1 files changed, 109 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/AlgorithmIdentifier.cs b/crypto/src/asn1/x509/AlgorithmIdentifier.cs
new file mode 100644
index 000000000..4ed3a400d
--- /dev/null
+++ b/crypto/src/asn1/x509/AlgorithmIdentifier.cs
@@ -0,0 +1,109 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ public class AlgorithmIdentifier
+ : Asn1Encodable
+ {
+ private readonly DerObjectIdentifier objectID;
+ private readonly Asn1Encodable parameters;
+ private readonly bool parametersDefined;
+
+ public static AlgorithmIdentifier GetInstance(
+ Asn1TaggedObject obj,
+ bool explicitly)
+ {
+ return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+ }
+
+ public static AlgorithmIdentifier GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is AlgorithmIdentifier)
+ return (AlgorithmIdentifier) obj;
+
+ // TODO: delete
+ if (obj is DerObjectIdentifier)
+ return new AlgorithmIdentifier((DerObjectIdentifier) obj);
+
+ // TODO: delete
+ if (obj is string)
+ return new AlgorithmIdentifier((string) obj);
+
+ return new AlgorithmIdentifier(Asn1Sequence.GetInstance(obj));
+ }
+
+ public AlgorithmIdentifier(
+ DerObjectIdentifier objectID)
+ {
+ this.objectID = objectID;
+ }
+
+ public AlgorithmIdentifier(
+ string objectID)
+ {
+ this.objectID = new DerObjectIdentifier(objectID);
+ }
+
+ public AlgorithmIdentifier(
+ DerObjectIdentifier objectID,
+ Asn1Encodable parameters)
+ {
+ this.objectID = objectID;
+ this.parameters = parameters;
+ this.parametersDefined = true;
+ }
+
+ internal AlgorithmIdentifier(
+ Asn1Sequence seq)
+ {
+ if (seq.Count < 1 || seq.Count > 2)
+ throw new ArgumentException("Bad sequence size: " + seq.Count);
+
+ this.objectID = DerObjectIdentifier.GetInstance(seq[0]);
+ this.parametersDefined = (seq.Count == 2);
+
+ if (parametersDefined)
+ {
+ this.parameters = seq[1];
+ }
+ }
+
+ public virtual DerObjectIdentifier ObjectID
+ {
+ get { return objectID; }
+ }
+
+ public Asn1Encodable Parameters
+ {
+ get { return parameters; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <pre>
+ * AlgorithmIdentifier ::= Sequence {
+ * algorithm OBJECT IDENTIFIER,
+ * parameters ANY DEFINED BY algorithm OPTIONAL }
+ * </pre>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector(objectID);
+
+ if (parametersDefined)
+ {
+ if (parameters != null)
+ {
+ v.Add(parameters);
+ }
+ else
+ {
+ v.Add(DerNull.Instance);
+ }
+ }
+
+ return new DerSequence(v);
+ }
+ }
+}
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