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Diffstat (limited to 'drivers/staging/vt6656/michael.c')
| -rw-r--r-- | drivers/staging/vt6656/michael.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/michael.c b/drivers/staging/vt6656/michael.c new file mode 100644 index 000000000000..c930e0cdb853 --- /dev/null +++ b/drivers/staging/vt6656/michael.c @@ -0,0 +1,181 @@ +/* + * 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 BYTE[] to DWORD in a portable way + * s_vPutUINT32 - Convert from DWORD to BYTE[] 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 DWORD s_dwGetUINT32(BYTE * p); // Get DWORD from 4 bytes LSByte first +static VOID s_vPutUINT32(BYTE* p, DWORD val); // Put DWORD 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(DWORD dwK0, DWORD dwK1); +static VOID s_vAppendByte(BYTE b); // Add a single byte to the internal message + +/*--------------------- Export Variables --------------------------*/ +static DWORD L, R; // Current state + +static DWORD K0, K1; // Key +static DWORD M; // Message accumulator (single word) +static UINT nBytesInM; // # bytes in M + +/*--------------------- Export Functions --------------------------*/ + +/* +static DWORD s_dwGetUINT32 (BYTE * p) +// Convert from BYTE[] to DWORD in a portable way +{ + DWORD res = 0; + UINT i; + for(i=0; i<4; i++ ) + { + res |= (*p++) << (8*i); + } + return res; +} + +static VOID s_vPutUINT32 (BYTE* p, DWORD val) +// Convert from DWORD to BYTE[] in a portable way +{ + UINT i; + for(i=0; i<4; i++ ) + { + *p++ = (BYTE) (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 (DWORD dwK0, DWORD dwK1) +{ + // Set the key + K0 = dwK0; + K1 = dwK1; + // and reset the message + s_vClear(); +} + +static VOID s_vAppendByte (BYTE 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 (DWORD dwK0, DWORD 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 (PBYTE src, UINT nBytes) +{ + // This is simple + while (nBytes > 0) + { + s_vAppendByte(*src++); + nBytes--; + } +} + +VOID MIC_vGetMIC (PDWORD pdwL, PDWORD 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(); +} + |