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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/cmd/unix/drawterm/libsec/egverify.c – Rev 2

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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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int
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egverify(EGpub *pub, EGsig *sig, mpint *m)
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{
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	mpint *p = pub->p, *alpha = pub->alpha;
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	mpint *r = sig->r, *s = sig->s;
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	mpint *v1, *v2, *rs;
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	int rv = -1;
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	if(mpcmp(r, mpone) < 0 || mpcmp(r, p) >= 0)
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		return rv;
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	v1 = mpnew(0);
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	rs = mpnew(0);
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	v2 = mpnew(0);
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	mpexp(pub->key, r, p, v1);
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	mpexp(r, s, p, rs);
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	mpmul(v1, rs, v1);
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	mpmod(v1, p, v1);
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	mpexp(alpha, m, p, v2);
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	if(mpcmp(v1, v2) == 0)
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		rv = 0;
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	mpfree(v1);
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	mpfree(rs);
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	mpfree(v2);
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	return rv;
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}