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git.ipfire.org Git - thirdparty/u-boot.git/blob - lib/rc4.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2015 Google, Inc
5 * (C) Copyright 2008-2014 Rockchip Electronics
7 * Rivest Cipher 4 (RC4) implementation
15 void rc4_encode(unsigned char *buf
, unsigned int len
, unsigned char key
[16])
17 unsigned char s
[256], k
[256], temp
;
18 unsigned short i
, j
, t
;
22 for (i
= 0; i
< 256; i
++) {
23 s
[i
] = (unsigned char)i
;
30 for (i
= 0; i
< 256; i
++) {
31 j
= (j
+ s
[i
] + k
[i
]) % 256;
39 for (ptr
= 0; ptr
< len
; ptr
++) {
45 t
= (s
[i
] + (s
[j
] % 256)) % 256;
46 buf
[ptr
] = buf
[ptr
] ^ s
[t
];