Subversion Repositories planix.SVN

#include "os.h"
#include <libsec.h>

// I wasn't sure what to do when the buffer was not
// a multiple of 8.  I did what lacy's cryptolib did
// to be compatible, but it looks dangerous to me
// since its encrypting plain text with the key. -- presotto

void
desECBencrypt(uchar *p, int len, DESstate *s)
{
        int i;
        uchar tmp[8];

        for(; len >= 8; len -= 8){
                block_cipher(s->expanded, p, 0);
                p += 8;
        }
        
        if(len > 0){
                for (i=0; i<8; i++)
                        tmp[i] = i;
                block_cipher(s->expanded, tmp, 0);
                for (i = 0; i < len; i++)
                        p[i] ^= tmp[i];
        }
}

void
desECBdecrypt(uchar *p, int len, DESstate *s)
{
        int i;
        uchar tmp[8];

        for(; len >= 8; len -= 8){
                block_cipher(s->expanded, p, 1);
                p += 8;
        }
        
        if(len > 0){
                for (i=0; i<8; i++)
                        tmp[i] = i;
                block_cipher(s->expanded, tmp, 0);
                for (i = 0; i < len; i++)
                        p[i] ^= tmp[i];
        }
}