Example usage for org.bouncycastle.math.ec ECPoint subtract

Introduction

In this page you can find the example usage for org.bouncycastle.math.ec ECPoint subtract.

Prototype

public abstract ECPoint subtract(ECPoint b);

Source Link

Usage

From source file:com.example.quangadmin.smsencrypfinal.Khoigiaima.Makhoa.java

public void Giaima2(BigInteger r, BigInteger v, BigInteger m, ECPoint Pc1, ECPoint Pc2, ECPoint PublicKEYSender,
        BigInteger PrivateKEYReceiver) {
    BigInteger w = v.modInverse(ecc.getQ());
    BigInteger vvv;/* ww  w  .  ja v a2 s  . c  om*/
    BigInteger u1 = m.multiply(w).mod(ecc.getQ());
    BigInteger u2 = r.multiply(w).mod(ecc.getQ());

    ECPoint X = (ecc.getG().multiply(u1)).add(PublicKEYSender.multiply(u2));
    if (X == null) {
        this.verify = false;
    } else {
        vvv = X.getX().toBigInteger().mod(ecc.getQ());
        if (vvv.equals(r)) {
            this.verify = true;
        }
    }
    ECPoint Pm = Pc2.subtract(Pc1.multiply(PrivateKEYReceiver));
    aes.Decryp(m.toByteArray(), new SHA256().SHA256(Pm));
    this.plaintext = aes.getPlaintext();
}

---