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- #if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
- #pragma warning disable
- using System;
- using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Modes;
- namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto
- {
- /**
- * a wrapper for block ciphers with a single byte block size, so that they
- * can be treated like stream ciphers.
- */
- public class StreamBlockCipher
- : IStreamCipher
- {
- private readonly IBlockCipherMode m_cipherMode;
- private readonly byte[] oneByte = new byte[1];
- /**
- * basic constructor.
- *
- * @param cipher the block cipher to be wrapped.
- * @exception ArgumentException if the cipher has a block size other than
- * one.
- */
- public StreamBlockCipher(IBlockCipherMode cipherMode)
- {
- if (cipherMode == null)
- throw new ArgumentNullException(nameof(cipherMode));
- if (cipherMode.GetBlockSize() != 1)
- throw new ArgumentException("block cipher block size != 1.", nameof(cipherMode));
- m_cipherMode = cipherMode;
- }
- /**
- * initialise the underlying cipher.
- *
- * @param forEncryption true if we are setting up for encryption, false otherwise.
- * @param param the necessary parameters for the underlying cipher to be initialised.
- */
- public void Init(bool forEncryption, ICipherParameters parameters)
- {
- m_cipherMode.Init(forEncryption, parameters);
- }
- /**
- * return the name of the algorithm we are wrapping.
- *
- * @return the name of the algorithm we are wrapping.
- */
- public string AlgorithmName
- {
- get { return m_cipherMode.AlgorithmName; }
- }
- /**
- * encrypt/decrypt a single byte returning the result.
- *
- * @param in the byte to be processed.
- * @return the result of processing the input byte.
- */
- public byte ReturnByte(byte input)
- {
- oneByte[0] = input;
- m_cipherMode.ProcessBlock(oneByte, 0, oneByte, 0);
- return oneByte[0];
- }
- /**
- * process a block of bytes from in putting the result into out.
- *
- * @param in the input byte array.
- * @param inOff the offset into the in array where the data to be processed starts.
- * @param len the number of bytes to be processed.
- * @param out the output buffer the processed bytes go into.
- * @param outOff the offset into the output byte array the processed data stars at.
- * @exception DataLengthException if the output buffer is too small.
- */
- public void ProcessBytes(byte[] input, int inOff, int length, byte[] output, int outOff)
- {
- Check.DataLength(input, inOff, length, "input buffer too short");
- Check.OutputLength(output, outOff, length, "output buffer too short");
- for (int i = 0; i != length; i++)
- {
- m_cipherMode.ProcessBlock(input, inOff + i, output, outOff + i);
- }
- }
- #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
- public virtual void ProcessBytes(ReadOnlySpan<byte> input, Span<byte> output)
- {
- Check.OutputLength(output, input.Length, "output buffer too short");
- for (int i = 0; i != input.Length; i++)
- {
- m_cipherMode.ProcessBlock(input[i..], output[i..]);
- }
- }
- #endif
- /**
- * reset the underlying cipher. This leaves it in the same state
- * it was at after the last init (if there was one).
- */
- public void Reset()
- {
- m_cipherMode.Reset();
- }
- }
- }
- #pragma warning restore
- #endif
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