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26 7u83 1 
#include "os.h"
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#include <libsec.h>
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/* rfc2898 */
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void
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pbkdf2_x(p, plen, s, slen, rounds, d, dlen, x, xlen)
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	uchar *p, *s, *d;
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	ulong plen, slen, dlen, rounds;
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	DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
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	int xlen;
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{
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	uchar block[256], tmp[256];
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	ulong i, j, k, n;
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	DigestState *ds;
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	assert(xlen <= sizeof(tmp));
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	for(i = 1; dlen > 0; i++, d += n, dlen -= n){
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		tmp[3] = i;
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		tmp[2] = i >> 8;
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		tmp[1] = i >> 16;
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		tmp[0] = i >> 24;
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		ds = (*x)(s, slen, p, plen, nil, nil);
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		(*x)(tmp, 4, p, plen, block, ds);
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		memmove(tmp, block, xlen);
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		for(j = 1; j < rounds; j++){
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			(*x)(tmp, xlen, p, plen, tmp, nil);
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			for(k=0; k<xlen; k++)
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				block[k] ^= tmp[k];
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		}
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		n = dlen > xlen ? xlen : dlen;
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		memmove(d, block, n);
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	}
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}