mirror of
https://github.com/ossrs/srs.git
synced 2025-03-09 15:49:59 +00:00
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
|
|
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include <openssl/rc4.h>
|
|
#include "rc4_locl.h"
|
|
#include <openssl/opensslv.h>
|
|
|
|
const char *RC4_options(void)
|
|
{
|
|
if (sizeof(RC4_INT) == 1)
|
|
return "rc4(char)";
|
|
else
|
|
return "rc4(int)";
|
|
}
|
|
|
|
/*-
|
|
* RC4 as implemented from a posting from
|
|
* Newsgroups: sci.crypt
|
|
* Subject: RC4 Algorithm revealed.
|
|
* Message-ID: <sternCvKL4B.Hyy@netcom.com>
|
|
* Date: Wed, 14 Sep 1994 06:35:31 GMT
|
|
*/
|
|
|
|
void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
|
|
{
|
|
register RC4_INT tmp;
|
|
register int id1, id2;
|
|
register RC4_INT *d;
|
|
unsigned int i;
|
|
|
|
d = &(key->data[0]);
|
|
key->x = 0;
|
|
key->y = 0;
|
|
id1 = id2 = 0;
|
|
|
|
#define SK_LOOP(d,n) { \
|
|
tmp=d[(n)]; \
|
|
id2 = (data[id1] + tmp + id2) & 0xff; \
|
|
if (++id1 == len) id1=0; \
|
|
d[(n)]=d[id2]; \
|
|
d[id2]=tmp; }
|
|
|
|
for (i = 0; i < 256; i++)
|
|
d[i] = i;
|
|
for (i = 0; i < 256; i += 4) {
|
|
SK_LOOP(d, i + 0);
|
|
SK_LOOP(d, i + 1);
|
|
SK_LOOP(d, i + 2);
|
|
SK_LOOP(d, i + 3);
|
|
}
|
|
}
|