001package org.hl7.fhir.r5.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.Utilities;
064import org.hl7.fhir.utilities.xml.XmlGenerator;
065import org.w3c.dom.Document;
066
067public class DigitalSignatures {
068
069  public static PrivateKey getPrivateKey(String filename) throws Exception {
070
071    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
072
073    PKCS8EncodedKeySpec spec =
074        new PKCS8EncodedKeySpec(keyBytes);
075    KeyFactory kf = KeyFactory.getInstance("RSA");
076    return kf.generatePrivate(spec);
077  }
078
079  public static PublicKey getPublicKey(String filename) throws Exception {
080
081    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
082
083    X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
084    KeyFactory kf = KeyFactory.getInstance("RSA");
085    return kf.generatePublic(spec);
086  }
087
088  public static void main(String[] args) throws Exception {
089    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html
090    //
091    byte[] inputXml = "<Envelope xmlns=\"urn:envelope\">\r\n</Envelope>\r\n".getBytes();
092    // load the document that's going to be signed
093    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
094    dbf.setNamespaceAware(true);
095    DocumentBuilder builder = dbf.newDocumentBuilder();  
096    Document doc = builder.parse(new ByteArrayInputStream(inputXml)); 
097    
098//    // create a key pair
099//    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
100//    kpg.initialize(512);
101//    KeyPair kp = kpg.generateKeyPair(); 
102    PublicKey pub = getPublicKey("C:\\work\\fhirserver\\tests\\signatures\\public_key.der");
103    PrivateKey priv = getPrivateKey("C:\\work\\fhirserver\\tests\\signatures\\private_key.der");
104    
105    // sign the document
106    DOMSignContext dsc = new DOMSignContext(priv, doc.getDocumentElement()); 
107    XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM"); 
108   
109    Reference ref = fac.newReference("", fac.newDigestMethod(DigestMethod.SHA1, null), Collections.singletonList(fac.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null)), null, null);
110    SignedInfo si = fac.newSignedInfo(fac.newCanonicalizationMethod(CanonicalizationMethod.INCLUSIVE, (C14NMethodParameterSpec) null), 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}