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Diffstat (limited to 'crypto/rc4/rc4_skey.c')
| -rw-r--r-- | crypto/rc4/rc4_skey.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/crypto/rc4/rc4_skey.c b/crypto/rc4/rc4_skey.c new file mode 100644 index 0000000000..0be5fde67b --- /dev/null +++ b/crypto/rc4/rc4_skey.c @@ -0,0 +1,119 @@ +/* crypto/rc4/rc4_skey.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * 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 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include "rc4.h" +#include "rc4_locl.h" + +char *RC4_version="RC4 part of SSLeay 0.9.0b 29-Jun-1998"; + +char *RC4_options() + { +#ifdef RC4_INDEX + if (sizeof(RC4_INT) == 1) + return("rc4(idx,char)"); + else + return("rc4(idx,int)"); +#else + if (sizeof(RC4_INT) == 1) + return("rc4(ptr,char)"); + else + return("rc4(ptr,int)"); +#endif + } + +/* RC4 as implemented from a posting from + * Newsgroups: sci.crypt + * From: sterndark@netcom.com (David Sterndark) + * Subject: RC4 Algorithm revealed. + * Message-ID: <sternCvKL4B.Hyy@netcom.com> + * Date: Wed, 14 Sep 1994 06:35:31 GMT + */ + +void RC4_set_key(key, len, data) +RC4_KEY *key; +int len; +register unsigned char *data; + { + register RC4_INT tmp; + register int id1,id2; + register RC4_INT *d; + unsigned int i; + + d= &(key->data[0]); + for (i=0; i<256; i++) + d[i]=i; + key->x = 0; + key->y = 0; + id1=id2=0; + +#define SK_LOOP(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+=4) + { + SK_LOOP(i+0); + SK_LOOP(i+1); + SK_LOOP(i+2); + SK_LOOP(i+3); + } + } + |