在Java中验证Bouncy Castle的pkcs7 SignedData

时间:2015-12-10 09:14:13

标签: java c# validation pkcs#7

我正在使用Java实现C#SignedCms功能。

我有一个pkcs7 SignedData (请参阅我的附件:https://www.dropbox.com/s/yivani7dvh98wpa/SignedData.bin?dl=0),它可以在C#中验证:

    //signed data is loaded from my attached file.
    bool VerifyPKCS7(byte[] signedData)
    {
        try
        {
            SignedCms signedCms = new SignedCms();
            signedCms.Decode(signedData);

            signedCms.CheckSignature(true);

            return true;
        }
        catch
        {

        }

        return false;
    }

但它无法使用Java中的Bouncy Castle库(bcprov-jdk15on-153.jar,bcpkix-jdk15on-153.jar)进行验证:

  //encapSigData is loaded from my attached file.      
  CMSSignedDataParser     sp = new CMSSignedDataParser(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build(), encapSigData);

  sp.getSignedContent().drain();

  Store                   certStore = sp.getCertificates();
  SignerInformationStore  signers = sp.getSignerInfos();

  Collection              c = signers.getSigners();
  Iterator                it = c.iterator();

  while (it.hasNext())
  {
      SignerInformation   signer = (SignerInformation)it.next();
      Collection          certCollection = certStore.getMatches(signer.getSID());

      Iterator        certIt = certCollection.iterator();
      X509CertificateHolder cert = (X509CertificateHolder)certIt.next();

      System.out.println("verify returns: " + signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider("BC").build(cert)));
  }

我在第一个代码行(CMSSignedDataParser构造函数)中遇到异常:

java.lang.ClassCastException: org.bouncycastle.asn1.DERSequenceParser cannot be cast to org.bouncycastle.asn1.ASN1OctetStringParser
at org.bouncycastle.cms.CMSSignedDataParser.<init>(Unknown Source)
at org.bouncycastle.cms.CMSSignedDataParser.<init>(Unknown Source)
at org.bouncycastle.cms.CMSSignedDataParser.<init>(Unknown Source)

经过一些分析后,我发现 SignedData contentInfo 内容是一个序列。似乎bouncycastle不能接受序列作为内容

如何在Java中使用bouncycastle验证 SignedData

1 个答案:

答案 0 :(得分:1)

这里的问题是,与常规CMS消息不同,这实际上是PKCS7消息。现在已经在Bouncy Castle的bcpkix API中添加了对这些的支持。

您可以在http://www.bouncycastle.org/betas 154b12或更高版本的最新测试版中找到它。