NetBSD/sys/crypto/blowfish/bf_enc.c

159 lines
5.3 KiB
C

/* $NetBSD: bf_enc.c,v 1.10 2005/12/11 12:20:48 christos Exp $ */
/* crypto/bf/bf_enc.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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bf_enc.c,v 1.10 2005/12/11 12:20:48 christos Exp $");
#include <sys/types.h>
#include <crypto/blowfish/blowfish.h>
#include <crypto/blowfish/bf_locl.h>
/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
* (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
* CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
*/
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
If you set BF_ROUNDS to some value other than 16 or 20, you will have
to modify the code.
#endif
/* XXX "data" is host endian */
void
BF_encrypt(BF_LONG *data, const BF_KEY *key)
{
BF_LONG l, r;
const BF_LONG *p, *s;
p = key->P;
s= &key->S[0];
l = data[0];
r = data[1];
l^=p[0];
BF_ENC(r, l, s, p[ 1]);
BF_ENC(l, r, s, p[ 2]);
BF_ENC(r, l, s, p[ 3]);
BF_ENC(l, r, s, p[ 4]);
BF_ENC(r, l, s, p[ 5]);
BF_ENC(l, r, s, p[ 6]);
BF_ENC(r, l, s, p[ 7]);
BF_ENC(l, r, s, p[ 8]);
BF_ENC(r, l, s, p[ 9]);
BF_ENC(l, r, s, p[10]);
BF_ENC(r, l, s, p[11]);
BF_ENC(l, r, s, p[12]);
BF_ENC(r, l, s, p[13]);
BF_ENC(l, r, s, p[14]);
BF_ENC(r, l, s, p[15]);
BF_ENC(l, r, s, p[16]);
#if BF_ROUNDS == 20
BF_ENC(r, l, s, p[17]);
BF_ENC(l, r, s, p[18]);
BF_ENC(r, l, s, p[19]);
BF_ENC(l, r, s, p[20]);
#endif
r ^= p[BF_ROUNDS + 1];
data[1] = l & 0xffffffff;
data[0] = r & 0xffffffff;
}
/* XXX "data" is host endian */
void
BF_decrypt(BF_LONG *data, const BF_KEY *key)
{
BF_LONG l, r;
const BF_LONG *p, *s;
p = key->P;
s= &key->S[0];
l = data[0];
r = data[1];
l ^= p[BF_ROUNDS + 1];
#if BF_ROUNDS == 20
BF_ENC(r, l, s, p[20]);
BF_ENC(l, r, s, p[19]);
BF_ENC(r, l, s, p[18]);
BF_ENC(l, r, s, p[17]);
#endif
BF_ENC(r, l, s, p[16]);
BF_ENC(l, r, s, p[15]);
BF_ENC(r, l, s, p[14]);
BF_ENC(l, r, s, p[13]);
BF_ENC(r, l, s, p[12]);
BF_ENC(l, r, s, p[11]);
BF_ENC(r, l, s, p[10]);
BF_ENC(l, r, s, p[ 9]);
BF_ENC(r, l, s, p[ 8]);
BF_ENC(l, r, s, p[ 7]);
BF_ENC(r, l, s, p[ 6]);
BF_ENC(l, r, s, p[ 5]);
BF_ENC(r, l, s, p[ 4]);
BF_ENC(l, r, s, p[ 3]);
BF_ENC(r, l, s, p[ 2]);
BF_ENC(l, r, s, p[ 1]);
r ^= p[0];
data[1] = l & 0xffffffff;
data[0] = r & 0xffffffff;
}