/* crypto/bf/bf_cbc.c */ /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@mincom.oz.au). * 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@mincom.oz.au). * * 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@mincom.oz.au)" * 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@mincom.oz.au)" * * 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 "blowfish.h" #include "bf_locl.h" void BF_cbc_encrypt(in, out, length, ks, iv, encrypt) unsigned char *in; unsigned char *out; long length; BF_KEY *ks; unsigned char *iv; int encrypt; { register BF_LONG tin0,tin1; register BF_LONG tout0,tout1,xor0,xor1; register long l=length; BF_LONG tin[2]; if (encrypt) { n2l(iv,tout0); n2l(iv,tout1); iv-=8; for (l-=8; l>=0; l-=8) { n2l(in,tin0); n2l(in,tin1); tin0^=tout0; tin1^=tout1; tin[0]=tin0; tin[1]=tin1; BF_encrypt(tin,ks,BF_ENCRYPT); tout0=tin[0]; tout1=tin[1]; l2n(tout0,out); l2n(tout1,out); } if (l != -8) { n2ln(in,tin0,tin1,l+8); tin0^=tout0; tin1^=tout1; tin[0]=tin0; tin[1]=tin1; BF_encrypt(tin,ks,BF_ENCRYPT); tout0=tin[0]; tout1=tin[1]; l2n(tout0,out); l2n(tout1,out); } l2n(tout0,iv); l2n(tout1,iv); } else { n2l(iv,xor0); n2l(iv,xor1); iv-=8; for (l-=8; l>=0; l-=8) { n2l(in,tin0); n2l(in,tin1); tin[0]=tin0; tin[1]=tin1; BF_encrypt(tin,ks,BF_DECRYPT); tout0=tin[0]^xor0; tout1=tin[1]^xor1; l2n(tout0,out); l2n(tout1,out); xor0=tin0; xor1=tin1; } if (l != -8) { n2l(in,tin0); n2l(in,tin1); tin[0]=tin0; tin[1]=tin1; BF_encrypt(tin,ks,BF_DECRYPT); tout0=tin[0]^xor0; tout1=tin[1]^xor1; l2nn(tout0,tout1,out,l+8); xor0=tin0; xor1=tin1; } l2n(xor0,iv); l2n(xor1,iv); } tin0=tin1=tout0=tout1=xor0=xor1=0; tin[0]=tin[1]=0; }