61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* 3cbc_enc.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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/*-
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* $Id: 3cbc_enc.c,v 1.1.1.1 1994/09/30 14:49:50 csgr Exp $
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*/
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#include "des_locl.h"
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void
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xp(a)
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unsigned char *a;
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{ int i; for(i=0; i<8; i++) printf("%02X",a[i]);printf("\n");}
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int des_3cbc_encrypt(input,output,length,ks1,ks2,iv1,iv2,encrypt)
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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 ks1,ks2;
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des_cblock *iv1,*iv2;
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int encrypt;
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{
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int off=length/8-1;
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des_cblock niv1,niv2;
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printf("3cbc\n");
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xp(iv1);
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xp(iv1);
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xp(iv2);
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xp(input);
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if (encrypt == DES_ENCRYPT)
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{
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des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
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if (length >= sizeof(des_cblock))
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bcopy(output[off],niv1,sizeof(des_cblock));
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des_cbc_encrypt(output,output,length,ks2,iv1,!encrypt);
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des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
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if (length >= sizeof(des_cblock))
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bcopy(output[off],niv2,sizeof(des_cblock));
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bcopy(niv1,*iv1,sizeof(des_cblock));
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}
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else
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{
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if (length >= sizeof(des_cblock))
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bcopy(input[off],niv1,sizeof(des_cblock));
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des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
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des_cbc_encrypt(output,output,length,ks2,iv2,!encrypt);
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if (length >= sizeof(des_cblock))
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bcopy(output[off],niv2,sizeof(des_cblock));
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des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
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}
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bcopy(niv1,iv1,sizeof(des_cblock));
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bcopy(niv2,iv2,sizeof(des_cblock));
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xp(iv1);
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xp(iv1);
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xp(iv2);
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xp(output);
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return(0);
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}
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