1 files changed, 170 insertions, 0 deletions
diff --git a/Crypto/src/bcpg/SecretKeyPacket.cs b/Crypto/src/bcpg/SecretKeyPacket.cs
new file mode 100644
index 000000000..d9ceab4f1
--- /dev/null
+++ b/Crypto/src/bcpg/SecretKeyPacket.cs
@@ -0,0 +1,170 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg
+{
+	/// <remarks>Basic packet for a PGP secret key.</remarks>
+    public class SecretKeyPacket
+        : ContainedPacket //, PublicKeyAlgorithmTag
+    {
+		public const int UsageNone = 0x00;
+		public const int UsageChecksum = 0xff;
+		public const int UsageSha1 = 0xfe;
+
+		private PublicKeyPacket pubKeyPacket;
+        private readonly byte[] secKeyData;
+		private int s2kUsage;
+		private SymmetricKeyAlgorithmTag encAlgorithm;
+        private S2k s2k;
+        private byte[] iv;
+
+		internal SecretKeyPacket(
+            BcpgInputStream bcpgIn)
+        {
+			if (this is SecretSubkeyPacket)
+			{
+				pubKeyPacket = new PublicSubkeyPacket(bcpgIn);
+			}
+			else
+			{
+				pubKeyPacket = new PublicKeyPacket(bcpgIn);
+			}
+
+			s2kUsage = bcpgIn.ReadByte();
+
+			if (s2kUsage == UsageChecksum || s2kUsage == UsageSha1)
+            {
+                encAlgorithm = (SymmetricKeyAlgorithmTag) bcpgIn.ReadByte();
+                s2k = new S2k(bcpgIn);
+            }
+            else
+            {
+                encAlgorithm = (SymmetricKeyAlgorithmTag) s2kUsage;
+			}
+
+			if (!(s2k != null && s2k.Type == S2k.GnuDummyS2K && s2k.ProtectionMode == 0x01))
+            {
+				if (s2kUsage != 0)
+				{
+                    if (((int) encAlgorithm) < 7)
+                    {
+                        iv = new byte[8];
+                    }
+                    else
+                    {
+                        iv = new byte[16];
+                    }
+                    bcpgIn.ReadFully(iv);
+                }
+            }
+
+			secKeyData = bcpgIn.ReadAll();
+        }
+
+		public SecretKeyPacket(
+            PublicKeyPacket				pubKeyPacket,
+            SymmetricKeyAlgorithmTag	encAlgorithm,
+            S2k							s2k,
+            byte[]						iv,
+            byte[]						secKeyData)
+        {
+            this.pubKeyPacket = pubKeyPacket;
+            this.encAlgorithm = encAlgorithm;
+
+			if (encAlgorithm != SymmetricKeyAlgorithmTag.Null)
+			{
+				this.s2kUsage = UsageChecksum;
+			}
+			else
+			{
+				this.s2kUsage = UsageNone;
+			}
+
+			this.s2k = s2k;
+			this.iv = Arrays.Clone(iv);
+			this.secKeyData = secKeyData;
+        }
+
+		public SecretKeyPacket(
+			PublicKeyPacket				pubKeyPacket,
+			SymmetricKeyAlgorithmTag	encAlgorithm,
+			int							s2kUsage,
+			S2k							s2k,
+			byte[]						iv,
+			byte[]						secKeyData)
+		{
+			this.pubKeyPacket = pubKeyPacket;
+			this.encAlgorithm = encAlgorithm;
+			this.s2kUsage = s2kUsage;
+			this.s2k = s2k;
+			this.iv = Arrays.Clone(iv);
+			this.secKeyData = secKeyData;
+		}
+
+		public SymmetricKeyAlgorithmTag EncAlgorithm
+        {
+			get { return encAlgorithm; }
+        }
+
+		public int S2kUsage
+		{
+			get { return s2kUsage; }
+		}
+
+		public byte[] GetIV()
+        {
+            return Arrays.Clone(iv);
+        }
+
+		public S2k S2k
+        {
+			get { return s2k; }
+        }
+
+		public PublicKeyPacket PublicKeyPacket
+        {
+			get { return pubKeyPacket; }
+        }
+
+		public byte[] GetSecretKeyData()
+        {
+            return secKeyData;
+        }
+
+		public byte[] GetEncodedContents()
+        {
+            MemoryStream bOut = new MemoryStream();
+            BcpgOutputStream pOut = new BcpgOutputStream(bOut);
+
+            pOut.Write(pubKeyPacket.GetEncodedContents());
+
+			pOut.WriteByte((byte) s2kUsage);
+
+			if (s2kUsage == UsageChecksum || s2kUsage == UsageSha1)
+            {
+                pOut.WriteByte((byte) encAlgorithm);
+                pOut.WriteObject(s2k);
+            }
+
+			if (iv != null)
+            {
+                pOut.Write(iv);
+            }
+
+            if (secKeyData != null && secKeyData.Length > 0)
+            {
+                pOut.Write(secKeyData);
+            }
+
+            return bOut.ToArray();
+        }
+
+        public override void Encode(
+            BcpgOutputStream bcpgOut)
+        {
+            bcpgOut.WritePacket(PacketTag.SecretKey, GetEncodedContents(), true);
+        }
+    }
+}