1 files changed, 100 insertions, 0 deletions
diff --git a/Crypto/src/crypto/engines/DesEdeEngine.cs b/Crypto/src/crypto/engines/DesEdeEngine.cs
new file mode 100644
index 000000000..b319888e3
--- /dev/null
+++ b/Crypto/src/crypto/engines/DesEdeEngine.cs
@@ -0,0 +1,100 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace Org.BouncyCastle.Crypto.Engines
+{
+	/// <remarks>A class that provides a basic DESede (or Triple DES) engine.</remarks>
+    public class DesEdeEngine
+		: DesEngine
+    {
+        private int[] workingKey1, workingKey2, workingKey3;
+        private bool forEncryption;
+
+		/**
+		* initialise a DESede cipher.
+		*
+		* @param forEncryption whether or not we are for encryption.
+		* @param parameters the parameters required to set up the cipher.
+		* @exception ArgumentException if the parameters argument is
+		* inappropriate.
+		*/
+		public override void Init(
+			bool				forEncryption,
+			ICipherParameters	parameters)
+		{
+			if (!(parameters is KeyParameter))
+			{
+				throw new ArgumentException("invalid parameter passed to DESede init - " + parameters.GetType().ToString());
+			}
+
+			byte[] keyMaster = ((KeyParameter)parameters).GetKey();
+
+			this.forEncryption = forEncryption;
+
+			byte[] key1 = new byte[8];
+			Array.Copy(keyMaster, 0, key1, 0, key1.Length);
+			workingKey1 = GenerateWorkingKey(forEncryption, key1);
+
+			byte[] key2 = new byte[8];
+			Array.Copy(keyMaster, 8, key2, 0, key2.Length);
+			workingKey2 = GenerateWorkingKey(!forEncryption, key2);
+
+			if (keyMaster.Length == 24)
+			{
+				byte[] key3 = new byte[8];
+				Array.Copy(keyMaster, 16, key3, 0, key3.Length);
+				workingKey3 = GenerateWorkingKey(forEncryption, key3);
+			}
+			else        // 16 byte key
+			{
+				workingKey3 = workingKey1;
+			}
+		}
+
+		public override string AlgorithmName
+        {
+            get { return "DESede"; }
+        }
+
+		public override int GetBlockSize()
+        {
+            return BLOCK_SIZE;
+        }
+
+		public override int ProcessBlock(
+            byte[]	input,
+            int		inOff,
+            byte[]	output,
+            int		outOff)
+        {
+            if (workingKey1 == null)
+                throw new InvalidOperationException("DESede engine not initialised");
+            if ((inOff + BLOCK_SIZE) > input.Length)
+                throw new DataLengthException("input buffer too short");
+            if ((outOff + BLOCK_SIZE) > output.Length)
+                throw new DataLengthException("output buffer too short");
+
+			byte[] temp = new byte[BLOCK_SIZE];
+
+			if (forEncryption)
+            {
+                DesFunc(workingKey1, input, inOff, temp, 0);
+                DesFunc(workingKey2, temp, 0, temp, 0);
+                DesFunc(workingKey3, temp, 0, output, outOff);
+            }
+            else
+            {
+                DesFunc(workingKey3, input, inOff, temp, 0);
+                DesFunc(workingKey2, temp, 0, temp, 0);
+                DesFunc(workingKey1, temp, 0, output, outOff);
+            }
+
+			return BLOCK_SIZE;
+        }
+
+		public override void Reset()
+        {
+        }
+    }
+}