diff --git a/Crypto/src/crypto/parameters/DesEdeParameters.cs b/Crypto/src/crypto/parameters/DesEdeParameters.cs
new file mode 100644
index 000000000..420aaecea
--- /dev/null
+++ b/Crypto/src/crypto/parameters/DesEdeParameters.cs
@@ -0,0 +1,95 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Parameters
+{
+ public class DesEdeParameters
+ : DesParameters
+ {
+ /*
+ * DES-EDE Key length in bytes.
+ */
+ public const int DesEdeKeyLength = 24;
+
+ private static byte[] FixKey(
+ byte[] key,
+ int keyOff,
+ int keyLen)
+ {
+ byte[] tmp = new byte[24];
+
+ switch (keyLen)
+ {
+ case 16:
+ Array.Copy(key, keyOff, tmp, 0, 16);
+ Array.Copy(key, keyOff, tmp, 16, 8);
+ break;
+ case 24:
+ Array.Copy(key, keyOff, tmp, 0, 24);
+ break;
+ default:
+ throw new ArgumentException("Bad length for DESede key: " + keyLen, "keyLen");
+ }
+
+ if (IsWeakKey(tmp))
+ throw new ArgumentException("attempt to create weak DESede key");
+
+ return tmp;
+ }
+
+ public DesEdeParameters(
+ byte[] key)
+ : base(FixKey(key, 0, key.Length))
+ {
+ }
+
+ public DesEdeParameters(
+ byte[] key,
+ int keyOff,
+ int keyLen)
+ : base(FixKey(key, keyOff, keyLen))
+ {
+ }
+
+ /**
+ * return true if the passed in key is a DES-EDE weak key.
+ *
+ * @param key bytes making up the key
+ * @param offset offset into the byte array the key starts at
+ * @param length number of bytes making up the key
+ */
+ public static bool IsWeakKey(
+ byte[] key,
+ int offset,
+ int length)
+ {
+ for (int i = offset; i < length; i += DesKeyLength)
+ {
+ if (DesParameters.IsWeakKey(key, i))
+ {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * return true if the passed in key is a DES-EDE weak key.
+ *
+ * @param key bytes making up the key
+ * @param offset offset into the byte array the key starts at
+ */
+ public static new bool IsWeakKey(
+ byte[] key,
+ int offset)
+ {
+ return IsWeakKey(key, offset, key.Length - offset);
+ }
+
+ public static new bool IsWeakKey(
+ byte[] key)
+ {
+ return IsWeakKey(key, 0, key.Length);
+ }
+ }
+}
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