在对一个jar文件进行签名并使用了-tsa选项之后，如何验证时间戳已经被包含？我尝试过：
jarsigner -verify -verbose -certs myApp.jar
但输出没有指定时间戳的任何信息。我之所以问这个问题，是因为即使我在-tsa URL路径中有错别字，jarsigner 也会成功。这是GlobalSign TSA URL：http://timestamp.globalsign.com/scripts/timstamp.dll，位于其后面的服务器显然接受任何路径（例如timestamp.globalsign.com/foobar），因此最终我不确定我的jar文件是否已经打上了时间戳。
从 https://blogs.oracle.com/mullan/entry/how_to_determine_if_a：
您可以使用jarsigner工具来确定已签名的JAR是否已被时间戳标记，方法如下:
jarsigner -verify -verbose -certs signed.jar其中，
signed.jar是您签署的JAR文件的名称。如果已经进行了时间戳标记，则输出将包括以下行，指示签名时间：
[entry was signed on 8/2/13 3:48 PM]如果未对JAR文件进行时间戳标记，则输出将不包含这些行。
我刚刚花了最近2个小时来寻找一个问题的答案，最终找到了一种方式来确认一个jar文件是否有在签名块文件中包含时间戳信息。我可以在/META-INF/FOO.DSA文件的十六进制编辑器中看到GlobalSign证书，但我没有找到任何可以打印所需信息的工具。
你可以将FOO.DSA文件重命名为foo.p7b并在Windows CertMgr中打开它，但是它也不显示任何时间戳信息。我也无法使用OpenSSL验证DSA文件（它是PKCS#7文件格式）。
因此，我编写了以下代码，将显示时间戳签名者信息和时间戳创建日期。希望对你有所帮助。你需要在类路径中获取bcprov-jdk16-144.jar、bctsp-jdk16-144.jar和bcmail-jdk16-144.jar。从Bouncycastle获取它们。
package de.mhaller.bouncycastle;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.Security;
import java.util.Collection;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerId;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.tsp.TSPException;
import org.bouncycastle.tsp.TimeStampToken;
import org.bouncycastle.tsp.TimeStampTokenInfo;
public class VerifyTimestampSignature {
private static boolean found;
public static void main(String[] args) throws Exception {
if (args == null || args.length != 1) {
System.out.println("usage: java " + VerifyTimestampSignature.class.getName()
+ " [jar-file|dsa-file]");
return;
}
BouncyCastleProvider provider = new BouncyCastleProvider();
Security.addProvider(provider);
String filename = args[0];
if (filename.toLowerCase().endsWith(".dsa")) {
InputStream dsa = new FileInputStream(filename);
printDSAInfos(filename, dsa);
return;
}
if (filename.toLowerCase().endsWith(".jar")) {
InputStream jar = new FileInputStream(filename);
JarInputStream jarInputStream = new JarInputStream(jar);
JarEntry nextJarEntry;
do {
nextJarEntry = jarInputStream.getNextJarEntry();
if (nextJarEntry == null) {
break;
}
if (nextJarEntry.getName().toLowerCase().endsWith(".dsa")) {
printDSAInfos(nextJarEntry.getName(), jarInputStream);
}
} while (nextJarEntry != null);
}
if (!found) {
System.out.println("No certificate with time stamp information found in " + filename);
} else {
System.out.println("Found at least one time stamp info");
System.out.println("Note: But it was NOT verified for validity!");
}
}
private static void printDSAInfos(String file, InputStream dsa) throws CMSException,
IOException, TSPException {
System.out.println("Retrieving time stamp token from: " + file);
CMSSignedData signature = new CMSSignedData(dsa);
SignerInformationStore store = signature.getSignerInfos();
Collection<?> signers = store.getSigners();
for (Object object : signers) {
SignerInformation signerInform = (SignerInformation) object;
AttributeTable attrs = signerInform.getUnsignedAttributes();
if (attrs == null) {
System.err
.println("Signer Information does not contain any unsigned attributes. A signed jar file with Timestamp information should contain unsigned attributes.");
continue;
}
Attribute attribute = attrs.get(PKCSObjectIdentifiers.id_aa_signatureTimeStampToken);
DEREncodable dob = attribute.getAttrValues().getObjectAt(0);
CMSSignedData signedData = new CMSSignedData(dob.getDERObject().getEncoded());
TimeStampToken tst = new TimeStampToken(signedData);
SignerId signerId = tst.getSID();
System.out.println("Signer: " + signerId.toString());
TimeStampTokenInfo tstInfo = tst.getTimeStampInfo();
System.out.println("Timestamp generated: " + tstInfo.getGenTime());
found = true;
}
}
}
Java的 keytool 可以确认签名的JAR是否有时间戳，并且可以显示TSA的证书：
$ keytool -printcert -jarfile myApp.jar
...
Timestamp:
Owner: CN=GeoTrust Timestamping Signer 1, O=GeoTrust Inc, C=US
Issuer: CN=Thawte Timestamping CA, OU=Thawte Certification, O=Thawte, L=Durbanville, ST=Western Cape, C=ZA
Serial number: 5e8d2daca44665546bb587978191a8bf
Valid from: Wed Oct 31 00:00:00 GMT 2007 until: Mon Oct 30 23:59:59 GMT 2017
Certificate fingerprints:
MD5: E5:30:07:8E:91:8D:A0:6C:18:6D:91:2A:B6:D2:3A:56
SHA1: 22:3C:DA:27:07:96:73:81:6B:60:8A:1B:8C:B0:AB:02:30:10:7F:CC
SHA256: D7:B8:44:BD:39:5A:17:36:02:39:51:C6:4D:6C:81:65:45:93:AD:29:1D:DC:E4:6C:8D:79:B6:65:DF:31:0C:F6
Signature algorithm name: SHA1withRSA
Version: 3
...
mhaller提供了很棒的代码（printDSAInfos）。在我的工作中帮助了我很多。然而需要进行一些更改。 DEREncodable类现在已经更改为ASN1Encodable，getDERObject()方法已更改为toASN1Primitive。因此，代码看起来像这样：
ASN1Encodable dob = attribute.getAttrValues().getObjectAt(0);
CMSSignedData signedData = new CMSSignedData(dob.toASN1Primitive().getEncoded());