001package org.hl7.fhir.r4.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
032import java.io.ByteArrayInputStream;
033import java.io.FileOutputStream;
034import java.io.OutputStream;
035import java.nio.file.Files;
036import java.nio.file.Paths;
037import java.security.KeyFactory;
038import java.security.PrivateKey;
039import java.security.PublicKey;
040import java.security.spec.PKCS8EncodedKeySpec;
041import java.security.spec.X509EncodedKeySpec;
042import java.util.Collections;
043
044import javax.xml.crypto.dsig.CanonicalizationMethod;
045import javax.xml.crypto.dsig.DigestMethod;
046import javax.xml.crypto.dsig.Reference;
047import javax.xml.crypto.dsig.SignatureMethod;
048import javax.xml.crypto.dsig.SignedInfo;
049import javax.xml.crypto.dsig.Transform;
050import javax.xml.crypto.dsig.XMLSignature;
051import javax.xml.crypto.dsig.XMLSignatureFactory;
052import javax.xml.crypto.dsig.dom.DOMSignContext;
053import javax.xml.crypto.dsig.keyinfo.KeyInfo;
054import javax.xml.crypto.dsig.keyinfo.KeyInfoFactory;
055import javax.xml.crypto.dsig.keyinfo.KeyValue;
056import javax.xml.crypto.dsig.spec.C14NMethodParameterSpec;
057import javax.xml.crypto.dsig.spec.TransformParameterSpec;
058import javax.xml.parsers.DocumentBuilder;
059import javax.xml.parsers.DocumentBuilderFactory;
060
061import org.hl7.fhir.utilities.Utilities;
062import org.hl7.fhir.utilities.xml.XmlGenerator;
063import org.w3c.dom.Document;
064
065public class DigitalSignatures {
066
067  public static PrivateKey getPrivateKey(String filename) throws Exception {
068
069    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
070
071    PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
072    KeyFactory kf = KeyFactory.getInstance("RSA");
073    return kf.generatePrivate(spec);
074  }
075
076  public static PublicKey getPublicKey(String filename) throws Exception {
077
078    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
079
080    X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
081    KeyFactory kf = KeyFactory.getInstance("RSA");
082    return kf.generatePublic(spec);
083  }
084
085  public static void main(String[] args) throws Exception {
086    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html
087    //
088    byte[] inputXml = "<Envelope xmlns=\"urn:envelope\">\r\n</Envelope>\r\n".getBytes();
089    // load the document that's going to be signed
090    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
091    dbf.setNamespaceAware(true);
092    DocumentBuilder builder = dbf.newDocumentBuilder();
093    Document doc = builder.parse(new ByteArrayInputStream(inputXml));
094
095//    // create a key pair
096//    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
097//    kpg.initialize(512);
098//    KeyPair kp = kpg.generateKeyPair(); 
099    PublicKey pub = getPublicKey("C:\\work\\fhirserver\\tests\\signatures\\public_key.der");
100    PrivateKey priv = getPrivateKey("C:\\work\\fhirserver\\tests\\signatures\\private_key.der");
101
102    // sign the document
103    DOMSignContext dsc = new DOMSignContext(priv, doc.getDocumentElement());
104    XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM");
105
106    Reference ref = fac.newReference("", fac.newDigestMethod(DigestMethod.SHA1, null),
107        Collections.singletonList(fac.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null)), null, null);
108    SignedInfo si = fac.newSignedInfo(
109        fac.newCanonicalizationMethod(CanonicalizationMethod.INCLUSIVE, (C14NMethodParameterSpec) null),
110        fac.newSignatureMethod(SignatureMethod.RSA_SHA1, null), Collections.singletonList(ref));
111
112    KeyInfoFactory kif = fac.getKeyInfoFactory();
113    KeyValue kv = kif.newKeyValue(pub);
114    KeyInfo ki = kif.newKeyInfo(Collections.singletonList(kv));
115    XMLSignature signature = fac.newXMLSignature(si, ki);
116    signature.sign(dsc);
117
118    OutputStream os = new FileOutputStream(Utilities.path("[tmp]", "java-digsig.xml"));
119    new XmlGenerator().generate(doc.getDocumentElement(), os);
120  }
121}