niko
54 lines
1.6 KiB
C#
54 lines
1.6 KiB
C#
using System;
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using ICSharpCode.SharpZipLib.Checksums;
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namespace ICSharpCode.SharpZipLib.Encryption
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{
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// Token: 0x02000021 RID: 33
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internal class PkzipClassicCryptoBase
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{
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// Token: 0x060000E2 RID: 226 RVA: 0x00007BE0 File Offset: 0x00006BE0
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protected byte TransformByte()
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{
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uint num = (this.keys[2] & 65535U) | 2U;
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return (byte)(num * (num ^ 1U) >> 8);
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}
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// Token: 0x060000E3 RID: 227 RVA: 0x00007C08 File Offset: 0x00006C08
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protected void SetKeys(byte[] keyData)
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{
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if (keyData == null)
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{
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throw new ArgumentNullException("keyData");
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}
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if (keyData.Length != 12)
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{
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throw new InvalidOperationException("Key length is not valid");
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}
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this.keys = new uint[3];
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this.keys[0] = (uint)(((int)keyData[3] << 24) | ((int)keyData[2] << 16) | ((int)keyData[1] << 8) | (int)keyData[0]);
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this.keys[1] = (uint)(((int)keyData[7] << 24) | ((int)keyData[6] << 16) | ((int)keyData[5] << 8) | (int)keyData[4]);
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this.keys[2] = (uint)(((int)keyData[11] << 24) | ((int)keyData[10] << 16) | ((int)keyData[9] << 8) | (int)keyData[8]);
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}
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// Token: 0x060000E4 RID: 228 RVA: 0x00007CA4 File Offset: 0x00006CA4
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protected void UpdateKeys(byte ch)
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{
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this.keys[0] = Crc32.ComputeCrc32(this.keys[0], ch);
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this.keys[1] = this.keys[1] + (uint)((byte)this.keys[0]);
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this.keys[1] = this.keys[1] * 134775813U + 1U;
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this.keys[2] = Crc32.ComputeCrc32(this.keys[2], (byte)(this.keys[1] >> 24));
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}
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// Token: 0x060000E5 RID: 229 RVA: 0x00007D1A File Offset: 0x00006D1A
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protected void Reset()
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{
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this.keys[0] = 0U;
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this.keys[1] = 0U;
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this.keys[2] = 0U;
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}
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// Token: 0x04000089 RID: 137
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private uint[] keys;
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}
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}
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