将证书添加到 CMS 签名数据

Question

我目前正在使用 java Bouncy Castle 库来创建 CMS 签名数据（或 PKCS7 签名数据）。然而，我似乎无法添加证书（即使证书签名者已正确添加）。

我查看了 this question 关于正确签署数据的信息，但它没有响应我的 SCEP 服务器的需求。我使用的代码来自 EJBCA，但似乎没有将证书添加到 PKCS7 签名数据中。

当我使用openssl cms 工具解析签名数据时，我看到“证书”字段为“空”。此外，当我尝试使用openssl pkcs7 [...] -print_certs 打印证书时，我什么也得不到。

这是我使用 Bouncy Castle 签署数据的方式（代码很多，但足以重现问题）：

CMSEnvelopedDataGenerator edGen = new CMSEnvelopedDataGenerator();
CMSTypedData msg;
List<X509Certificate> certList = new ArrayList<>();
// Make sure the certificate is not null
if (this.certificate != null) {
    certList.add((X509Certificate) this.certificate);
}

/**
* Create the signed CMS message to be contained inside the envelope
* this message does not contain any message, and no signerInfo
**/
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
Collection<JcaX509CertificateHolder> x509CertificateHolder = new ArrayList<>();
try {
    for (X509Certificate certificate : certList) {
        x509CertificateHolder.add(new JcaX509CertificateHolder(certificate));
    }
    CollectionStore<JcaX509CertificateHolder> store = new CollectionStore<>(x509CertificateHolder);
    gen.addCertificates(store);
} catch (Handle all exceptions) {}

上面这段代码的 sn-p 通常应该添加证书。这是我从 EJBCA 拿来的。

这是我完成签名数据的方式：

CMSSignedDataGenerator gen1 = new CMSSignedDataGenerator();
// I add ALL of my attributes here
// Once they're added...
Certificate caCert = this.caCertificate;
try {
    String provider = BouncyCastleProvider.PROVIDER_NAME;
    ContentSigner contentSigner = new JcaContentSignerBuilder(signatureAlgorithmName).
            setProvider(provider).
            build(signerKey);
    JcaDigestCalculatorProviderBuilder calculatorProviderBuilder = new JcaDigestCalculatorProviderBuilder().
            setProvider(provider);
    JcaSignerInfoGeneratorBuilder builder = new JcaSignerInfoGeneratorBuilder(calculatorProviderBuilder.build());
    builder.setSignedAttributeGenerator(new DefaultSignedAttributeTableGenerator(new AttributeTable(attributes)));
    gen1.addSignerInfoGenerator(builder.build(contentSigner, (X509Certificate) ca));
} catch (Handle all exceptions) {}

// Create the signed data
CMSSignedData sd = gen1.generate(msg, true);
byte[] results = sd.getEncoded();

字节数组结果是 DER 格式的 PKCS7 签名数据...但没有添加证书。

我错过了什么吗？感谢您的帮助！

Answer 1

CMSSignedDataGenerator gen1 必须明确添加我不知道的证书。

可以通过以下方式完成：

• 将证书添加到List 或X509Certificates；
• 将List 转换为Collection 的JcaX509CertificateHolder；
• 将此集合添加到CollectionStore 或JcaX509CertificateHolder；
• 添加商店CMSSignedDataGenerator。

代码示例：

 CMSSignedDataGenerator gen1 = new CMSSignedDataGenerator();
 List<X509Certificate> certificates = new ArrayList<>();

 // I chose to add the CA certificate
 certificates.add((X509Certificate) this.caCertificate);

 // In this case, this is a certificate that I need to add
 if (this.certificate != null)
     certificates.add((X509Certificate) this.certificate);

 // This is the recipient certificate
 if (this.recipientCert != null)
     certificates.add((X509Certificate) this.recipientCert);
 Collection<JcaX509CertificateHolder> x509CertificateHolder = new ArrayList<>();

 // Of course, we need to handle the exceptions...
 for (X509Certificate certificate : certificates) {
     x509CertificateHolder.add(new JcaX509CertificateHolder(certificate));
 }
 CollectionStore<JcaX509CertificateHolder> store = new CollectionStore<>(x509CertificateHolder);

// The final stage.
 gen1.addCertificates(store);

希望这对将来的任何人都有帮助。