Example usage for java.security SignatureException getCause

Introduction

In this page you can find the example usage for java.security SignatureException getCause.

Prototype

public synchronized Throwable getCause() 

Source Link

Document

Returns the cause of this throwable or null if the cause is nonexistent or unknown.

Usage

From source file:com.xinferin.licensing.LicenceGenerator.java

/**
 * Signs the data and returns the signature.
 * @param toBeSigned Data to be signed//from  ww w .  ja  va2s.c  o  m
 * @return byte[] Signature
 * @throws Exception 
*/
public byte[] signData(byte[] toBeSigned) throws Exception {

    try {
        if (privateKey == null)
            initialisePrivateKey();

        Signature signatureInstance = Signature.getInstance("SHA1withRSA");
        signatureInstance.initSign(privateKey);
        signatureInstance.update(toBeSigned);

        return signatureInstance.sign();

    } catch (NoSuchAlgorithmException ex) {
        throw new Exception("The SHA1withRSA algorithm was not found. " + ex.getCause());
    } catch (InvalidKeyException in) {
        throw new Exception("Invalid key returned from database. " + in.getCause());
    } catch (SignatureException se) {
        throw new Exception("No signature instance can be created. " + se.getCause());
    }
}

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