diff options
Diffstat (limited to 'crypto/src/crypto/BufferedIesCipher.cs')
-rw-r--r-- | crypto/src/crypto/BufferedIesCipher.cs | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/crypto/src/crypto/BufferedIesCipher.cs b/crypto/src/crypto/BufferedIesCipher.cs new file mode 100644 index 000000000..6dab4ae33 --- /dev/null +++ b/crypto/src/crypto/BufferedIesCipher.cs @@ -0,0 +1,113 @@ +using System; +using System.IO; + +using Org.BouncyCastle.Crypto.Engines; +using Org.BouncyCastle.Crypto.Parameters; +using Org.BouncyCastle.Utilities; + +namespace Org.BouncyCastle.Crypto +{ + public class BufferedIesCipher + : BufferedCipherBase + { + private readonly IesEngine engine; + private bool forEncryption; + private MemoryStream buffer = new MemoryStream(); + + public BufferedIesCipher( + IesEngine engine) + { + if (engine == null) + throw new ArgumentNullException("engine"); + + this.engine = engine; + } + + public override string AlgorithmName + { + // TODO Create IESEngine.AlgorithmName + get { return "IES"; } + } + + public override void Init( + bool forEncryption, + ICipherParameters parameters) + { + this.forEncryption = forEncryption; + + // TODO + throw Platform.CreateNotImplementedException("IES"); + } + + public override int GetBlockSize() + { + return 0; + } + + public override int GetOutputSize( + int inputLen) + { + if (engine == null) + throw new InvalidOperationException("cipher not initialised"); + + int baseLen = inputLen + (int) buffer.Length; + return forEncryption + ? baseLen + 20 + : baseLen - 20; + } + + public override int GetUpdateOutputSize( + int inputLen) + { + return 0; + } + + public override byte[] ProcessByte( + byte input) + { + buffer.WriteByte(input); + return null; + } + + public override byte[] ProcessBytes( + byte[] input, + int inOff, + int length) + { + if (input == null) + throw new ArgumentNullException("input"); + if (inOff < 0) + throw new ArgumentException("inOff"); + if (length < 0) + throw new ArgumentException("length"); + if (inOff + length > input.Length) + throw new ArgumentException("invalid offset/length specified for input array"); + + buffer.Write(input, inOff, length); + return null; + } + + public override byte[] DoFinal() + { + byte[] buf = buffer.ToArray(); + + Reset(); + + return engine.ProcessBlock(buf, 0, buf.Length); + } + + public override byte[] DoFinal( + byte[] input, + int inOff, + int length) + { + ProcessBytes(input, inOff, length); + return DoFinal(); + } + + public override void Reset() + { + buffer.SetLength(0); + } + } +} |