private void readSigningKeyAndCertificate(Configuration conf) throws OfficeWriterException, IOException {
	if ((this.howc.getSigKeystoreFile()!=null) && (!"".equals(this.howc.getSigKeystoreFile()))) {
		LOG.info("Signing document");
		if ((this.howc.getSigKeystoreAlias()==null) || ("".equals(this.howc.getSigKeystoreAlias()))) {
				LOG.error("Keystore alias for signature keystore not defined. Cannot sign document");
				throw new OfficeWriterException("Keystore alias for signature keystore not defined. Cannot sign document");
		}
		if ((this.howc.getSigKeystoreType()==null) || ("".equals(this.howc.getSigKeystoreType()))) {
			LOG.error("Keystore type for signature keystore not defined. Cannot sign document");
			throw new OfficeWriterException("Keystore type for signature keystore not defined. Cannot sign document");
		}
		LOG.info("Reading keystore");
		HadoopKeyStoreManager hksm = new HadoopKeyStoreManager(conf);
		try {
			hksm.openKeyStore(new Path(this.howc.getSigKeystoreFile()), this.howc.getSigKeystoreType(), this.howc.getSigKeystorePassword());
			this.howc.setSigKey(hksm.getPrivateKey(this.howc.getSigKeystoreAlias(), this.howc.getSigKeystorePassword()));
			this.howc.setSigCertificate((X509Certificate) hksm.getCertificate(this.howc.getSigKeystoreAlias()));
		} catch (NoSuchAlgorithmException | CertificateException | KeyStoreException | IllegalArgumentException | UnrecoverableKeyException  e) {
			LOG.error("Cannopt read signing certificate. Exception: ",e);
			throw new OfficeWriterException("Cannot read keystore to obtain key and certificate for signing "+e);
		}
		
		
	}
}
private void readSigningKeyAndCertificate ( Configuration conf ) throws OfficeWriterException , IOException { if ( ( this . howc . getSigKeystoreFile ( ) != null ) && ( ! "" . equals ( this . howc . getSigKeystoreFile ( ) ) ) ) { LOG . info ( "Signing document" ) ; if ( ( this . howc . getSigKeystoreAlias ( ) == null ) || ( "" . equals ( this . howc . getSigKeystoreAlias ( ) ) ) ) { LOG . error ( "Keystore alias for signature keystore not defined. Cannot sign document" ) ; throw new OfficeWriterException ( "Keystore alias for signature keystore not defined. Cannot sign document" ) ; } if ( ( this . howc . getSigKeystoreType ( ) == null ) || ( "" . equals ( this . howc . getSigKeystoreType ( ) ) ) ) { LOG . error ( "Keystore type for signature keystore not defined. Cannot sign document" ) ; throw new OfficeWriterException ( "Keystore type for signature keystore not defined. Cannot sign document" ) ; } LOG . info ( "Reading keystore" ) ; HadoopKeyStoreManager hksm = new HadoopKeyStoreManager ( conf ) ; try { hksm . openKeyStore ( new Path ( this . howc . getSigKeystoreFile ( ) ) , this . howc . getSigKeystoreType ( ) , this . howc . getSigKeystorePassword ( ) ) ; this . howc . setSigKey ( hksm . getPrivateKey ( this . howc . getSigKeystoreAlias ( ) , this . howc . getSigKeystorePassword ( ) ) ) ; this . howc . setSigCertificate ( ( X509Certificate ) hksm . getCertificate ( this . howc . getSigKeystoreAlias ( ) ) ) ; } catch ( NoSuchAlgorithmException | CertificateException | KeyStoreException | IllegalArgumentException | UnrecoverableKeyException e ) { LOG . error ( "Cannopt read signing certificate. Exception: " , e ) ; throw new OfficeWriterException ( "Cannot read keystore to obtain key and certificate for signing " + e ) ; } } }
*
Reads the  (private) key and certificate from keystore to sign

@param conf
@throws OfficeWriterException
@throws IOException