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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Crmf
{
public class EncryptedValue
: Asn1Encodable
{
public static EncryptedValue GetInstance(object obj)
{
if (obj is EncryptedValue encryptedValue)
return encryptedValue;
if (obj != null)
return new EncryptedValue(Asn1Sequence.GetInstance(obj));
return null;
}
private readonly AlgorithmIdentifier m_intendedAlg;
private readonly AlgorithmIdentifier m_symmAlg;
private readonly DerBitString m_encSymmKey;
private readonly AlgorithmIdentifier m_keyAlg;
private readonly Asn1OctetString m_valueHint;
private readonly DerBitString m_encValue;
private EncryptedValue(Asn1Sequence seq)
{
int index = 0;
while (seq[index] is Asn1TaggedObject tObj)
{
switch (tObj.TagNo)
{
case 0:
m_intendedAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 1:
m_symmAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 2:
m_encSymmKey = DerBitString.GetInstance(tObj, false);
break;
case 3:
m_keyAlg = AlgorithmIdentifier.GetInstance(tObj, false);
break;
case 4:
m_valueHint = Asn1OctetString.GetInstance(tObj, false);
break;
}
++index;
}
m_encValue = DerBitString.GetInstance(seq[index]);
}
public EncryptedValue(AlgorithmIdentifier intendedAlg, AlgorithmIdentifier symmAlg, DerBitString encSymmKey,
AlgorithmIdentifier keyAlg, Asn1OctetString valueHint, DerBitString encValue)
{
if (encValue == null)
throw new ArgumentNullException(nameof(encValue));
m_intendedAlg = intendedAlg;
m_symmAlg = symmAlg;
m_encSymmKey = encSymmKey;
m_keyAlg = keyAlg;
m_valueHint = valueHint;
m_encValue = encValue;
}
public virtual AlgorithmIdentifier IntendedAlg => m_intendedAlg;
public virtual AlgorithmIdentifier SymmAlg => m_symmAlg;
public virtual DerBitString EncSymmKey => m_encSymmKey;
public virtual AlgorithmIdentifier KeyAlg => m_keyAlg;
public virtual Asn1OctetString ValueHint => m_valueHint;
public virtual DerBitString EncValue => m_encValue;
/**
* <pre>
* (IMPLICIT TAGS)
* 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(6);
v.AddOptionalTagged(false, 0, m_intendedAlg);
v.AddOptionalTagged(false, 1, m_symmAlg);
v.AddOptionalTagged(false, 2, m_encSymmKey);
v.AddOptionalTagged(false, 3, m_keyAlg);
v.AddOptionalTagged(false, 4, m_valueHint);
v.Add(m_encValue);
return new DerSequence(v);
}
}
}
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