Java tutorial
/** * Copyright 2014 Emmanuel Bourg * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.jsign.timestamp; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.util.Collection; import net.jsign.DigestAlgorithm; import net.jsign.asn1.authenticode.AuthenticodeTimeStampRequest; import org.bouncycastle.asn1.DERSet; import org.bouncycastle.asn1.cms.Attribute; import org.bouncycastle.asn1.cms.AttributeTable; import org.bouncycastle.asn1.cms.CMSAttributes; import org.bouncycastle.cert.X509CertificateHolder; import org.bouncycastle.cms.CMSException; import org.bouncycastle.cms.CMSSignedData; import org.bouncycastle.cms.SignerInformation; import org.bouncycastle.util.encoders.Base64; /** * Legacy Authenticode timestamping. * * @author Emmanuel Bourg * @since 1.3 */ public class AuthenticodeTimestamper extends Timestamper { public AuthenticodeTimestamper() { setURL("http://timestamp.comodoca.com/authenticode"); } protected CMSSignedData timestamp(DigestAlgorithm algo, byte[] encryptedDigest) throws IOException, TimestampingException { AuthenticodeTimeStampRequest timestampRequest = new AuthenticodeTimeStampRequest(encryptedDigest); byte[] request = Base64.encode(timestampRequest.getEncoded("DER")); HttpURLConnection conn = (HttpURLConnection) tsaurl.openConnection(); conn.setConnectTimeout(10000); conn.setReadTimeout(10000); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-type", "application/octet-stream"); conn.setRequestProperty("Content-length", String.valueOf(request.length)); conn.setRequestProperty("Accept", "application/octet-stream"); conn.setRequestProperty("User-Agent", "Transport"); conn.getOutputStream().write(request); conn.getOutputStream().flush(); if (conn.getResponseCode() >= 400) { throw new IOException("Unable to complete the timestamping due to HTTP error: " + conn.getResponseCode() + " - " + conn.getResponseMessage()); } try { byte[] response = Base64.decode(toBytes(conn.getInputStream())); return new CMSSignedData(response); } catch (Exception e) { throw new TimestampingException("Unable to complete the timestamping", e); } } @Override protected Collection<X509CertificateHolder> getExtraCertificates(CMSSignedData token) { return token.getCertificates().getMatches(null); } @Override protected AttributeTable getUnsignedAttributes(CMSSignedData token) { SignerInformation timestampSignerInformation = token.getSignerInfos().getSigners().iterator().next(); Attribute counterSignature = new Attribute(CMSAttributes.counterSignature, new DERSet(timestampSignerInformation.toASN1Structure())); return new AttributeTable(counterSignature); } private byte[] toBytes(InputStream in) throws IOException { ByteArrayOutputStream bout = new ByteArrayOutputStream(); byte[] buffer = new byte[4096]; int n; while ((n = in.read(buffer)) != -1) { bout.write(buffer, 0, n); } return bout.toByteArray(); } }