diff --git a/Crypto/src/bcpg/SecretSubkeyPacket.cs b/Crypto/src/bcpg/SecretSubkeyPacket.cs
new file mode 100644
index 000000000..8f1746942
--- /dev/null
+++ b/Crypto/src/bcpg/SecretSubkeyPacket.cs
@@ -0,0 +1,43 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Bcpg
+{
+ /// <remarks>Basic packet for a PGP secret key.</remarks>
+ public class SecretSubkeyPacket
+ : SecretKeyPacket
+ {
+ internal SecretSubkeyPacket(
+ BcpgInputStream bcpgIn)
+ : base(bcpgIn)
+ {
+ }
+
+ public SecretSubkeyPacket(
+ PublicKeyPacket pubKeyPacket,
+ SymmetricKeyAlgorithmTag encAlgorithm,
+ S2k s2k,
+ byte[] iv,
+ byte[] secKeyData)
+ : base(pubKeyPacket, encAlgorithm, s2k, iv, secKeyData)
+ {
+ }
+
+ public SecretSubkeyPacket(
+ PublicKeyPacket pubKeyPacket,
+ SymmetricKeyAlgorithmTag encAlgorithm,
+ int s2kUsage,
+ S2k s2k,
+ byte[] iv,
+ byte[] secKeyData)
+ : base(pubKeyPacket, encAlgorithm, s2kUsage, s2k, iv, secKeyData)
+ {
+ }
+
+ public override void Encode(
+ BcpgOutputStream bcpgOut)
+ {
+ bcpgOut.WritePacket(PacketTag.SecretSubkey, GetEncodedContents(), true);
+ }
+ }
+}
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