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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
     integrity 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 sequence; 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 sequence; 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 con‐
		   text

SEE ALSO
     gss_wrap(3)

STANDARDS
     RFC 2743	   Generic Security Service Application Program Interface Ver‐
		   sion 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
     assist 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
     revoked 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.

BSD			       January 26, 2010				   BSD
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