niko
557 lines
15 KiB
C#
557 lines
15 KiB
C#
using System;
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using System.Security.Cryptography;
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namespace Mono.Security.Cryptography
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{
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// Token: 0x020000AE RID: 174
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internal abstract class SymmetricTransform : IDisposable, ICryptoTransform
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{
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// Token: 0x0600097D RID: 2429 RVA: 0x00026B2C File Offset: 0x00024D2C
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public SymmetricTransform(SymmetricAlgorithm symmAlgo, bool encryption, byte[] rgbIV)
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{
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this.algo = symmAlgo;
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this.encrypt = encryption;
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this.BlockSizeByte = this.algo.BlockSize >> 3;
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if (rgbIV == null)
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{
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rgbIV = KeyBuilder.IV(this.BlockSizeByte);
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}
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else
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{
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rgbIV = (byte[])rgbIV.Clone();
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}
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if (rgbIV.Length < this.BlockSizeByte)
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{
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string text = Locale.GetText("IV is too small ({0} bytes), it should be {1} bytes long.", new object[] { rgbIV.Length, this.BlockSizeByte });
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throw new CryptographicException(text);
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}
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this.temp = new byte[this.BlockSizeByte];
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Buffer.BlockCopy(rgbIV, 0, this.temp, 0, Math.Min(this.BlockSizeByte, rgbIV.Length));
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this.temp2 = new byte[this.BlockSizeByte];
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this.FeedBackByte = this.algo.FeedbackSize >> 3;
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if (this.FeedBackByte != 0)
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{
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this.FeedBackIter = this.BlockSizeByte / this.FeedBackByte;
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}
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this.workBuff = new byte[this.BlockSizeByte];
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this.workout = new byte[this.BlockSizeByte];
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}
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// Token: 0x0600097E RID: 2430 RVA: 0x00026C58 File Offset: 0x00024E58
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void IDisposable.Dispose()
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{
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this.Dispose(true);
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GC.SuppressFinalize(this);
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}
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// Token: 0x0600097F RID: 2431 RVA: 0x00026C68 File Offset: 0x00024E68
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~SymmetricTransform()
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{
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this.Dispose(false);
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}
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// Token: 0x06000980 RID: 2432 RVA: 0x00026CA4 File Offset: 0x00024EA4
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protected virtual void Dispose(bool disposing)
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{
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if (!this.m_disposed)
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{
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if (disposing)
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{
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Array.Clear(this.temp, 0, this.BlockSizeByte);
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this.temp = null;
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Array.Clear(this.temp2, 0, this.BlockSizeByte);
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this.temp2 = null;
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}
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this.m_disposed = true;
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}
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}
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// Token: 0x17000111 RID: 273
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// (get) Token: 0x06000981 RID: 2433 RVA: 0x00026CFC File Offset: 0x00024EFC
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public virtual 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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// Token: 0x17000112 RID: 274
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// (get) Token: 0x06000982 RID: 2434 RVA: 0x00026D00 File Offset: 0x00024F00
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public virtual bool CanReuseTransform
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{
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get
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{
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return false;
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}
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}
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// Token: 0x17000113 RID: 275
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// (get) Token: 0x06000983 RID: 2435 RVA: 0x00026D04 File Offset: 0x00024F04
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public virtual int InputBlockSize
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{
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get
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{
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return this.BlockSizeByte;
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}
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}
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// Token: 0x17000114 RID: 276
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// (get) Token: 0x06000984 RID: 2436 RVA: 0x00026D0C File Offset: 0x00024F0C
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public virtual int OutputBlockSize
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{
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get
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{
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return this.BlockSizeByte;
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}
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}
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// Token: 0x06000985 RID: 2437 RVA: 0x00026D14 File Offset: 0x00024F14
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protected virtual void Transform(byte[] input, byte[] output)
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{
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switch (this.algo.Mode)
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{
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case CipherMode.CBC:
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this.CBC(input, output);
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break;
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case CipherMode.ECB:
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this.ECB(input, output);
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break;
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case CipherMode.OFB:
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this.OFB(input, output);
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break;
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case CipherMode.CFB:
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this.CFB(input, output);
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break;
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case CipherMode.CTS:
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this.CTS(input, output);
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break;
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default:
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throw new NotImplementedException("Unkown CipherMode" + this.algo.Mode.ToString());
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}
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}
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// Token: 0x06000986 RID: 2438
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protected abstract void ECB(byte[] input, byte[] output);
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// Token: 0x06000987 RID: 2439 RVA: 0x00026DB4 File Offset: 0x00024FB4
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protected virtual void CBC(byte[] input, byte[] output)
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{
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if (this.encrypt)
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{
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for (int i = 0; i < this.BlockSizeByte; i++)
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{
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byte[] array = this.temp;
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int num = i;
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array[num] ^= input[i];
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}
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this.ECB(this.temp, output);
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Buffer.BlockCopy(output, 0, this.temp, 0, this.BlockSizeByte);
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}
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else
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{
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Buffer.BlockCopy(input, 0, this.temp2, 0, this.BlockSizeByte);
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this.ECB(input, output);
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for (int j = 0; j < this.BlockSizeByte; j++)
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{
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int num2 = j;
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output[num2] ^= this.temp[j];
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}
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Buffer.BlockCopy(this.temp2, 0, this.temp, 0, this.BlockSizeByte);
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}
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}
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// Token: 0x06000988 RID: 2440 RVA: 0x00026E80 File Offset: 0x00025080
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protected virtual void CFB(byte[] input, byte[] output)
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{
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if (this.encrypt)
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{
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for (int i = 0; i < this.FeedBackIter; i++)
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{
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this.ECB(this.temp, this.temp2);
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for (int j = 0; j < this.FeedBackByte; j++)
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{
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output[j + i] = this.temp2[j] ^ input[j + i];
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}
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Buffer.BlockCopy(this.temp, this.FeedBackByte, this.temp, 0, this.BlockSizeByte - this.FeedBackByte);
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Buffer.BlockCopy(output, i, this.temp, this.BlockSizeByte - this.FeedBackByte, this.FeedBackByte);
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}
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}
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else
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{
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for (int k = 0; k < this.FeedBackIter; k++)
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{
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this.encrypt = true;
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this.ECB(this.temp, this.temp2);
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this.encrypt = false;
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Buffer.BlockCopy(this.temp, this.FeedBackByte, this.temp, 0, this.BlockSizeByte - this.FeedBackByte);
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Buffer.BlockCopy(input, k, this.temp, this.BlockSizeByte - this.FeedBackByte, this.FeedBackByte);
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for (int l = 0; l < this.FeedBackByte; l++)
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{
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output[l + k] = this.temp2[l] ^ input[l + k];
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}
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}
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}
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}
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// Token: 0x06000989 RID: 2441 RVA: 0x00026FE0 File Offset: 0x000251E0
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protected virtual void OFB(byte[] input, byte[] output)
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{
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throw new CryptographicException("OFB isn't supported by the framework");
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}
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// Token: 0x0600098A RID: 2442 RVA: 0x00026FEC File Offset: 0x000251EC
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protected virtual void CTS(byte[] input, byte[] output)
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{
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throw new CryptographicException("CTS isn't supported by the framework");
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}
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// Token: 0x0600098B RID: 2443 RVA: 0x00026FF8 File Offset: 0x000251F8
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private void CheckInput(byte[] inputBuffer, int inputOffset, int inputCount)
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{
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if (inputBuffer == null)
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{
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throw new ArgumentNullException("inputBuffer");
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}
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if (inputOffset < 0)
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{
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throw new ArgumentOutOfRangeException("inputOffset", "< 0");
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}
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if (inputCount < 0)
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{
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throw new ArgumentOutOfRangeException("inputCount", "< 0");
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}
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if (inputOffset > inputBuffer.Length - inputCount)
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{
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throw new ArgumentException("inputBuffer", Locale.GetText("Overflow"));
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}
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}
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// Token: 0x0600098C RID: 2444 RVA: 0x00027064 File Offset: 0x00025264
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public virtual int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
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{
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if (this.m_disposed)
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{
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throw new ObjectDisposedException("Object is disposed");
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}
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this.CheckInput(inputBuffer, inputOffset, inputCount);
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if (outputBuffer == null)
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{
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throw new ArgumentNullException("outputBuffer");
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}
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if (outputOffset < 0)
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{
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throw new ArgumentOutOfRangeException("outputOffset", "< 0");
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}
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int num = outputBuffer.Length - inputCount - outputOffset;
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if (!this.encrypt && 0 > num && (this.algo.Padding == PaddingMode.None || this.algo.Padding == PaddingMode.Zeros))
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{
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throw new CryptographicException("outputBuffer", Locale.GetText("Overflow"));
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}
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if (this.KeepLastBlock)
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{
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if (0 > num + this.BlockSizeByte)
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{
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throw new CryptographicException("outputBuffer", Locale.GetText("Overflow"));
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}
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}
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else if (0 > num)
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{
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if (inputBuffer.Length - inputOffset - outputBuffer.Length != this.BlockSizeByte)
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{
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throw new CryptographicException("outputBuffer", Locale.GetText("Overflow"));
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}
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inputCount = outputBuffer.Length - outputOffset;
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}
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return this.InternalTransformBlock(inputBuffer, inputOffset, inputCount, outputBuffer, outputOffset);
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}
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// Token: 0x17000115 RID: 277
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// (get) Token: 0x0600098D RID: 2445 RVA: 0x0002718C File Offset: 0x0002538C
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private bool KeepLastBlock
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{
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get
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{
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return !this.encrypt && this.algo.Padding != PaddingMode.None && this.algo.Padding != PaddingMode.Zeros;
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}
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}
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// Token: 0x0600098E RID: 2446 RVA: 0x000271CC File Offset: 0x000253CC
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private int InternalTransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
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{
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int num = inputOffset;
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int num2;
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if (inputCount != this.BlockSizeByte)
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{
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if (inputCount % this.BlockSizeByte != 0)
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{
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throw new CryptographicException("Invalid input block size.");
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}
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num2 = inputCount / this.BlockSizeByte;
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}
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else
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{
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num2 = 1;
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}
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if (this.KeepLastBlock)
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{
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num2--;
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}
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int num3 = 0;
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if (this.lastBlock)
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{
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this.Transform(this.workBuff, this.workout);
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Buffer.BlockCopy(this.workout, 0, outputBuffer, outputOffset, this.BlockSizeByte);
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outputOffset += this.BlockSizeByte;
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num3 += this.BlockSizeByte;
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this.lastBlock = false;
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}
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for (int i = 0; i < num2; i++)
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{
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Buffer.BlockCopy(inputBuffer, num, this.workBuff, 0, this.BlockSizeByte);
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this.Transform(this.workBuff, this.workout);
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Buffer.BlockCopy(this.workout, 0, outputBuffer, outputOffset, this.BlockSizeByte);
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num += this.BlockSizeByte;
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outputOffset += this.BlockSizeByte;
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num3 += this.BlockSizeByte;
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}
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if (this.KeepLastBlock)
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{
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Buffer.BlockCopy(inputBuffer, num, this.workBuff, 0, this.BlockSizeByte);
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this.lastBlock = true;
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}
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return num3;
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}
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// Token: 0x0600098F RID: 2447 RVA: 0x00027300 File Offset: 0x00025500
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private void Random(byte[] buffer, int start, int length)
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{
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if (this._rng == null)
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{
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this._rng = RandomNumberGenerator.Create();
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}
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byte[] array = new byte[length];
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this._rng.GetBytes(array);
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Buffer.BlockCopy(array, 0, buffer, start, length);
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}
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// Token: 0x06000990 RID: 2448 RVA: 0x00027340 File Offset: 0x00025540
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private void ThrowBadPaddingException(PaddingMode padding, int length, int position)
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{
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string text = string.Format(Locale.GetText("Bad {0} padding."), padding);
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if (length >= 0)
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{
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text += string.Format(Locale.GetText(" Invalid length {0}."), length);
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}
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if (position >= 0)
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{
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text += string.Format(Locale.GetText(" Error found at position {0}."), position);
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}
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throw new CryptographicException(text);
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}
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// Token: 0x06000991 RID: 2449 RVA: 0x000273B0 File Offset: 0x000255B0
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private byte[] FinalEncrypt(byte[] inputBuffer, int inputOffset, int inputCount)
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{
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int num = inputCount / this.BlockSizeByte * this.BlockSizeByte;
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int num2 = inputCount - num;
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int i = num;
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switch (this.algo.Padding)
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{
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case PaddingMode.PKCS7:
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case PaddingMode.ANSIX923:
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case PaddingMode.ISO10126:
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i += this.BlockSizeByte;
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goto IL_A8;
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}
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if (inputCount == 0)
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{
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return new byte[0];
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}
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if (num2 != 0)
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{
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if (this.algo.Padding == PaddingMode.None)
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{
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throw new CryptographicException("invalid block length");
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}
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byte[] array = new byte[num + this.BlockSizeByte];
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Buffer.BlockCopy(inputBuffer, inputOffset, array, 0, inputCount);
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inputBuffer = array;
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inputOffset = 0;
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inputCount = array.Length;
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i = inputCount;
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}
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IL_A8:
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byte[] array2 = new byte[i];
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int num3 = 0;
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while (i > this.BlockSizeByte)
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{
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this.InternalTransformBlock(inputBuffer, inputOffset, this.BlockSizeByte, array2, num3);
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inputOffset += this.BlockSizeByte;
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num3 += this.BlockSizeByte;
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i -= this.BlockSizeByte;
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}
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byte b = (byte)(this.BlockSizeByte - num2);
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switch (this.algo.Padding)
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{
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case PaddingMode.PKCS7:
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{
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int num4 = array2.Length;
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while (--num4 >= array2.Length - (int)b)
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{
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array2[num4] = b;
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}
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Buffer.BlockCopy(inputBuffer, inputOffset, array2, num, num2);
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this.InternalTransformBlock(array2, num, this.BlockSizeByte, array2, num);
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return array2;
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}
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case PaddingMode.ANSIX923:
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array2[array2.Length - 1] = b;
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Buffer.BlockCopy(inputBuffer, inputOffset, array2, num, num2);
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this.InternalTransformBlock(array2, num, this.BlockSizeByte, array2, num);
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return array2;
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case PaddingMode.ISO10126:
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this.Random(array2, array2.Length - (int)b, (int)(b - 1));
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array2[array2.Length - 1] = b;
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Buffer.BlockCopy(inputBuffer, inputOffset, array2, num, num2);
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this.InternalTransformBlock(array2, num, this.BlockSizeByte, array2, num);
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return array2;
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}
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this.InternalTransformBlock(inputBuffer, inputOffset, this.BlockSizeByte, array2, num3);
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return array2;
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}
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// Token: 0x06000992 RID: 2450 RVA: 0x000275BC File Offset: 0x000257BC
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private byte[] FinalDecrypt(byte[] inputBuffer, int inputOffset, int inputCount)
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{
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if (inputCount % this.BlockSizeByte > 0)
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{
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throw new CryptographicException("Invalid input block size.");
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}
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int num = inputCount;
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if (this.lastBlock)
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{
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num += this.BlockSizeByte;
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}
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byte[] array = new byte[num];
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int num2 = 0;
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while (inputCount > 0)
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{
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int num3 = this.InternalTransformBlock(inputBuffer, inputOffset, this.BlockSizeByte, array, num2);
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inputOffset += this.BlockSizeByte;
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num2 += num3;
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inputCount -= this.BlockSizeByte;
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}
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if (this.lastBlock)
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{
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this.Transform(this.workBuff, this.workout);
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Buffer.BlockCopy(this.workout, 0, array, num2, this.BlockSizeByte);
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num2 += this.BlockSizeByte;
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this.lastBlock = false;
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}
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byte b = ((num <= 0) ? 0 : array[num - 1]);
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switch (this.algo.Padding)
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{
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case PaddingMode.PKCS7:
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{
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if (b == 0 || (int)b > this.BlockSizeByte)
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{
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this.ThrowBadPaddingException(this.algo.Padding, (int)b, -1);
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}
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for (int i = (int)(b - 1); i > 0; i--)
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{
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if (array[num - 1 - i] != b)
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{
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this.ThrowBadPaddingException(this.algo.Padding, -1, i);
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}
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}
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num -= (int)b;
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break;
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}
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case PaddingMode.ANSIX923:
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{
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if (b == 0 || (int)b > this.BlockSizeByte)
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{
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this.ThrowBadPaddingException(this.algo.Padding, (int)b, -1);
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}
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for (int j = (int)(b - 1); j > 0; j--)
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{
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if (array[num - 1 - j] != 0)
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{
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this.ThrowBadPaddingException(this.algo.Padding, -1, j);
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}
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}
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num -= (int)b;
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break;
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}
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case PaddingMode.ISO10126:
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if (b == 0 || (int)b > this.BlockSizeByte)
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{
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this.ThrowBadPaddingException(this.algo.Padding, (int)b, -1);
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}
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num -= (int)b;
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break;
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}
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if (num > 0)
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{
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byte[] array2 = new byte[num];
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Buffer.BlockCopy(array, 0, array2, 0, num);
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Array.Clear(array, 0, array.Length);
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return array2;
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}
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return new byte[0];
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}
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// Token: 0x06000993 RID: 2451 RVA: 0x000277F8 File Offset: 0x000259F8
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public virtual byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
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{
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if (this.m_disposed)
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{
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throw new ObjectDisposedException("Object is disposed");
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}
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this.CheckInput(inputBuffer, inputOffset, inputCount);
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if (this.encrypt)
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{
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return this.FinalEncrypt(inputBuffer, inputOffset, inputCount);
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}
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return this.FinalDecrypt(inputBuffer, inputOffset, inputCount);
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}
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// Token: 0x0400021E RID: 542
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protected SymmetricAlgorithm algo;
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// Token: 0x0400021F RID: 543
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protected bool encrypt;
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// Token: 0x04000220 RID: 544
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private int BlockSizeByte;
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// Token: 0x04000221 RID: 545
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private byte[] temp;
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// Token: 0x04000222 RID: 546
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private byte[] temp2;
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// Token: 0x04000223 RID: 547
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private byte[] workBuff;
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// Token: 0x04000224 RID: 548
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private byte[] workout;
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// Token: 0x04000225 RID: 549
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private int FeedBackByte;
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// Token: 0x04000226 RID: 550
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private int FeedBackIter;
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// Token: 0x04000227 RID: 551
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private bool m_disposed;
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// Token: 0x04000228 RID: 552
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private bool lastBlock;
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// Token: 0x04000229 RID: 553
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private RandomNumberGenerator _rng;
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}
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}
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