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.filesystem.ManagedFileAccess;
065import org.hl7.fhir.utilities.xml.XMLUtil;
066import org.hl7.fhir.utilities.xml.XmlGenerator;
067import org.w3c.dom.Document;
068
069public class DigitalSignatures {
070
071  public static PrivateKey getPrivateKey(String filename) throws Exception {
072
073    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
074
075    PKCS8EncodedKeySpec spec =
076        new PKCS8EncodedKeySpec(keyBytes);
077    KeyFactory kf = KeyFactory.getInstance("RSA");
078    return kf.generatePrivate(spec);
079  }
080
081  public static PublicKey getPublicKey(String filename) throws Exception {
082
083    byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
084
085    X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
086    KeyFactory kf = KeyFactory.getInstance("RSA");
087    return kf.generatePublic(spec);
088  }
089
090  public static void main(String[] args) throws Exception {
091    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/xmldsig/XMLDigitalSignature.html
092    //
093    byte[] inputXml = "<Envelope xmlns=\"urn:envelope\">\r\n</Envelope>\r\n".getBytes();
094    // load the document that's going to be signed
095    DocumentBuilderFactory dbf = XMLUtil.newXXEProtectedDocumentBuilderFactory();
096    dbf.setNamespaceAware(true);
097    DocumentBuilder builder = dbf.newDocumentBuilder();  
098    Document doc = builder.parse(new ByteArrayInputStream(inputXml)); 
099    
100//    // create a key pair
101//    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
102//    kpg.initialize(512);
103//    KeyPair kp = kpg.generateKeyPair(); 
104    PublicKey pub = getPublicKey("C:\\work\\fhirserver\\tests\\signatures\\public_key.der");
105    PrivateKey priv = getPrivateKey("C:\\work\\fhirserver\\tests\\signatures\\private_key.der");
106    
107    // sign the document
108    DOMSignContext dsc = new DOMSignContext(priv, doc.getDocumentElement()); 
109    XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM"); 
110   
111    Reference ref = fac.newReference("", fac.newDigestMethod(DigestMethod.SHA1, null), Collections.singletonList(fac.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null)), null, null);
112    SignedInfo si = fac.newSignedInfo(fac.newCanonicalizationMethod(CanonicalizationMethod.INCLUSIVE, (C14NMethodParameterSpec) null), fac.newSignatureMethod(SignatureMethod.RSA_SHA1, null), Collections.singletonList(ref));
113    
114    KeyInfoFactory kif = fac.getKeyInfoFactory(); 
115    KeyValue kv = kif.newKeyValue(pub);
116    KeyInfo ki = kif.newKeyInfo(Collections.singletonList(kv));
117    XMLSignature signature = fac.newXMLSignature(si, ki); 
118    signature.sign(dsc);
119    
120    OutputStream os = ManagedFileAccess.outStream(Utilities.path("[tmp]", "java-digsig.xml"));
121    new XmlGenerator().generate(doc.getDocumentElement(), os);
122  }
123}