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using System;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Tsp
{
/**
* Implementation of the Archive Timestamp type defined in RFC4998.
* @see <a href="https://tools.ietf.org/html/rfc4998">RFC 4998</a>
* <p>
* ASN.1 Archive Timestamp
* <p>
* ArchiveTimeStamp ::= SEQUENCE {
* digestAlgorithm [Ø] AlgorithmIdentifier OPTIONAL,
* attributes [1] Attributes OPTIONAL,
* reducedHashtree [2] SEQUENCE OF PartialHashtree OPTIONAL,
* timeStamp ContentInfo}
* <p>
* PartialHashtree ::= SEQUENCE OF OCTET STRING
* <p>
* Attributes ::= SET SIZE (1..MAX) OF Attribute
*/
public class ArchiveTimeStamp
: Asn1Encodable
{
/**
* Return an ArchiveTimestamp from the given object.
*
* @param obj the object we want converted.
* @return an ArchiveTimestamp instance, or null.
* @throws IllegalArgumentException if the object cannot be converted.
*/
public static ArchiveTimeStamp GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is ArchiveTimeStamp archiveTimeStamp)
return archiveTimeStamp;
return new ArchiveTimeStamp(Asn1Sequence.GetInstance(obj));
}
public static ArchiveTimeStamp GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new ArchiveTimeStamp(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly AlgorithmIdentifier m_digestAlgorithm;
private readonly Attributes m_attributes;
private readonly Asn1Sequence m_reducedHashTree;
private readonly ContentInfo m_timeStamp;
public ArchiveTimeStamp(AlgorithmIdentifier digestAlgorithm, PartialHashtree[] reducedHashTree,
ContentInfo timeStamp)
: this(digestAlgorithm, null, reducedHashTree, timeStamp)
{
}
public ArchiveTimeStamp(ContentInfo timeStamp)
: this(null, null, null, timeStamp)
{
}
public ArchiveTimeStamp(AlgorithmIdentifier digestAlgorithm, Attributes attributes,
PartialHashtree[] reducedHashTree, ContentInfo timeStamp)
{
m_digestAlgorithm = digestAlgorithm;
m_attributes = attributes;
if (reducedHashTree != null)
{
m_reducedHashTree = new DerSequence(reducedHashTree);
}
else
{
m_reducedHashTree = null;
}
m_timeStamp = timeStamp;
}
private ArchiveTimeStamp(Asn1Sequence sequence)
{
if (sequence.Count < 1 || sequence.Count > 4)
throw new ArgumentException("wrong sequence size in constructor: " + sequence.Count, nameof(sequence));
AlgorithmIdentifier digAlg = null;
Attributes attrs = null;
Asn1Sequence rHashTree = null;
for (int i = 0; i < sequence.Count - 1; i++)
{
Asn1Encodable obj = sequence[i];
if (obj is Asn1TaggedObject taggedObject)
{
switch (taggedObject.TagNo)
{
case 0:
digAlg = AlgorithmIdentifier.GetInstance(taggedObject, false);
break;
case 1:
attrs = Attributes.GetInstance(taggedObject, false);
break;
case 2:
rHashTree = Asn1Sequence.GetInstance(taggedObject, false);
break;
default:
throw new ArgumentException("invalid tag no in constructor: " + taggedObject.TagNo);
}
}
}
m_digestAlgorithm = digAlg;
m_attributes = attrs;
m_reducedHashTree = rHashTree;
m_timeStamp = ContentInfo.GetInstance(sequence[sequence.Count - 1]);
}
public virtual AlgorithmIdentifier GetDigestAlgorithmIdentifier() => m_digestAlgorithm
?? GetTimeStampInfo().MessageImprint.HashAlgorithm;
public virtual byte[] GetTimeStampDigestValue() => GetTimeStampInfo().MessageImprint.GetHashedMessage();
private TstInfo GetTimeStampInfo()
{
if (!CmsObjectIdentifiers.SignedData.Equals(m_timeStamp.ContentType))
throw new InvalidOperationException("cannot identify algorithm identifier for digest");
SignedData tsData = SignedData.GetInstance(m_timeStamp.Content);
var contentInfo = tsData.EncapContentInfo;
if (!Asn1.Pkcs.PkcsObjectIdentifiers.IdCTTstInfo.Equals(contentInfo.ContentType))
throw new InvalidOperationException("cannot parse time stamp");
return TstInfo.GetInstance(Asn1OctetString.GetInstance(contentInfo.Content).GetOctets());
}
/**
* Return the contents of the digestAlgorithm field - null if not set.
*
* @return the contents of the digestAlgorithm field, or null if not set.
*/
public virtual AlgorithmIdentifier DigestAlgorithm() => m_digestAlgorithm;
/**
* Return the first node in the reduced hash tree which contains the leaf node.
*
* @return the node containing the data hashes, null if no reduced hash tree is present.
*/
public virtual PartialHashtree GetHashTreeLeaf()
{
if (m_reducedHashTree == null)
return null;
return PartialHashtree.GetInstance(m_reducedHashTree[0]);
}
public virtual PartialHashtree[] GetReducedHashTree()
{
if (m_reducedHashTree == null)
return null;
return m_reducedHashTree.MapElements(PartialHashtree.GetInstance);
}
public virtual ContentInfo TimeStamp => m_timeStamp;
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
v.AddOptionalTagged(false, 0, m_digestAlgorithm);
v.AddOptionalTagged(false, 1, m_attributes);
v.AddOptionalTagged(false, 2, m_reducedHashTree);
v.Add(m_timeStamp);
return new DerSequence(v);
}
}
}
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