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/*
* 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 u8[] to u32 in a portable way
* s_vPutUINT32 - Convert from u32 to u8[] 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 u32 s_dwGetUINT32(u8 * p); Get u32 from
* 4 bytes LSByte first
* static void s_vPutUINT32(u8* p, u32 val); Put u32 into
* 4 bytes LSByte first
*/
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(u8 b); /* Add a single byte to the internal
* message */
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 */
/*
static u32 s_dwGetUINT32 (u8 * p)
// Convert from u8[] to u32 in a portable way
{
u32 res = 0;
unsigned int i;
for (i = 0; i < 4; i++)
res |= (*p++) << (8*i);
return res;
}
static void s_vPutUINT32(u8 *p, u32 val)
// Convert from u32 to u8[] in a portable way
{
unsigned int i;
for (i = 0; i < 4; i++) {
*p++ = (u8) (val & 0xff);
val >>= 8;
}
}
*/
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(u8 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(u8 * 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();
}
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