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