diff options
Diffstat (limited to 'drivers/staging/rtl8192u/ieee80211/michael_mic.c')
| -rw-r--r-- | drivers/staging/rtl8192u/ieee80211/michael_mic.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/drivers/staging/rtl8192u/ieee80211/michael_mic.c b/drivers/staging/rtl8192u/ieee80211/michael_mic.c deleted file mode 100644 index df256e487c20..000000000000 --- a/drivers/staging/rtl8192u/ieee80211/michael_mic.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * Cryptographic API - * - * Michael MIC (IEEE 802.11i/TKIP) keyed digest - * - * Copyright (c) 2004 Jouni Malinen <jkmaline@cc.hut.fi> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/string.h> -//#include <linux/crypto.h> -#include "rtl_crypto.h" - - -struct michael_mic_ctx { - u8 pending[4]; - size_t pending_len; - - u32 l, r; -}; - - -static inline u32 rotl(u32 val, int bits) -{ - return (val << bits) | (val >> (32 - bits)); -} - - -static inline u32 rotr(u32 val, int bits) -{ - return (val >> bits) | (val << (32 - bits)); -} - - -static inline u32 xswap(u32 val) -{ - return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8); -} - - -#define michael_block(l, r) \ -do { \ - r ^= rotl(l, 17); \ - l += r; \ - r ^= xswap(l); \ - l += r; \ - r ^= rotl(l, 3); \ - l += r; \ - r ^= rotr(l, 2); \ - l += r; \ -} while (0) - - -static inline u32 get_le32(const u8 *p) -{ - return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); -} - - -static inline void put_le32(u8 *p, u32 v) -{ - p[0] = v; - p[1] = v >> 8; - p[2] = v >> 16; - p[3] = v >> 24; -} - - -static void michael_init(void *ctx) -{ - struct michael_mic_ctx *mctx = ctx; - mctx->pending_len = 0; -} - - -static void michael_update(void *ctx, const u8 *data, unsigned int len) -{ - struct michael_mic_ctx *mctx = ctx; - - if (mctx->pending_len) { - int flen = 4 - mctx->pending_len; - if (flen > len) - flen = len; - memcpy(&mctx->pending[mctx->pending_len], data, flen); - mctx->pending_len += flen; - data += flen; - len -= flen; - - if (mctx->pending_len < 4) - return; - - mctx->l ^= get_le32(mctx->pending); - michael_block(mctx->l, mctx->r); - mctx->pending_len = 0; - } - - while (len >= 4) { - mctx->l ^= get_le32(data); - michael_block(mctx->l, mctx->r); - data += 4; - len -= 4; - } - - if (len > 0) { - mctx->pending_len = len; - memcpy(mctx->pending, data, len); - } -} - - -static void michael_final(void *ctx, u8 *out) -{ - struct michael_mic_ctx *mctx = ctx; - u8 *data = mctx->pending; - - /* Last block and padding (0x5a, 4..7 x 0) */ - switch (mctx->pending_len) { - case 0: - mctx->l ^= 0x5a; - break; - case 1: - mctx->l ^= data[0] | 0x5a00; - break; - case 2: - mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000; - break; - case 3: - mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) | - 0x5a000000; - break; - } - michael_block(mctx->l, mctx->r); - /* l ^= 0; */ - michael_block(mctx->l, mctx->r); - - put_le32(out, mctx->l); - put_le32(out + 4, mctx->r); -} - - -static int michael_setkey(void *ctx, const u8 *key, unsigned int keylen, - u32 *flags) -{ - struct michael_mic_ctx *mctx = ctx; - if (keylen != 8) { - if (flags) - *flags = CRYPTO_TFM_RES_BAD_KEY_LEN; - return -EINVAL; - } - mctx->l = get_le32(key); - mctx->r = get_le32(key + 4); - return 0; -} - - -static struct crypto_alg michael_mic_alg = { - .cra_name = "michael_mic", - .cra_flags = CRYPTO_ALG_TYPE_DIGEST, - .cra_blocksize = 8, - .cra_ctxsize = sizeof(struct michael_mic_ctx), - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(michael_mic_alg.cra_list), - .cra_u = { .digest = { - .dia_digestsize = 8, - .dia_init = michael_init, - .dia_update = michael_update, - .dia_final = michael_final, - .dia_setkey = michael_setkey } } -}; - - -static int __init michael_mic_init(void) -{ - return crypto_register_alg(&michael_mic_alg); -} - - -static void __exit michael_mic_exit(void) -{ - crypto_unregister_alg(&michael_mic_alg); -} - - -module_init(michael_mic_init); -module_exit(michael_mic_exit); - -MODULE_LICENSE("GPL v2"); -MODULE_DESCRIPTION("Michael MIC"); -MODULE_AUTHOR("Jouni Malinen <jkmaline@cc.hut.fi>"); |