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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/modes/CfbBlockCipher.cs
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230
Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/modes/CfbBlockCipher.cs
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Modes
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{
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/**
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* implements a Cipher-FeedBack (CFB) mode on top of a simple cipher.
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*/
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public class CfbBlockCipher
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: IBlockCipherMode
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{
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private byte[] IV;
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private byte[] cfbV;
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private byte[] cfbOutV;
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private bool encrypting;
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private readonly int blockSize;
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private readonly IBlockCipher cipher;
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/**
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* Basic constructor.
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*
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* @param cipher the block cipher to be used as the basis of the
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* feedback mode.
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* @param blockSize the block size in bits (note: a multiple of 8)
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*/
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public CfbBlockCipher(
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IBlockCipher cipher,
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int bitBlockSize)
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{
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if (bitBlockSize < 8 || (bitBlockSize & 7) != 0)
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throw new ArgumentException("CFB" + bitBlockSize + " not supported", "bitBlockSize");
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this.cipher = cipher;
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this.blockSize = bitBlockSize / 8;
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this.IV = new byte[cipher.GetBlockSize()];
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this.cfbV = new byte[cipher.GetBlockSize()];
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this.cfbOutV = new byte[cipher.GetBlockSize()];
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}
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/**
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* return the underlying block cipher that we are wrapping.
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*
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* @return the underlying block cipher that we are wrapping.
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*/
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public IBlockCipher UnderlyingCipher => cipher;
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/**
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* Initialise the cipher and, possibly, the initialisation vector (IV).
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* If an IV isn't passed as part of the parameter, the IV will be all zeros.
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* An IV which is too short is handled in FIPS compliant fashion.
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*
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* @param forEncryption if true the cipher is initialised for
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* encryption, if false for decryption.
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* @param param the key and other data required by the cipher.
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* @exception ArgumentException if the parameters argument is
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* inappropriate.
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*/
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public void Init(
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bool forEncryption,
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ICipherParameters parameters)
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{
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this.encrypting = forEncryption;
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if (parameters is ParametersWithIV)
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{
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ParametersWithIV ivParam = (ParametersWithIV) parameters;
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byte[] iv = ivParam.GetIV();
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int diff = IV.Length - iv.Length;
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Array.Copy(iv, 0, IV, diff, iv.Length);
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Array.Clear(IV, 0, diff);
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parameters = ivParam.Parameters;
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}
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Reset();
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// if it's null, key is to be reused.
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if (parameters != null)
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{
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cipher.Init(true, parameters);
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}
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}
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/**
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* return the algorithm name and mode.
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*
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* @return the name of the underlying algorithm followed by "/CFB"
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* and the block size in bits.
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*/
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public string AlgorithmName
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{
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get { return cipher.AlgorithmName + "/CFB" + (blockSize * 8); }
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}
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public bool IsPartialBlockOkay
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{
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get { return true; }
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}
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/**
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* return the block size we are operating at.
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*
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* @return the block size we are operating at (in bytes).
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*/
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public int GetBlockSize()
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{
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return blockSize;
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}
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public int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff)
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{
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
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return encrypting
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? EncryptBlock(input.AsSpan(inOff), output.AsSpan(outOff))
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: DecryptBlock(input.AsSpan(inOff), output.AsSpan(outOff));
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#else
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return encrypting
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? EncryptBlock(input, inOff, output, outOff)
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: DecryptBlock(input, inOff, output, outOff);
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#endif
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
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public int ProcessBlock(ReadOnlySpan<byte> input, Span<byte> output)
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{
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return encrypting
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? EncryptBlock(input, output)
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: DecryptBlock(input, output);
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}
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#endif
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
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private int EncryptBlock(ReadOnlySpan<byte> input, Span<byte> output)
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{
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Check.DataLength(input, blockSize, "input buffer too short");
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Check.OutputLength(output, blockSize, "output buffer too short");
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cipher.ProcessBlock(cfbV, cfbOutV);
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//
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// XOR the cfbV with the plaintext producing the ciphertext
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//
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for (int i = 0; i < blockSize; i++)
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{
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output[i] = (byte)(cfbOutV[i] ^ input[i]);
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}
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//
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// change over the input block.
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//
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Array.Copy(cfbV, blockSize, cfbV, 0, cfbV.Length - blockSize);
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output[..blockSize].CopyTo(cfbV.AsSpan(cfbV.Length - blockSize));
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return blockSize;
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}
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private int DecryptBlock(ReadOnlySpan<byte> input, Span<byte> output)
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{
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Check.DataLength(input, blockSize, "input buffer too short");
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Check.OutputLength(output, blockSize, "output buffer too short");
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cipher.ProcessBlock(cfbV, 0, cfbOutV, 0);
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//
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// change over the input block.
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//
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Array.Copy(cfbV, blockSize, cfbV, 0, cfbV.Length - blockSize);
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input[..blockSize].CopyTo(cfbV.AsSpan(cfbV.Length - blockSize));
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//
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// XOR the cfbV with the ciphertext producing the plaintext
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//
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for (int i = 0; i < blockSize; i++)
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{
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output[i] = (byte)(cfbOutV[i] ^ input[i]);
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}
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return blockSize;
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}
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#else
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private int EncryptBlock(byte[] input, int inOff, byte[] outBytes, int outOff)
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{
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Check.DataLength(input, inOff, blockSize, "input buffer too short");
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Check.OutputLength(outBytes, outOff, blockSize, "output buffer too short");
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cipher.ProcessBlock(cfbV, 0, cfbOutV, 0);
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//
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// XOR the cfbV with the plaintext producing the ciphertext
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//
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for (int i = 0; i < blockSize; i++)
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{
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outBytes[outOff + i] = (byte)(cfbOutV[i] ^ input[inOff + i]);
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}
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//
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// change over the input block.
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//
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Array.Copy(cfbV, blockSize, cfbV, 0, cfbV.Length - blockSize);
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Array.Copy(outBytes, outOff, cfbV, cfbV.Length - blockSize, blockSize);
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return blockSize;
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}
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private int DecryptBlock(byte[] input, int inOff, byte[] outBytes, int outOff)
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{
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Check.DataLength(input, inOff, blockSize, "input buffer too short");
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Check.OutputLength(outBytes, outOff, blockSize, "output buffer too short");
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cipher.ProcessBlock(cfbV, 0, cfbOutV, 0);
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//
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// change over the input block.
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//
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Array.Copy(cfbV, blockSize, cfbV, 0, cfbV.Length - blockSize);
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Array.Copy(input, inOff, cfbV, cfbV.Length - blockSize, blockSize);
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//
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// XOR the cfbV with the ciphertext producing the plaintext
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//
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for (int i = 0; i < blockSize; i++)
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{
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outBytes[outOff + i] = (byte)(cfbOutV[i] ^ input[inOff + i]);
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}
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return blockSize;
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}
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#endif
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/**
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* reset the chaining vector back to the IV and reset the underlying
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* cipher.
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*/
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public void Reset()
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{
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Array.Copy(IV, 0, cfbV, 0, IV.Length);
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}
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}
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}
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#pragma warning restore
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#endif
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