init commit

2025-10-09 09:57:24 +09:00
commit 4d551bd74f
6636 changed files with 1218703 additions and 0 deletions
--- a/output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Modes/GOfbBlockCipher.cs
+++ b/output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Modes/GOfbBlockCipher.cs
@@ -0,0 +1,138 @@
+using System;
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace Org.BouncyCastle.Crypto.Modes;
+
+public class GOfbBlockCipher : IBlockCipher
+{
+	private const int C1 = 16843012;
+
+	private const int C2 = 16843009;
+
+	private byte[] IV;
+
+	private byte[] ofbV;
+
+	private byte[] ofbOutV;
+
+	private readonly int blockSize;
+
+	private readonly IBlockCipher cipher;
+
+	private bool firstStep = true;
+
+	private int N3;
+
+	private int N4;
+
+	public string AlgorithmName => cipher.AlgorithmName + "/GCTR";
+
+	public bool IsPartialBlockOkay => true;
+
+	public GOfbBlockCipher(IBlockCipher cipher)
+	{
+		this.cipher = cipher;
+		blockSize = cipher.GetBlockSize();
+		if (blockSize != 8)
+		{
+			throw new ArgumentException("GCTR only for 64 bit block ciphers");
+		}
+		IV = new byte[cipher.GetBlockSize()];
+		ofbV = new byte[cipher.GetBlockSize()];
+		ofbOutV = new byte[cipher.GetBlockSize()];
+	}
+
+	public IBlockCipher GetUnderlyingCipher()
+	{
+		return cipher;
+	}
+
+	public void Init(bool forEncryption, ICipherParameters parameters)
+	{
+		firstStep = true;
+		N3 = 0;
+		N4 = 0;
+		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();
+		if (parameters != null)
+		{
+			cipher.Init(forEncryption: true, parameters);
+		}
+	}
+
+	public int GetBlockSize()
+	{
+		return blockSize;
+	}
+
+	public int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff)
+	{
+		if (inOff + blockSize > input.Length)
+		{
+			throw new DataLengthException("input buffer too short");
+		}
+		if (outOff + blockSize > output.Length)
+		{
+			throw new DataLengthException("output buffer too short");
+		}
+		if (firstStep)
+		{
+			firstStep = false;
+			cipher.ProcessBlock(ofbV, 0, ofbOutV, 0);
+			N3 = bytesToint(ofbOutV, 0);
+			N4 = bytesToint(ofbOutV, 4);
+		}
+		N3 += 16843009;
+		N4 += 16843012;
+		if (N4 < 16843012 && N4 > 0)
+		{
+			N4++;
+		}
+		intTobytes(N3, ofbV, 0);
+		intTobytes(N4, ofbV, 4);
+		cipher.ProcessBlock(ofbV, 0, ofbOutV, 0);
+		for (int i = 0; i < blockSize; i++)
+		{
+			output[outOff + i] = (byte)(ofbOutV[i] ^ input[inOff + i]);
+		}
+		Array.Copy(ofbV, blockSize, ofbV, 0, ofbV.Length - blockSize);
+		Array.Copy(ofbOutV, 0, ofbV, ofbV.Length - blockSize, blockSize);
+		return blockSize;
+	}
+
+	public void Reset()
+	{
+		Array.Copy(IV, 0, ofbV, 0, IV.Length);
+		cipher.Reset();
+	}
+
+	private int bytesToint(byte[] inBytes, int inOff)
+	{
+		return (int)((inBytes[inOff + 3] << 24) & 0xFF000000u) + ((inBytes[inOff + 2] << 16) & 0xFF0000) + ((inBytes[inOff + 1] << 8) & 0xFF00) + (inBytes[inOff] & 0xFF);
+	}
+
+	private void intTobytes(int num, byte[] outBytes, int outOff)
+	{
+		outBytes[outOff + 3] = (byte)(num >> 24);
+		outBytes[outOff + 2] = (byte)(num >> 16);
+		outBytes[outOff + 1] = (byte)(num >> 8);
+		outBytes[outOff] = (byte)num;
+	}
+}