niko
110 lines
3.0 KiB
C#
110 lines
3.0 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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namespace ICSharpCode.SharpZipLib.Encryption
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{
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// Token: 0x02000025 RID: 37
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internal class ZipAESStream : CryptoStream
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{
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// Token: 0x06000102 RID: 258 RVA: 0x00007F50 File Offset: 0x00006F50
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public ZipAESStream(Stream stream, ZipAESTransform transform, CryptoStreamMode mode)
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: base(stream, transform, mode)
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{
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this._stream = stream;
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this._transform = transform;
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this._slideBuffer = new byte[1024];
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this._blockAndAuth = 26;
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if (mode != CryptoStreamMode.Read)
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{
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throw new Exception("ZipAESStream only for read");
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}
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}
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// Token: 0x06000103 RID: 259 RVA: 0x00007F90 File Offset: 0x00006F90
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public override int Read(byte[] outBuffer, int offset, int count)
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{
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int i = 0;
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while (i < count)
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{
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int num = this._slideBufFreePos - this._slideBufStartPos;
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int num2 = this._blockAndAuth - num;
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if (this._slideBuffer.Length - this._slideBufFreePos < num2)
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{
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int num3 = 0;
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int j = this._slideBufStartPos;
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while (j < this._slideBufFreePos)
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{
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this._slideBuffer[num3] = this._slideBuffer[j];
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j++;
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num3++;
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}
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this._slideBufFreePos -= this._slideBufStartPos;
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this._slideBufStartPos = 0;
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}
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int num4 = this._stream.Read(this._slideBuffer, this._slideBufFreePos, num2);
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this._slideBufFreePos += num4;
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num = this._slideBufFreePos - this._slideBufStartPos;
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if (num < this._blockAndAuth)
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{
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if (num > 10)
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{
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int num5 = num - 10;
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this._transform.TransformBlock(this._slideBuffer, this._slideBufStartPos, num5, outBuffer, offset);
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i += num5;
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this._slideBufStartPos += num5;
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}
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else if (num < 10)
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{
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throw new Exception("Internal error missed auth code");
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}
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byte[] authCode = this._transform.GetAuthCode();
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for (int k = 0; k < 10; k++)
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{
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if (authCode[k] != this._slideBuffer[this._slideBufStartPos + k])
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{
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throw new Exception("AES Authentication Code does not match. This is a super-CRC check on the data in the file after compression and encryption. \r\nThe file may be damaged.");
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}
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}
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break;
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}
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this._transform.TransformBlock(this._slideBuffer, this._slideBufStartPos, 16, outBuffer, offset);
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i += 16;
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offset += 16;
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this._slideBufStartPos += 16;
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}
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return i;
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}
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// Token: 0x06000104 RID: 260 RVA: 0x0000812A File Offset: 0x0000712A
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public override void Write(byte[] buffer, int offset, int count)
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{
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throw new NotImplementedException();
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}
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// Token: 0x0400008B RID: 139
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private const int AUTH_CODE_LENGTH = 10;
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// Token: 0x0400008C RID: 140
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private const int CRYPTO_BLOCK_SIZE = 16;
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// Token: 0x0400008D RID: 141
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private Stream _stream;
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// Token: 0x0400008E RID: 142
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private ZipAESTransform _transform;
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// Token: 0x0400008F RID: 143
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private byte[] _slideBuffer;
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// Token: 0x04000090 RID: 144
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private int _slideBufStartPos;
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// Token: 0x04000091 RID: 145
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private int _slideBufFreePos;
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// Token: 0x04000092 RID: 146
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private int _blockAndAuth;
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}
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}
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