/* $FreeBSD: src/sys/crypto/blowfish/bf_enc.c,v 1.1.2.3 2002/03/26 10:12:23 ume Exp $ */ /* $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun 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/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, BF_KEY *key) { BF_LONG l, r, *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, BF_KEY *key) { BF_LONG l, r, *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; }