3cbc_enc.c

来自「Netscape公司提供的安全套接字层」· C语言 代码 · 共 54 行

/* 3cbc_enc.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
#include "des_locl.h"

int des_3cbc_encrypt(input,output,length,ks1,ks2,iv1,iv2,encrypt)
des_cblock *input;
des_cblock *output;
long length;
des_key_schedule ks1,ks2;
des_cblock *iv1,*iv2;
int encrypt;
    {
    int off=length/8-1;
    des_cblock niv1,niv2;

printf("3cbc\n");
xp(iv1);
xp(iv1);
xp(iv2);
xp(input);
    if (encrypt == DES_ENCRYPT)
        {
        des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
        if (length >= sizeof(des_cblock))
            bcopy(output[off],niv1,sizeof(des_cblock));
        des_cbc_encrypt(output,output,length,ks2,iv1,!encrypt);
        des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
        if (length >= sizeof(des_cblock))
            bcopy(output[off],niv2,sizeof(des_cblock));
        bcopy(niv1,*iv1,sizeof(des_cblock));
        }
    else
        {
        if (length >= sizeof(des_cblock))
            bcopy(input[off],niv1,sizeof(des_cblock));
        des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
        des_cbc_encrypt(output,output,length,ks2,iv2,!encrypt);
        if (length >= sizeof(des_cblock))
            bcopy(output[off],niv2,sizeof(des_cblock));
        des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
        }
    bcopy(niv1,iv1,sizeof(des_cblock));
    bcopy(niv2,iv2,sizeof(des_cblock));
xp(iv1);
xp(iv1);
xp(iv2);
xp(output);
    return(0);
    }

xp(a)
unsigned char *a;
{ int i; for(i=0; i<8; i++) printf("%02X",a[i]);printf("\n");}