Question

数字签名的长度是否取决于数字令牌（数字证书）？我正在使用以下代码生成数字签名，并且数字签名的长度因证书而异。长度对于所有证书都是唯一的，还是取决于证书？我正在使用ePass数字令牌。

 Security.addProvider(new BouncyCastleProvider());
                                        try {
                                            Signature signature = Signature.getInstance(DIGEST_SHA1);
                                            signature.initSign(privateKey);
                                            signature.update("abc".getBytes("UTF-8"));

                                        //  X509Certificate certFromKeystore = (X509Certificate) ks.getCertificate(signName);
                                            X509Certificate certFromKeystore = x509CertificateToSign;
                                            // System.out.println(alias+"***"+certFromKeystore.toString());
                                            List certList = new ArrayList();
                                            CMSTypedData data = new CMSProcessableByteArray("abc".getBytes());
                                            certList.add(certFromKeystore);
                                            Store certs = new JcaCertStore(certList);
                                            CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
                                            ContentSigner sha1Signer = new JcaContentSignerBuilder(DIGEST_SHA1)
                                                    .setProvider("SunMSCAPI").build(privateKey);
                                            gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(
                                                    new JcaDigestCalculatorProviderBuilder().setProvider(BC_PROVIDER).build())
                                                            .build(sha1Signer, certFromKeystore));
                                            gen.addCertificates(certs);
                                            CMSSignedData signedData = gen.generate(data, false);
                                            BASE64Encoder encoder = new BASE64Encoder();
                                            String signedContent = encoder.encode((byte[]) signedData.getSignedContent().getContent());
                                            System.out.println(
                                                    "=============Signed content:=============" + "\n" + signedContent + "\n");
                                            String envelopedData = encoder.encode(signedData.getEncoded());
                                            System.out.println("==============Enveloped data===============" + "\n"
                                                    + envelopedData + "==" + envelopedData.length());

Answer 1

这取决于您使用的数字签名格式。

基本签名容器（即PKCS＃1）仅包含签名的哈希。高级格式也可以包括证书本身或对证书的引用。

在您的情况下，CMS中包含证书，因此每个证书的结果大小都会不同

数字签名的长度是否取决于数字令牌（数字证书）？

1 个答案: