Example usage for org.bouncycastle.jce.interfaces ElGamalPublicKey getY

Introduction

In this page you can find the example usage for org.bouncycastle.jce.interfaces ElGamalPublicKey getY.

Prototype

public BigInteger getY();

Source Link

Usage

From source file:ElGamalPublicPGKey.java

License:Open Source License

public ElGamalPublicPGKey(ElGamalPublicKey key) {
    this.y = key.getY();
    this.elSpec = key.getParameters();
}

---

From source file:SELSKeyGen.java

License:Open Source License

private static void LKKeyGen(String userId, String LKPass, int expsec) throws Exception {
    KeyPairGenerator dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    KeyPair dsaKp;//from ww  w .j  a va 2 s  .  c o  m
    KeyPairGenerator elgKpg;
    ElGamalParameterSpec elParams = new ElGamalParameterSpec(p, g);
    KeyPair elgKp;

    dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    dsaKpg.initialize(1024);
    dsaKp = dsaKpg.generateKeyPair();

    elgKpg = KeyPairGenerator.getInstance("ELGAMAL", "BC");
    elgKpg.initialize(elParams);

    // generate a random BigInteger
    // BigInteger r = genRandom();

    ElGamalPublicKey pubKeyLM;
    ElGamalPublicKey pubKeyLS;
    //   LM
    PGPPublicKey pgpPubKey = readPublicKey(new FileInputStream(SELS_LIST_PATH + "/LM_pub.asc"));

    pubKeyLM = (ElGamalPublicKey) pgpPubKey.getKey("BC");
    BigInteger PK_LM = pubKeyLM.getY();

    //   LS
    pgpPubKey = readPublicKey(new FileInputStream(SELS_LIST_PATH + "/LS_pub.asc"));

    pubKeyLS = (ElGamalPublicKey) pgpPubKey.getKey("BC");
    BigInteger PK_LS = pubKeyLS.getY();

    // List Key
    FileOutputStream out1 = new FileOutputStream(SELS_LIST_PATH + "/rev_secret.asc");
    FileOutputStream out2 = new FileOutputStream(SELS_LIST_PATH + "/LK_pub.asc");

    dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    dsaKpg.initialize(1024);
    dsaKp = dsaKpg.generateKeyPair();

    BigInteger y = PK_LS.multiply(PK_LM).mod(p);

    System.out.println(y);

    ElGamalPrivateKeySpec privSpec = new ElGamalPrivateKeySpec(new BigInteger("0"), elParams);
    ElGamalPublicKeySpec pubSpec = new ElGamalPublicKeySpec(y, elParams);
    ElGamalPublicPGKey pubKey = new ElGamalPublicPGKey(pubSpec);
    ElGamalPrivatePGKey secKey = new ElGamalPrivatePGKey(privSpec);

    elgKp = new KeyPair(pubKey, secKey);
    exportKeyPair(out1, out2, dsaKp, elgKp, userId, LKPass.toCharArray(), true, expsec);

}

---

From source file:genkeys.java

License:Open Source License

private static PublicKeyPacket publicKeyPacket(PublicKey key, int algorithm, Date time) throws PGPException {
    BCPGKey bcpgKey;//from   w w  w.j ava 2 s . c o  m
    if (key instanceof RSAPublicKey) {
        RSAPublicKey rK = (RSAPublicKey) key;
        bcpgKey = new RSAPublicBCPGKey(rK.getModulus(), rK.getPublicExponent());
    } else if (key instanceof DSAPublicKey) {
        DSAPublicKey dK = (DSAPublicKey) key;
        DSAParams dP = dK.getParams();
        bcpgKey = new DSAPublicBCPGKey(dP.getP(), dP.getQ(), dP.getG(), dK.getY());
    } else if (key instanceof ElGamalPublicKey) {
        ElGamalPublicKey eK = (ElGamalPublicKey) key;
        ElGamalParameterSpec eS = eK.getParameters();
        bcpgKey = new ElGamalPublicBCPGKey(eS.getP(), eS.getG(), eK.getY());
    } else {
        throw new PGPException("unknown key class");
    }

    return new PublicKeyPacket(algorithm, time, bcpgKey);
}

---