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#include "os.h"
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#include <mp.h>
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#include <libsec.h>
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mpint*
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egencrypt(EGpub *pub, mpint *in, mpint *out)
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{
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	mpint *m, *k, *gamma, *delta, *pm1;
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	mpint *p = pub->p, *alpha = pub->alpha;
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	int plen = mpsignif(p);
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	int shift = ((plen+Dbits)/Dbits)*Dbits;
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	// in libcrypt version, (int)(LENGTH(pub->p)*sizeof(NumType)*CHARBITS);
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	if(out == nil)
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		out = mpnew(0);
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	pm1 = mpnew(0);
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	m = mpnew(0);
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	gamma = mpnew(0);
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	delta = mpnew(0);
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	mpmod(in, p, m);
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	while(1){
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		k = mprand(plen, genrandom, nil);
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		if((mpcmp(mpone, k) <= 0) && (mpcmp(k, pm1) < 0))
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			break;
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	}
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	mpexp(alpha, k, p, gamma);
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	mpexp(pub->key, k, p, delta);
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	mpmul(m, delta, delta);
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	mpmod(delta, p, delta);
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	mpleft(gamma, shift, out);
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	mpadd(delta, out, out);
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	mpfree(pm1);
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	mpfree(m);
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	mpfree(k);
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	mpfree(gamma);
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	mpfree(delta);
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	return out;
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}