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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.IO;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Cms
{
public abstract class RecipientInformation
{
internal RecipientID rid = new RecipientID();
internal AlgorithmIdentifier keyEncAlg;
internal CmsSecureReadable secureReadable;
private byte[] resultMac;
internal RecipientInformation(
AlgorithmIdentifier keyEncAlg,
CmsSecureReadable secureReadable)
{
this.keyEncAlg = keyEncAlg;
this.secureReadable = secureReadable;
}
internal string GetContentAlgorithmName()
{
AlgorithmIdentifier algorithm = secureReadable.Algorithm;
// return CmsEnvelopedHelper.Instance.GetSymmetricCipherName(algorithm.Algorithm.Id);
return algorithm.Algorithm.Id;
}
public RecipientID RecipientID
{
get { return rid; }
}
public AlgorithmIdentifier KeyEncryptionAlgorithmID
{
get { return keyEncAlg; }
}
/**
* return the object identifier for the key encryption algorithm.
*
* @return OID for key encryption algorithm.
*/
public string KeyEncryptionAlgOid
{
get { return keyEncAlg.Algorithm.Id; }
}
/**
* return the ASN.1 encoded key encryption algorithm parameters, or null if
* there aren't any.
*
* @return ASN.1 encoding of key encryption algorithm parameters.
*/
public Asn1Object KeyEncryptionAlgParams
{
get
{
Asn1Encodable ae = keyEncAlg.Parameters;
return ae == null ? null : ae.ToAsn1Object();
}
}
internal CmsTypedStream GetContentFromSessionKey(
KeyParameter sKey)
{
CmsReadable readable = secureReadable.GetReadable(sKey);
try
{
return new CmsTypedStream(readable.GetInputStream());
}
catch (IOException e)
{
throw new CmsException("error getting .", e);
}
}
public byte[] GetContent(
ICipherParameters key)
{
try
{
return CmsUtilities.StreamToByteArray(GetContentStream(key).ContentStream);
}
catch (IOException e)
{
throw new Exception("unable to parse internal stream: " + e);
}
}
/**
* Return the MAC calculated for the content stream. Note: this call is only meaningful once all
* the content has been read.
*
* @return byte array containing the mac.
*/
public byte[] GetMac()
{
if (resultMac == null)
{
object cryptoObject = secureReadable.CryptoObject;
if (cryptoObject is IMac mac)
{
resultMac = MacUtilities.DoFinal(mac);
}
}
return Arrays.Clone(resultMac);
}
public abstract CmsTypedStream GetContentStream(ICipherParameters key);
}
}
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