public X509Certificate getCertificate(Map context, String alias, boolean forSigning) throws XWSSecurityException {
        X509Certificate cert = null;
        if (alias != null && (!"".equals(alias) || !forSigning)) {
            Callback[] callbacks;
            if (forSigning) {
                PrivKeyCertRequest certRequest = new AliasPrivKeyCertRequest(alias);
                SignatureKeyCallback sigKeyCallback = new SignatureKeyCallback(certRequest);
                ProcessingContext.copy(sigKeyCallback.getRuntimeProperties(), context);
                callbacks = new Callback[]{sigKeyCallback};

                try {
                    this.callbackHandler.handle(callbacks);
                } catch (Exception var10) {
                    log.log(Level.SEVERE, "WSS0216.callbackhandler.handle.exception", new Object[]{"SignatureKeyCallback.AliasPrivKeyCertRequest"});
                    log.log(Level.SEVERE, "WSS0217.callbackhandler.handle.exception.log", var10);
                    throw new XWSSecurityException(var10);
                }

                cert = certRequest.getX509Certificate();
            } else {
                X509CertificateRequest certRequest = new AliasX509CertificateRequest(alias);
                EncryptionKeyCallback encKeyCallback = new EncryptionKeyCallback(certRequest);
                ProcessingContext.copy(encKeyCallback.getRuntimeProperties(), context);
                callbacks = new Callback[]{encKeyCallback};

                try {
                    this.callbackHandler.handle(callbacks);
                } catch (Exception var9) {
                    log.log(Level.SEVERE, "WSS0216.callbackhandler.handle.exception", new Object[]{"EncryptionKeyCallback.AliasX509CertificateRequest"});
                    log.log(Level.SEVERE, "WSS0217.callbackhandler.handle.exception.log", var9);
                    throw new XWSSecurityException(var9);
                }

                cert = certRequest.getX509Certificate();
            }

            if (cert == null) {
                String val = forSigning ? "Signature" : "Key Encryption";
                log.log(Level.SEVERE, "WSS0221.cannot.locate.cert", new Object[]{val});
                throw new XWSSecurityException("Unable to locate certificate for the alias '" + alias + "'");
            } else {
                return cert;
            }
        } else {
            return this.getDefaultCertificate(context);
        }
    }