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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Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain.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>
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*
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* Copyright (C) 2007 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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/**
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* @file
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*
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* Keyed-Hashing for Message Authentication
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*/
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#include <string.h>
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#include <assert.h>
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#include <ipxe/crypto.h>
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#include <ipxe/hmac.h>
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/**
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* Reduce HMAC key length
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*
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* @v digest Digest algorithm to use
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* @v digest_ctx Digest context
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* @v key Key
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* @v key_len Length of key
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*/
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static void hmac_reduce_key ( struct digest_algorithm *digest,
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void *key, size_t *key_len ) {
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uint8_t digest_ctx[digest->ctxsize];
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digest_init ( digest, digest_ctx );
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digest_update ( digest, digest_ctx, key, *key_len );
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digest_final ( digest, digest_ctx, key );
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*key_len = digest->digestsize;
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}
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/**
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* Initialise HMAC
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*
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* @v digest Digest algorithm to use
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* @v digest_ctx Digest context
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* @v key Key
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* @v key_len Length of key
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*
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* The length of the key should be less than the block size of the
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* digest algorithm being used. (If the key length is greater, it
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* will be replaced with its own digest, and key_len will be updated
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* accordingly).
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*/
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void hmac_init ( struct digest_algorithm *digest, void *digest_ctx,
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void *key, size_t *key_len ) {
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unsigned char k_ipad[digest->blocksize];
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unsigned int i;
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/* Reduce key if necessary */
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if ( *key_len > sizeof ( k_ipad ) )
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hmac_reduce_key ( digest, key, key_len );
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/* Construct input pad */
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memset ( k_ipad, 0, sizeof ( k_ipad ) );
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memcpy ( k_ipad, key, *key_len );
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for ( i = 0 ; i < sizeof ( k_ipad ) ; i++ ) {
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k_ipad[i] ^= 0x36;
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}
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/* Start inner hash */
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digest_init ( digest, digest_ctx );
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digest_update ( digest, digest_ctx, k_ipad, sizeof ( k_ipad ) );
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}
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/**
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* Finalise HMAC
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*
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* @v digest Digest algorithm to use
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* @v digest_ctx Digest context
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* @v key Key
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* @v key_len Length of key
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* @v hmac HMAC digest to fill in
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*
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* The length of the key should be less than the block size of the
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* digest algorithm being used. (If the key length is greater, it
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* will be replaced with its own digest, and key_len will be updated
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* accordingly).
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*/
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void hmac_final ( struct digest_algorithm *digest, void *digest_ctx,
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void *key, size_t *key_len, void *hmac ) {
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unsigned char k_opad[digest->blocksize];
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unsigned int i;
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/* Reduce key if necessary */
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if ( *key_len > sizeof ( k_opad ) )
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hmac_reduce_key ( digest, key, key_len );
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/* Construct output pad */
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memset ( k_opad, 0, sizeof ( k_opad ) );
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memcpy ( k_opad, key, *key_len );
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for ( i = 0 ; i < sizeof ( k_opad ) ; i++ ) {
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k_opad[i] ^= 0x5c;
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}
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/* Finish inner hash */
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digest_final ( digest, digest_ctx, hmac );
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/* Perform outer hash */
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digest_init ( digest, digest_ctx );
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digest_update ( digest, digest_ctx, k_opad, sizeof ( k_opad ) );
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digest_update ( digest, digest_ctx, hmac, digest->digestsize );
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digest_final ( digest, digest_ctx, hmac );
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}
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