70 lines
2.4 KiB
C#
70 lines
2.4 KiB
C#
using System.IO;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.Cms;
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using Org.BouncyCastle.Asn1.X509;
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namespace Org.BouncyCastle.Cms;
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public class CmsEnvelopedDataParser : CmsContentInfoParser
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{
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internal RecipientInformationStore recipientInfoStore;
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internal EnvelopedDataParser envelopedData;
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private AlgorithmIdentifier _encAlg;
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private Org.BouncyCastle.Asn1.Cms.AttributeTable _unprotectedAttributes;
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private bool _attrNotRead;
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public AlgorithmIdentifier EncryptionAlgorithmID => _encAlg;
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public string EncryptionAlgOid => _encAlg.Algorithm.Id;
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public Asn1Object EncryptionAlgParams => _encAlg.Parameters?.ToAsn1Object();
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public CmsEnvelopedDataParser(byte[] envelopedData)
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: this(new MemoryStream(envelopedData, writable: false))
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{
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}
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public CmsEnvelopedDataParser(Stream envelopedData)
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: base(envelopedData)
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{
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_attrNotRead = true;
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this.envelopedData = new EnvelopedDataParser((Asn1SequenceParser)contentInfo.GetContent(16));
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Asn1Set instance = Asn1Set.GetInstance(this.envelopedData.GetRecipientInfos().ToAsn1Object());
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EncryptedContentInfoParser encryptedContentInfo = this.envelopedData.GetEncryptedContentInfo();
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_encAlg = encryptedContentInfo.ContentEncryptionAlgorithm;
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CmsReadable readable = new CmsProcessableInputStream(((Asn1OctetStringParser)encryptedContentInfo.GetEncryptedContent(4)).GetOctetStream());
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CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsEnvelopedSecureReadable(_encAlg, readable);
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recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(instance, secureReadable);
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}
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public RecipientInformationStore GetRecipientInfos()
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{
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return recipientInfoStore;
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}
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public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnprotectedAttributes()
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{
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if (_unprotectedAttributes == null && _attrNotRead)
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{
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Asn1SetParser unprotectedAttrs = envelopedData.GetUnprotectedAttrs();
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_attrNotRead = false;
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if (unprotectedAttrs != null)
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{
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Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
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IAsn1Convertible asn1Convertible;
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while ((asn1Convertible = unprotectedAttrs.ReadObject()) != null)
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{
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Asn1SequenceParser asn1SequenceParser = (Asn1SequenceParser)asn1Convertible;
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asn1EncodableVector.Add(asn1SequenceParser.ToAsn1Object());
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}
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_unprotectedAttributes = new Org.BouncyCastle.Asn1.Cms.AttributeTable(new DerSet(asn1EncodableVector));
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}
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}
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return _unprotectedAttributes;
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}
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}
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