8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <ipxe/crypto.h>
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#include <ipxe/chap.h>
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/** @file
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*
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* CHAP protocol
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*
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*/
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/**
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* Initialise CHAP challenge/response
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*
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* @v chap CHAP challenge/response
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* @v digest Digest algorithm to use
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* @ret rc Return status code
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*
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* Initialises a CHAP challenge/response structure. This routine
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* allocates memory, and so may fail. The allocated memory must
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* eventually be freed by a call to chap_finish().
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*/
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int chap_init ( struct chap_response *chap,
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struct digest_algorithm *digest ) {
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size_t state_len;
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void *state;
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assert ( chap->digest == NULL );
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assert ( chap->digest_context == NULL );
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assert ( chap->response == NULL );
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DBG ( "CHAP %p initialising with %s digest\n", chap, digest->name );
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state_len = ( digest->ctxsize + digest->digestsize );
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state = malloc ( state_len );
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if ( ! state ) {
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DBG ( "CHAP %p could not allocate %zd bytes for state\n",
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chap, state_len );
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return -ENOMEM;
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}
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chap->digest = digest;
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chap->digest_context = state;
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chap->response = ( state + digest->ctxsize );
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chap->response_len = digest->digestsize;
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digest_init ( chap->digest, chap->digest_context );
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return 0;
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}
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/**
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* Add data to the CHAP challenge
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*
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* @v chap CHAP response
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* @v data Data to add
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* @v len Length of data to add
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*/
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void chap_update ( struct chap_response *chap, const void *data,
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size_t len ) {
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assert ( chap->digest != NULL );
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assert ( chap->digest_context != NULL );
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if ( ! chap->digest )
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return;
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digest_update ( chap->digest, chap->digest_context, data, len );
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}
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/**
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* Respond to the CHAP challenge
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*
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* @v chap CHAP response
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*
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* Calculates the final CHAP response value, and places it in @c
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* chap->response, with a length of @c chap->response_len.
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*/
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void chap_respond ( struct chap_response *chap ) {
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assert ( chap->digest != NULL );
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assert ( chap->digest_context != NULL );
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assert ( chap->response != NULL );
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DBG ( "CHAP %p responding to challenge\n", chap );
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if ( ! chap->digest )
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return;
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digest_final ( chap->digest, chap->digest_context, chap->response );
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}
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/**
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* Free resources used by a CHAP response
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*
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* @v chap CHAP response
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*/
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void chap_finish ( struct chap_response *chap ) {
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void *state = chap->digest_context;
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DBG ( "CHAP %p finished\n", chap );
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free ( state );
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memset ( chap, 0, sizeof ( *chap ) );
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}
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