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62867571 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
58964a49 | 3 | * |
62867571 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
58964a49 RE |
8 | */ |
9 | ||
ec577822 | 10 | #include <openssl/rc4.h> |
58964a49 | 11 | #include "rc4_locl.h" |
ec577822 | 12 | #include <openssl/opensslv.h> |
58964a49 | 13 | |
6b691a5c | 14 | const char *RC4_options(void) |
0f113f3e | 15 | { |
0f113f3e | 16 | if (sizeof(RC4_INT) == 1) |
3e9e810f | 17 | return ("rc4(char)"); |
0f113f3e | 18 | else |
3e9e810f | 19 | return ("rc4(int)"); |
0f113f3e | 20 | } |
58964a49 | 21 | |
c80fd6b2 MC |
22 | /*- |
23 | * RC4 as implemented from a posting from | |
58964a49 | 24 | * Newsgroups: sci.crypt |
58964a49 RE |
25 | * Subject: RC4 Algorithm revealed. |
26 | * Message-ID: <sternCvKL4B.Hyy@netcom.com> | |
27 | * Date: Wed, 14 Sep 1994 06:35:31 GMT | |
28 | */ | |
29 | ||
c236e66d | 30 | void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) |
0f113f3e MC |
31 | { |
32 | register RC4_INT tmp; | |
33 | register int id1, id2; | |
34 | register RC4_INT *d; | |
35 | unsigned int i; | |
36 | ||
37 | d = &(key->data[0]); | |
38 | key->x = 0; | |
39 | key->y = 0; | |
40 | id1 = id2 = 0; | |
58964a49 | 41 | |
376729e1 | 42 | #define SK_LOOP(d,n) { \ |
0f113f3e MC |
43 | tmp=d[(n)]; \ |
44 | id2 = (data[id1] + tmp + id2) & 0xff; \ | |
45 | if (++id1 == len) id1=0; \ | |
46 | d[(n)]=d[id2]; \ | |
47 | d[id2]=tmp; } | |
58964a49 | 48 | |
0f113f3e MC |
49 | for (i = 0; i < 256; i++) |
50 | d[i] = i; | |
51 | for (i = 0; i < 256; i += 4) { | |
52 | SK_LOOP(d, i + 0); | |
53 | SK_LOOP(d, i + 1); | |
54 | SK_LOOP(d, i + 2); | |
55 | SK_LOOP(d, i + 3); | |
56 | } | |
57 | } |