1 files changed, 145 insertions, 0 deletions
diff --git a/crypto/src/asn1/icao/LDSSecurityObject.cs b/crypto/src/asn1/icao/LDSSecurityObject.cs
new file mode 100644
index 000000000..c33ca6877
--- /dev/null
+++ b/crypto/src/asn1/icao/LDSSecurityObject.cs
@@ -0,0 +1,145 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+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;
+
+		private DerInteger version = new DerInteger(0);
+		private AlgorithmIdentifier digestAlgorithmIdentifier;
+		private DataGroupHash[] datagroupHash;
+		private LdsVersionInfo versionInfo;
+
+		public static LdsSecurityObject GetInstance(
+			object obj)
+		{
+			if (obj is LdsSecurityObject)
+				return (LdsSecurityObject)obj;
+
+			if (obj != null)
+				return new LdsSecurityObject(Asn1Sequence.GetInstance(obj));
+
+			return null;
+		}
+
+		private LdsSecurityObject(
+			Asn1Sequence seq)
+		{
+			if (seq == null || seq.Count == 0)
+				throw new ArgumentException("null or empty sequence passed.");
+
+			IEnumerator e = seq.GetEnumerator();
+
+			// version
+			e.MoveNext();
+			version = DerInteger.GetInstance(e.Current);
+			// digestAlgorithmIdentifier
+			e.MoveNext();
+			digestAlgorithmIdentifier = AlgorithmIdentifier.GetInstance(e.Current);
+
+			e.MoveNext();
+			Asn1Sequence datagroupHashSeq = Asn1Sequence.GetInstance(e.Current);
+
+			if (version.Value.Equals(BigInteger.One))
+			{
+				e.MoveNext();
+				versionInfo = LdsVersionInfo.GetInstance(e.Current);
+			}
+
+			CheckDatagroupHashSeqSize(datagroupHashSeq.Count);
+
+			datagroupHash = new DataGroupHash[datagroupHashSeq.Count];
+			for (int i= 0; i< datagroupHashSeq.Count; i++)
+			{
+				datagroupHash[i] = DataGroupHash.GetInstance(datagroupHashSeq[i]);
+			}
+		}
+
+		public LdsSecurityObject(
+			AlgorithmIdentifier	digestAlgorithmIdentifier,
+			DataGroupHash[]		datagroupHash)
+		{
+			this.version = new DerInteger(0);
+			this.digestAlgorithmIdentifier = digestAlgorithmIdentifier;
+			this.datagroupHash = datagroupHash;
+
+			CheckDatagroupHashSeqSize(datagroupHash.Length);
+		}
+
+
+		public LdsSecurityObject(
+			AlgorithmIdentifier	digestAlgorithmIdentifier,
+			DataGroupHash[]		datagroupHash,
+			LdsVersionInfo		versionInfo)
+		{
+			this.version = new DerInteger(1);
+			this.digestAlgorithmIdentifier = digestAlgorithmIdentifier;
+			this.datagroupHash = datagroupHash;
+			this.versionInfo = versionInfo;
+
+			CheckDatagroupHashSeqSize(datagroupHash.Length);
+		}
+
+		private void CheckDatagroupHashSeqSize(int size)
+		{
+			if (size < 2 || size > UBDataGroups)
+				throw new ArgumentException("wrong size in DataGroupHashValues : not in (2.."+ UBDataGroups +")");
+		}
+
+		public BigInteger Version
+		{
+			get { return version.Value; }
+		}
+
+		public AlgorithmIdentifier DigestAlgorithmIdentifier
+		{
+			get { return digestAlgorithmIdentifier; }
+		}
+
+		public DataGroupHash[] GetDatagroupHash()
+		{
+			return datagroupHash;
+		}
+
+		public LdsVersionInfo VersionInfo
+		{
+			get { return versionInfo; }
+		}
+
+		public override Asn1Object ToAsn1Object()
+		{
+			DerSequence hashSeq = new DerSequence(datagroupHash);
+
+			Asn1EncodableVector v = new Asn1EncodableVector(version, digestAlgorithmIdentifier, hashSeq);
+
+			if (versionInfo != null)
+			{
+				v.Add(versionInfo);
+			}
+
+			return new DerSequence(v);
+		}
+	}
+}