diff options
Diffstat (limited to 'contrib/wpa_supplicant/rc4.c')
| -rw-r--r-- | contrib/wpa_supplicant/rc4.c | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/contrib/wpa_supplicant/rc4.c b/contrib/wpa_supplicant/rc4.c index 97ec1b0..4cf14d9 100644 --- a/contrib/wpa_supplicant/rc4.c +++ b/contrib/wpa_supplicant/rc4.c @@ -1,7 +1,6 @@ /* - * Host AP (software wireless LAN access point) user space daemon for - * Host AP kernel driver / RC4 - * Copyright (c) 2002-2004, Jouni Malinen <jkmaline@cc.hut.fi> + * RC4 stream cipher + * Copyright (c) 2002-2005, 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 @@ -19,7 +18,20 @@ #define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0) -void rc4_skip(u8 *key, size_t keylen, size_t skip, u8 *data, size_t data_len) +/** + * rc4 - XOR RC4 stream to given data with skip-stream-start + * @key: RC4 key + * @keylen: RC4 key length + * @skip: number of bytes to skip from the beginning of the RC4 stream + * @data: data to be XOR'ed with RC4 stream + * @data_len: buf length + * + * Generate RC4 pseudo random stream for the given key, skip beginning of the + * stream, and XOR the end result with the data buffer to perform RC4 + * encryption/decryption. + */ +void rc4_skip(const u8 *key, size_t keylen, size_t skip, + u8 *data, size_t data_len) { u32 i, j, k; u8 S[256], *pos; @@ -57,7 +69,17 @@ void rc4_skip(u8 *key, size_t keylen, size_t skip, u8 *data, size_t data_len) } -void rc4(u8 *buf, size_t len, u8 *key, size_t key_len) +/** + * rc4 - XOR RC4 stream to given data + * @buf: data to be XOR'ed with RC4 stream + * @len: buf length + * @key: RC4 key + * @key_len: RC4 key length + * + * Generate RC4 pseudo random stream for the given key and XOR this with the + * data buffer to perform RC4 encryption/decryption. + */ +void rc4(u8 *buf, size_t len, const u8 *key, size_t key_len) { rc4_skip(key, key_len, 0, buf, len); } |
