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#include "os.h"
#include <mp.h>
#include <libsec.h>
void
pbkdf2_hmac_sha1(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen)
{
uchar block[SHA1dlen], tmp[SHA1dlen], tmp2[SHA1dlen];
ulong i, j, k, n;
DigestState *ds;
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 = hmac_sha1(s, slen, p, plen, nil, nil);
hmac_sha1(tmp, 4, p, plen, block, ds);
memmove(tmp, block, sizeof(tmp));
for(j = 1; j < rounds; j++){
hmac_sha1(tmp, sizeof(tmp), p, plen, tmp2, nil);
memmove(tmp, tmp2, sizeof(tmp));
for(k=0; k<sizeof(tmp); k++)
block[k] ^= tmp[k];
}
n = dlen > sizeof(block) ? sizeof(block) : dlen;
memmove(d, block, n);
}
}
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