private void initFromKey(Key key) throws InvalidKeyException {
// BEGIN android-removed
// if (agreement instanceof ECMQVBasicAgreement)
// {
// if (!(key instanceof MQVPrivateKey))
// {
// throw new InvalidKeyException(kaAlgorithm + " key agreement requires "
// + getSimpleName(MQVPrivateKey.class) + " for initialisation");
// }
//
// MQVPrivateKey mqvPrivKey = (MQVPrivateKey)key;
// ECPrivateKeyParameters staticPrivKey = (ECPrivateKeyParameters)
// ECUtil.generatePrivateKeyParameter(mqvPrivKey.getStaticPrivateKey());
// ECPrivateKeyParameters ephemPrivKey = (ECPrivateKeyParameters)
// ECUtil.generatePrivateKeyParameter(mqvPrivKey.getEphemeralPrivateKey());
//
// ECPublicKeyParameters ephemPubKey = null;
// if (mqvPrivKey.getEphemeralPublicKey() != null)
// {
// ephemPubKey = (ECPublicKeyParameters)
// ECUtil.generatePublicKeyParameter(mqvPrivKey.getEphemeralPublicKey());
// }
//
// MQVPrivateParameters localParams = new MQVPrivateParameters(staticPrivKey, ephemPrivKey,
// ephemPubKey);
// this.parameters = staticPrivKey.getParameters();
//
// // TODO Validate that all the keys are using the same parameters?
//
// agreement.init(localParams);
// }
// else
// END android-removed
{
if (!(key instanceof PrivateKey)) {
throw new InvalidKeyException(
kaAlgorithm
+ " key agreement requires "
+ getSimpleName(ECPrivateKey.class)
+ " for initialisation");
}
ECPrivateKeyParameters privKey =
(ECPrivateKeyParameters) ECUtil.generatePrivateKeyParameter((PrivateKey) key);
this.parameters = privKey.getParameters();
agreement.init(privKey);
}
}
public static byte[] privateKeyToPublicKey(String private_key, boolean compressed) {
byte[] privateKeyBytes = null;
try {
privateKeyBytes = org.apache.commons.codec.binary.Hex.decodeHex(private_key.toCharArray());
} catch (DecoderException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
X9ECParameters ecp = SECNamedCurves.getByName("secp256k1");
ECDomainParameters domainParams =
new ECDomainParameters(ecp.getCurve(), ecp.getG(), ecp.getN(), ecp.getH(), ecp.getSeed());
ECPrivateKeyParameters privateKey =
new ECPrivateKeyParameters(new BigInteger(1, privateKeyBytes), domainParams);
System.out.println(privateKey.getD());
byte[] publicKeyBIBytes = privateKey.getD().toByteArray();
ECPoint Q = domainParams.getG().multiply(new BigInteger(publicKeyBIBytes));
byte[] publicKeyBytes = Q.getEncoded(compressed);
return publicKeyBytes;
}