1 files changed, 70 insertions, 0 deletions
diff --git a/Crypto/src/crypto/engines/NullEngine.cs b/Crypto/src/crypto/engines/NullEngine.cs
new file mode 100644
index 000000000..407b8ccc6
--- /dev/null
+++ b/Crypto/src/crypto/engines/NullEngine.cs
@@ -0,0 +1,70 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace Org.BouncyCastle.Crypto.Engines
+{
+ /**
+ * The no-op engine that just copies bytes through, irrespective of whether encrypting and decrypting.
+ * Provided for the sake of completeness.
+ */
+ public class NullEngine
+ : IBlockCipher
+ {
+ private bool initialised;
+ private const int BlockSize = 1;
+
+ public NullEngine()
+ {
+ }
+
+ public void Init(
+ bool forEncryption,
+ ICipherParameters parameters)
+ {
+ // we don't mind any parameters that may come in
+ initialised = true;
+ }
+
+ public string AlgorithmName
+ {
+ get { return "Null"; }
+ }
+
+ public bool IsPartialBlockOkay
+ {
+ get { return true; }
+ }
+
+ public int GetBlockSize()
+ {
+ return BlockSize;
+ }
+
+ public int ProcessBlock(
+ byte[] input,
+ int inOff,
+ byte[] output,
+ int outOff)
+ {
+ if (!initialised)
+ throw new InvalidOperationException("Null engine not initialised");
+ if ((inOff + BlockSize) > input.Length)
+ throw new DataLengthException("input buffer too short");
+ if ((outOff + BlockSize) > output.Length)
+ throw new DataLengthException("output buffer too short");
+
+ for (int i = 0; i < BlockSize; ++i)
+ {
+ output[outOff + i] = input[inOff + i];
+ }
+
+ return BlockSize;
+ }
+
+ public void Reset()
+ {
+ // nothing needs to be done
+ }
+ }
+}
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