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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/staging/vt6656/rc4.c | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/staging/vt6656/rc4.c')
-rw-r--r-- | drivers/staging/vt6656/rc4.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/rc4.c b/drivers/staging/vt6656/rc4.c new file mode 100644 index 0000000..e6c6131 --- /dev/null +++ b/drivers/staging/vt6656/rc4.c @@ -0,0 +1,87 @@ +/* + * 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: rc4.c + * + * Purpose: + * + * Functions: + * + * Revision History: + * + * Author: Kyle Hsu + * + * Date: Sep 4, 2002 + * + */ + +#include "rc4.h" + +VOID rc4_init(PRC4Ext pRC4, PBYTE pbyKey, UINT cbKey_len) +{ + UINT ust1, ust2; + UINT keyindex; + UINT stateindex; + PBYTE pbyst; + UINT idx; + + pbyst = pRC4->abystate; + pRC4->ux = 0; + pRC4->uy = 0; + for (idx = 0; idx < 256; idx++) + pbyst[idx] = (BYTE)idx; + keyindex = 0; + stateindex = 0; + for (idx = 0; idx < 256; idx++) { + ust1 = pbyst[idx]; + stateindex = (stateindex + pbyKey[keyindex] + ust1) & 0xff; + ust2 = pbyst[stateindex]; + pbyst[stateindex] = (BYTE)ust1; + pbyst[idx] = (BYTE)ust2; + if (++keyindex >= cbKey_len) + keyindex = 0; + } +} + +UINT rc4_byte(PRC4Ext pRC4) +{ + UINT ux; + UINT uy; + UINT ustx, usty; + PBYTE pbyst; + + pbyst = pRC4->abystate; + ux = (pRC4->ux + 1) & 0xff; + ustx = pbyst[ux]; + uy = (ustx + pRC4->uy) & 0xff; + usty = pbyst[uy]; + pRC4->ux = ux; + pRC4->uy = uy; + pbyst[uy] = (BYTE)ustx; + pbyst[ux] = (BYTE)usty; + + return pbyst[(ustx + usty) & 0xff]; +} + +VOID rc4_encrypt(PRC4Ext pRC4, PBYTE pbyDest, + PBYTE pbySrc, UINT cbData_len) +{ + UINT ii; + for (ii = 0; ii < cbData_len; ii++) + pbyDest[ii] = (BYTE)(pbySrc[ii] ^ rc4_byte(pRC4)); +} |