diff --git a/crypto/src/crypto/parameters/KDFFeedbackParameters.cs b/crypto/src/crypto/parameters/KDFFeedbackParameters.cs
new file mode 100644
index 000000000..87187dbdb
--- /dev/null
+++ b/crypto/src/crypto/parameters/KDFFeedbackParameters.cs
@@ -0,0 +1,91 @@
+using System;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Parameters
+{
+ public class KDFFeedbackParameters : IDerivationParameters
+ {
+ // could be any valid value, using 32, don't know why
+ private static readonly int UNUSED_R = -1;
+
+ private readonly byte[] ki;
+ private readonly byte[] iv;
+ private readonly bool useCounter;
+ private readonly int r;
+ private readonly byte[] fixedInputData;
+
+ private KDFFeedbackParameters(byte[] ki, byte[] iv, byte[] fixedInputData, int r, bool useCounter)
+ {
+ if (ki == null)
+ {
+ throw new ArgumentException("A KDF requires Ki (a seed) as input");
+ }
+
+ this.ki = Arrays.Clone(ki);
+
+ if (fixedInputData == null)
+ {
+ this.fixedInputData = new byte[0];
+ }
+ else
+ {
+ this.fixedInputData = Arrays.Clone(fixedInputData);
+ }
+
+ this.r = r;
+
+ if (iv == null)
+ {
+ this.iv = new byte[0];
+ }
+ else
+ {
+ this.iv = Arrays.Clone(iv);
+ }
+
+ this.useCounter = useCounter;
+ }
+
+ public static KDFFeedbackParameters CreateWithCounter(
+ byte[] ki, byte[] iv, byte[] fixedInputData, int r)
+ {
+ if (r != 8 && r != 16 && r != 24 && r != 32)
+ {
+ throw new ArgumentException("Length of counter should be 8, 16, 24 or 32");
+ }
+
+ return new KDFFeedbackParameters(ki, iv, fixedInputData, r, true);
+ }
+
+ public static KDFFeedbackParameters CreateWithoutCounter(
+ byte[] ki, byte[] iv, byte[] fixedInputData)
+ {
+ return new KDFFeedbackParameters(ki, iv, fixedInputData, UNUSED_R, false);
+ }
+
+ public byte[] Ki
+ {
+ get { return Arrays.Clone(ki); }
+ }
+
+ public byte[] Iv
+ {
+ get { return Arrays.Clone(iv); }
+ }
+
+ public bool UseCounter
+ {
+ get { return useCounter; }
+ }
+
+ public int R
+ {
+ get { return r; }
+ }
+
+ public byte[] FixedInputData
+ {
+ get { return Arrays.Clone(fixedInputData); }
+ }
+ }
+}
\ No newline at end of file
|
