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clean code (#555)

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m2049r 2019-03-10 22:00:57 +01:00 committed by GitHub
parent 81d94478f2
commit 95f2ca74a6
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1 changed files with 6 additions and 6 deletions
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12
app/src/main/java/com/m2049r/xmrwallet/util/ledger/ECsecp256k1.java
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@ -28,6 +28,7 @@ import java.security.spec.ECPoint;
public class ECsecp256k1 {
static private final BigInteger TWO = new BigInteger("2");
static private final BigInteger THREE = new BigInteger("3");
static public final BigInteger p = new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16);
static public final BigInteger a = new BigInteger("0000000000000000000000000000000000000000000000000000000000000000", 16);
static public final BigInteger b = new BigInteger("0000000000000000000000000000000000000000000000000000000000000007", 16);
@ -61,19 +62,18 @@ public class ECsecp256k1 {
return s;
else if (s.equals(ECPoint.POINT_INFINITY))
return r;
BigInteger slope = (r.getAffineY().subtract(s.getAffineY())).multiply(r.getAffineX().subtract(s.getAffineX()).modInverse(p)).mod(p);
BigInteger slope = (r.getAffineY().subtract(s.getAffineY()))
.multiply(r.getAffineX().subtract(s.getAffineX()).modInverse(p));
BigInteger Xout = (slope.modPow(TWO, p).subtract(r.getAffineX())).subtract(s.getAffineX()).mod(p);
BigInteger Yout = s.getAffineY().negate().mod(p);
Yout = Yout.add(slope.multiply(s.getAffineX().subtract(Xout))).mod(p);
BigInteger Yout = s.getAffineY().negate().add(slope.multiply(s.getAffineX().subtract(Xout))).mod(p);
return new ECPoint(Xout, Yout);
}
public static ECPoint doublePoint(ECPoint r) {
if (r.equals(ECPoint.POINT_INFINITY))
return r;
BigInteger slope = (r.getAffineX().pow(2)).multiply(new BigInteger("3"));
slope = slope.add(a);
slope = slope.multiply((r.getAffineY().multiply(TWO)).modInverse(p));
BigInteger slope = (r.getAffineX().pow(2)).multiply(THREE).add(a)
.multiply((r.getAffineY().multiply(TWO)).modInverse(p));
BigInteger Xout = slope.pow(2).subtract(r.getAffineX().multiply(TWO)).mod(p);
BigInteger Yout = (r.getAffineY().negate()).add(slope.multiply(r.getAffineX().subtract(Xout))).mod(p);
return new ECPoint(Xout, Yout);