Subversion Repositories planix.SVN

#include "ssh.h"

struct CipherState
{
        DESstate enc3des[3];
        DESstate dec3des[3];
};

static CipherState*
init3des(Conn *c, int)
{
        int i;
        CipherState *cs;

        cs = emalloc(sizeof(CipherState));
        for(i=0; i<3; i++){
                setupDESstate(&cs->enc3des[i], c->sesskey+8*i, nil);
                setupDESstate(&cs->dec3des[i], c->sesskey+8*i, nil);
        }
        return cs;
}

static void
encrypt3des(CipherState *cs, uchar *buf, int nbuf)
{
        desCBCencrypt(buf, nbuf, &cs->enc3des[0]);
        desCBCdecrypt(buf, nbuf, &cs->enc3des[1]);
        desCBCencrypt(buf, nbuf, &cs->enc3des[2]);
}

static void
decrypt3des(CipherState *cs, uchar *buf, int nbuf)
{
        desCBCdecrypt(buf, nbuf, &cs->dec3des[2]);
        desCBCencrypt(buf, nbuf, &cs->dec3des[1]);
        desCBCdecrypt(buf, nbuf, &cs->dec3des[0]);
}

Cipher cipher3des =
{
        SSH_CIPHER_3DES,
        "3des",
        init3des,
        encrypt3des,
        decrypt3des,
};