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