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