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Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain.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>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright (C) 2009 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 <string.h>
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#include <assert.h>
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#include <ipxe/crypto.h>
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#include <ipxe/cbc.h>
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/** @file
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*
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* Cipher-block chaining
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*
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*/
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/**
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* XOR data blocks
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*
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* @v src Input data
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* @v dst Second input data and output data buffer
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* @v len Length of data
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*/
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static void cbc_xor ( const void *src, void *dst, size_t len ) {
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const uint32_t *srcl = src;
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uint32_t *dstl = dst;
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unsigned int i;
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/* Assume that block sizes will always be dword-aligned, for speed */
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assert ( ( len % sizeof ( *srcl ) ) == 0 );
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for ( i = 0 ; i < ( len / sizeof ( *srcl ) ) ; i++ )
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dstl[i] ^= srcl[i];
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}
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/**
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* Encrypt data
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*
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* @v ctx Context
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* @v src Data to encrypt
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* @v dst Buffer for encrypted data
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* @v len Length of data
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* @v raw_cipher Underlying cipher algorithm
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* @v cbc_ctx CBC context
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*/
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void cbc_encrypt ( void *ctx, const void *src, void *dst, size_t len,
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struct cipher_algorithm *raw_cipher, void *cbc_ctx ) {
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size_t blocksize = raw_cipher->blocksize;
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assert ( ( len % blocksize ) == 0 );
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while ( len ) {
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cbc_xor ( src, cbc_ctx, blocksize );
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cipher_encrypt ( raw_cipher, ctx, cbc_ctx, dst, blocksize );
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memcpy ( cbc_ctx, dst, blocksize );
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dst += blocksize;
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src += blocksize;
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len -= blocksize;
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}
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}
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/**
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* Decrypt data
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*
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* @v ctx Context
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* @v src Data to decrypt
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* @v dst Buffer for decrypted data
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* @v len Length of data
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* @v raw_cipher Underlying cipher algorithm
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* @v cbc_ctx CBC context
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*/
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void cbc_decrypt ( void *ctx, const void *src, void *dst, size_t len,
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struct cipher_algorithm *raw_cipher, void *cbc_ctx ) {
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size_t blocksize = raw_cipher->blocksize;
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assert ( ( len % blocksize ) == 0 );
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while ( len ) {
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cipher_decrypt ( raw_cipher, ctx, src, dst, blocksize );
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cbc_xor ( cbc_ctx, dst, blocksize );
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memcpy ( cbc_ctx, src, blocksize );
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dst += blocksize;
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src += blocksize;
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len -= blocksize;
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}
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}
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