Java example source code file (KeySelectors.java)
The KeySelectors.java Java example source code
/*
* Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.*;
import java.security.Key;
import java.security.KeyException;
import java.security.PublicKey;
import java.security.cert.*;
import java.util.*;
import javax.crypto.SecretKey;
import javax.xml.crypto.*;
import javax.xml.crypto.dsig.*;
import javax.xml.crypto.dom.*;
import javax.xml.crypto.dsig.keyinfo.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.traversal.*;
import sun.security.util.DerValue;
import sun.security.x509.X500Name;
/**
* This is a class which supplies several KeySelector implementations
*/
class KeySelectors {
/**
* KeySelector which would always return the secret key specified in its
* constructor.
*/
static class SecretKeySelector extends KeySelector {
private SecretKey key;
SecretKeySelector(byte[] bytes) {
key = wrapBytes(bytes);
}
SecretKeySelector(SecretKey key) {
this.key = key;
}
public KeySelectorResult select(KeyInfo ki,
KeySelector.Purpose purpose,
AlgorithmMethod method,
XMLCryptoContext context)
throws KeySelectorException {
return new SimpleKSResult(key);
}
private SecretKey wrapBytes(final byte[] bytes) {
return new SecretKey() {
public String getFormat() {
return "RAW";
}
public String getAlgorithm() {
return "Secret key";
}
public byte[] getEncoded() {
return bytes.clone();
}
};
}
}
/**
* KeySelector which would retrieve the X509Certificate out of the
* KeyInfo element and return the public key.
* NOTE: If there is an X509CRL in the KeyInfo element, then revoked
* certificate will be ignored.
*/
static class RawX509KeySelector extends KeySelector {
public KeySelectorResult select(KeyInfo keyInfo,
KeySelector.Purpose purpose,
AlgorithmMethod method,
XMLCryptoContext context)
throws KeySelectorException {
if (keyInfo == null) {
throw new KeySelectorException("Null KeyInfo object!");
}
// search for X509Data in keyinfo
Iterator iter = keyInfo.getContent().iterator();
while (iter.hasNext()) {
XMLStructure kiType = (XMLStructure) iter.next();
if (kiType instanceof X509Data) {
X509Data xd = (X509Data) kiType;
Object[] entries = xd.getContent().toArray();
X509CRL crl = null;
// Looking for CRL before finding certificates
for (int i = 0; (i<entries.length&&crl != null); i++) {
if (entries[i] instanceof X509CRL) {
crl = (X509CRL) entries[i];
}
}
Iterator xi = xd.getContent().iterator();
boolean hasCRL = false;
while (xi.hasNext()) {
Object o = xi.next();
// skip non-X509Certificate entries
if (o instanceof X509Certificate) {
if ((purpose != KeySelector.Purpose.VERIFY) &&
(crl != null) &&
crl.isRevoked((X509Certificate)o)) {
continue;
} else {
return new SimpleKSResult
(((X509Certificate)o).getPublicKey());
}
}
}
}
}
throw new KeySelectorException("No X509Certificate found!");
}
}
/**
* KeySelector which would retrieve the public key out of the
* KeyValue element and return it.
* NOTE: If the key algorithm doesn't match signature algorithm,
* then the public key will be ignored.
*/
static class KeyValueKeySelector extends KeySelector {
public KeySelectorResult select(KeyInfo keyInfo,
KeySelector.Purpose purpose,
AlgorithmMethod method,
XMLCryptoContext context)
throws KeySelectorException {
if (keyInfo == null) {
throw new KeySelectorException("Null KeyInfo object!");
}
SignatureMethod sm = (SignatureMethod) method;
List list = keyInfo.getContent();
for (int i = 0; i < list.size(); i++) {
XMLStructure xmlStructure = (XMLStructure) list.get(i);
if (xmlStructure instanceof KeyValue) {
PublicKey pk = null;
try {
pk = ((KeyValue)xmlStructure).getPublicKey();
} catch (KeyException ke) {
throw new KeySelectorException(ke);
}
// make sure algorithm is compatible with method
if (algEquals(sm.getAlgorithm(), pk.getAlgorithm())) {
return new SimpleKSResult(pk);
}
}
}
throw new KeySelectorException("No KeyValue element found!");
}
//@@@FIXME: this should also work for key types other than DSA/RSA
static boolean algEquals(String algURI, String algName) {
if (algName.equalsIgnoreCase("DSA") &&
algURI.equals(SignatureMethod.DSA_SHA1)) {
return true;
} else if (algName.equalsIgnoreCase("RSA") &&
(algURI.equals(SignatureMethod.RSA_SHA1) ||
algURI.equals
("http://www.w3.org/2001/04/xmldsig-more#rsa-sha256") ||
algURI.equals
("http://www.w3.org/2001/04/xmldsig-more#rsa-sha384") ||
algURI.equals
("http://www.w3.org/2001/04/xmldsig-more#rsa-sha512"))) {
return true;
} else {
return false;
}
}
}
/**
* KeySelector which would perform special lookup as documented
* by the ie/baltimore/merlin-examples testcases and return the
* matching public key.
*/
static class CollectionKeySelector extends KeySelector {
private CertificateFactory cf;
private File certDir;
private Vector<X509Certificate> certs;
private static final int MATCH_SUBJECT = 0;
private static final int MATCH_ISSUER = 1;
private static final int MATCH_SERIAL = 2;
private static final int MATCH_SUBJECT_KEY_ID = 3;
private static final int MATCH_CERTIFICATE = 4;
CollectionKeySelector(File dir) {
certDir = dir;
try {
cf = CertificateFactory.getInstance("X509");
} catch (CertificateException ex) {
// not going to happen
}
certs = new Vector<X509Certificate>();
File[] files = new File(certDir, "certs").listFiles();
for (int i = 0; i < files.length; i++) {
try (FileInputStream fis = new FileInputStream(files[i])) {
certs.add((X509Certificate)cf.generateCertificate(fis));
} catch (Exception ex) { }
}
}
Vector<X509Certificate> match(int matchType, Object value,
Vector<X509Certificate> pool) {
Vector<X509Certificate> matchResult = new Vector<>();
for (int j=0; j < pool.size(); j++) {
X509Certificate c = pool.get(j);
switch (matchType) {
case MATCH_SUBJECT:
try {
if (c.getSubjectDN().equals(new X500Name((String)value))) {
matchResult.add(c);
}
} catch (IOException ioe) { }
break;
case MATCH_ISSUER:
try {
if (c.getIssuerDN().equals(new X500Name((String)value))) {
matchResult.add(c);
}
} catch (IOException ioe) { }
break;
case MATCH_SERIAL:
if (c.getSerialNumber().equals(value)) {
matchResult.add(c);
}
break;
case MATCH_SUBJECT_KEY_ID:
byte[] extension = c.getExtensionValue("2.5.29.14");
if (extension != null) {
try {
DerValue derValue = new DerValue(extension);
DerValue derValue2 = new DerValue(derValue.getOctetString());
byte[] extVal = derValue2.getOctetString();
if (Arrays.equals(extVal, (byte[]) value)) {
matchResult.add(c);
}
} catch (IOException ex) { }
}
break;
case MATCH_CERTIFICATE:
if (c.equals(value)) {
matchResult.add(c);
}
break;
}
}
return matchResult;
}
public KeySelectorResult select(KeyInfo keyInfo,
KeySelector.Purpose purpose,
AlgorithmMethod method,
XMLCryptoContext context)
throws KeySelectorException {
if (keyInfo == null) {
throw new KeySelectorException("Null KeyInfo object!");
}
Iterator iter = keyInfo.getContent().iterator();
while (iter.hasNext()) {
XMLStructure xmlStructure = (XMLStructure) iter.next();
try {
if (xmlStructure instanceof KeyName) {
String name = ((KeyName)xmlStructure).getName();
PublicKey pk = null;
File certFile = new File(new File(certDir, "certs"),
name.toLowerCase() + ".crt");
try (FileInputStream fis = new FileInputStream(certFile)) {
// Lookup the public key using the key name 'Xxx',
// i.e. the public key is in "certs/xxx.crt".
X509Certificate cert = (X509Certificate)
cf.generateCertificate(fis);
pk = cert.getPublicKey();
} catch (FileNotFoundException e) {
// assume KeyName contains subject DN and search
// collection of certs for match
Vector<X509Certificate> result =
match(MATCH_SUBJECT, name, certs);
int numOfMatches = (result==null? 0:result.size());
if (numOfMatches != 1) {
throw new KeySelectorException
((numOfMatches==0?"No":"More than one") +
" match found");
}
pk = result.get(0).getPublicKey();
}
return new SimpleKSResult(pk);
} else if (xmlStructure instanceof RetrievalMethod) {
// Lookup the public key using the retrievel method.
// NOTE: only X509Certificate type is supported.
RetrievalMethod rm = (RetrievalMethod) xmlStructure;
String type = rm.getType();
if (type.equals(X509Data.RAW_X509_CERTIFICATE_TYPE)) {
String uri = rm.getURI();
try (FileInputStream fis =
new FileInputStream(new File(certDir, uri))) {
X509Certificate cert = (X509Certificate)
cf.generateCertificate(fis);
return new SimpleKSResult(cert.getPublicKey());
}
} else {
throw new KeySelectorException
("Unsupported RetrievalMethod type");
}
} else if (xmlStructure instanceof X509Data) {
List content = ((X509Data)xmlStructure).getContent();
int size = content.size();
Vector<X509Certificate> result = null;
// Lookup the public key using the information
// specified in X509Data element, i.e. searching
// over the collection of certificate files under
// "certs" subdirectory and return those match.
for (int k = 0; k<size; k++) {
Object obj = content.get(k);
if (obj instanceof String) {
result = match(MATCH_SUBJECT, obj, certs);
} else if (obj instanceof byte[]) {
result = match(MATCH_SUBJECT_KEY_ID, obj,
certs);
} else if (obj instanceof X509Certificate) {
result = match(MATCH_CERTIFICATE, obj, certs);
} else if (obj instanceof X509IssuerSerial) {
X509IssuerSerial is = (X509IssuerSerial) obj;
result = match(MATCH_SERIAL,
is.getSerialNumber(), certs);
result = match(MATCH_ISSUER,
is.getIssuerName(), result);
} else {
throw new KeySelectorException("Unsupported X509Data: " + obj);
}
}
int numOfMatches = (result==null? 0:result.size());
if (numOfMatches != 1) {
throw new KeySelectorException
((numOfMatches==0?"No":"More than one") +
" match found");
}
return new SimpleKSResult(result.get(0).getPublicKey());
}
} catch (Exception ex) {
throw new KeySelectorException(ex);
}
}
throw new KeySelectorException("No matching key found!");
}
}
static class ByteUtil {
private static String mapping = "0123456789ABCDEF";
private static int numBytesPerRow = 6;
private static String getHex(byte value) {
int low = value & 0x0f;
int high = ((value >> 4) & 0x0f);
char[] res = new char[2];
res[0] = mapping.charAt(high);
res[1] = mapping.charAt(low);
return new String(res);
}
static String dumpArray(byte[] in) {
int numDumped = 0;
StringBuffer buf = new StringBuffer(512);
buf.append("{");
for (int i=0;i<(in.length/numBytesPerRow); i++) {
for (int j=0; j<(numBytesPerRow); j++) {
buf.append("(byte)0x" + getHex(in[i*numBytesPerRow+j]) +
", ");
}
numDumped += numBytesPerRow;
}
while (numDumped < in.length) {
buf.append("(byte)0x" + getHex(in[numDumped]) + " ");
numDumped += 1;
}
buf.append("}");
return buf.toString();
}
}
}
class SimpleKSResult implements KeySelectorResult {
private final Key key;
SimpleKSResult(Key key) { this.key = key; }
public Key getKey() { return key; }
}
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