JavaDataStructures/ECC/PrivateKey.java at master · benaich/JavaDataStructures · GitHub

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package ECC;

import java.math.BigInteger;

import java.nio.charset.StandardCharsets;

import java.nio.file.Files;

import java.nio.file.Paths;

import java.util.List;

/**

* The private key of the El Gamal Elliptic Curve Cryptography.

* The key consists of: c, the elliptic curve used in the calculations, k is the

* private key, a randomly-generated integer, satisfying 1 <= k < p-1.

public class PrivateKey {

private EllipticCurve c;

private BigInteger k;

public PrivateKey(EllipticCurve c, BigInteger k) {

this.c = c;

this.k = k;

}

public PrivateKey(String pathFile) {

try {

List<String> lines = Files.readAllLines(Paths.get(pathFile), StandardCharsets.UTF_8);

BigInteger a = new BigInteger(lines.get(0), 16);

BigInteger b = new BigInteger(lines.get(1), 16);

BigInteger p = new BigInteger(lines.get(2), 16);

BigInteger g1 = new BigInteger(lines.get(3), 16);

BigInteger g2 = new BigInteger(lines.get(4), 16);

BigInteger k = new BigInteger(lines.get(5), 16);

EllipticCurve eC = new EllipticCurve(a, b, p, new Point(g1, g2));

this.c = eC;

this.k = k;

} catch (Exception e) {

}

public void setCurve(EllipticCurve c) {

this.c = c;

}

public EllipticCurve getCurve() {

return c;

}

public void setKey(BigInteger k) {

this.k = k;

}

public BigInteger getKey() {

return k;

}

public Point getBasePoint() {

return c.getBasePoint();

}

JavaDataStructures/ECC/PrivateKey.java at master · benaich/JavaDataStructures · GitHub

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