Java 如何使用文件系统中的.cer文件验证时间戳令牌？

TimeStampToken类（bctsp-jdk16-1.46.jar）中有两个验证方法，其中一个已弃用

不推荐使用的方法使用X509Certificate作为参数，这很容易创建

InputStream inPFX = getClass().getClassLoader().getResourceAsStream("tsp.cer");
CertificateFactory cf = CertificateFactory.getInstance("X.509", "BC");
X509Certificate cert = (X509Certificate) cf.generateCertificate(inPFX);

// The validate method just takes the X509Certificate object
token.validate(cert, "BC");

新方法使用SignerInformationVerifier对象。我找到了一种创建SignerInformationVerifier的方法（不确定是否正确），但我仍然需要一个X509CertificateHolder对象

• 如何从文件系统（*.cer文件）上的文件创建X509CertificateHolder
• 这是创建SignerInformationVerifier以验证TimeStampToken的正确方法吗

我当前的代码如下所示：

TimeStampToken token = new TimeStampToken(new CMSSignedData(response));

X509CertificateHolder x = // HOW TODO THIS?

// create the SignerInformationVerifier object
DigestAlgorithmIdentifierFinder daif = new DefaultDigestAlgorithmIdentifierFinder();
DigestCalculatorProvider dcp = new BcDigestCalculatorProvider();
SignerInformationVerifier siv = new BcRSASignerInfoVerifierBuilder(daif, dcp).build(x509ch);

// use the new validate method
token.validate(siv);

试试这个

TimeStampToken token = new TimeStampToken(new CMSSignedData(response));

InputStream in = new FileInputStream("tsp.cer");
CertificateFactory factory = CertificateFactory.getInstance("X.509");

X509Certificate cert = (X509Certificate) factory.generateCertificate(in);

//RSA Signature processing with BC
X509CertificateHolder holder = new X509CertificateHolder(cert.getEncoded());
SignerInformationVerifier siv = new BcRSASignerInfoVerifierBuilder(new DefaultDigestAlgorithmIdentifierFinder(), new BcDigestCalculatorProvider()).build(holder);

//Signature processing with JCA and other provider
//X509CertificateHolder holderJca = new JcaX509CertificateHolder(cert);
//SignerInformationVerifier sivJca = new JcaSimpleSignerInfoVerifierBuilder().setProvider("anotherprovider").build(holderJca);

token.validate(siv);

查看文档的验证签名信息对象部分，了解有关使用BC API进行签名验证的更多信息

您正在以正确的方式创建签名信息验证程序，您可以在示例代码中找到另一种为基于JCA/JCE提供程序的解决方案创建签名信息验证程序的方法