diff --git a/Crypto/src/crypto/BufferedCipherBase.cs b/Crypto/src/crypto/BufferedCipherBase.cs
new file mode 100644
index 000000000..9d8610211
--- /dev/null
+++ b/Crypto/src/crypto/BufferedCipherBase.cs
@@ -0,0 +1,113 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto
+{
+ public abstract class BufferedCipherBase
+ : IBufferedCipher
+ {
+ protected static readonly byte[] EmptyBuffer = new byte[0];
+
+ public abstract string AlgorithmName { get; }
+
+ public abstract void Init(bool forEncryption, ICipherParameters parameters);
+
+ public abstract int GetBlockSize();
+
+ public abstract int GetOutputSize(int inputLen);
+ public abstract int GetUpdateOutputSize(int inputLen);
+
+ public abstract byte[] ProcessByte(byte input);
+
+ public virtual int ProcessByte(
+ byte input,
+ byte[] output,
+ int outOff)
+ {
+ byte[] outBytes = ProcessByte(input);
+ if (outBytes == null)
+ return 0;
+ if (outOff + outBytes.Length > output.Length)
+ throw new DataLengthException("output buffer too short");
+ outBytes.CopyTo(output, outOff);
+ return outBytes.Length;
+ }
+
+ public virtual byte[] ProcessBytes(
+ byte[] input)
+ {
+ return ProcessBytes(input, 0, input.Length);
+ }
+
+ public abstract byte[] ProcessBytes(byte[] input, int inOff, int length);
+
+ public virtual int ProcessBytes(
+ byte[] input,
+ byte[] output,
+ int outOff)
+ {
+ return ProcessBytes(input, 0, input.Length, output, outOff);
+ }
+
+ public virtual int ProcessBytes(
+ byte[] input,
+ int inOff,
+ int length,
+ byte[] output,
+ int outOff)
+ {
+ byte[] outBytes = ProcessBytes(input, inOff, length);
+ if (outBytes == null)
+ return 0;
+ if (outOff + outBytes.Length > output.Length)
+ throw new DataLengthException("output buffer too short");
+ outBytes.CopyTo(output, outOff);
+ return outBytes.Length;
+ }
+
+ public abstract byte[] DoFinal();
+
+ public virtual byte[] DoFinal(
+ byte[] input)
+ {
+ return DoFinal(input, 0, input.Length);
+ }
+
+ public abstract byte[] DoFinal(
+ byte[] input,
+ int inOff,
+ int length);
+
+ public virtual int DoFinal(
+ byte[] output,
+ int outOff)
+ {
+ byte[] outBytes = DoFinal();
+ if (outOff + outBytes.Length > output.Length)
+ throw new DataLengthException("output buffer too short");
+ outBytes.CopyTo(output, outOff);
+ return outBytes.Length;
+ }
+
+ public virtual int DoFinal(
+ byte[] input,
+ byte[] output,
+ int outOff)
+ {
+ return DoFinal(input, 0, input.Length, output, outOff);
+ }
+
+ public virtual int DoFinal(
+ byte[] input,
+ int inOff,
+ int length,
+ byte[] output,
+ int outOff)
+ {
+ int len = ProcessBytes(input, inOff, length, output, outOff);
+ len += DoFinal(output, outOff + len);
+ return len;
+ }
+
+ public abstract void Reset();
+ }
+}
|
