Example usage for java.security.interfaces RSAPrivateKey getModulus

Introduction

In this page you can find the example usage for java.security.interfaces RSAPrivateKey getModulus.

Prototype

public BigInteger getModulus();

Source Link

Document

Returns the modulus.

Usage

From source file:org.kaaproject.kaa.common.endpoint.security.KeyUtil.java

/**
 * Validates RSA public and private key.
 *
 * @param keyPair the keypair/*from   ww w  . java  2  s . c  om*/
 * @return true if keys matches
 */
public static boolean validateKeyPair(KeyPair keyPair) {
    RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
    RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

    if (publicKey.getModulus().bitLength() != privateKey.getModulus().bitLength()) {
        LOG.error("Keypair length matching error");
        return false;
    }

    byte[] rawPayload = new byte[64];
    new Random().nextBytes(rawPayload);

    MessageEncoderDecoder encDec = new MessageEncoderDecoder(privateKey, publicKey);
    byte[] encodedPayload;
    byte[] decodedPayload;
    try {
        encodedPayload = encDec.encodeData(rawPayload);
        decodedPayload = encDec.decodeData(encodedPayload);
    } catch (GeneralSecurityException ex) {
        LOG.error("Validation keypair error ", ex);
        return false;
    }
    return Arrays.equals(rawPayload, decodedPayload);
}