public CmsEnvelopedDataParser(
            Stream envelopedData)
            : base(envelopedData)
        {
            this._attrNotRead  = true;
            this.envelopedData = new EnvelopedDataParser(
                (Asn1SequenceParser)this.contentInfo.GetContent(Asn1Tags.Sequence));

            // TODO Validate version?
            //DerInteger version = this.envelopedData.Version;

            //
            // read the recipients
            //
            Asn1Set recipientInfos = Asn1Set.GetInstance(this.envelopedData.GetRecipientInfos().ToAsn1Object());

            //
            // read the encrypted content info
            //
            EncryptedContentInfoParser encInfo = this.envelopedData.GetEncryptedContentInfo();

            this._encAlg = encInfo.ContentEncryptionAlgorithm;
            CmsReadable readable = new CmsProcessableInputStream(
                ((Asn1OctetStringParser)encInfo.GetEncryptedContent(Asn1Tags.OctetString)).GetOctetStream());
            CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsEnvelopedSecureReadable(
                this._encAlg, readable);

            //
            // build the RecipientInformationStore
            //
            this.recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
                recipientInfos, secureReadable);
        }
        public CmsAuthenticatedDataParser(
            Stream envelopedData)
            : base(envelopedData)
        {
            this.authAttrNotRead = true;
            this.authData        = new AuthenticatedDataParser(
                (Asn1SequenceParser)contentInfo.GetContent(Asn1Tags.Sequence));

            // TODO Validate version?
            //DerInteger version = this.authData.getVersion();

            //
            // read the recipients
            //
            Asn1Set recipientInfos = Asn1Set.GetInstance(authData.GetRecipientInfos().ToAsn1Object());

            this.macAlg = authData.GetMacAlgorithm();

            //
            // read the authenticated content info
            //
            ContentInfoParser data     = authData.GetEnapsulatedContentInfo();
            CmsReadable       readable = new CmsProcessableInputStream(
                ((Asn1OctetStringParser)data.GetContent(Asn1Tags.OctetString)).GetOctetStream());
            CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(
                this.macAlg, readable);

            //
            // build the RecipientInformationStore
            //
            this._recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
                recipientInfos, secureReadable);
        }