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/* $OpenBSD: cfb64enc.c,v 1.6 2014/10/28 07:35:58 jsg Exp $ */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include "des_locl.h" |
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/* The input and output encrypted as though 64bit cfb mode is being |
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* used. The extra state information to record how much of the |
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* 64bit block we have used is contained in *num; |
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*/ |
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void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
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long length, DES_key_schedule *schedule, |
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DES_cblock *ivec, int *num, int enc) |
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{ |
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DES_LONG v0,v1; |
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long l=length; |
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int n= *num; |
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DES_LONG ti[2]; |
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unsigned char *iv,c,cc; |
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iv = &(*ivec)[0]; |
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✓✓ |
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if (enc) |
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{ |
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✓✓ |
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while (l--) |
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{ |
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✓✓ |
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if (n == 0) |
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{ |
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c2l(iv,v0); ti[0]=v0; |
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c2l(iv,v1); ti[1]=v1; |
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DES_encrypt1(ti,schedule,DES_ENCRYPT); |
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iv = &(*ivec)[0]; |
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v0=ti[0]; l2c(v0,iv); |
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v0=ti[1]; l2c(v0,iv); |
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iv = &(*ivec)[0]; |
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} |
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c= *(in++)^iv[n]; |
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*(out++)=c; |
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iv[n]=c; |
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n=(n+1)&0x07; |
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} |
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} |
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else |
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{ |
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✓✓ |
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while (l--) |
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{ |
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✓✓ |
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if (n == 0) |
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{ |
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c2l(iv,v0); ti[0]=v0; |
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c2l(iv,v1); ti[1]=v1; |
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DES_encrypt1(ti,schedule,DES_ENCRYPT); |
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iv = &(*ivec)[0]; |
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v0=ti[0]; l2c(v0,iv); |
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v0=ti[1]; l2c(v0,iv); |
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iv = &(*ivec)[0]; |
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} |
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cc= *(in++); |
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c=iv[n]; |
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iv[n]=cc; |
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*(out++)=c^cc; |
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n=(n+1)&0x07; |
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} |
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} |
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v0=v1=ti[0]=ti[1]=c=cc=0; |
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*num=n; |
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} |
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