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using System;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
public class PasswordRecipientInfo
: Asn1Encodable
{
private readonly DerInteger version;
private readonly AlgorithmIdentifier keyDerivationAlgorithm;
private readonly AlgorithmIdentifier keyEncryptionAlgorithm;
private readonly Asn1OctetString encryptedKey;
public PasswordRecipientInfo(
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1OctetString encryptedKey)
{
this.version = new DerInteger(0);
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.encryptedKey = encryptedKey;
}
public PasswordRecipientInfo(
AlgorithmIdentifier keyDerivationAlgorithm,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1OctetString encryptedKey)
{
this.version = new DerInteger(0);
this.keyDerivationAlgorithm = keyDerivationAlgorithm;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.encryptedKey = encryptedKey;
}
public PasswordRecipientInfo(
Asn1Sequence seq)
{
version = (DerInteger) seq[0];
if (seq[1] is Asn1TaggedObject)
{
keyDerivationAlgorithm = AlgorithmIdentifier.GetInstance((Asn1TaggedObject) seq[1], false);
keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
encryptedKey = (Asn1OctetString) seq[3];
}
else
{
keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[1]);
encryptedKey = (Asn1OctetString) seq[2];
}
}
/**
* return a PasswordRecipientInfo object from a tagged object.
*
* @param obj the tagged object holding the object we want.
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static PasswordRecipientInfo GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
/**
* return a PasswordRecipientInfo object from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static PasswordRecipientInfo GetInstance(
object obj)
{
if (obj == null || obj is PasswordRecipientInfo)
return (PasswordRecipientInfo) obj;
if (obj is Asn1Sequence)
return new PasswordRecipientInfo((Asn1Sequence) obj);
throw new ArgumentException("Invalid PasswordRecipientInfo: " + obj.GetType().Name);
}
public DerInteger Version
{
get { return version; }
}
public AlgorithmIdentifier KeyDerivationAlgorithm
{
get { return keyDerivationAlgorithm; }
}
public AlgorithmIdentifier KeyEncryptionAlgorithm
{
get { return keyEncryptionAlgorithm; }
}
public Asn1OctetString EncryptedKey
{
get { return encryptedKey; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* PasswordRecipientInfo ::= Sequence {
* version CMSVersion, -- Always set to 0
* keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier
* OPTIONAL,
* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
* encryptedKey EncryptedKey }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version);
if (keyDerivationAlgorithm != null)
{
v.Add(new DerTaggedObject(false, 0, keyDerivationAlgorithm));
}
v.Add(keyEncryptionAlgorithm, encryptedKey);
return new DerSequence(v);
}
}
}
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