1 #include "os.h"
2 #include <libsec.h>
3
4 /* rfc2898 */
5 void
pbkdf2_x(p,plen,s,slen,rounds,d,dlen,x,xlen)6 pbkdf2_x(p, plen, s, slen, rounds, d, dlen, x, xlen)
7 uchar *p, *s, *d;
8 ulong plen, slen, dlen, rounds;
9 DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
10 int xlen;
11 {
12 uchar block[256], tmp[256];
13 ulong i, j, k, n;
14 DigestState *ds;
15
16 assert(xlen <= sizeof(tmp));
17
18 for(i = 1; dlen > 0; i++, d += n, dlen -= n){
19 tmp[3] = i;
20 tmp[2] = i >> 8;
21 tmp[1] = i >> 16;
22 tmp[0] = i >> 24;
23 ds = (*x)(s, slen, p, plen, nil, nil);
24 (*x)(tmp, 4, p, plen, block, ds);
25 memmove(tmp, block, xlen);
26 for(j = 1; j < rounds; j++){
27 (*x)(tmp, xlen, p, plen, tmp, nil);
28 for(k=0; k<xlen; k++)
29 block[k] ^= tmp[k];
30 }
31 n = dlen > xlen ? xlen : dlen;
32 memmove(d, block, n);
33 }
34 }
35