/* api.h --- Header file for GSS-API.
 * Copyright (C) 2003-2014 Simon Josefsson
 *
 * This file is part of the Generic Security Service (GSS).
 *
 * GSS is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GSS is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GSS; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301, USA.
 *
 */

/*
 * This file was extracted by Simon Josefsson, for the GSS project,
 * from RFC 2744, written by John Wray.  It has been changed slightly.
 * We believe using code from RFCs is within acceptable use.
 */

#ifndef GSSAPI_H_
#define GSSAPI_H_

/*
 * First, include stddef.h to get size_t defined.
 */
#include <stddef.h>

/*
 * Now define the three implementation-dependent types.
 */
typedef struct gss_ctx_id_struct *gss_ctx_id_t;
typedef struct gss_cred_id_struct *gss_cred_id_t;
typedef struct gss_name_struct *gss_name_t;

/*
 * The following type must be defined as the smallest natural
 * unsigned integer supported by the platform that has at least
 * 32 bits of precision.
 */
#include <limits.h>
#if USHRT_MAX >= 4294967295
typedef unsigned short gss_uint32;
#elif UINT_MAX >= 4294967295
typedef unsigned int gss_uint32;
#else /* unsigned long's must be at least 32 bits according to K&R */
typedef unsigned long gss_uint32;
#endif

/*
 * We don't use X/Open definitions, so roll our own.
 */

typedef gss_uint32 OM_uint32;

typedef struct gss_OID_desc_struct
{
  OM_uint32 length;
  void *elements;
} gss_OID_desc, *gss_OID;

typedef struct gss_OID_set_desc_struct
{
  size_t count;
  gss_OID elements;
} gss_OID_set_desc, *gss_OID_set;

typedef struct gss_buffer_desc_struct
{
  size_t length;
  void *value;
} gss_buffer_desc, *gss_buffer_t;

typedef struct gss_channel_bindings_struct
{
  OM_uint32 initiator_addrtype;
  gss_buffer_desc initiator_address;
  OM_uint32 acceptor_addrtype;
  gss_buffer_desc acceptor_address;
  gss_buffer_desc application_data;
} *gss_channel_bindings_t;

/*
 * For now, define a QOP-type as an OM_uint32
 */
typedef OM_uint32 gss_qop_t;

typedef int gss_cred_usage_t;

/*
 * Flag bits for context-level services.
 */
#define GSS_C_DELEG_FLAG      1
#define GSS_C_MUTUAL_FLAG     2
#define GSS_C_REPLAY_FLAG     4
#define GSS_C_SEQUENCE_FLAG   8
#define GSS_C_CONF_FLAG       16
#define GSS_C_INTEG_FLAG      32
#define GSS_C_ANON_FLAG       64
#define GSS_C_PROT_READY_FLAG 128
#define GSS_C_TRANS_FLAG      256

/*
 * Credential usage options
 */
#define GSS_C_BOTH     0
#define GSS_C_INITIATE 1
#define GSS_C_ACCEPT   2

/*
 * Status code types for gss_display_status
 */
#define GSS_C_GSS_CODE  1
#define GSS_C_MECH_CODE 2

/*
 * The constant definitions for channel-bindings address families
 */
#define GSS_C_AF_UNSPEC     0
#define GSS_C_AF_LOCAL      1
#define GSS_C_AF_INET       2
#define GSS_C_AF_IMPLINK    3
#define GSS_C_AF_PUP        4
#define GSS_C_AF_CHAOS      5
#define GSS_C_AF_NS         6
#define GSS_C_AF_NBS        7
#define GSS_C_AF_ECMA       8
#define GSS_C_AF_DATAKIT    9
#define GSS_C_AF_CCITT      10
#define GSS_C_AF_SNA        11
#define GSS_C_AF_DECnet     12
#define GSS_C_AF_DLI        13
#define GSS_C_AF_LAT        14
#define GSS_C_AF_HYLINK     15
#define GSS_C_AF_APPLETALK  16
#define GSS_C_AF_BSC        17
#define GSS_C_AF_DSS        18
#define GSS_C_AF_OSI        19
#define GSS_C_AF_X25        21

#define GSS_C_AF_NULLADDR   255

/*
 * Various Null values
 */
#define GSS_C_NO_NAME ((gss_name_t) 0)
#define GSS_C_NO_BUFFER ((gss_buffer_t) 0)
#define GSS_C_NO_OID ((gss_OID) 0)
#define GSS_C_NO_OID_SET ((gss_OID_set) 0)
#define GSS_C_NO_CONTEXT ((gss_ctx_id_t) 0)
#define GSS_C_NO_CREDENTIAL ((gss_cred_id_t) 0)
#define GSS_C_NO_CHANNEL_BINDINGS ((gss_channel_bindings_t) 0)
#define GSS_C_EMPTY_BUFFER {0, NULL}

/*
 * Some alternate names for a couple of the above
 * values.  These are defined for V1 compatibility.
 */
#define GSS_C_NULL_OID GSS_C_NO_OID
#define GSS_C_NULL_OID_SET GSS_C_NO_OID_SET

/*
 * Define the default Quality of Protection for per-message
 * services.  Note that an implementation that offers multiple
 * levels of QOP may define GSS_C_QOP_DEFAULT to be either zero
 * (as done here) to mean "default protection", or to a specific
 * explicit QOP value.  However, a value of 0 should always be
 * interpreted by a GSS-API implementation as a request for the
 * default protection level.
 */
#define GSS_C_QOP_DEFAULT 0

/*
 * Expiration time of 2^32-1 seconds means infinite lifetime for a
 * credential or security context
 */
#define GSS_C_INDEFINITE 0xfffffffful

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 * "\x01\x02\x01\x01"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) user_name(1)}.  The constant
 * GSS_C_NT_USER_NAME should be initialized to point
 * to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_USER_NAME;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x02"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) machine_uid_name(2)}.
 * The constant GSS_C_NT_MACHINE_UID_NAME should be
 * initialized to point to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_MACHINE_UID_NAME;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x03"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) string_uid_name(3)}.
 * The constant GSS_C_NT_STRING_UID_NAME should be
 * initialized to point to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_STRING_UID_NAME;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\x01\x05\x06\x02"},
 * corresponding to an object-identifier value of
 * {iso(1) org(3) dod(6) internet(1) security(5)
 * nametypes(6) gss-host-based-services(2)).  The constant
 * GSS_C_NT_HOSTBASED_SERVICE_X should be initialized to point
 * to that gss_OID_desc.  This is a deprecated OID value, and
 * implementations wishing to support hostbased-service names
 * should instead use the GSS_C_NT_HOSTBASED_SERVICE OID,
 * defined below, to identify such names;
 * GSS_C_NT_HOSTBASED_SERVICE_X should be accepted a synonym
 * for GSS_C_NT_HOSTBASED_SERVICE when presented as an input
 * parameter, but should not be emitted by GSS-API
 * implementations
 */
extern gss_OID GSS_C_NT_HOSTBASED_SERVICE_X;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x04"}, corresponding to an
 * object-identifier value of {iso(1) member-body(2)
 * Unites States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) service_name(4)}.  The constant
 * GSS_C_NT_HOSTBASED_SERVICE should be initialized
 * to point to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_HOSTBASED_SERVICE;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\01\x05\x06\x03"},
 * corresponding to an object identifier value of
 * {1(iso), 3(org), 6(dod), 1(internet), 5(security),
 * 6(nametypes), 3(gss-anonymous-name)}.  The constant
 * and GSS_C_NT_ANONYMOUS should be initialized to point
 * to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_ANONYMOUS;


/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\x01\x05\x06\x04"},
 * corresponding to an object-identifier value of
 * {1(iso), 3(org), 6(dod), 1(internet), 5(security),
 * 6(nametypes), 4(gss-api-exported-name)}.  The constant
 * GSS_C_NT_EXPORT_NAME should be initialized to point
 * to that gss_OID_desc.
 */
extern gss_OID GSS_C_NT_EXPORT_NAME;


/* Major status codes */

#define GSS_S_COMPLETE 0

/*
 * Some "helper" definitions to make the status code macros obvious.
 */
#define GSS_C_CALLING_ERROR_OFFSET 24
#define GSS_C_ROUTINE_ERROR_OFFSET 16
#define GSS_C_SUPPLEMENTARY_OFFSET 0
#define GSS_C_CALLING_ERROR_MASK 0377ul
#define GSS_C_ROUTINE_ERROR_MASK 0377ul
#define GSS_C_SUPPLEMENTARY_MASK 0177777ul

/*
 * The macros that test status codes for error conditions.
 * Note that the GSS_ERROR() macro has changed slightly from
 * the V1 GSS-API so that it now evaluates its argument
 * only once.
 */
#define GSS_CALLING_ERROR(x) \
 (x & (GSS_C_CALLING_ERROR_MASK << GSS_C_CALLING_ERROR_OFFSET))
#define GSS_ROUTINE_ERROR(x) \
 (x & (GSS_C_ROUTINE_ERROR_MASK << GSS_C_ROUTINE_ERROR_OFFSET))
#define GSS_SUPPLEMENTARY_INFO(x) \
 (x & (GSS_C_SUPPLEMENTARY_MASK << GSS_C_SUPPLEMENTARY_OFFSET))
#define GSS_ERROR(x) \
 (x & ((GSS_C_CALLING_ERROR_MASK << GSS_C_CALLING_ERROR_OFFSET) | \
       (GSS_C_ROUTINE_ERROR_MASK << GSS_C_ROUTINE_ERROR_OFFSET)))

/*
 * Now the actual status code definitions
 */

/*
 * Calling errors:

 */
#define GSS_S_CALL_INACCESSIBLE_READ	(1ul << GSS_C_CALLING_ERROR_OFFSET)
#define GSS_S_CALL_INACCESSIBLE_WRITE	(2ul << GSS_C_CALLING_ERROR_OFFSET)
#define GSS_S_CALL_BAD_STRUCTURE	(3ul << GSS_C_CALLING_ERROR_OFFSET)

/*
 * Routine errors:
 */
#define GSS_S_BAD_MECH             (1ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_NAME             (2ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_NAMETYPE         (3ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_BINDINGS         (4ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_STATUS           (5ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_SIG              (6ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_MIC GSS_S_BAD_SIG
#define GSS_S_NO_CRED              (7ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_NO_CONTEXT           (8ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_DEFECTIVE_TOKEN      (9ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_DEFECTIVE_CREDENTIAL (10ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_CREDENTIALS_EXPIRED  (11ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_CONTEXT_EXPIRED      (12ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_FAILURE              (13ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_QOP              (14ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_UNAUTHORIZED         (15ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_UNAVAILABLE          (16ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_DUPLICATE_ELEMENT    (17ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_NAME_NOT_MN          (18ul << GSS_C_ROUTINE_ERROR_OFFSET)

/*
 * Supplementary info bits:
 */
#define GSS_S_CONTINUE_NEEDED	(1ul << (GSS_C_SUPPLEMENTARY_OFFSET + 0))
#define GSS_S_DUPLICATE_TOKEN	(1ul << (GSS_C_SUPPLEMENTARY_OFFSET + 1))
#define GSS_S_OLD_TOKEN		(1ul << (GSS_C_SUPPLEMENTARY_OFFSET + 2))
#define GSS_S_UNSEQ_TOKEN	(1ul << (GSS_C_SUPPLEMENTARY_OFFSET + 3))
#define GSS_S_GAP_TOKEN		(1ul << (GSS_C_SUPPLEMENTARY_OFFSET + 4))

/*
 * Finally, function prototypes for the GSS-API routines.
 */


OM_uint32
gss_acquire_cred (OM_uint32 * minor_status,
		  const gss_name_t desired_name,
		  OM_uint32 time_req,
		  const gss_OID_set desired_mechs,
		  gss_cred_usage_t cred_usage,
		  gss_cred_id_t * output_cred_handle,
		  gss_OID_set * actual_mechs, OM_uint32 * time_rec);

OM_uint32
gss_release_cred (OM_uint32 * minor_status, gss_cred_id_t * cred_handle);

OM_uint32
gss_init_sec_context (OM_uint32 * minor_status,
		      const gss_cred_id_t initiator_cred_handle,
		      gss_ctx_id_t * context_handle,
		      const gss_name_t target_name,
		      const gss_OID mech_type,
		      OM_uint32 req_flags,
		      OM_uint32 time_req,
		      const gss_channel_bindings_t input_chan_bindings,
		      const gss_buffer_t input_token,
		      gss_OID * actual_mech_type,
		      gss_buffer_t output_token,
		      OM_uint32 * ret_flags, OM_uint32 * time_rec);

OM_uint32
gss_accept_sec_context (OM_uint32 * minor_status,
			gss_ctx_id_t * context_handle,
			const gss_cred_id_t acceptor_cred_handle,
			const gss_buffer_t input_token_buffer,
			const gss_channel_bindings_t input_chan_bindings,
			gss_name_t * src_name,
			gss_OID * mech_type,
			gss_buffer_t output_token,
			OM_uint32 * ret_flags, OM_uint32 * time_rec,
			gss_cred_id_t * delegated_cred_handle);

OM_uint32
gss_process_context_token (OM_uint32 * minor_status,
			   const gss_ctx_id_t context_handle,
			   const gss_buffer_t token_buffer);

OM_uint32
gss_delete_sec_context (OM_uint32 * minor_status,
			gss_ctx_id_t * context_handle,
			gss_buffer_t output_token);

OM_uint32
gss_context_time (OM_uint32 * minor_status,
		  const gss_ctx_id_t context_handle, OM_uint32 * time_rec);

OM_uint32
gss_get_mic (OM_uint32 * minor_status,
	     const gss_ctx_id_t context_handle,
	     gss_qop_t qop_req,
	     const gss_buffer_t message_buffer, gss_buffer_t message_token);

OM_uint32
gss_verify_mic (OM_uint32 * minor_status,
		const gss_ctx_id_t context_handle,
		const gss_buffer_t message_buffer,
		const gss_buffer_t token_buffer, gss_qop_t * qop_state);

OM_uint32
gss_wrap (OM_uint32 * minor_status,
	  const gss_ctx_id_t context_handle,
	  int conf_req_flag,
	  gss_qop_t qop_req,
	  const gss_buffer_t input_message_buffer,
	  int *conf_state, gss_buffer_t output_message_buffer);

OM_uint32
gss_unwrap (OM_uint32 * minor_status,
	    const gss_ctx_id_t context_handle,
	    const gss_buffer_t input_message_buffer,
	    gss_buffer_t output_message_buffer,
	    int *conf_state, gss_qop_t * qop_state);

OM_uint32
gss_display_status (OM_uint32 * minor_status,
		    OM_uint32 status_value,
		    int status_type,
		    const gss_OID mech_type,
		    OM_uint32 * message_context, gss_buffer_t status_string);

OM_uint32
gss_indicate_mechs (OM_uint32 * minor_status, gss_OID_set * mech_set);

OM_uint32
gss_compare_name (OM_uint32 * minor_status,
		  const gss_name_t name1,
		  const gss_name_t name2, int *name_equal);

OM_uint32
gss_display_name (OM_uint32 * minor_status,
		  const gss_name_t input_name,
		  gss_buffer_t output_name_buffer,
		  gss_OID * output_name_type);

OM_uint32
gss_import_name (OM_uint32 * minor_status,
		 const gss_buffer_t input_name_buffer,
		 const gss_OID input_name_type, gss_name_t * output_name);

OM_uint32
gss_export_name (OM_uint32 * minor_status,
		 const gss_name_t input_name, gss_buffer_t exported_name);

OM_uint32 gss_release_name (OM_uint32 * minor_status, gss_name_t * name);

OM_uint32 gss_release_buffer (OM_uint32 * minor_status, gss_buffer_t buffer);

OM_uint32 gss_release_oid_set (OM_uint32 * minor_status, gss_OID_set * set);

OM_uint32
gss_inquire_cred (OM_uint32 * minor_status,
		  const gss_cred_id_t cred_handle,
		  gss_name_t * name,
		  OM_uint32 * lifetime,
		  gss_cred_usage_t * cred_usage, gss_OID_set * mechanisms);

OM_uint32
gss_inquire_context (OM_uint32 * minor_status,
		     const gss_ctx_id_t context_handle,
		     gss_name_t * src_name,
		     gss_name_t * targ_name,
		     OM_uint32 * lifetime_rec,
		     gss_OID * mech_type,
		     OM_uint32 * ctx_flags,
		     int *locally_initiated, int *open);

OM_uint32
gss_wrap_size_limit (OM_uint32 * minor_status,
		     const gss_ctx_id_t context_handle,
		     int conf_req_flag,
		     gss_qop_t qop_req,
		     OM_uint32 req_output_size, OM_uint32 * max_input_size);

OM_uint32
gss_add_cred (OM_uint32 * minor_status,
	      const gss_cred_id_t input_cred_handle,
	      const gss_name_t desired_name,
	      const gss_OID desired_mech,
	      gss_cred_usage_t cred_usage,
	      OM_uint32 initiator_time_req,
	      OM_uint32 acceptor_time_req,
	      gss_cred_id_t * output_cred_handle,
	      gss_OID_set * actual_mechs,
	      OM_uint32 * initiator_time_rec, OM_uint32 * acceptor_time_rec);

OM_uint32
gss_inquire_cred_by_mech (OM_uint32 * minor_status,
			  const gss_cred_id_t cred_handle,
			  const gss_OID mech_type,
			  gss_name_t * name,
			  OM_uint32 * initiator_lifetime,
			  OM_uint32 * acceptor_lifetime,
			  gss_cred_usage_t * cred_usage);

OM_uint32
gss_export_sec_context (OM_uint32 * minor_status,
			gss_ctx_id_t * context_handle,
			gss_buffer_t interprocess_token);

OM_uint32
gss_import_sec_context (OM_uint32 * minor_status,
			const gss_buffer_t interprocess_token,
			gss_ctx_id_t * context_handle);

OM_uint32
gss_create_empty_oid_set (OM_uint32 * minor_status, gss_OID_set * oid_set);

OM_uint32
gss_add_oid_set_member (OM_uint32 * minor_status,
			const gss_OID member_oid, gss_OID_set * oid_set);

OM_uint32
gss_test_oid_set_member (OM_uint32 * minor_status,
			 const gss_OID member,
			 const gss_OID_set set, int *present);

OM_uint32
gss_inquire_names_for_mech (OM_uint32 * minor_status,
			    const gss_OID mechanism,
			    gss_OID_set * name_types);

OM_uint32
gss_inquire_mechs_for_name (OM_uint32 * minor_status,
			    const gss_name_t input_name,
			    gss_OID_set * mech_types);

OM_uint32
gss_canonicalize_name (OM_uint32 * minor_status,
		       const gss_name_t input_name,
		       const gss_OID mech_type, gss_name_t * output_name);

OM_uint32
gss_duplicate_name (OM_uint32 * minor_status,
		    const gss_name_t src_name, gss_name_t * dest_name);

/*
 * The following routines are obsolete variants of gss_get_mic,
 * gss_verify_mic, gss_wrap and gss_unwrap.  They should be
 * provided by GSS-API V2 implementations for backwards
 * compatibility with V1 applications.  Distinct entrypoints
 * (as opposed to #defines) should be provided, both to allow
 * GSS-API V1 applications to link against GSS-API V2
   implementations,
 * and to retain the slight parameter type differences between the
 * obsolete versions of these routines and their current forms.
 */

OM_uint32
gss_sign (OM_uint32 * minor_status,
	  gss_ctx_id_t context_handle,
	  int qop_req,
	  gss_buffer_t message_buffer, gss_buffer_t message_token);


OM_uint32
gss_verify (OM_uint32 * minor_status,
	    gss_ctx_id_t context_handle,
	    gss_buffer_t message_buffer,
	    gss_buffer_t token_buffer, int *qop_state);

OM_uint32
gss_seal (OM_uint32 * minor_status,
	  gss_ctx_id_t context_handle,
	  int conf_req_flag,
	  int qop_req,
	  gss_buffer_t input_message_buffer,
	  int *conf_state, gss_buffer_t output_message_buffer);


OM_uint32
gss_unseal (OM_uint32 * minor_status,
	    gss_ctx_id_t context_handle,
	    gss_buffer_t input_message_buffer,
	    gss_buffer_t output_message_buffer,
	    int *conf_state, int *qop_state);

/* RFC 5801 SASL GS2 interfaces. */

OM_uint32
gss_inquire_saslname_for_mech (OM_uint32 * minor_status,
			       const gss_OID desired_mech,
			       gss_buffer_t sasl_mech_name,
			       gss_buffer_t mech_name,
			       gss_buffer_t mech_description);

OM_uint32
gss_inquire_mech_for_saslname (OM_uint32 * minor_status,
			       const gss_buffer_t sasl_mech_name,
			       gss_OID * mech_type);

/* RFC 5587 const typedefs. */

typedef const gss_buffer_desc *gss_const_buffer_t;
typedef const struct gss_channel_bindings_struct
  *gss_const_channel_bindings_t;
typedef const struct gss_ctx_id_struct *gss_const_ctx_id_t;
typedef const struct gss_cred_id_struct *gss_const_cred_id_t;
typedef const struct gss_name_struct *gss_const_name_t;
typedef const gss_OID_desc *gss_const_OID;
typedef const gss_OID_set_desc *gss_const_OID_set;

/* RFC 6339 interfaces. */

extern int
gss_oid_equal (gss_const_OID first_oid,
	       gss_const_OID second_oid);

OM_uint32
gss_encapsulate_token (gss_const_buffer_t input_token,
		       gss_const_OID token_oid,
		       gss_buffer_t output_token);

OM_uint32
gss_decapsulate_token (gss_const_buffer_t input_token,
		       gss_const_OID token_oid,
		       gss_buffer_t output_token);

#endif /* GSSAPI_H_ */
