Subversion Repositories planix.SVN

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

// Because of the way that non multiple of 8
// buffers are handled, the decryptor must
// be fed buffers of the same size as the
// encryptor


// If the length is not a multiple of 8, I encrypt
// the overflow to be compatible with lacy's cryptlib
void
des3CBCencrypt(uchar *p, int len, DES3state *s)
{
        uchar *p2, *ip, *eip;

        for(; len >= 8; len -= 8){
                p2 = p;
                ip = s->ivec;
                for(eip = ip+8; ip < eip; )
                        *p2++ ^= *ip++;
                triple_block_cipher(s->expanded, p, DES3EDE);
                memmove(s->ivec, p, 8);
                p += 8;
        }

        if(len > 0){
                ip = s->ivec;
                triple_block_cipher(s->expanded, ip, DES3EDE);
                for(eip = ip+len; ip < eip; )
                        *p++ ^= *ip++;
        }
}

void
des3CBCdecrypt(uchar *p, int len, DES3state *s)
{
        uchar *ip, *eip, *tp;
        uchar tmp[8];

        for(; len >= 8; len -= 8){
                memmove(tmp, p, 8);
                triple_block_cipher(s->expanded, p, DES3DED);
                tp = tmp;
                ip = s->ivec;
                for(eip = ip+8; ip < eip; ){
                        *p++ ^= *ip;
                        *ip++ = *tp++;
                }
        }

        if(len > 0){
                ip = s->ivec;
                triple_block_cipher(s->expanded, ip, DES3EDE);
                for(eip = ip+len; ip < eip; )
                        *p++ ^= *ip++;
        }
}