From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 19:20:00 +0200 Subject: Adding upstream version 2:4.20.0+dfsg. Signed-off-by: Daniel Baumann --- third_party/heimdal/lib/hcrypto/rc4.c | 79 +++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 third_party/heimdal/lib/hcrypto/rc4.c (limited to 'third_party/heimdal/lib/hcrypto/rc4.c') diff --git a/third_party/heimdal/lib/hcrypto/rc4.c b/third_party/heimdal/lib/hcrypto/rc4.c new file mode 100644 index 0000000..cc7882d --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/rc4.c @@ -0,0 +1,79 @@ +/* + * Copyright (c) 2004 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* implemented from description in draft-kaukonen-cipher-arcfour-03.txt */ + +#include +#include + +#include + +#define SWAP(k,x,y) \ +{ unsigned int _t; \ + _t = k->state[x]; \ + k->state[x] = k->state[y]; \ + k->state[y] = _t; \ +} + +void +RC4_set_key(RC4_KEY *key, const int len, const unsigned char *data) +{ + int i, j; + + for (i = 0; i < 256; i++) + key->state[i] = i; + for (i = 0, j = 0; i < 256; i++) { + j = (j + key->state[i] + data[i % len]) % 256; + SWAP(key, i, j); + } + key->x = key->y = 0; +} + +void +RC4(RC4_KEY *key, const int len, const unsigned char *in, unsigned char *out) +{ + int i, t; + unsigned x, y; + + x = key->x; + y = key->y; + for (i = 0; i < len; i++) { + x = (x + 1) % 256; + y = (y + key->state[x]) % 256; + SWAP(key, x, y); + t = (key->state[x] + key->state[y]) % 256; + *out++ = key->state[t] ^ *in++; + } + key->x = x; + key->y = y; +} -- cgit v1.2.3