Example usage for org.bouncycastle.bcpg SecretKeyPacket USAGE_CHECKSUM

Introduction

In this page you can find the example usage for org.bouncycastle.bcpg SecretKeyPacket USAGE_CHECKSUM.

Prototype

int USAGE_CHECKSUM

To view the source code for org.bouncycastle.bcpg SecretKeyPacket USAGE_CHECKSUM.

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Usage

From source file:genkeys.java

License:Open Source License

private static SecretKeyPacket secretKeyPacket(KeyPair key, int cipher, boolean useSHA1, S2K s2k, String pass)
        throws NoSuchProviderException, PGPException {
    int algorithm;
    if (key.getPrivate().getAlgorithm() == "RSA") {
        algorithm = PGPPublicKey.RSA_GENERAL;
    } else {/*from  w  ww .  ja  va  2 s  .co m*/
        algorithm = PGPPublicKey.DSA;
    }

    Date time = new Date();
    PGPKeyPair keyPair = new PGPKeyPair(algorithm, key.getPublic(), key.getPrivate(), time, "BC");

    PublicKeyPacket pubPk = publicKeyPacket(key.getPublic(), algorithm, time);
    BCPGObject secKey;
    switch (keyPair.getPublicKey().getAlgorithm()) {
    case PGPPublicKey.RSA_ENCRYPT:
    case PGPPublicKey.RSA_SIGN:
    case PGPPublicKey.RSA_GENERAL:
        RSAPrivateCrtKey rsK = (RSAPrivateCrtKey) keyPair.getPrivateKey().getKey();
        secKey = new RSASecretBCPGKey(rsK.getPrivateExponent(), rsK.getPrimeP(), rsK.getPrimeQ());
        break;
    case PGPPublicKey.DSA:
        DSAPrivateKey dsK = (DSAPrivateKey) keyPair.getPrivateKey().getKey();
        secKey = new DSASecretBCPGKey(dsK.getX());
        break;
    case PGPPublicKey.ELGAMAL_ENCRYPT:
    case PGPPublicKey.ELGAMAL_GENERAL:
        ElGamalPrivateKey esK = (ElGamalPrivateKey) keyPair.getPrivateKey().getKey();
        secKey = new ElGamalSecretBCPGKey(esK.getX());
        break;
    default:
        throw new PGPException("unknown key class");
    }

    Cipher c = cipher(cipher);

    SecretKeyPacket secPk;
    try {
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        BCPGOutputStream pOut = new BCPGOutputStream(bOut);

        pOut.writeObject(secKey);

        byte[] keyData = bOut.toByteArray();

        pOut.write(checksum(useSHA1, keyData, keyData.length));

        if (c != null) {
            SecretKey skey = PGPUtil.makeKeyFromPassPhrase(cipher, s2k, pass.toCharArray(), "BC");

            c.init(Cipher.ENCRYPT_MODE, skey, new SecureRandom());
            byte[] iv = c.getIV();
            byte[] encData = c.doFinal(bOut.toByteArray());

            if (useSHA1) {
                secPk = new SecretKeyPacket(pubPk, cipher, SecretKeyPacket.USAGE_SHA1, s2k, iv, encData);
            } else {
                secPk = new SecretKeyPacket(pubPk, cipher, SecretKeyPacket.USAGE_CHECKSUM, s2k, iv, encData);
            }
        } else {
            secPk = new SecretKeyPacket(pubPk, cipher, null, null, bOut.toByteArray());
        }
    } catch (PGPException e) {
        throw e;
    } catch (Exception e) {
        throw new PGPException("Exception encrypting key", e);
    }

    return secPk;
}

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