gss_wrap_size_limit(3gss) [opensolaris man page]

gss_wrap_size_limit(3GSS)			  Generic Security Services API Library Functions			 gss_wrap_size_limit(3GSS)

NAME

       gss_wrap_size_limit - allow application to determine maximum message size with resulting output token of a specified maximum size

SYNOPSIS

       cc [ flag... ] file... -lgss  [ library... ]
       #include <gssapi/gssapi.h>

       OM_uint32 gss_process_context_token(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);

DESCRIPTION

       The  gss_wrap_size_limit()  function  allows an application to determine the maximum message size that, if presented to gss_wrap() with the
       same conf_req_flag and qop_req parameters, results in an output token containing no more than req_output_size bytes. This call is  intended
       for use by applications that communicate over protocols that impose a maximum message size. It enables the application to fragment messages
       prior to applying protection. The GSS-API detects invalid QOP values when gss_wrap_size_limit() is called. This routine guarantees  only  a
       maximum message size, not the availability of specific QOP values for message protection.

       Successful  completion  of  gss_wrap_size_limit()  does	not  guarantee	that  gss_wrap()  will	be  able  to  protect  a message of length
       max_input_size bytes, since this ability might depend on the availability of system resources at the time that gss_wrap() is called.

PARAMETERS

       The parameter descriptions for gss_wrap_size_limit() are as follows:

       minor_status	  A mechanism-specific status code.

       context_handle	  A handle that refers to the security over which the messages will be sent.

       conf_req_flag	  Indicates whether gss_wrap() will be asked to apply confidential protection in addition  to  integrity  protection.  See
			  gss_wrap(3GSS) for more details.

       qop_req		  Indicates the level of protection that gss_wrap() will be asked to provide.  See gss_wrap(3GSS) for more details.

       req_output_size	  The desired maximum size for tokens emitted by gss_wrap().

       max_input_size	  The maximum input message size that can be presented to gss_wrap() to guarantee that the emitted token will be no larger
			  than req_output_size bytes.

ERRORS

       gss_wrap_size_limit() returns one of the following status codes:

       GSS_S_COMPLETE		Successful completion.

       GSS_S_NO_CONTEXT 	The referenced context could not be accessed.

       GSS_S_CONTEXT_EXPIRED	The context has expired.

       GSS_S_BAD_QOP		The specified QOP is not supported by the mechanism.

       GSS_S_FAILURE		The underlying mechanism detected an error for which no specific GSS status code is defined.   The  mechanism-spe-
				cific status code reported by means of the minor_status parameter details the error condition.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgss (32-bit)		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWgssx (64-bit) 	   |
       +-----------------------------+-----------------------------+
       |MT Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gss_wrap(3GSS), attributes(5)

       Solaris Security for Developers Guide

SunOS 5.11							    15 Jan 2003 					 gss_wrap_size_limit(3GSS)