Subversion Repositories planix.SVN

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

/* rfc2898 */
void
pbkdf2_x(p, plen, s, slen, rounds, d, dlen, x, xlen)
        uchar *p, *s, *d;
        ulong plen, slen, dlen, rounds;
        DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
        int xlen;
{
        uchar block[256], tmp[256];
        ulong i, j, k, n;
        DigestState *ds;

        assert(xlen <= sizeof(tmp));

        for(i = 1; dlen > 0; i++, d += n, dlen -= n){
                tmp[3] = i;
                tmp[2] = i >> 8;
                tmp[1] = i >> 16;
                tmp[0] = i >> 24;
                ds = (*x)(s, slen, p, plen, nil, nil);
                (*x)(tmp, 4, p, plen, block, ds);
                memmove(tmp, block, xlen);
                for(j = 1; j < rounds; j++){
                        (*x)(tmp, xlen, p, plen, tmp, nil);
                        for(k=0; k<xlen; k++)
                                block[k] ^= tmp[k];
                }
                n = dlen > xlen ? xlen : dlen;
                memmove(d, block, n); 
        }
}