3 * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
14 #define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
16 int rc4_skip(const u8 *key, size_t keylen, size_t skip,
17 u8 *data, size_t data_len)
24 for (i = 0; i < 256; i++)
28 for (i = 0; i < 256; i++) {
29 j = (j + S[i] + key[kpos]) & 0xff;
36 /* Skip the start of the stream */
38 for (k = 0; k < skip; k++) {
40 j = (j + S[i]) & 0xff;
44 /* Apply RC4 to data */
46 for (k = 0; k < data_len; k++) {
48 j = (j + S[i]) & 0xff;
50 *pos++ ^= S[(S[i] + S[j]) & 0xff];