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120 lines
3.7 KiB
120 lines
3.7 KiB
namespace com.hitrust.b2b.Security.Cryptography
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{
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using com.hitrust.b2b.Security;
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using System;
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using System.Security.Cryptography;
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internal class RC4UnmanagedTransform : ICryptoTransform, IDisposable
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{
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private SymmetricKey m_Key;
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public RC4UnmanagedTransform(byte[] key)
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{
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this.m_Key = new SymmetricKey(CryptoProvider.RsaFull, CryptoAlgorithm.RC4, key);
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}
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public void Dispose()
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{
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if (this.m_Key != null)
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{
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this.m_Key.Dispose();
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this.m_Key = null;
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}
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try
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{
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GC.SuppressFinalize(this);
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}
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catch
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{
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}
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}
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~RC4UnmanagedTransform()
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{
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this.Dispose();
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}
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public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
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{
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if (this.m_Key == null)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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if ((inputBuffer == null) || (outputBuffer == null))
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{
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throw new ArgumentNullException();
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}
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if (((inputCount < 0) || (inputOffset < 0)) || (((outputOffset < 0) || ((inputOffset + inputCount) > inputBuffer.Length)) || ((outputBuffer.Length - outputOffset) < inputCount)))
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{
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throw new ArgumentOutOfRangeException();
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}
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byte[] destinationArray = new byte[inputCount];
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int length = destinationArray.Length;
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Array.Copy(inputBuffer, inputOffset, destinationArray, 0, length);
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if (SspiProvider.CryptEncrypt(this.m_Key.Handle, 0, 0, 0, destinationArray, ref length, length) == 0)
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{
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throw new CryptographicException("Could not transform data.");
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}
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Array.Copy(destinationArray, 0, outputBuffer, outputOffset, length);
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Array.Clear(destinationArray, 0, destinationArray.Length);
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return length;
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}
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public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
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{
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if (this.m_Key == null)
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{
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throw new ObjectDisposedException(base.GetType().FullName);
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}
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if (inputBuffer == null)
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{
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throw new ArgumentNullException();
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}
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if (((inputCount < 0) || (inputOffset < 0)) || ((inputOffset + inputCount) > inputBuffer.Length))
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{
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throw new ArgumentOutOfRangeException();
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}
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byte[] destinationArray = new byte[inputCount];
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int length = destinationArray.Length;
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Array.Copy(inputBuffer, inputOffset, destinationArray, 0, length);
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if (SspiProvider.CryptEncrypt(this.m_Key.Handle, 0, 1, 0, destinationArray, ref length, length) == 0)
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{
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throw new CryptographicException("Could not transform data.");
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}
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return destinationArray;
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}
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public bool CanReuseTransform
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{
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get
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{
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return true;
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}
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}
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public bool CanTransformMultipleBlocks
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{
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get
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{
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return true;
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}
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}
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public int InputBlockSize
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{
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get
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{
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return 1;
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}
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}
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public int OutputBlockSize
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{
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get
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{
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return 1;
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}
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}
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}
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}
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