tty/serial: atmel_serial: whitespace and braces modifications
[zen-stable.git] / drivers / staging / vt6655 / michael.c
blob67618f069d0d96425c65faa835e7d20a8d88f010
1 /*
2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
3 * All rights reserved.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 * File: michael.cpp
22 * Purpose: The implementation of LIST data structure.
24 * Author: Kyle Hsu
26 * Date: Sep 4, 2002
28 * Functions:
29 * s_dwGetUINT32 - Convert from unsigned char [] to unsigned long in a portable way
30 * s_vPutUINT32 - Convert from unsigned long to unsigned char [] in a portable way
31 * s_vClear - Reset the state to the empty message.
32 * s_vSetKey - Set the key.
33 * MIC_vInit - Set the key.
34 * s_vAppendByte - Append the byte to our word-sized buffer.
35 * MIC_vAppend - call s_vAppendByte.
36 * MIC_vGetMIC - Append the minimum padding and call s_vAppendByte.
38 * Revision History:
42 #include "tmacro.h"
43 #include "michael.h"
45 /*--------------------- Static Definitions -------------------------*/
47 /*--------------------- Static Variables --------------------------*/
49 /*--------------------- Static Functions --------------------------*/
51 static unsigned long s_dwGetUINT32(unsigned char *p); // Get unsigned long from 4 bytes LSByte first
52 static void s_vPutUINT32(unsigned char *p, unsigned long val); // Put unsigned long into 4 bytes LSByte first
54 static void s_vClear(void); // Clear the internal message,
55 // resets the object to the state just after construction.
56 static void s_vSetKey(unsigned long dwK0, unsigned long dwK1);
57 static void s_vAppendByte(unsigned char b); // Add a single byte to the internal message
59 /*--------------------- Export Variables --------------------------*/
60 static unsigned long L, R; // Current state
62 static unsigned long K0, K1; // Key
63 static unsigned long M; // Message accumulator (single word)
64 static unsigned int nBytesInM; // # bytes in M
66 /*--------------------- Export Functions --------------------------*/
69 static unsigned long s_dwGetUINT32 (unsigned char *p)
70 // Convert from unsigned char [] to unsigned long in a portable way
72 unsigned long res = 0;
73 unsigned int i;
74 for(i=0; i<4; i++ )
76 res |= (*p++) << (8*i);
78 return res;
81 static void s_vPutUINT32 (unsigned char *p, unsigned long val)
82 // Convert from unsigned long to unsigned char [] in a portable way
84 unsigned int i;
85 for(i=0; i<4; i++ )
87 *p++ = (unsigned char) (val & 0xff);
88 val >>= 8;
93 static void s_vClear (void)
95 // Reset the state to the empty message.
96 L = K0;
97 R = K1;
98 nBytesInM = 0;
99 M = 0;
102 static void s_vSetKey (unsigned long dwK0, unsigned long dwK1)
104 // Set the key
105 K0 = dwK0;
106 K1 = dwK1;
107 // and reset the message
108 s_vClear();
111 static void s_vAppendByte (unsigned char b)
113 // Append the byte to our word-sized buffer
114 M |= b << (8*nBytesInM);
115 nBytesInM++;
116 // Process the word if it is full.
117 if( nBytesInM >= 4 )
119 L ^= M;
120 R ^= ROL32( L, 17 );
121 L += R;
122 R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);
123 L += R;
124 R ^= ROL32( L, 3 );
125 L += R;
126 R ^= ROR32( L, 2 );
127 L += R;
128 // Clear the buffer
129 M = 0;
130 nBytesInM = 0;
134 void MIC_vInit (unsigned long dwK0, unsigned long dwK1)
136 // Set the key
137 s_vSetKey(dwK0, dwK1);
141 void MIC_vUnInit (void)
143 // Wipe the key material
144 K0 = 0;
145 K1 = 0;
147 // And the other fields as well.
148 //Note that this sets (L,R) to (K0,K1) which is just fine.
149 s_vClear();
152 void MIC_vAppend (unsigned char *src, unsigned int nBytes)
154 // This is simple
155 while (nBytes > 0)
157 s_vAppendByte(*src++);
158 nBytes--;
162 void MIC_vGetMIC (unsigned long *pdwL, unsigned long *pdwR)
164 // Append the minimum padding
165 s_vAppendByte(0x5a);
166 s_vAppendByte(0);
167 s_vAppendByte(0);
168 s_vAppendByte(0);
169 s_vAppendByte(0);
170 // and then zeroes until the length is a multiple of 4
171 while( nBytesInM != 0 )
173 s_vAppendByte(0);
175 // The s_vAppendByte function has already computed the result.
176 *pdwL = L;
177 *pdwR = R;
178 // Reset to the empty message.
179 s_vClear();