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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1.Icao
{
/**
* The LDSSecurityObject object (V1.8).
* <pre>
* LDSSecurityObject ::= SEQUENCE {
* version LDSSecurityObjectVersion,
* hashAlgorithm DigestAlgorithmIdentifier,
* dataGroupHashValues SEQUENCE SIZE (2..ub-DataGroups) OF DataHashGroup,
* ldsVersionInfo LDSVersionInfo OPTIONAL
* -- if present, version MUST be v1 }
*
* DigestAlgorithmIdentifier ::= AlgorithmIdentifier,
*
* LDSSecurityObjectVersion :: INTEGER {V0(0)}
* </pre>
*/
public class LdsSecurityObject
: Asn1Encodable
{
public const int UBDataGroups = 16;
public static LdsSecurityObject GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is LdsSecurityObject ldsSecurityObject)
return ldsSecurityObject;
return new LdsSecurityObject(Asn1Sequence.GetInstance(obj));
}
public static LdsSecurityObject GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new LdsSecurityObject(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly DerInteger m_version;
private readonly AlgorithmIdentifier m_hashAlgorithm;
private readonly DataGroupHash[] m_datagroupHashValues;
private readonly LdsVersionInfo m_ldsVersionInfo;
private LdsSecurityObject(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 3 || count > 4)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_hashAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_datagroupHashValues = ConvertDataGroupHash(Asn1Sequence.GetInstance(seq[pos++]));
m_ldsVersionInfo = Asn1Utilities.ReadOptional(seq, ref pos, LdsVersionInfo.GetOptional);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
if (m_ldsVersionInfo != null && !m_version.HasValue(1))
throw new ArgumentException("'ldsVersionInfo' is present, but 'version' is NOT 'v1'");
}
public LdsSecurityObject(AlgorithmIdentifier digestAlgorithmIdentifier, DataGroupHash[] datagroupHash)
{
m_version = DerInteger.Zero;
m_hashAlgorithm = digestAlgorithmIdentifier ?? throw new ArgumentNullException(nameof(digestAlgorithmIdentifier)); ;
m_datagroupHashValues = datagroupHash ?? throw new ArgumentNullException(nameof(datagroupHash));
m_ldsVersionInfo = null;
CheckDatagroupHashCount(m_datagroupHashValues.Length);
}
public LdsSecurityObject(AlgorithmIdentifier digestAlgorithmIdentifier, DataGroupHash[] datagroupHash,
LdsVersionInfo versionInfo)
{
m_version = DerInteger.One;
m_hashAlgorithm = digestAlgorithmIdentifier ?? throw new ArgumentNullException(nameof(digestAlgorithmIdentifier)); ;
m_datagroupHashValues = datagroupHash ?? throw new ArgumentNullException(nameof(datagroupHash));
m_ldsVersionInfo = versionInfo;
CheckDatagroupHashCount(m_datagroupHashValues.Length);
}
public BigInteger Version => m_version.Value;
public AlgorithmIdentifier DigestAlgorithmIdentifier => m_hashAlgorithm;
public DataGroupHash[] GetDatagroupHash() => m_datagroupHashValues;
public LdsVersionInfo VersionInfo => m_ldsVersionInfo;
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
v.Add(m_version, m_hashAlgorithm, DerSequence.FromElements(m_datagroupHashValues));
v.AddOptional(m_ldsVersionInfo);
return new DerSequence(v);
}
private static void CheckDatagroupHashCount(int count)
{
if (count < 2 || count > UBDataGroups)
throw new ArgumentException("wrong size in DataGroupHashValues : not in (2.." + UBDataGroups + ")");
}
private static DataGroupHash[] ConvertDataGroupHash(Asn1Sequence seq)
{
CheckDatagroupHashCount(seq.Count);
return seq.MapElements(DataGroupHash.GetInstance);
}
}
}
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