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GSS_GET_MIC(3)		      Programmer's Manual		GSS_GET_MIC(3)

NAME
     gss_get_mic, gss_sign — Calculate a cryptographic message integrity code
     (MIC) for a message; integrity service

SYNOPSIS
     #include <gssapi/gssapi.h>

     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 msg_token);

     OM_uint32
     gss_sign(OM_uint32 *minor_status, const gss_ctx_id_t context_handle,
	 gss_qop_t qop_req, gss_buffer_t message_buffer,
	 gss_buffer_t msg_token);

DESCRIPTION
     Generates a cryptographic MIC for the supplied message, and places the
     MIC in a token for transfer to the peer application.  The qop_req parame‐
     ter allows a choice between several cryptographic algorithms, if sup‐
     ported by the chosen mechanism.

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

     The gss_sign() routine is an obsolete variant of gss_get_mic().  It is
     provided for backwards compatibility with applications using the GSS-API
     V1 interface.  A distinct entrypoint (as opposed to #define) is provided,
     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 will be sent.

     qop_req	   Specifies requested quality of protection.  Callers are
		   encouraged, on portability grounds, to accept the default
		   quality of protection offered by the chosen mechanism,
		   which may be requested by specifying GSS_C_QOP_DEFAULT for
		   this parameter.  If an unsupported protection strength is
		   requested, gss_get_mic() will return a major_status of
		   GSS_S_BAD_QOP.

     message_buffer
		   Message to be protected.

     msg_token	   Buffer to receive token.  The application must free storage
		   associated with this buffer after use with a call to
		   gss_release_buffer().

RETURN VALUES
     GSS_S_COMPLETE
		   Successful completion

     GSS_S_CONTEXT_EXPIRED
		   The context has already expired

     GSS_S_NO_CONTEXT
		   The context_handle parameter did not identify a valid con‐
		   text

     GSS_S_BAD_QOP
		   The specified QOP is not supported by the mechanism

SEE ALSO
     gss_wrap(3), gss_release_buffer(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_get_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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