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Andrey K. Choi
2025-10-09 09:57:24 +09:00
commit 4d551bd74f
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194
output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Modes/OpenPgpCfbBlockCipher.cs Normal file
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using System;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Crypto.Modes;
public class OpenPgpCfbBlockCipher : IBlockCipher
{
private byte[] IV;
private byte[] FR;
private byte[] FRE;
private readonly IBlockCipher cipher;
private readonly int blockSize;
private int count;
private bool forEncryption;
public string AlgorithmName => cipher.AlgorithmName + "/OpenPGPCFB";
public bool IsPartialBlockOkay => true;
public OpenPgpCfbBlockCipher(IBlockCipher cipher)
{
this.cipher = cipher;
blockSize = cipher.GetBlockSize();
IV = new byte[blockSize];
FR = new byte[blockSize];
FRE = new byte[blockSize];
}
public IBlockCipher GetUnderlyingCipher()
{
return cipher;
}
public int GetBlockSize()
{
return cipher.GetBlockSize();
}
public int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff)
{
if (!forEncryption)
{
return DecryptBlock(input, inOff, output, outOff);
}
return EncryptBlock(input, inOff, output, outOff);
}
public void Reset()
{
count = 0;
Array.Copy(IV, 0, FR, 0, FR.Length);
cipher.Reset();
}
public void Init(bool forEncryption, ICipherParameters parameters)
{
this.forEncryption = forEncryption;
if (parameters is ParametersWithIV)
{
ParametersWithIV parametersWithIV = (ParametersWithIV)parameters;
byte[] iV = parametersWithIV.GetIV();
if (iV.Length < IV.Length)
{
Array.Copy(iV, 0, IV, IV.Length - iV.Length, iV.Length);
for (int i = 0; i < IV.Length - iV.Length; i++)
{
IV[i] = 0;
}
}
else
{
Array.Copy(iV, 0, IV, 0, IV.Length);
}
parameters = parametersWithIV.Parameters;
}
Reset();
cipher.Init(forEncryption: true, parameters);
}
private byte EncryptByte(byte data, int blockOff)
{
return (byte)(FRE[blockOff] ^ data);
}
private int EncryptBlock(byte[] input, int inOff, byte[] outBytes, int outOff)
{
if (inOff + blockSize > input.Length)
{
throw new DataLengthException("input buffer too short");
}
if (outOff + blockSize > outBytes.Length)
{
throw new DataLengthException("output buffer too short");
}
if (count > blockSize)
{
FR[blockSize - 2] = (outBytes[outOff] = EncryptByte(input[inOff], blockSize - 2));
FR[blockSize - 1] = (outBytes[outOff + 1] = EncryptByte(input[inOff + 1], blockSize - 1));
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int i = 2; i < blockSize; i++)
{
FR[i - 2] = (outBytes[outOff + i] = EncryptByte(input[inOff + i], i - 2));
}
}
else if (count == 0)
{
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int j = 0; j < blockSize; j++)
{
FR[j] = (outBytes[outOff + j] = EncryptByte(input[inOff + j], j));
}
count += blockSize;
}
else if (count == blockSize)
{
cipher.ProcessBlock(FR, 0, FRE, 0);
outBytes[outOff] = EncryptByte(input[inOff], 0);
outBytes[outOff + 1] = EncryptByte(input[inOff + 1], 1);
Array.Copy(FR, 2, FR, 0, blockSize - 2);
Array.Copy(outBytes, outOff, FR, blockSize - 2, 2);
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int k = 2; k < blockSize; k++)
{
FR[k - 2] = (outBytes[outOff + k] = EncryptByte(input[inOff + k], k - 2));
}
count += blockSize;
}
return blockSize;
}
private int DecryptBlock(byte[] input, int inOff, byte[] outBytes, int outOff)
{
if (inOff + blockSize > input.Length)
{
throw new DataLengthException("input buffer too short");
}
if (outOff + blockSize > outBytes.Length)
{
throw new DataLengthException("output buffer too short");
}
if (count > blockSize)
{
byte b = input[inOff];
FR[blockSize - 2] = b;
outBytes[outOff] = EncryptByte(b, blockSize - 2);
b = input[inOff + 1];
FR[blockSize - 1] = b;
outBytes[outOff + 1] = EncryptByte(b, blockSize - 1);
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int i = 2; i < blockSize; i++)
{
b = input[inOff + i];
FR[i - 2] = b;
outBytes[outOff + i] = EncryptByte(b, i - 2);
}
}
else if (count == 0)
{
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int j = 0; j < blockSize; j++)
{
FR[j] = input[inOff + j];
outBytes[j] = EncryptByte(input[inOff + j], j);
}
count += blockSize;
}
else if (count == blockSize)
{
cipher.ProcessBlock(FR, 0, FRE, 0);
byte b2 = input[inOff];
byte b3 = input[inOff + 1];
outBytes[outOff] = EncryptByte(b2, 0);
outBytes[outOff + 1] = EncryptByte(b3, 1);
Array.Copy(FR, 2, FR, 0, blockSize - 2);
FR[blockSize - 2] = b2;
FR[blockSize - 1] = b3;
cipher.ProcessBlock(FR, 0, FRE, 0);
for (int k = 2; k < blockSize; k++)
{
byte b4 = input[inOff + k];
FR[k - 2] = b4;
outBytes[outOff + k] = EncryptByte(b4, k - 2);
}
count += blockSize;
}
return blockSize;
}
}