/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*
* File: michael.cpp
*
* Purpose: The implementation of LIST data structure.
*
* Author: Kyle Hsu
*
* Date: Sep 4, 2002
*
* Functions:
* s_dwGetUINT32 - Convert from unsigned char [] to unsigned long in a portable way
* s_vPutUINT32 - Convert from unsigned long to unsigned char [] in a portable way
* s_vClear - Reset the state to the empty message.
* s_vSetKey - Set the key.
* MIC_vInit - Set the key.
* s_vAppendByte - Append the byte to our word-sized buffer.
* MIC_vAppend - call s_vAppendByte.
* MIC_vGetMIC - Append the minimum padding and call s_vAppendByte.
*
* Revision History:
*
*/
#include "tmacro.h"
#include "michael.h"
/*--------------------- Static Definitions -------------------------*/
/*--------------------- Static Variables --------------------------*/
/*--------------------- Static Functions --------------------------*/
static void s_vClear(void); // Clear the internal message,
// resets the object to the state just after construction.
static void s_vSetKey(u32 dwK0, u32 dwK1);
static void s_vAppendByte(unsigned char b); // Add a single byte to the internal message
/*--------------------- Export Variables --------------------------*/
static u32 L, R; /* Current state */
static u32 K0, K1; /* Key */
static u32 M; /* Message accumulator (single word) */
static unsigned int nBytesInM; // # bytes in M
/*--------------------- Export Functions --------------------------*/
static void s_vClear(void)
{
// Reset the state to the empty message.
L = K0;
R = K1;
nBytesInM = 0;
M = 0;
}
static void s_vSetKey(u32 dwK0, u32 dwK1)
{
// Set the key
K0 = dwK0;
K1 = dwK1;
// and reset the message
s_vClear();
}
static void s_vAppendByte(unsigned char b)
{
// Append the byte to our word-sized buffer
M |= b << (8*nBytesInM);
nBytesInM++;
// Process the word if it is full.
if (nBytesInM >= 4) {
L ^= M;
R ^= ROL32(L, 17);
L += R;
R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);
L += R;
R ^= ROL32(L, 3);
L += R;
R ^= ROR32(L, 2);
L += R;
// Clear the buffer
M = 0;
nBytesInM = 0;
}
}
void MIC_vInit(u32 dwK0, u32 dwK1)
{
// Set the key
s_vSetKey(dwK0, dwK1);
}
void MIC_vUnInit(void)
{
// Wipe the key material
K0 = 0;
K1 = 0;
// And the other fields as well.
//Note that this sets (L,R) to (K0,K1) which is just fine.
s_vClear();
}
void MIC_vAppend(unsigned char *src, unsigned int nBytes)
{
// This is simple
while (nBytes > 0) {
s_vAppendByte(*src++);
nBytes--;
}
}
void MIC_vGetMIC(u32 *pdwL, u32 *pdwR)
{
// Append the minimum padding
s_vAppendByte(0x5a);
s_vAppendByte(0);
s_vAppendByte(0);
s_vAppendByte(0);
s_vAppendByte(0);
// and then zeroes until the length is a multiple of 4
while (nBytesInM != 0)
s_vAppendByte(0);
// The s_vAppendByte function has already computed the result.
*pdwL = L;
*pdwR = R;
// Reset to the empty message.
s_vClear();
}
