Question

我在使用BouncyCastle 1.59 签名/使用CADES签名时遇到问题。我必须添加messageDigest属性，但是当我添加它时，我的程序将失败。

这是我的代码：

Signature signature = Signature.getInstance("SHA256withRSA", new BouncyCastleProvider());
byte[] test_data = "test".getBytes();
MessageDigest dig = MessageDigest.getInstance("SHA256", new BouncyCastleProvider());
byte[] digest = dig.digest(test_data);

byte[] privateKeyContent = archivePrivateKey.getBytes();
BufferedReader br = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(privateKeyContent)));
Security.addProvider(new BouncyCastleProvider());
PEMParser pp = new PEMParser(br);
PEMKeyPair pemKeyPair = (PEMKeyPair) pp.readObject();
KeyPair kp = new JcaPEMKeyConverter().getKeyPair(pemKeyPair);
pp.close();

signature.initSign(kp.getPrivate());
signature.update(test_data);

byte[] certContent = archiveCertificateContent.getBytes();
PemFile pemFile = new PemFile(certContent);
X509CertificateHolder cert = new X509CertificateHolder(pemFile.getPemObject().getContent());
X509Certificate certificate = new JcaX509CertificateConverter().getCertificate(cert);

// Build CMS
List certList = new ArrayList();
CMSTypedData data = new CMSProcessableByteArray(signature.sign());
certList.add(certificate);
Store certs = new JcaCertStore(certList);


byte[] certHash = dig.digest(certificate.getEncoded());
AlgorithmIdentifier algId = new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256);
ESSCertIDv2 essCert = new ESSCertIDv2(algId, certHash);
SigningCertificateV2 scv2 = new SigningCertificateV2(new ESSCertIDv2[] { essCert });

ASN1EncodableVector signedAttributes = new ASN1EncodableVector();
signedAttributes.add(new Attribute(PKCSObjectIdentifiers.id_aa_signingCertificateV2, new DERSet(scv2)));
//signedAttributes.add(new Attribute(CMSAttributes.messageDigest, new DERSet(new DEROctetString(digest))));
signedAttributes.add(new Attribute(CMSAttributes.contentType, new DERSet(PKCSObjectIdentifiers.data)));

AttributeTable signedAttributesTable = new AttributeTable(signedAttributes);
signedAttributesTable.toASN1EncodableVector();

CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
JcaContentSignerBuilder contentSigner = new JcaContentSignerBuilder("SHA256withRSA");
contentSigner.setProvider(BC_PROVIDER);
SignerInfoGeneratorBuilder signerInfoBuilder = new SignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider(BC_PROVIDER).build());
signerInfoBuilder.setSignedAttributeGenerator(new DefaultSignedAttributeTableGenerator(signedAttributesTable));

gen.addSignerInfoGenerator(signerInfoBuilder.build(contentSigner.build(kp.getPrivate()), cert));
gen.addCertificates(certs);
CMSSignedData signedData = gen.generate(data, true);

// Verify signature
Store store = signedData.getCertificates();
SignerInformationStore signers = signedData.getSignerInfos();
Collection c = signers.getSigners();
Iterator it = c.iterator();
while (it.hasNext()) {
  SignerInformation signer = (SignerInformation) it.next();
  Collection certCollection = store.getMatches(signer.getSID());
  Iterator certIt = certCollection.iterator();
  X509CertificateHolder certHolder = (X509CertificateHolder) certIt.next();
  X509Certificate certFromSignedData = new JcaX509CertificateConverter().setProvider(BC_PROVIDER).getCertificate(certHolder);
  if (signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider(BC_PROVIDER).build(certFromSignedData))) {
    System.out.println("Signature verified");
  } else {
    System.out.println("Signature verification failed");
  }
}

当我取消注释第35行：signedAttributes.add(new Attribute(CMSAttributes.messageDigest, new DERSet(new DEROctetString(digest))));时，我得到了错误：

org.bouncycastle.cms.CMSSignerDigestMismatchException：消息摘要属性值与计算值不匹配

我尝试了很多选项，配置，但问题仍然存在。任何帮助将非常有用。谢谢

Answer 1

我还没有亲自尝试过您的代码，但是我认为问题在于您添加的消息摘要，因为MessageDigest属性并不是您真正放入SignedData中的属性。我看到您首先使用JCA对数据进行签名。

Signature signature = Signature.getInstance("SHA256withRSA", new BouncyCastleProvider());
byte[] test_data = "test".getBytes();
    signature.initSign(kp.getPrivate());
signature.update(test_data);
CMSTypedData data = new CMSProcessableByteArray(signature.sign());
...
CMSSignedData signedData = gen.generate(data, true);

在这里放置签名（而不是奇怪的数据）来生成CMSSignedData。因此，对于contentSigner，您的签名是要签名的实际数据。但是，在MessageDigest属性中，您要放入实际数据的摘要。这很可能是造成问题的原因。

现在要提出更重要的问题。为什么首先要使用上述代码对数据进行签名？这对我来说似乎是错误的，可能不是您想要的。如果您的目的是为“测试”数据生成CMS signedData，则应直接在signedDataGenerator中使用它，这将处理签名部分。

如果尚未完成，请通过RFC。

希望这会有所帮助。

BouncyCastle属性messageDigest失败验证

1 个答案: