using Org.BouncyCastle.Asn1; using Org.BouncyCastle.Asn1.Cms; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Crypto.Parameters; using System.IO; namespace Org.BouncyCastle.Cms { internal class CmsAuthEnvelopedData { private class AuthEnvelopedSecureReadable : CmsSecureReadable { private readonly CmsAuthEnvelopedData parent; public AlgorithmIdentifier Algorithm => parent.authEncAlg; public object CryptoObject => null; internal AuthEnvelopedSecureReadable(CmsAuthEnvelopedData parent) { this.parent = parent; } public CmsReadable GetReadable(KeyParameter key) { throw new CmsException("AuthEnveloped data decryption not yet implemented"); } } 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 instance = AuthEnvelopedData.GetInstance(contentInfo.Content); originator = instance.OriginatorInfo; Asn1Set recipientInfos = instance.RecipientInfos; EncryptedContentInfo authEncryptedContentInfo = instance.AuthEncryptedContentInfo; authEncAlg = authEncryptedContentInfo.ContentEncryptionAlgorithm; CmsSecureReadable secureReadable = new AuthEnvelopedSecureReadable(this); recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(recipientInfos, secureReadable); authAttrs = instance.AuthAttrs; mac = instance.Mac.GetOctets(); unauthAttrs = instance.UnauthAttrs; } } }