Question

我正在尝试创建一个证书（A），该证书针对存储在p12密钥库中的其他证书（B）进行了签名。此存储的证书（B）已添加到我的本地计算机的受信任证书存储中。

证书A用于使用充气城堡1.52库对pdf文档进行签名，但是我在签名文档中获得的数字签名无效。

我将解释已完成的步骤，只要有人可以帮助我。

首先，我从p12密钥库（B）创建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生成了一个证书（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，我使用生成的证书（A）对我的pdf签名。

        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();

所有过程显然执行正确，但是当我打开pdf时，签名无效：

编辑：我已经导出了生成的证书。这是获得的结果。

我将感谢您提供任何可帮助我解决此问题的评论或信息。

谢谢。

Answer 1

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

如果我认为正确，则说明您正在使用CA的私钥对数据进行签名。它应该是证书的。因此，私钥和公钥不匹配，因此签名验证检查失败。

Answer 2

我已经确定了问题：我正在按照相反的顺序构建证书链。

我有这个命令：

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

正确的顺序是这样：

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

我希望有人可以找到有用的信息！

Bouncy Castle：与现有CA签署的证书

2 个答案: