Bouncy Castle：使用现有 CA 签名的证书

Question

我正在尝试创建一个证书 (A)，该证书已为存储在 p12 密钥库中的其他证书 (B) 签名。此存储的证书 (B) 已添加到我本地计算机的受信任证书存储区。

证书A用于使用bouncy castle 1.52库对pdf文档进行签名，但我在签名文档中获取的数字签名无效。

如果有人能帮助我，我将解释完成的步骤。

首先，我从 p12 密钥库 (B) 创建一个 CSR：

    private static PKCS10CertificationRequest generateCSR() {
    PKCS10CertificationRequest csr = null;
    try {
        initCACert();
        PKCS10CertificationRequestBuilder p10Builder = new JcaPKCS10CertificationRequestBuilder(
                new X500Principal("CN=Requested Test Certificate"), CAcert.getPublicKey());
        JcaContentSignerBuilder csBuilder = new JcaContentSignerBuilder("SHA256withRSA");
        ContentSigner signer = csBuilder.build(CApk);
        csr = p10Builder.build(signer);
    } catch (Exception e) {
        log.error(e);
    }
    return csr;
}

然后，使用此 CSR 生成证书 (A)。

    private static Certificate signCSR() throws Exception { 
    PKCS10CertificationRequest csr = generateCSR();

    AlgorithmIdentifier sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find("SHA256withRSA");
    AlgorithmIdentifier digAlgId = new DefaultDigestAlgorithmIdentifierFinder().find(sigAlgId);

    X500Name issuer = X500Name.getInstance(CAcert.getSubjectX500Principal().getEncoded());

    BigInteger serial = new BigInteger(32, new SecureRandom());
    Calendar c = Calendar.getInstance();
    c.add(Calendar.SECOND, -1);
    Date from = c.getTime();
    c.add(Calendar.YEAR, 5);
    Date to = c.getTime();

    X509v1CertificateBuilder certBuilder = new X509v1CertificateBuilder(issuer, serial, from, to, csr.getSubject(),
            csr.getSubjectPublicKeyInfo());

    ContentSigner signer = new BcRSAContentSignerBuilder(sigAlgId, digAlgId)
            .build(PrivateKeyFactory.createKey(CApk.getEncoded()));
    X509CertificateHolder holder = certBuilder.build(signer);

    CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
    InputStream in = new ByteArrayInputStream(holder.getEncoded());
    Certificate cert = certFactory.generateCertificate(in);

    return cert;
}

最后，我使用这个生成的证书 (A) 来签署我的 pdf。

        Certificate cert = signCSR();

        SignerInfoGeneratorBuilder signerInfoBuilder = new SignerInfoGeneratorBuilder(
                    new JcaDigestCalculatorProviderBuilder().setProvider("BC").build()
                    );
        signerInfoBuilder.setSignedAttributeGenerator( signedAttributeGenerator );

        JcaContentSignerBuilder contentSignerBuilder = new JcaContentSignerBuilder( "SHA1WITHRSA" );
        contentSignerBuilder.setProvider("BC");


        X509CertificateHolder certificateHolder = new X509CertificateHolder( cert.getEncoded( ) );

        generator.addSignerInfoGenerator(
                signerInfoBuilder.build( contentSignerBuilder.build( CApk ),
                        certificateHolder ) 
                );

        ArrayList<X509CertificateHolder> signingChainHolder = new ArrayList<X509CertificateHolder>( );
        certificateHolder = new X509CertificateHolder( cert.getEncoded() );
        certificateHolder = new X509CertificateHolder( CAcert.getEncoded() );

        signingChainHolder.add( certificateHolder );

        Store certs = new JcaCertStore( signingChainHolder );
        generator.addCertificates( certs );

        CMSTypedData content = new CMSProcessableByteArray(datos);

        CMSSignedData signedData = generator.generate( content, true );
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        new DEROutputStream(baos).writeObject(signedData.toASN1Structure());
        result = baos.toByteArray();

所有的过程显然都执行正确，但是当我打开pdf时签名无效：

编辑：我导出了生成的证书。这是得到的结果。

如果有任何评论或信息可以帮助我解决此问题，我将不胜感激。

提前致谢。

Answer 1

    generator.addSignerInfoGenerator(
            signerInfoBuilder.build( contentSignerBuilder.build( CApk ),
                    certificateHolder ) 
            );

如果我没看错，您正在使用 CA 的私钥对数据进行签名。应该是证书的。因此私钥和 public 密钥不匹配，因此签名验证检查失败。

Answer 2

我发现了问题：我以相反的顺序构建证书链。

我有这个订单：

 certificateHolder = new X509CertificateHolder( cert.getEncoded() );
 certificateHolder = new X509CertificateHolder( CAcert.getEncoded() );

正确的顺序是：

certificateHolder = new X509CertificateHolder( CAcert.getEncoded() );
certificateHolder = new X509CertificateHolder( cert.getEncoded() );

我希望有人能找到有用的信息！

Bouncy Castle：使用现有 CA 签名的证书

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