56 lines
1.0 KiB
C
56 lines
1.0 KiB
C
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/* cbc_cksm.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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/*-
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* $Id: cbc_cksm.c,v 1.2 1994/07/19 19:21:45 g89r4222 Exp $
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*/
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#include "des_locl.h"
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unsigned long des_cbc_cksum(input,output,length,schedule,ivec)
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des_cblock *input;
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des_cblock *output;
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long length;
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des_key_schedule schedule;
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des_cblock *ivec;
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{
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register unsigned long tout0,tout1,tin0,tin1;
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register long l=length;
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unsigned long tin[2],tout[2];
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unsigned char *in,*out,*iv;
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in=(unsigned char *)input;
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out=(unsigned char *)output;
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iv=(unsigned char *)ivec;
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c2l(iv,tout0);
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c2l(iv,tout1);
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for (; l>0; l-=8)
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{
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if (l >= 8)
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{
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c2l(in,tin0);
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c2l(in,tin1);
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}
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else
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c2ln(in,tin0,tin1,l);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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des_encrypt((unsigned long *)tin,(unsigned long *)tout,
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schedule,DES_ENCRYPT);
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/* fix 15/10/91 eay - thanks to keithr@sco.COM */
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tout0=tout[0];
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tout1=tout[1];
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}
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if (out != NULL)
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{
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l2c(tout0,out);
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l2c(tout1,out);
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}
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tout0=tin0=tin1=tin[0]=tin[1]=tout[0]=tout[1]=0;
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return(tout1);
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}
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