从 Apache SantuarioCreateSignature
示例构建,我能想到的最短的就是这个。没有 themain()
和它的伴随output()
,它是 20 行
import java.io.*;
import java.security.Key;
import java.security.KeyStore;
import java.security.cert.X509Certificate;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.commons.io.IOUtils;
import org.apache.xml.security.Init;
import org.apache.xml.security.c14n.Canonicalizer;
import org.apache.xml.security.signature.XMLSignature;
import org.apache.xml.security.transforms.Transforms;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.ElementProxy;
import org.w3c.dom.Document;
public class CreateSignature {
private static final String PRIVATE_KEY_ALIAS = "test-alias";
private static final String PRIVATE_KEY_PASS = "test";
private static final String KEY_STORE_PASS = "test";
private static final String KEY_STORE_TYPE = "JKS";
public static void main(String... unused) throws Exception {
final InputStream fileInputStream = new FileInputStream("test.xml");
try {
output(signFile(fileInputStream, new File("keystore.jks")), "signed-test.xml");
}
finally {
IOUtils.closeQuietly(fileInputStream);
}
}
public static ByteArrayOutputStream signFile(InputStream xmlFile, File privateKeyFile) throws Exception {
final Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmlFile);
Init.init();
ElementProxy.setDefaultPrefix(Constants.SignatureSpecNS, "");
final KeyStore keyStore = loadKeyStore(privateKeyFile);
final XMLSignature sig = new XMLSignature(doc, null, XMLSignature.ALGO_ID_SIGNATURE_RSA);
final Transforms transforms = new Transforms(doc);
transforms.addTransform(Transforms.TRANSFORM_ENVELOPED_SIGNATURE);
sig.addDocument("", transforms, Constants.ALGO_ID_DIGEST_SHA1);
final Key privateKey = keyStore.getKey(PRIVATE_KEY_ALIAS, PRIVATE_KEY_PASS.toCharArray());
final X509Certificate cert = (X509Certificate)keyStore.getCertificate(PRIVATE_KEY_ALIAS);
sig.addKeyInfo(cert);
sig.addKeyInfo(cert.getPublicKey());
sig.sign(privateKey);
doc.getDocumentElement().appendChild(sig.getElement());
final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
outputStream.write(Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_WITH_COMMENTS).canonicalizeSubtree(doc));
return outputStream;
}
private static KeyStore loadKeyStore(File privateKeyFile) throws Exception {
final InputStream fileInputStream = new FileInputStream(privateKeyFile);
try {
final KeyStore keyStore = KeyStore.getInstance(KEY_STORE_TYPE);
keyStore.load(fileInputStream, KEY_STORE_PASS.toCharArray());
return keyStore;
}
finally {
IOUtils.closeQuietly(fileInputStream);
}
}
private static void output(ByteArrayOutputStream signedOutputStream, String fileName) throws IOException {
final OutputStream fileOutputStream = new FileOutputStream(fileName);
try {
fileOutputStream.write(signedOutputStream.toByteArray());
fileOutputStream.flush();
}
finally {
IOUtils.closeQuietly(fileOutputStream);
}
}
}