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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Crmf
{
public class EncryptedValue
: Asn1Encodable
{
private readonly AlgorithmIdentifier intendedAlg;
private readonly AlgorithmIdentifier symmAlg;
private readonly DerBitString encSymmKey;
private readonly AlgorithmIdentifier keyAlg;
private readonly Asn1OctetString valueHint;
private readonly DerBitString encValue;
private EncryptedValue(Asn1Sequence seq)
{
int index = 0;
while (seq[index] is Asn1TaggedObject)
{
Asn1TaggedObject tObj = (Asn1TaggedObject)seq[index];
switch (tObj.TagNo)
{
case 0:
intendedAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 1:
symmAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 2:
encSymmKey = DerBitString.GetInstance(tObj, false);
break;
case 3:
keyAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 4:
valueHint = Asn1OctetString.GetInstance(tObj, false);
break;
}
++index;
}
encValue = DerBitString.GetInstance(seq[index]);
}
public static EncryptedValue GetInstance(object obj)
{
if (obj is EncryptedValue)
return (EncryptedValue)obj;
if (obj != null)
return new EncryptedValue(Asn1Sequence.GetInstance(obj));
return null;
}
public EncryptedValue(
AlgorithmIdentifier intendedAlg,
AlgorithmIdentifier symmAlg,
DerBitString encSymmKey,
AlgorithmIdentifier keyAlg,
Asn1OctetString valueHint,
DerBitString encValue)
{
if (encValue == null)
{
throw new ArgumentNullException("encValue");
}
this.intendedAlg = intendedAlg;
this.symmAlg = symmAlg;
this.encSymmKey = encSymmKey;
this.keyAlg = keyAlg;
this.valueHint = valueHint;
this.encValue = encValue;
}
public virtual AlgorithmIdentifier IntendedAlg
{
get { return intendedAlg; }
}
public virtual AlgorithmIdentifier SymmAlg
{
get { return symmAlg; }
}
public virtual DerBitString EncSymmKey
{
get { return encSymmKey; }
}
public virtual AlgorithmIdentifier KeyAlg
{
get { return keyAlg; }
}
public virtual Asn1OctetString ValueHint
{
get { return valueHint; }
}
public virtual DerBitString EncValue
{
get { return encValue; }
}
/**
* <pre>
* EncryptedValue ::= SEQUENCE {
* intendedAlg [0] AlgorithmIdentifier OPTIONAL,
* -- the intended algorithm for which the value will be used
* symmAlg [1] AlgorithmIdentifier OPTIONAL,
* -- the symmetric algorithm used to encrypt the value
* encSymmKey [2] BIT STRING OPTIONAL,
* -- the (encrypted) symmetric key used to encrypt the value
* keyAlg [3] AlgorithmIdentifier OPTIONAL,
* -- algorithm used to encrypt the symmetric key
* valueHint [4] OCTET STRING OPTIONAL,
* -- a brief description or identifier of the encValue content
* -- (may be meaningful only to the sending entity, and used only
* -- if EncryptedValue might be re-examined by the sending entity
* -- in the future)
* encValue BIT STRING }
* -- the encrypted value itself
* </pre>
* @return a basic ASN.1 object representation.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector();
AddOptional(v, 0, intendedAlg);
AddOptional(v, 1, symmAlg);
AddOptional(v, 2, encSymmKey);
AddOptional(v, 3, keyAlg);
AddOptional(v, 4, valueHint);
v.Add(encValue);
return new DerSequence(v);
}
private void AddOptional(Asn1EncodableVector v, int tagNo, Asn1Encodable obj)
{
if (obj != null)
{
v.Add(new DerTaggedObject(false, tagNo, obj));
}
}
}
}
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