1 files changed, 82 insertions, 0 deletions
diff --git a/Crypto/src/asn1/LazyDERSequence.cs b/Crypto/src/asn1/LazyDERSequence.cs
new file mode 100644
index 000000000..5e3dd076e
--- /dev/null
+++ b/Crypto/src/asn1/LazyDERSequence.cs
@@ -0,0 +1,82 @@
+using System;
+using System.Collections;
+using System.Diagnostics;
+
+namespace Org.BouncyCastle.Asn1
+{
+ internal class LazyDerSequence
+ : DerSequence
+ {
+ private byte[] encoded;
+ private bool parsed = false;
+
+ internal LazyDerSequence(
+ byte[] encoded)
+ {
+ this.encoded = encoded;
+ }
+
+ private void Parse()
+ {
+ lock (this)
+ {
+ if (!parsed)
+ {
+ Asn1InputStream e = new LazyAsn1InputStream(encoded);
+
+ Asn1Object o;
+ while ((o = e.ReadObject()) != null)
+ {
+ AddObject(o);
+ }
+
+ encoded = null;
+ parsed = true;
+ }
+ }
+ }
+
+ public override Asn1Encodable this[int index]
+ {
+ get
+ {
+ Parse();
+
+ return base[index];
+ }
+ }
+
+ public override IEnumerator GetEnumerator()
+ {
+ Parse();
+
+ return base.GetEnumerator();
+ }
+
+ public override int Count
+ {
+ get
+ {
+ Parse();
+
+ return base.Count;
+ }
+ }
+
+ internal override void Encode(
+ DerOutputStream derOut)
+ {
+ lock (this)
+ {
+ if (parsed)
+ {
+ base.Encode(derOut);
+ }
+ else
+ {
+ derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, encoded);
+ }
+ }
+ }
+ }
+}
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