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Diffstat (limited to 'rc4.c')
| -rw-r--r-- | rc4.c | 109 |
1 files changed, 0 insertions, 109 deletions
@@ -1,109 +0,0 @@ -/*! \file rc4.c - \brief Source file for RC4 stream cipher routines - \author Damien Miller <djm@mindrot.org> - \version 0.0.0 - \date 1999 - - A simple implementation of the RC4 stream cipher, based on the - description given in _Bruce Schneier's_ "Applied Cryptography" - 2nd edition. - - Copyright 1999 Damien Miller - - Permission is hereby granted, free of charge, to any person - obtaining a copy of this software and associated documentation - files (the "Software"), to deal in the Software without - restriction, including without limitation the rights to use, copy, - modify, merge, publish, distribute, sublicense, and/or sell copies - of the Software, and to permit persons to whom the Software is - furnished to do so, subject to the following conditions: - - The above copyright notice and this permission notice shall be - included in all copies or substantial portions of the Software. - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY - KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE - WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE - AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER BE LIABLE - FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF - CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION - WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - - \warning None of these functions clears its memory after use. It - \warning is the responsability of the calling routines to ensure - \warning that any sensitive data (keystream, key or plaintext) is - \warning properly erased after use. - - \warning The name "RC4" is trademarked in the United States, - \warning you may need to use "RC4 compatible" or "ARC4" - \warning (Alleged RC4). -*/ - -/* $Id: rc4.c,v 1.1.1.1 1999/10/26 05:48:13 damien Exp $ */ - -#include "config.h" - -#ifndef HAVE_ARC4RANDOM -#include "rc4.h" - - -void rc4_key(rc4_t *r, unsigned char *key, int len) -{ - int t; - - for(r->i = 0; r->i < 256; r->i++) - r->s[r->i] = r->i; - - r->j = 0; - for(r->i = 0; r->i < 256; r->i++) - { - r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256; - t = r->s[r->i]; - r->s[r->i] = r->s[r->j]; - r->s[r->j] = t; - } - r->i = r->j = 0; -} - -void rc4_crypt(rc4_t *r, unsigned char *plaintext, int len) -{ - int t; - int c; - - c = 0; - while(c < len) - { - r->i = (r->i + 1) % 256; - r->j = (r->j + r->s[r->i]) % 256; - t = r->s[r->i]; - r->s[r->i] = r->s[r->j]; - r->s[r->j] = t; - - t = (r->s[r->i] + r->s[r->j]) % 256; - - plaintext[c] ^= r->s[t]; - c++; - } -} - -void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len) -{ - int t; - int c; - - c = 0; - while(c < len) - { - r->i = (r->i + 1) % 256; - r->j = (r->j + r->s[r->i]) % 256; - t = r->s[r->i]; - r->s[r->i] = r->s[r->j]; - r->s[r->j] = t; - - t = (r->s[r->i] + r->s[r->j]) % 256; - - buffer[c] = r->s[t]; - c++; - } -} -#endif /* !HAVE_ARC4RANDOM */ |