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117 lines
3.2 KiB
117 lines
3.2 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections;
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using System.IO;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Cms;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.X509;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Cms
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{
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/**
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* containing class for an CMS AuthEnveloped Data object
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*/
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internal class CmsAuthEnvelopedData
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{
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internal RecipientInformationStore recipientInfoStore;
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internal ContentInfo contentInfo;
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private OriginatorInfo originator;
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private AlgorithmIdentifier authEncAlg;
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private Asn1Set authAttrs;
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private byte[] mac;
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private Asn1Set unauthAttrs;
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public CmsAuthEnvelopedData(
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byte[] authEnvData)
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: this(CmsUtilities.ReadContentInfo(authEnvData))
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{
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}
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public CmsAuthEnvelopedData(
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Stream authEnvData)
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: this(CmsUtilities.ReadContentInfo(authEnvData))
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{
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}
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public CmsAuthEnvelopedData(
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ContentInfo contentInfo)
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{
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this.contentInfo = contentInfo;
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AuthEnvelopedData authEnvData = AuthEnvelopedData.GetInstance(contentInfo.Content);
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this.originator = authEnvData.OriginatorInfo;
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//
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// read the recipients
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//
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Asn1Set recipientInfos = authEnvData.RecipientInfos;
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//
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// read the auth-encrypted content info
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//
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EncryptedContentInfo authEncInfo = authEnvData.AuthEncryptedContentInfo;
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this.authEncAlg = authEncInfo.ContentEncryptionAlgorithm;
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CmsSecureReadable secureReadable = new AuthEnvelopedSecureReadable(this);
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//
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// build the RecipientInformationStore
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//
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this.recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
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recipientInfos, secureReadable);
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// FIXME These need to be passed to the AEAD cipher as AAD (Additional Authenticated Data)
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this.authAttrs = authEnvData.AuthAttrs;
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this.mac = authEnvData.Mac.GetOctets();
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this.unauthAttrs = authEnvData.UnauthAttrs;
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}
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private class AuthEnvelopedSecureReadable : CmsSecureReadable
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{
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private readonly CmsAuthEnvelopedData parent;
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internal AuthEnvelopedSecureReadable(CmsAuthEnvelopedData parent)
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{
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this.parent = parent;
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}
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public AlgorithmIdentifier Algorithm
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{
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get { return parent.authEncAlg; }
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}
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public object CryptoObject
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{
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get { return null; }
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}
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public CmsReadable GetReadable(KeyParameter key)
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{
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// TODO Create AEAD cipher instance to decrypt and calculate tag ( MAC)
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throw new CmsException("AuthEnveloped data decryption not yet implemented");
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// RFC 5084 ASN.1 Module
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// -- Parameters for AlgorithmIdentifier
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//
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// CCMParameters ::= SEQUENCE {
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// aes-nonce OCTET STRING (SIZE(7..13)),
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// aes-ICVlen AES-CCM-ICVlen DEFAULT 12 }
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//
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// AES-CCM-ICVlen ::= INTEGER (4 | 6 | 8 | 10 | 12 | 14 | 16)
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//
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// GCMParameters ::= SEQUENCE {
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// aes-nonce OCTET STRING, -- recommended size is 12 octets
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// aes-ICVlen AES-GCM-ICVlen DEFAULT 12 }
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//
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// AES-GCM-ICVlen ::= INTEGER (12 | 13 | 14 | 15 | 16)
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}
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}
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}
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}
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#pragma warning restore
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#endif
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