Example usage for org.bouncycastle.jce.spec ElGamalPrivateKeySpec ElGamalPrivateKeySpec

Introduction

In this page you can find the example usage for org.bouncycastle.jce.spec ElGamalPrivateKeySpec ElGamalPrivateKeySpec.

Prototype

public ElGamalPrivateKeySpec(BigInteger x, ElGamalParameterSpec spec) 

Source Link

Usage

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;/*  w  w  w.j  a  v  a 2 s . com*/
    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);

}

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From source file:SELSKeyGen.java

License:Open Source License

private static void CKeyGen(String userid, String randomStr, String LSPass, int expsec) throws Exception {
    KeyPairGenerator dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    KeyPair dsaKp;//from ww w .  j a v a 2s. c om
    //KeyPairGenerator    elgKpg;           
    ElGamalParameterSpec elParams = new ElGamalParameterSpec(p, g);
    KeyPair elgKp;

    System.out.println(userid);
    System.out.println(randomStr);
    System.out.println(LSPass);
    // read a random BigInteger
    BigInteger r = new BigInteger(randomStr);

    //   LS
    PGPPublicKey pgpPubKey = readPublicKey(new FileInputStream(SELS_LIST_PATH + "/LS_pub.asc"));
    PGPPrivateKey pgpSecKey = findSecretKey(new FileInputStream(SELS_LIST_PATH + "/LS_secret.asc"),
            pgpPubKey.getKeyID(), LSPass.toCharArray());

    secKeyLS = (ElGamalPrivateKey) pgpSecKey.getKey();
    BigInteger K_LS = secKeyLS.getX();

    //   User A's correspoding
    FileOutputStream out1 = new FileOutputStream(SELS_LIST_PATH + "/" + userid + "_secret.asc");
    FileOutputStream out2 = new FileOutputStream(SELS_LIST_PATH + "/" + userid + "_pub.asc");

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

    if (paramFlag == 1)
        x = K_LS.subtract(r).mod(p);
    else
        x = K_LS.subtract(r).mod(q);
    BigInteger y = g.modPow(x, p);

    ElGamalPrivateKeySpec privSpec = new ElGamalPrivateKeySpec(x, 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, LSPass.toCharArray(), true, expsec);

}

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From source file:SELSKeyGen.java

License:Open Source License

private static void userKeyGen(String subuserid, String servuserid, String subuserIdHash, String servuserIdHash,
        String LMPass, String userPass, int expsec) throws Exception {

    // this takes a while as the key generator has to generate 
    // some DSA params
    // before it generates the key.
    KeyPairGenerator dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    KeyPair dsaKp;/*from  www. j  a  va 2s. c o m*/
    //KeyPairGenerator    elgKpg;           
    ElGamalParameterSpec elParams = new ElGamalParameterSpec(p, g);

    // this is quicker because we are using pregenerated parameters.
    KeyPair elgKp;// = elgKpg.generateKeyPair();

    System.out.println(subuserid);
    System.out.println(servuserid);
    // generate a random BigInteger
    BigInteger r = genRandom();

    //   LM
    PGPPublicKey pgpPubKey = readPublicKey(new FileInputStream(SELS_LIST_PATH + "/LM_pub.asc"));
    PGPPrivateKey pgpSecKey = findSecretKey(new FileInputStream(SELS_LIST_PATH + "/LM_secret.asc"),
            pgpPubKey.getKeyID(), LMPass.toCharArray());

    secKeyLM = (ElGamalPrivateKey) pgpSecKey.getKey();
    BigInteger K_LM = secKeyLM.getX();

    //   User A's sub key
    FileOutputStream out1 = new FileOutputStream(SELS_LIST_PATH + "/" + subuserIdHash + "_subsecret.asc");
    FileOutputStream out2 = new FileOutputStream(SELS_LIST_PATH + "/" + subuserIdHash + "_subpub.asc");

    //    User A's serv key
    FileOutputStream out3 = new FileOutputStream(SELS_LIST_PATH + "/" + servuserIdHash + "_servsecret.asc");
    FileOutputStream out4 = new FileOutputStream(SELS_LIST_PATH + "/" + servuserIdHash + "_servpub.asc");

    dsaKpg = KeyPairGenerator.getInstance("DSA", "BC");
    dsaKpg.initialize(1024);
    dsaKp = dsaKpg.generateKeyPair();
    BigInteger x;
    if (paramFlag == 1)
        x = K_LM.add(r).mod(p);
    else
        x = K_LM.add(r).mod(q);

    BigInteger y = g.modPow(x, p);

    ElGamalPrivateKeySpec privSpec = new ElGamalPrivateKeySpec(x, 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, subuserid, userPass.toCharArray(), true, expsec);
    exportKeyPair(out3, out4, dsaKp, elgKp, servuserid, userPass.toCharArray(), true, expsec);

}

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