Examples with ECDHUPublicParameters com.github.zhenwei.core.crypto.params.ECDHUPublicParameters used on opensource projects

Example 1 with ECDHUPublicParameters

use of com.github.zhenwei.core.crypto.params.ECDHUPublicParameters in project LinLong-Java by zhenwei1108.

the class ECDHCUnifiedAgreement method calculateAgreement.

public byte[] calculateAgreement(CipherParameters pubKey) {
    ECDHUPublicParameters pubParams = (ECDHUPublicParameters) pubKey;
    ECDHCBasicAgreement sAgree = new ECDHCBasicAgreement();
    ECDHCBasicAgreement eAgree = new ECDHCBasicAgreement();
    sAgree.init(privParams.getStaticPrivateKey());
    BigInteger sComp = sAgree.calculateAgreement(pubParams.getStaticPublicKey());
    eAgree.init(privParams.getEphemeralPrivateKey());
    BigInteger eComp = eAgree.calculateAgreement(pubParams.getEphemeralPublicKey());
    int fieldSize = getFieldSize();
    byte[] result = new byte[fieldSize * 2];
    BigIntegers.asUnsignedByteArray(eComp, result, 0, fieldSize);
    BigIntegers.asUnsignedByteArray(sComp, result, fieldSize, fieldSize);
    return result;
}

Example 2 with ECDHUPublicParameters

use of com.github.zhenwei.core.crypto.params.ECDHUPublicParameters in project LinLong-Java by zhenwei1108.

the class KeyAgreementSpi method engineDoPhase.

protected Key engineDoPhase(Key key, boolean lastPhase) throws InvalidKeyException, IllegalStateException {
    if (parameters == null) {
        throw new IllegalStateException(kaAlgorithm + " not initialised.");
    }
    if (!lastPhase) {
        throw new IllegalStateException(kaAlgorithm + " can only be between two parties.");
    }
    CipherParameters pubKey;
    if (agreement instanceof ECMQVBasicAgreement) {
        if (!(key instanceof MQVPublicKey)) {
            ECPublicKeyParameters staticKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter((PublicKey) key);
            ECPublicKeyParameters ephemKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter(mqvParameters.getOtherPartyEphemeralKey());
            pubKey = new MQVPublicParameters(staticKey, ephemKey);
        } else {
            MQVPublicKey mqvPubKey = (MQVPublicKey) key;
            ECPublicKeyParameters staticKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter(mqvPubKey.getStaticKey());
            ECPublicKeyParameters ephemKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter(mqvPubKey.getEphemeralKey());
            pubKey = new MQVPublicParameters(staticKey, ephemKey);
        }
    } else if (agreement instanceof ECDHCUnifiedAgreement) {
        ECPublicKeyParameters staticKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter((PublicKey) key);
        ECPublicKeyParameters ephemKey = (ECPublicKeyParameters) ECUtils.generatePublicKeyParameter(dheParameters.getOtherPartyEphemeralKey());
        pubKey = new ECDHUPublicParameters(staticKey, ephemKey);
    } else {
        if (!(key instanceof PublicKey)) {
            throw new InvalidKeyException(kaAlgorithm + " key agreement requires " + getSimpleName(ECPublicKey.class) + " for doPhase");
        }
        pubKey = ECUtils.generatePublicKeyParameter((PublicKey) key);
    }
    try {
        if (agreement instanceof BasicAgreement) {
            result = bigIntToBytes(((BasicAgreement) agreement).calculateAgreement(pubKey));
        } else {
            result = ((ECDHCUnifiedAgreement) agreement).calculateAgreement(pubKey);
        }
    } catch (final Exception e) {
        throw new InvalidKeyException("calculation failed: " + e.getMessage()) {

            public Throwable getCause() {
                return e;
            }
        };
    }
    return null;
}