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using System;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Asn1.Tsp
{
/**
* Implementation of PartialHashtree, as defined in RFC 4998.
* <p>
* The ASN.1 notation for a PartialHashTree is:
* <p>
* PartialHashtree ::= SEQUENCE OF OCTET STRING
*/
public class PartialHashtree
: Asn1Encodable
{
/**
* Return a PartialHashtree from the given object.
*
* @param obj the object we want converted.
* @return a PartialHashtree instance, or null.
* @throws IllegalArgumentException if the object cannot be converted.
*/
public static PartialHashtree GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is PartialHashtree partialHashtree)
return partialHashtree;
return new PartialHashtree(Asn1Sequence.GetInstance(obj));
}
public static PartialHashtree GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new PartialHashtree(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
/**
* Hash values that constitute the hash tree, as ASN.1 Octet Strings.
*/
private readonly Asn1Sequence m_values;
private PartialHashtree(Asn1Sequence values)
{
for (int i = 0; i != values.Count; i++)
{
if (!(values[i] is Asn1OctetString))
throw new ArgumentException("unknown object in constructor: " + Platform.GetTypeName(values[i]));
}
m_values = values;
}
public PartialHashtree(byte[] value)
{
m_values = new DerSequence(new DerOctetString(Arrays.Clone(value)));
}
public PartialHashtree(byte[][] values)
{
Asn1EncodableVector v = new Asn1EncodableVector(values.Length);
for (int i = 0; i != values.Length; i++)
{
v.Add(new DerOctetString(Arrays.Clone(values[i])));
}
m_values = new DerSequence(v);
}
public virtual int ValueCount => m_values.Count;
public virtual byte[][] GetValues() => m_values.MapElements(
element => Arrays.Clone(Asn1OctetString.GetInstance(element).GetOctets()));
public virtual bool ContainsHash(byte[] hash)
{
foreach (Asn1OctetString octetString in m_values)
{
byte[] currentHash = octetString.GetOctets();
if (Arrays.FixedTimeEquals(hash, currentHash))
return true;
}
return false;
}
public override Asn1Object ToAsn1Object() => m_values;
}
}
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