZE (1..MAX) OF UTF8String
  	-- text encoded as UTF-8 String (note:  each UTF8String SHOULD
  	-- include an RFC 1766 language tag to indicate the language
  	-- of the contained text)
  */
  
  /* Possible values for status. See ts_resp_print.c && ts_resp_verify.c. */
  
  #define	TS_STATUS_GRANTED			0
  #define	TS_STATUS_GRANTED_WITH_MODS		1
  #define	TS_STATUS_REJECTION			2
  #define	TS_STATUS_WAITING			3
  #define	TS_STATUS_REVOCATION_WARNING		4
  #define	TS_STATUS_REVOCATION_NOTIFICATION	5
  
  /* Possible values for failure_info. See ts_resp_print.c && ts_resp_verify.c */
  
  #define	TS_INFO_BAD_ALG			0
  #define	TS_INFO_BAD_REQUEST		2
  #define	TS_INFO_BAD_DATA_FORMAT		5
  #define	TS_INFO_TIME_NOT_AVAILABLE	14
  #define	TS_INFO_UNACCEPTED_POLICY	15
  #define	TS_INFO_UNACCEPTED_EXTENSION	16
  #define	TS_INFO_ADD_INFO_NOT_AVAILABLE	17
  #define	TS_INFO_SYSTEM_FAILURE		25
  
  typedef struct TS_status_info_st {
  	ASN1_INTEGER *status;
  	STACK_OF(ASN1_UTF8STRING) *text;
  	ASN1_BIT_STRING *failure_info;
  } TS_STATUS_INFO;
  
  DECLARE_STACK_OF(ASN1_UTF8STRING)
  
  /*
  TimeStampResp ::= SEQUENCE  {
       status                  PKIStatusInfo,
       timeStampToken          TimeStampToken     OPTIONAL }
  */
  
  typedef struct TS_resp_st {
  	TS_STATUS_INFO *status_info;
  	PKCS7 *token;
  	TS_TST_INFO *tst_info;
  } TS_RESP;
  
  /* The structure below would belong to the ESS component. */
  
  /*
  IssuerSerial ::= SEQUENCE {
  	issuer                   GeneralNames,
  	serialNumber             CertificateSerialNumber
  	}
  */
  
  typedef struct ESS_issuer_serial {
  	STACK_OF(GENERAL_NAME)	*issuer;
  	ASN1_INTEGER		*serial;
  } ESS_ISSUER_SERIAL;
  
  /*
  ESSCertID ::=  SEQUENCE {
          certHash                 Hash,
          issuerSerial             IssuerSerial OPTIONAL
  }
  */
  
  typedef struct ESS_cert_id {
  	ASN1_OCTET_STRING *hash;	/* Always SHA-1 digest. */
  	ESS_ISSUER_SERIAL *issuer_serial;
  } ESS_CERT_ID;
  
  DECLARE_STACK_OF(ESS_CERT_ID)
  
  /*
  SigningCertificate ::=  SEQUENCE {
         certs        SEQUENCE OF ESSCertID,
         policies     SEQUENCE OF PolicyInformation OPTIONAL
  }
  */
  
  typedef struct ESS_signing_cert {
  	STACK_OF(ESS_CERT_ID) *cert_ids;
  	STACK_OF(POLICYINFO) *policy_info;
  } ESS_SIGNING_CERT;
  
  
  TS_REQ	*TS_REQ_new(void);
  void	TS_REQ_free(TS_REQ *a);
  int	i2d_TS_REQ(const TS_REQ *a, unsigned char **pp);
  TS_REQ	*d2i_TS_REQ(TS_REQ **a, const unsigned char **pp, long length);
  
  TS_REQ	*TS_REQ_dup(TS_REQ *a);
  
  TS_REQ	*d2i_TS_REQ_fp(FILE *fp, TS_REQ **a);
  int	i2d_TS_REQ_fp(FILE *fp, TS_REQ *a);
  TS_REQ	*d2i_TS_REQ_bio(BIO *fp, TS_REQ **a);
  int	i2d_TS_REQ_bio(BIO *fp, TS_REQ *a);
  
  TS_MSG_IMPRINT	*TS_MSG_IMPRINT_new(void);
  void		TS_MSG_IMPRINT_free(TS_MSG_IMPRINT *a);
  int		i2d_TS_MSG_IMPRINT(const TS_MSG_IMPRINT *a, unsigned char **pp);
  TS_MSG_IMPRINT	*d2i_TS_MSG_IMPRINT(TS_MSG_IMPRINT **a,
  		    const unsigned char **pp, long length);
  
  TS_MSG_IMPRINT	*TS_MSG_IMPRINT_dup(TS_MSG_IMPRINT *a);
  
  TS_MSG_IMPRINT	*d2i_TS_MSG_IMPRINT_fp(FILE *fp, TS_MSG_IMPRINT **a);
  int		i2d_TS_MSG_IMPRINT_fp(FILE *fp, TS_MSG_IMPRINT *a);
  TS_MSG_IMPRINT	*d2i_TS_MSG_IMPRINT_bio(BIO *fp, TS_MSG_IMPRINT **a);
  int		i2d_TS_MSG_IMPRINT_bio(BIO *fp, TS_MSG_IMPRINT *a);
  
  TS_RESP	*TS_RESP_new(void);
  void	TS_RESP_free(TS_RESP *a);
  int	i2d_TS_RESP(const TS_RESP *a, unsigned char **pp);
  TS_RESP	*d2i_TS_RESP(TS_RESP **a, const unsigned char **pp, long length);
  TS_TST_INFO *PKCS7_to_TS_TST_INFO(PKCS7 *token);
  TS_RESP	*TS_RESP_dup(TS_RESP *a);
  
  TS_RESP	*d2i_TS_RESP_fp(FILE *fp, TS_RESP **a);
  int	i2d_TS_RESP_fp(FILE *fp, TS_RESP *a);
  TS_RESP	*d2i_TS_RESP_bio(BIO *fp, TS_RESP **a);
  int	i2d_TS_RESP_bio(BIO *fp, TS_RESP *a);
  
  TS_STATUS_INFO	*TS_STATUS_INFO_new(void);
  void		TS_STATUS_INFO_free(TS_STATUS_INFO *a);
  int		i2d_TS_STATUS_INFO(const TS_STATUS_INFO *a, unsigned char **pp);
  TS_STATUS_INFO	*d2i_TS_STATUS_INFO(TS_STATUS_INFO **a,
  		    const unsigned char **pp, long length);
  TS_STATUS_INFO	*TS_STATUS_INFO_dup(TS_STATUS_INFO *a);
  
  TS_TST_INFO	*TS_TST_INFO_new(void);
  void		TS_TST_INFO_free(TS_TST_INFO *a);
  int		i2d_TS_TST_INFO(const TS_TST_INFO *a, unsigned char **pp);
  TS_TST_INFO	*d2i_TS_TST_INFO(TS_TST_INFO **a, const unsigned char **pp,
  		    long length);
  TS_TST_INFO	*TS_TST_INFO_dup(TS_TST_INFO *a);
  
  TS_TST_INFO	*d2i_TS_TST_INFO_fp(FILE *fp, TS_TST_INFO **a);
  int		i2d_TS_TST_INFO_fp(FILE *fp, TS_TST_INFO *a);
  TS_TST_INFO	*d2i_TS_TST_INFO_bio(BIO *fp, TS_TST_INFO **a);
  int		i2d_TS_TST_INFO_bio(BIO *fp, TS_TST_INFO *a);
  
  TS_ACCURACY	*TS_ACCURACY_new(void);
  void		TS_ACCURACY_free(TS_ACCURACY *a);
  int		i2d_TS_ACCURACY(const TS_ACCURACY *a, unsigned char **pp);
  TS_ACCURACY	*d2i_TS_ACCURACY(TS_ACCURACY **a, const unsigned char **pp,
  		    long length);
  TS_ACCURACY	*TS_ACCURACY_dup(TS_ACCURACY *a);
  
  ESS_ISSUER_SERIAL *ESS_ISSUER_SERIAL_new(void);
  void		  ESS_ISSUER_SERIAL_free(ESS_ISSUER_SERIAL *a);
  int		  i2d_ESS_ISSUER_SERIAL(const ESS_ISSUER_SERIAL *a,
  		    unsigned char **pp);
  ESS_ISSUER_SERIAL *d2i_ESS_ISSUER_SERIAL(ESS_ISSUER_SERIAL **a,
  		    const unsigned char **pp, long length);
  ESS_ISSUER_SERIAL *ESS_ISSUER_SERIAL_dup(ESS_ISSUER_SERIAL *a);
  
  ESS_CERT_ID	*ESS_CERT_ID_new(void);
  void		ESS_CERT_ID_free(ESS_CERT_ID *a);
  int		i2d_ESS_CERT_ID(const ESS_CERT_ID *a, unsigned char **pp);
  ESS_CERT_ID	*d2i_ESS_CERT_ID(ESS_CERT_ID **a, const unsigned char **pp,
  		    long length);
  ESS_CERT_ID	*ESS_CERT_ID_dup(ESS_CERT_ID *a);
  
  ESS_SIGNING_CERT *ESS_SIGNING_CERT_new(void);
  void		 ESS_SIGNING_CERT_free(ESS_SIGNING_CERT *a);
  int		 i2d_ESS_SIGNING_CERT(const ESS_SIGNING_CERT *a,
  		    unsigned char **pp);
  ESS_SIGNING_CERT *d2i_ESS_SIGNING_CERT(ESS_SIGNING_CERT **a,
  		    const unsigned char **pp, long length);
  ESS_SIGNING_CERT *ESS_SIGNING_CERT_dup(ESS_SIGNING_CERT *a);
  
  void ERR_load_TS_strings(void);
  
  int TS_REQ_set_version(TS_REQ *a, long version);
  long TS_REQ_get_version(const TS_REQ *a);
  
  int TS_REQ_set_msg_imprint(TS_REQ *a, TS_MSG_IMPRINT *msg_imprint);
  TS_MSG_IMPRINT *TS_REQ_get_msg_imprint(TS_REQ *a);
  
  int TS_MSG_IMPRINT_set_algo(TS_MSG_IMPRINT *a, X509_ALGOR *alg);
  X509_ALGOR *TS_MSG_IMPRINT_get_algo(TS_MSG_IMPRINT *a);
  
  int TS_MSG_IMPRINT_set_msg(TS_MSG_IMPRINT *a, unsigned char *d, int len);
  ASN1_OCTET_STRING *TS_MSG_IMPRINT_get_msg(TS_MSG_IMPRINT *a);
  
  int TS_REQ_set_policy_id(TS_REQ *a, ASN1_OBJECT *policy);
  ASN1_OBJECT *TS_REQ_get_policy_id(TS_REQ *a);
  
  int TS_REQ_set_nonce(TS_REQ *a, const ASN1_INTEGER *nonce);
  const ASN1_INTEGER *TS_REQ_get_nonce(const TS_REQ *a);
  
  int TS_REQ_set_cert_req(TS_REQ *a, int cert_req);
  int TS_REQ_get_cert_req(const TS_REQ *a);
  
  STACK_OF(X509_EXTENSION) *TS_REQ_get_exts(TS_REQ *a);
  void TS_REQ_ext_free(TS_REQ *a);
  int TS_REQ_get_ext_count(TS_REQ *a);
  int TS_REQ_get_ext_by_NID(TS_REQ *a, int nid, int lastpos);
  int TS_REQ_get_ext_by_OBJ(TS_REQ *a, ASN1_OBJECT *obj, int lastpos);
  int TS_REQ_get_ext_by_critical(TS_REQ *a, int crit, int lastpos);
  X509_EXTENSION *TS_REQ_get_ext(TS_REQ *a, int loc);
  X509_EXTENSION *TS_REQ_delete_ext(TS_REQ *a, int loc);
  int TS_REQ_add_ext(TS_REQ *a, X509_EXTENSION *ex, int loc);
  void *TS_REQ_get_ext_d2i(TS_REQ *a, int nid, int *crit, int *idx);
  
  /* Function declarations for TS_REQ defined in ts/ts_req_print.c */
  
  int TS_REQ_print_bio(BIO *bio, TS_REQ *a);
  
  /* Function declarations for TS_RESP defined in ts/ts_resp_utils.c */
  
  int TS_RESP_set_status_info(TS_RESP *a, TS_STATUS_INFO *info);
  TS_STATUS_INFO *TS_RESP_get_status_info(TS_RESP *a);
  
  /* Caller loses ownership of PKCS7 and TS_TST_INFO objects. */
  void TS_RESP_set_tst_info(TS_RESP *a, PKCS7 *p7, TS_TST_INFO *tst_info);
  PKCS7 *TS_RESP_get_token(TS_RESP *a);
  TS_TST_INFO *TS_RESP_get_tst_info(TS_RESP *a);
  
  int TS_TST_INFO_set_version(TS_TST_INFO *a, long version);
  long TS_TST_INFO_get_version(const TS_TST_INFO *a);
  
  int TS_TST_INFO_set_policy_id(TS_TST_INFO *a, ASN1_OBJECT *policy_id);
  ASN1_OBJECT *TS_TST_INFO_get_policy_id(TS_TST_INFO *a);
  
  int TS_TST_INFO_set_msg_imprint(TS_TST_INFO *a, TS_MSG_IMPRINT *msg_imprint);
  TS_MSG_IMPRINT *TS_TST_INFO_get_msg_imprint(TS_TST_INFO *a);
  
  int TS_TST_INFO_set_serial(TS_TST_INFO *a, const ASN1_INTEGER *serial);
  const ASN1_INTEGER *TS_TST_INFO_get_serial(const TS_TST_INFO *a);
  
  int TS_TST_INFO_set_time(TS_TST_INFO *a, const ASN1_GENERALIZEDTIME *gtime);
  const ASN1_GENERALIZEDTIME *TS_TST_INFO_get_time(const TS_TST_INFO *a);
  
  int TS_TST_INFO_set_accuracy(TS_TST_INFO *a, TS_ACCURACY *accuracy);
  TS_ACCURACY *TS_TST_INFO_get_accuracy(TS_TST_INFO *a);
  
  int TS_ACCURACY_set_seconds(TS_ACCURACY *a, const ASN1_INTEGER *seconds);
  const ASN1_INTEGER *TS_ACCURACY_get_seconds(const TS_ACCURACY *a);
  
  int TS_ACCURACY_set_millis(TS_ACCURACY *a, const ASN1_INTEGER *millis);
  const ASN1_INTEGER *TS_ACCURACY_get_millis(const TS_ACCURACY *a);
  
  int TS_ACCURACY_set_micros(TS_ACCURACY *a, const ASN1_INTEGER *micros);
  const ASN1_INTEGER *TS_ACCURACY_get_micros(const TS_ACCURACY *a);
  
  int TS_TST_INFO_set_ordering(TS_TST_INFO *a, int ordering);
  int TS_TST_INFO_get_ordering(const TS_TST_INFO *a);
  
  int TS_TST_INFO_set_nonce(TS_TST_INFO *a, const ASN1_INTEGER *nonce);
  const ASN1_INTEGER *TS_TST_INFO_get_nonce(const TS_TST_INFO *a);
  
  int TS_TST_INFO_set_tsa(TS_TST_INFO *a, GENERAL_NAME *tsa);
  GENERAL_NAME *TS_TST_INFO_get_tsa(TS_TST_INFO *a);
  
  STACK_OF(X509_EXTENSION) *TS_TST_INFO_get_exts(TS_TST_INFO *a);
  void TS_TST_INFO_ext_free(TS_TST_INFO *a);
  int TS_TST_INFO_get_ext_count(TS_TST_INFO *a);
  int TS_TST_INFO_get_ext_by_NID(TS_TST_INFO *a, int nid, int lastpos);
  int TS_TST_INFO_get_ext_by_OBJ(TS_TST_INFO *a, ASN1_OBJECT *obj, int lastpos);
  int TS_TST_INFO_get_ext_by_critical(TS_TST_INFO *a, int crit, int lastpos);
  X509_EXTENSION *TS_TST_INFO_get_ext(TS_TST_INFO *a, int loc);
  X509_EXTENSION *TS_TST_INFO_delete_ext(TS_TST_INFO *a, int loc);
  int TS_TST_INFO_add_ext(TS_TST_INFO *a, X509_EXTENSION *ex, int loc);
  void *TS_TST_INFO_get_ext_d2i(TS_TST_INFO *a, int nid, int *crit, int *idx);
  
  /* Declarations related to response generation, defined in ts/ts_resp_sign.c. */
  
  /* Optional flags for response generation. */
  
  /* Don't include the TSA name in response. */
  #define	TS_TSA_NAME		0x01
  
  /* Set ordering to true in response. */
  #define	TS_ORDERING		0x02
  
  /*
   * Include the signer certificate and the other specified certificates in
   * the ESS signing certificate attribute beside the PKCS7 signed data.
   * Only the signer certificates is included by default.
   */
  #define	TS_ESS_CERT_ID_CHAIN	0x04
  
  /* Forward declaration. */
  struct TS_resp_ctx;
  
  /* This must return a unique number less than 160 bits long. */
  typedef ASN1_INTEGER *(*TS_serial_cb)(struct TS_resp_ctx *, void *);
  
  /* This must return the seconds and microseconds since Jan 1, 1970 in
     the sec and usec variables allocated by the caller.
     Return non-zero for success and zero for failure. */
  typedef	int (*TS_time_cb)(struct TS_resp_ctx *, void *, time_t *sec, long *usec);
  
  /* This must process the given extension.
   * It can modify the TS_TST_INFO object of the context.
   * Return values: !0 (processed), 0 (error, it must set the
   * status info/failure info of the response).
   */
  typedef	int (*TS_extension_cb)(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  
  typedef struct TS_resp_ctx {
  	X509		*signer_cert;
  	EVP_PKEY	*signer_key;
  	STACK_OF(X509)	*certs;	/* Certs to include in signed data. */
  	STACK_OF(ASN1_OBJECT)	*policies;	/* Acceptable policies. */
  	ASN1_OBJECT	*default_policy; /* It may appear in policies, too. */
  	STACK_OF(EVP_MD)	*mds;	/* Acceptable message digests. */
  	ASN1_INTEGER	*seconds;	/* accuracy, 0 means not specified. */
  	ASN1_INTEGER	*millis;	/* accuracy, 0 means not specified. */
  	ASN1_INTEGER	*micros;	/* accuracy, 0 means not specified. */
  	unsigned	clock_precision_digits; /* fraction of seconds in
  						   time stamp token. */
  	unsigned	flags;		/* Optional info, see values above. */
  
  	/* Callback functions. */
  	TS_serial_cb serial_cb;
  	void *serial_cb_data;	/* User data for serial_cb. */
  
  	TS_time_cb time_cb;
  	void *time_cb_data;	/* User data for time_cb. */
  
  	TS_extension_cb extension_cb;
  	void *extension_cb_data;	/* User data for extension_cb. */
  
  	/* These members are used only while creating the response. */
  	TS_REQ		*request;
  	TS_RESP		*response;
  	TS_TST_INFO	*tst_info;
  } TS_RESP_CTX;
  
  DECLARE_STACK_OF(EVP_MD)
  
  /* Creates a response context that can be used for generating responses. */
  TS_RESP_CTX *TS_RESP_CTX_new(void);
  void TS_RESP_CTX_free(TS_RESP_CTX *ctx);
  
  /* This parameter must be set. */
  int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer);
  
  /* This parameter must be set. */
  int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key);
  
  /* This parameter must be set. */
  int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy);
  
  /* No additional certs are included in the response by default. */
  int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs);
  
  /* Adds a new acceptable policy, only the default policy
     is accepted by default. */
  int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy);
  
  /* Adds a new acceptable message digest. Note that no message digests
     are accepted by default. The md argument is shared with the caller. */
  int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md);
  
  /* Accuracy is not included by default. */
  int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
      int secs, int millis, int micros);
  
  /* Clock precision digits, i.e. the number of decimal digits:
     '0' means sec, '3' msec, '6' usec, and so on. Default is 0. */
  int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
      unsigned clock_precision_digits);
  /* At most we accept usec precision. */
  #define TS_MAX_CLOCK_PRECISION_DIGITS	6
  
  /* No flags are set by default. */
  void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags);
  
  /* Default callback always returns a constant. */
  void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data);
  
  /* Default callback rejects all extensions. The extension callback is called
   * when the TS_TST_INFO object is already set up and not signed yet. */
  /* FIXME: extension handling is not tested yet. */
  void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
      TS_extension_cb cb, void *data);
  
  /* The following methods can be used in the callbacks. */
  int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
      int status, const char *text);
  
  /* Sets the status info only if it is still TS_STATUS_GRANTED. */
  int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
      int status, const char *text);
  
  int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure);
  
  /* The get methods below can be used in the extension callback. */
  TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx);
  
  TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx);
  
  /*
   * Creates the signed TS_TST_INFO and puts it in TS_RESP.
   * In case of errors it sets the status info properly.
   * Returns NULL only in case of memory allocation/fatal error.
   */
  TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio);
  
  /*
   * Declarations related to response verification,
   * they are defined in ts/ts_resp_verify.c.
   */
  
  int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
      X509_STORE *store, X509 **signer_out);
  
  /* Context structure for the generic verify method. */
  
  /* Verify the signer's certificate and the signature of the response. */
  #define	TS_VFY_SIGNATURE	(1u << 0)
  /* Verify the version number of the response. */
  #define	TS_VFY_VERSION		(1u << 1)
  /* Verify if the policy supplied by the user matches the policy of the TSA. */
  #define	TS_VFY_POLICY		(1u << 2)
  /* Verify the message imprint provided by the user. This flag should not be
     specified with TS_VFY_DATA. */
  #define	TS_VFY_IMPRINT		(1u << 3)
  /* Verify the message imprint computed by the verify method from the user
     provided data and the MD algorithm of the response. This flag should not be
     specified with TS_VFY_IMPRINT. */
  #define	TS_VFY_DATA		(1u << 4)
  /* Verify the nonce value. */
  #define	TS_VFY_NONCE		(1u << 5)
  /* Verify if the TSA name field matches the signer certificate. */
  #define	TS_VFY_SIGNER		(1u << 6)
  /* Verify if the TSA name field equals to the user provided name. */
  #define	TS_VFY_TSA_NAME		(1u << 7)
  
  /* You can use the following convenience constants. */
  #define	TS_VFY_ALL_IMPRINT	(TS_VFY_SIGNATURE	\
  				 | TS_VFY_VERSION	\
  				 | TS_VFY_POLICY	\
  				 | TS_VFY_IMPRINT	\
  				 | TS_VFY_NONCE		\
  				 | TS_VFY_SIGNER	\
  				 | TS_VFY_TSA_NAME)
  #define	TS_VFY_ALL_DATA		(TS_VFY_SIGNATURE	\
  				 | TS_VFY_VERSION	\
  				 | TS_VFY_POLICY	\
  				 | TS_VFY_DATA		\
  				 | TS_VFY_NONCE		\
  				 | TS_VFY_SIGNER	\
  				 | TS_VFY_TSA_NAME)
  
  typedef struct TS_verify_ctx {
  	/* Set this to the union of TS_VFY_... flags you want to carry out. */
  	unsigned	flags;
  
  	/* Must be set only with TS_VFY_SIGNATURE. certs is optional. */
  	X509_STORE	*store;
  	STACK_OF(X509)	*certs;
  
  	/* Must be set only with TS_VFY_POLICY. */
  	ASN1_OBJECT	*policy;
  
  	/* Must be set only with TS_VFY_IMPRINT. If md_alg is NULL,
  	   the algorithm from the response is used. */
  	X509_ALGOR	*md_alg;
  	unsigned char	*imprint;
  	unsigned	imprint_len;
  
  	/* Must be set only with TS_VFY_DATA. */
  	BIO		*data;
  
  	/* Must be set only with TS_VFY_TSA_NAME. */
  	ASN1_INTEGER	*nonce;
  
  	/* Must be set only with TS_VFY_TSA_NAME. */
  	GENERAL_NAME	*tsa_name;
  } TS_VERIFY_CTX;
  
  int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response);
  int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token);
  
  /*
   * Declarations related to response verification context,
   * they are defined in ts/ts_verify_ctx.c.
   */
  
  /* Set all fields to zero. */
  TS_VERIFY_CTX *TS_VERIFY_CTX_new(void);
  void TS_VERIFY_CTX_init(TS_VERIFY_CTX *ctx);
  void TS_VERIFY_CTX_free(TS_VERIFY_CTX *ctx);
  void TS_VERIFY_CTX_cleanup(TS_VERIFY_CTX *ctx);
  
  /*
   * If ctx is NULL, it allocates and returns a new object, otherwise
   * it returns ctx. It initialises all the members as follows:
   * flags = TS_VFY_ALL_IMPRINT & ~(TS_VFY_TSA_NAME | TS_VFY_SIGNATURE)
   * certs = NULL
   * store = NULL
   * policy = policy from the request or NULL if absent (in this case
   *	TS_VFY_POLICY is cleared from flags as well)
   * md_alg = MD algorithm from request
   * imprint, imprint_len = imprint from request
   * data = NULL
   * nonce, nonce_len = nonce from the request or NULL if absent (in this case
   * 	TS_VFY_NONCE is cleared from flags as well)
   * tsa_name = NULL
   * Important: after calling this method TS_VFY_SIGNATURE should be added!
   */
  TS_VERIFY_CTX *TS_REQ_to_TS_VERIFY_CTX(TS_REQ *req, TS_VERIFY_CTX *ctx);
  
  /* Function declarations for TS_RESP defined in ts/ts_resp_print.c */
  
  int TS_RESP_print_bio(BIO *bio, TS_RESP *a);
  int TS_STATUS_INFO_print_bio(BIO *bio, TS_STATUS_INFO *a);
  int TS_TST_INFO_print_bio(BIO *bio, TS_TST_INFO *a);
  
  /* Common utility functions defined in ts/ts_lib.c */
  
  int TS_ASN1_INTEGER_print_bio(BIO *bio, const ASN1_INTEGER *num);
  int TS_OBJ_print_bio(BIO *bio, const ASN1_OBJECT *obj);
  int TS_ext_print_bio(BIO *bio, const STACK_OF(X509_EXTENSION) *extensions);
  int TS_X509_ALGOR_print_bio(BIO *bio, const X509_ALGOR *alg);
  int TS_MSG_IMPRINT_print_bio(BIO *bio, TS_MSG_IMPRINT *msg);
  
  /* Function declarations for handling configuration options,
     defined in ts/ts_conf.c */
  
  X509 *TS_CONF_load_cert(const char *file);
  STACK_OF(X509) *TS_CONF_load_certs(const char *file);
  EVP_PKEY *TS_CONF_load_key(const char *file, const char *pass);
  const char *TS_CONF_get_tsa_section(CONF *conf, const char *section);
  int TS_CONF_set_serial(CONF *conf, const char *section, TS_serial_cb cb,
      TS_RESP_CTX *ctx);
  int TS_CONF_set_crypto_device(CONF *conf, const char *section,
      const char *device);
  int TS_CONF_set_default_engine(const char *name);
  int TS_CONF_set_signer_cert(CONF *conf, const char *section,
      const char *cert, TS_RESP_CTX *ctx);
  int TS_CONF_set_certs(CONF *conf, const char *section, const char *certs,
      TS_RESP_CTX *ctx);
  int TS_CONF_set_signer_key(CONF *conf, const char *section,
      const char *key, const char *pass, TS_RESP_CTX *ctx);
  int TS_CONF_set_def_policy(CONF *conf, const char *section,
      const char *policy, TS_RESP_CTX *ctx);
  int TS_CONF_set_policies(CONF *conf, const char *section, TS_RESP_CTX *ctx);
  int TS_CONF_set_digests(CONF *conf, const char *section, TS_RESP_CTX *ctx);
  int TS_CONF_set_accuracy(CONF *conf, const char *section, TS_RESP_CTX *ctx);
  int TS_CONF_set_clock_precision_digits(CONF *conf, const char *section,
      TS_RESP_CTX *ctx);
  int TS_CONF_set_ordering(CONF *conf, const char *section, TS_RESP_CTX *ctx);
  int TS_CONF_set_tsa_name(CONF *conf, const char *section, TS_RESP_CTX *ctx);
  int TS_CONF_set_ess_cert_id_chain(CONF *conf, const char *section,
      TS_RESP_CTX *ctx);
  
  /* -------------------------------------------------- */
  /* BEGIN ERROR CODES */
  /* The following lines are auto generated by the script mkerr.pl. Any changes
   * made after this point may be overwritten when the script is next run.
   */
  void ERR_load_TS_strings(void);
  
  /* Error codes for the TS functions. */
  
  /* Function codes. */
  #define TS_F_D2I_TS_RESP				 147
  #define TS_F_DEF_SERIAL_CB				 110
  #define TS_F_DEF_TIME_CB				 111
  #define TS_F_ESS_ADD_SIGNING_CERT			 112
  #define TS_F_ESS_CERT_ID_NEW_INIT			 113
  #define TS_F_ESS_SIGNING_CERT_NEW_INIT			 114
  #define TS_F_INT_TS_RESP_VERIFY_TOKEN			 149
  #define TS_F_PKCS7_TO_TS_TST_INFO			 148
  #define TS_F_TS_ACCURACY_SET_MICROS			 115
  #define TS_F_TS_ACCURACY_SET_MILLIS			 116
  #define TS_F_TS_ACCURACY_SET_SECONDS			 117
  #define TS_F_TS_CHECK_IMPRINTS				 100
  #define TS_F_TS_CHECK_NONCES				 101
  #define TS_F_TS_CHECK_POLICY				 102
  #define TS_F_TS_CHECK_SIGNING_CERTS			 103
  #define TS_F_TS_CHECK_STATUS_INFO			 104
  #define TS_F_TS_COMPUTE_IMPRINT				 145
  #define TS_F_TS_CONF_SET_DEFAULT_ENGINE			 146
  #define TS_F_TS_GET_STATUS_TEXT				 105
  #define TS_F_TS_MSG_IMPRINT_SET_ALGO			 118
  #define TS_F_TS_REQ_SET_MSG_IMPRINT			 119
  #define TS_F_TS_REQ_SET_NONCE				 120
  #define TS_F_TS_REQ_SET_POLICY_ID			 121
  #define TS_F_TS_RESP_CREATE_RESPONSE			 122
  #define TS_F_TS_RESP_CREATE_TST_INFO			 123
  #define TS_F_TS_RESP_CTX_ADD_FAILURE_INFO		 124
  #define TS_F_TS_RESP_CTX_ADD_MD				 125
  #define TS_F_TS_RESP_CTX_ADD_POLICY			 126
  #define TS_F_TS_RESP_CTX_NEW				 127
  #define TS_F_TS_RESP_CTX_SET_ACCURACY			 128
  #define TS_F_TS_RESP_CTX_SET_CERTS			 129
  #define TS_F_TS_RESP_CTX_SET_DEF_POLICY			 130
  #define TS_F_TS_RESP_CTX_SET_SIGNER_CERT		 131
  #define TS_F_TS_RESP_CTX_SET_STATUS_INFO		 132
  #define TS_F_TS_RESP_GET_POLICY				 133
  #define TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION		 134
  #define TS_F_TS_RESP_SET_STATUS_INFO			 135
  #define TS_F_TS_RESP_SET_TST_INFO			 150
  #define TS_F_TS_RESP_SIGN				 136
  #define TS_F_TS_RESP_VERIFY_SIGNATURE			 106
  #define TS_F_TS_RESP_VERIFY_TOKEN			 107
  #define TS_F_TS_TST_INFO_SET_ACCURACY			 137
  #define TS_F_TS_TST_INFO_SET_MSG_IMPRINT		 138
  #define TS_F_TS_TST_INFO_SET_NONCE			 139
  #define TS_F_TS_TST_INFO_SET_POLICY_ID			 140
  #define TS_F_TS_TST_INFO_SET_SERIAL			 141
  #define TS_F_TS_TST_INFO_SET_TIME			 142
  #define TS_F_TS_TST_INFO_SET_TSA			 143
  #define TS_F_TS_VERIFY					 108
  #define TS_F_TS_VERIFY_CERT				 109
  #define TS_F_TS_VERIFY_CTX_NEW				 144
  
  /* Reason codes. */
  #define TS_R_BAD_PKCS7_TYPE				 132
  #define TS_R_BAD_TYPE					 133
  #define TS_R_CERTIFICATE_VERIFY_ERROR			 100
  #define TS_R_COULD_NOT_SET_ENGINE			 127
  #define TS_R_COULD_NOT_SET_TIME				 115
  #define TS_R_D2I_TS_RESP_INT_FAILED			 128
  #define TS_R_DETACHED_CONTENT				 134
  #define TS_R_ESS_ADD_SIGNING_CERT_ERROR			 116
  #define TS_R_ESS_SIGNING_CERTIFICATE_ERROR		 101
  #define TS_R_INVALID_NULL_POINTER			 102
  #define TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE		 117
  #define TS_R_MESSAGE_IMPRINT_MISMATCH			 103
  #define TS_R_NONCE_MISMATCH				 104
  #define TS_R_NONCE_NOT_RETURNED				 105
  #define TS_R_NO_CONTENT					 106
  #define TS_R_NO_TIME_STAMP_TOKEN			 107
  #define TS_R_PKCS7_ADD_SIGNATURE_ERROR			 118
  #define TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR		 119
  #define TS_R_PKCS7_TO_TS_TST_INFO_FAILED		 129
  #define TS_R_POLICY_MISMATCH				 108
  #define TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE	 120
  #define TS_R_RESPONSE_SETUP_ERROR			 121
  #define TS_R_SIGNATURE_FAILURE				 109
  #define TS_R_THERE_MUST_BE_ONE_SIGNER			 110
  #define TS_R_TIME_SYSCALL_ERROR				 122
  #define TS_R_TOKEN_NOT_PRESENT				 130
  #define TS_R_TOKEN_PRESENT				 131
  #define TS_R_TSA_NAME_MISMATCH				 111
  #define TS_R_TSA_UNTRUSTED				 112
  #define TS_R_TST_INFO_SETUP_ERROR			 123
  #define TS_R_TS_DATASIGN				 124
  #define TS_R_UNACCEPTABLE_POLICY			 125
  #define TS_R_UNSUPPORTED_MD_ALGORITHM			 126
  #define TS_R_UNSUPPORTED_VERSION			 113
  #define TS_R_WRONG_CONTENT_TYPE				 114
  
  #ifdef  __cplusplus
  }
  #endif
  #endif
  