CMSAuthEnvelopedData.cs :  » PDF » iTextSharp » Org » BouncyCastle » Cms » C# / CSharp Open Source

using System;
using System.Collections;
using System.IO;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Cms{
  /**
  * containing class for an CMS AuthEnveloped Data object
  */
  internal class CmsAuthEnvelopedData
  {
    internal RecipientInformationStore recipientInfoStore;
    internal ContentInfo contentInfo;

    private OriginatorInfo      originator;
    private AlgorithmIdentifier authEncAlg;
    private Asn1Set             authAttrs;
    private byte[]              mac;
    private Asn1Set             unauthAttrs;
  
    public CmsAuthEnvelopedData(
      byte[] authEnvData)
      : this(CmsUtilities.ReadContentInfo(authEnvData))
    {
    }

    public CmsAuthEnvelopedData(
      Stream authEnvData)
      : this(CmsUtilities.ReadContentInfo(authEnvData))
    {
    }

    public CmsAuthEnvelopedData(
      ContentInfo contentInfo)
    {
      this.contentInfo = contentInfo;

      AuthEnvelopedData authEnvData = AuthEnvelopedData.GetInstance(contentInfo.Content);

      this.originator = authEnvData.OriginatorInfo;

      //
      // read the encrypted content info
      //
      EncryptedContentInfo authEncInfo = authEnvData.AuthEncryptedContentInfo;

      this.authEncAlg = authEncInfo.ContentEncryptionAlgorithm;

      //
      // load the RecipientInfoStore
      //
      byte[] contentOctets = authEncInfo.EncryptedContent.GetOctets();
      IList infos = CmsEnvelopedHelper.ReadRecipientInfos(
        authEnvData.RecipientInfos, contentOctets, null, null, authEncAlg);
      this.recipientInfoStore = new RecipientInformationStore(infos);

      // FIXME These need to be passed to the AEAD cipher as AAD (Additional Authenticated Data)
      this.authAttrs = authEnvData.AuthAttrs;

      this.mac = authEnvData.Mac.GetOctets();

      this.unauthAttrs = authEnvData.UnauthAttrs;
    }
  }
}