如何利用PKCS 7和SHA算法在C#中创建数字签名并进行验证

Question

我试图对xml文档进行数字签名，并使用带有公钥和签名文档的原始xml文件验证签名。我有一个可引用的java代码。我需要将java代码转换为C#，这里有如下的java代码：

   certList = new ArrayList<X509Certificate>();
   certList.add(signerCert);
   certStore = new JcaCertStore(certList);
   signedDataGenerator = new CMSSignedDataGenerator();
   ContentSigner sha2Signer = new JcaContentSignerBuilder("SHA512with" + privateKey.getAlgorithm()).build(privateKey);

   ignedDataGenerator.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().build()).setDirectSignature(true).build(sha2Signer, signerCert));
   signedDataGenerator.addCertificates(certStore);
   CMSSignedData sigData = signedDataGenerator.generate(new CMSProcessableFile(inputXmlFile), false);
   signedBytes = sigData.getEncoded();

我已经将java代码转换为C#，如下所示：

        X509Store my = new X509Store(StoreName.My, StoreLocation.LocalMachine);
        my.Open(OpenFlags.ReadOnly);
        // Find the certificate we’ll use to sign
        RSACryptoServiceProvider csp = null;
        foreach (X509Certificate2 cert in my.Certificates)
        {
            if (cert.Subject.Contains(certSubject))
            {
                // We found it.
                // Get its associated CSP and private key
                csp = (RSACryptoServiceProvider)cert.PrivateKey;                  
            }
        }
        if (csp == null)
        {
            throw new Exception("oppose no valid application was found");
        }
        // Hash the data
        SHA512Managed sha1 = new SHA512Managed();
        UnicodeEncoding encoding = new UnicodeEncoding();
        byte[] data = encoding.GetBytes(text);
        byte[] hash = sha1.ComputeHash(data);
        // Sign the hash
        return csp.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"));

我试图转换它从两天，它是生成符号字节数组，但无法验证。在验证它正在抛出坏散列\r\n错误时，我将非常感谢您的任何帮助。我知道我在将java代码转换为C#方面有些错误。我能够验证代码，但无法对文档签名。

Answer 1

我使用这样的System.Security.Cryptography.Pkcs库生成了签名

    public static byte[] Sign(byte[] data, X509Certificate2 certificate)
    {
        if (data == null)
            throw new ArgumentNullException("data");
        if (certificate == null)
            throw new ArgumentNullException("certificate");

        // setup the data to sign
        ContentInfo content = new ContentInfo(data);
        SignedCms signedCms = new SignedCms(content, false);
        CmsSigner signer = new CmsSigner(SubjectIdentifierType.IssuerAndSerialNumber, certificate);
        // create the signature
        signedCms.ComputeSignature(signer);
        return signedCms.Encode();
    }

然后像这样验证签名

  private static bool VerifySignatures(FileInfo contentFile, Stream signedDataStream)
    {
        CmsProcessable signedContent = null;
        CmsSignedData cmsSignedData = null;
        Org.BouncyCastle.X509.Store.IX509Store store = null;
        ICollection signers = null;
        bool verifiedStatus = false;
        try
        {
            //Org.BouncyCastle.Security.addProvider(new BouncyCastleProvider());
            signedContent = new CmsProcessableFile(contentFile);
            cmsSignedData = new CmsSignedData(signedContent, signedDataStream);
            store = cmsSignedData.GetCertificates("Collection");//.getCertificates();
            IX509Store certStore = cmsSignedData.GetCertificates("Collection");
            signers = cmsSignedData.GetSignerInfos().GetSigners();
            foreach (var item in signers)
            {
                SignerInformation signer = (SignerInformation)item;
                var certCollection = certStore.GetMatches(signer.SignerID);
                IEnumerator iter = certCollection.GetEnumerator();
                iter.MoveNext();
                var cert = (Org.BouncyCastle.X509.X509Certificate)iter.Current;
                verifiedStatus = signer.Verify(cert.GetPublicKey());
            }

        }
        catch (Exception e)
        {
            throw e;
        }

        return verifiedStatus;
    }

对我来说很管用