1 files changed, 57 insertions, 0 deletions
diff --git a/Crypto/src/crypto/generators/DesKeyGenerator.cs b/Crypto/src/crypto/generators/DesKeyGenerator.cs
new file mode 100644
index 000000000..154e3471a
--- /dev/null
+++ b/Crypto/src/crypto/generators/DesKeyGenerator.cs
@@ -0,0 +1,57 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace Org.BouncyCastle.Crypto.Generators
+{
+    public class DesKeyGenerator
+		: CipherKeyGenerator
+    {
+		public DesKeyGenerator()
+		{
+		}
+
+		internal DesKeyGenerator(
+			int defaultStrength)
+			: base(defaultStrength)
+		{
+		}
+
+		/**
+		* initialise the key generator - if strength is set to zero
+		* the key generated will be 64 bits in size, otherwise
+		* strength can be 64 or 56 bits (if you don't count the parity bits).
+		*
+		* @param param the parameters to be used for key generation
+		*/
+		protected override void engineInit(
+			KeyGenerationParameters parameters)
+		{
+			base.engineInit(parameters);
+
+			if (strength == 0 || strength == (56 / 8))
+			{
+				strength = DesParameters.DesKeyLength;
+			}
+			else if (strength != DesParameters.DesKeyLength)
+			{
+				throw new ArgumentException(
+					"DES key must be " + (DesParameters.DesKeyLength * 8) + " bits long.");
+			}
+		}
+
+		protected override byte[] engineGenerateKey()
+        {
+            byte[] newKey;
+
+			do
+            {
+				newKey = random.GenerateSeed(DesParameters.DesKeyLength);
+				DesParameters.SetOddParity(newKey);
+            }
+            while (DesParameters.IsWeakKey(newKey, 0));
+
+			return newKey;
+        }
+    }
+}