001package org.hl7.fhir.dstu3.utils;
002
003/*
004  Copyright (c) 2011+, HL7, Inc.
005  All rights reserved.
006  
007  Redistribution and use in source and binary forms, with or without modification, 
008  are permitted provided that the following conditions are met:
009    
010   * Redistributions of source code must retain the above copyright notice, this 
011     list of conditions and the following disclaimer.
012   * Redistributions in binary form must reproduce the above copyright notice, 
013     this list of conditions and the following disclaimer in the documentation 
014     and/or other materials provided with the distribution.
015   * Neither the name of HL7 nor the names of its contributors may be used to 
016     endorse or promote products derived from this software without specific 
017     prior written permission.
018  
019  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028  POSSIBILITY OF SUCH DAMAGE.
029  
030 */
031
032
033
034import java.io.ByteArrayInputStream;
035import java.io.IOException;
036import java.io.OutputStream;
037import java.security.InvalidAlgorithmParameterException;
038import java.security.KeyException;
039import java.security.KeyPair;
040import java.security.KeyPairGenerator;
041import java.security.NoSuchAlgorithmException;
042import java.util.Collections;
043
044import javax.xml.crypto.MarshalException;
045import javax.xml.crypto.dsig.CanonicalizationMethod;
046import javax.xml.crypto.dsig.DigestMethod;
047import javax.xml.crypto.dsig.Reference;
048import javax.xml.crypto.dsig.SignatureMethod;
049import javax.xml.crypto.dsig.SignedInfo;
050import javax.xml.crypto.dsig.Transform;
051import javax.xml.crypto.dsig.XMLSignature;
052import javax.xml.crypto.dsig.XMLSignatureException;
053import javax.xml.crypto.dsig.XMLSignatureFactory;
054import javax.xml.crypto.dsig.dom.DOMSignContext;
055import javax.xml.crypto.dsig.keyinfo.KeyInfo;
056import javax.xml.crypto.dsig.keyinfo.KeyInfoFactory;
057import javax.xml.crypto.dsig.keyinfo.KeyValue;
058import javax.xml.crypto.dsig.spec.C14NMethodParameterSpec;
059import javax.xml.crypto.dsig.spec.TransformParameterSpec;
060import javax.xml.parsers.DocumentBuilder;
061import javax.xml.parsers.DocumentBuilderFactory;
062import javax.xml.parsers.ParserConfigurationException;
063
064import org.hl7.fhir.exceptions.FHIRException;
065import org.hl7.fhir.utilities.xml.XmlGenerator;
066import org.w3c.dom.Document;
067import org.xml.sax.SAXException;
068
069public class DigitalSignatures {
070
071
072  public static void main(String[] args) throws SAXException, IOException, ParserConfigurationException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, KeyException, MarshalException, XMLSignatureException, FHIRException, org.hl7.fhir.exceptions.FHIRException {
073    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html
074    //
075    byte[] inputXml = "<Envelope xmlns=\"urn:envelope\">\r\n</Envelope>\r\n".getBytes();
076    // load the document that's going to be signed
077    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
078    dbf.setNamespaceAware(true);
079    DocumentBuilder builder = dbf.newDocumentBuilder();  
080    Document doc = builder.parse(new ByteArrayInputStream(inputXml)); 
081    
082    // create a key pair
083    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
084    kpg.initialize(512);
085    KeyPair kp = kpg.generateKeyPair(); 
086    
087    // sign the document
088    DOMSignContext dsc = new DOMSignContext(kp.getPrivate(), doc.getDocumentElement()); 
089    XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM"); 
090   
091    Reference ref = fac.newReference("", fac.newDigestMethod(DigestMethod.SHA1, null), Collections.singletonList(fac.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null)), null, null);
092    SignedInfo si = fac.newSignedInfo(fac.newCanonicalizationMethod(CanonicalizationMethod.INCLUSIVE, (C14NMethodParameterSpec) null), fac.newSignatureMethod(SignatureMethod.RSA_SHA1, null), Collections.singletonList(ref));
093    
094    KeyInfoFactory kif = fac.getKeyInfoFactory(); 
095    KeyValue kv = kif.newKeyValue(kp.getPublic());
096    KeyInfo ki = kif.newKeyInfo(Collections.singletonList(kv));
097    XMLSignature signature = fac.newXMLSignature(si, ki); 
098    signature.sign(dsc);
099    
100    OutputStream os = System.out;
101    new XmlGenerator().generate(doc.getDocumentElement(), os);
102  }
103}