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git-svn-id: file:///Users/lillianskinner/Downloads/platinum/twl/TwlIPL/trunk@40 b08762b0-b915-fc4b-9d8c-17b2551a87ff
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yutaka 2007-10-04 09:34:34 +00:00
parent e9fa033272
commit 73bb413426
1 changed files with 46 additions and 0 deletions
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build/libraries/aes/ARM7/aes_util.c Normal file
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/*---------------------------------------------------------------------------*
Project: TwlIPL - libraries - aes
File: aes_util.c
Copyright 2007 Nintendo. All rights reserved.
These coded instructions, statements, and computer programs contain
proprietary information of Nintendo of America Inc. and/or Nintendo
Company Ltd., and are protected by Federal copyright law. They may
not be disclosed to third parties or copied or duplicated in any form,
in whole or in part, without the prior written consent of Nintendo.
$Date:: $
$Rev$
$Author$
*---------------------------------------------------------------------------*/
#include <firm/aes.h>
/*---------------------------------------------------------------------------*
Name: AESi_AddCounter
Description: calculate updated counter
Arguments: pCounter pointer to the counter at offset 0
nums offset in blocks (AES_BLOCK_SIZE)
Returns: None
*---------------------------------------------------------------------------*/
void AESi_AddCounter(AESCounter* pCounter, u32 nums)
{
u32 data = 0;
int i;
for (i = 0; i < 16; i++)
{
data += pCounter->bytes[i] + (nums & 0xFF);
pCounter->bytes[i] = (u8)(data & 0xFF);
data >>= 8;
nums >>= 8;
if ( !data && !nums )
{
break;
}
}
}