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

int
egverify(EGpub *pub, EGsig *sig, mpint *m)
{
       mpint *p = pub->p, *alpha = pub->alpha;
       mpint *r = sig->r, *s = sig->s;
       mpint *v1, *v2, *rs;
       int rv = -1;

       if(mpcmp(r, mpone) < 0 || mpcmp(r, p) >= 0)
               return rv;
       v1 = mpnew(0);
       rs = mpnew(0);
       v2 = mpnew(0);
       mpexp(pub->key, r, p, v1);
       mpexp(r, s, p, rs);
       mpmul(v1, rs, v1);
       mpmod(v1, p, v1);
       mpexp(alpha, m, p, v2);
       if(mpcmp(v1, v2) == 0)
               rv = 0;
       mpfree(v1);
       mpfree(rs);
       mpfree(v2);
       return rv;
}

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