Code example for InvalidKeyException

0
        PrivateKey  privateKey)
        throws InvalidKeyException
    { 
		if ( !(privateKey instanceof RSAPrivateKey) )
		{ 
			throw new InvalidKeyException("Supplied key is not a RSAPrivateKey instance");
		} 
 
        CipherParameters    param = RSAUtil.generatePrivateKeyParameter((RSAPrivateKey)privateKey);
 
        digest.reset();
 
        cipher.init(true, param);
    } 
 
    protected void engineUpdate( 
        byte    b)
        throws SignatureExceptiondigest.update(b);
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