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GSS_VERIFY_MIC(3)	      Programmer's Manual	     GSS_VERIFY_MIC(3)

NAME
     gss_verify_mic, gss_verify	-- Check a MIC against a message; verify in-
     tegrity of	a received message

SYNOPSIS
     #include <gssapi/gssapi.h>

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

DESCRIPTION
     Verifies that a cryptographic MIC,	contained in the token parameter, fits
     the supplied message.  The	qop_state parameter allows a message recipient
     to	determine the strength of protection that was applied to the message.

     Since some	application-level protocols may	wish to	use tokens emitted by
     gss_wrap()	to provide "secure framing", implementations must support the
     calculation and verification of MICs over zero-length messages.

     The gss_verify() routine is an obsolete variant of	gss_verify_mic().  It
     is	provided for backwards compatibility with applications using the GSS-
     API V1 interface.	A distinct entrypoint (as opposed to #define) is pro-
     vided, both to allow GSS-API V1 applications to link and to retain	the
     slight parameter type differences between the obsolete versions of	this
     routine and its current form.

PARAMETERS
     minor_status    Mechanism specific	status code.

     context_handle  Identifies	the context on which the message arrived.

     message_buffer  Message to	be verified.

     token_buffer    Token associated with message.

     qop_state	     Quality of	protection gained from MIC.  Specify NULL if
		     not required.

RETURN VALUES
     GSS_S_COMPLETE	    Successful completion

     GSS_S_DEFECTIVE_TOKEN  The	token failed consistency checks

     GSS_S_BAD_SIG	    The	MIC was	incorrect

     GSS_S_DUPLICATE_TOKEN  The	token was valid, and contained a correct MIC
			    for	the message, but it had	already	been processed

     GSS_S_OLD_TOKEN	    The	token was valid, and contained a correct MIC
			    for	the message, but it is too old to check	for
			    duplication

     GSS_S_UNSEQ_TOKEN	    The	token was valid, and contained a correct MIC
			    for	the message, but has been verified out of se-
			    quence; a later token has already been received.

     GSS_S_GAP_TOKEN	    The	token was valid, and contained a correct MIC
			    for	the message, but has been verified out of se-
			    quence; an earlier expected	token has not yet been
			    received

     GSS_S_CONTEXT_EXPIRED  The	context	has already expired

     GSS_S_NO_CONTEXT	    The	context_handle parameter did not identify a
			    valid context

SEE ALSO
     gss_wrap(3)

STANDARDS
     RFC 2743  Generic Security	Service	Application Program Interface Version
	       2, Update 1

     RFC 2744  Generic Security	Service	API Version 2 :	C-bindings

HISTORY
     The gss_verify_mic	function first appeared	in FreeBSD 7.0.

AUTHORS
     John Wray,	Iris Associates

COPYRIGHT
     Copyright (C) The Internet	Society	(2000).	 All Rights Reserved.

     This document and translations of it may be copied	and furnished to oth-
     ers, and derivative works that comment on or otherwise explain it or as-
     sist in its implementation	may be prepared, copied, published and dis-
     tributed, in whole	or in part, without restriction	of any kind, provided
     that the above copyright notice and this paragraph	are included on	all
     such copies and derivative	works.	However, this document itself may not
     be	modified in any	way, such as by	removing the copyright notice or ref-
     erences to	the Internet Society or	other Internet organizations, except
     as	needed for the purpose of developing Internet standards	in which case
     the procedures for	copyrights defined in the Internet Standards process
     must be followed, or as required to translate it into languages other
     than English.

     The limited permissions granted above are perpetual and will not be re-
     voked by the Internet Society or its successors or	assigns.

     This document and the information contained herein	is provided on an "AS
     IS" basis and THE INTERNET	SOCIETY	AND THE	INTERNET ENGINEERING TASK
     FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR	IMPLIED, INCLUDING BUT NOT
     LIMITED TO	ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT
     INFRINGE ANY RIGHTS OR ANY	IMPLIED	WARRANTIES OF MERCHANTABILITY OR FIT-
     NESS FOR A	PARTICULAR PURPOSE.

FreeBSD	13.0		       January 26, 2010			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | RETURN VALUES | SEE ALSO | STANDARDS | HISTORY | AUTHORS | COPYRIGHT

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