如何验证已签名的 jar 是否包含时间戳？

从 https://blogs.oracle.com/mullan/entry/how_to_determine_if_a：

您可以使用 jarsigner 实用程序来确定已签名的 JAR 是否已按如下方式加盖时间戳：

jarsigner -verify -verbose -certs signed.jar

其中 是已签名的 JAR 的名称。如果带有时间戳，则输出将包含以下行，指示其签名时间：signed.jar

[entry was signed on 8/2/13 3:48 PM]

如果 JAR 没有时间戳，则输出将不包括这些行。

只是花了最后2个小时寻找这个问题，终于找到了一种方法来识别jar文件是否确实包含签名块文件中的时间戳信息。我可以在 /META-INF/FOO 的十六进制编辑器中看到 GlobalSign certifcate。DSA文件，但我没有找到任何可以打印出您需要的信息的工具。

您可以重命名 FOO。DSA 文件到 foo.p7b 以在 Windows CertMgr 中打开它，但它也不显示任何时间戳信息。我也没有设法使用OpenSSL来验证DSA文件（它是PKCS#7文件格式）。

因此，我想出了以下代码，它将显示时间戳 SignerInfo 和创建时间戳的日期。我希望这对你来说是一个良好的开端。在类路径中需要 bcprov-jdk16-144.jar、bctsp-jdk16-144.jar 和 bcmail-jdk16-144.jar。从弹跳城堡获取它们

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;
        }
    }
}