b33abb44fd
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@171 ec53bebd-3082-4978-b11e-865c3cabbd6b
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* pcbc_enc.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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#include "des_locl.h"
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int des_pcbc_encrypt(des_cblock (*input), des_cblock (*output), long int length, struct des_ks_struct *schedule, des_cblock (*ivec), int encrypt)
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{
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register u_int32_t sin0,sin1,xor0,xor1,tout0,tout1;
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u_int32_t 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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if (encrypt)
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{
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c2l(iv,xor0);
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c2l(iv,xor1);
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for (; length>0; length-=8)
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{
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if (length >= 8)
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{
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c2l(in,sin0);
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c2l(in,sin1);
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}
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else
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c2ln(in,sin0,sin1,length);
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tin[0]=sin0^xor0;
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tin[1]=sin1^xor1;
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des_encrypt(tin,tout,
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schedule,encrypt);
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tout0=tout[0];
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tout1=tout[1];
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xor0=sin0^tout[0];
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xor1=sin1^tout[1];
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l2c(tout0,out);
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l2c(tout1,out);
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}
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}
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else
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{
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c2l(iv,xor0); c2l(iv,xor1);
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for (; length>0; length-=8)
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{
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c2l(in,sin0);
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c2l(in,sin1);
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tin[0]=sin0;
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tin[1]=sin1;
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des_encrypt(tin,tout,
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schedule,encrypt);
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tout0=tout[0]^xor0;
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tout1=tout[1]^xor1;
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if (length >= 8)
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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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else
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l2cn(tout0,tout1,out,length);
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xor0=tout0^sin0;
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xor1=tout1^sin1;
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}
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}
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tin[0]=tin[1]=tout[0]=tout[1]=0;
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sin0=sin1=xor0=xor1=tout0=tout1=0;
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return(0);
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}
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