niko
47 lines
1.3 KiB
C#
47 lines
1.3 KiB
C#
using System;
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using System.Security.Cryptography;
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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: 0x02000020 RID: 32
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public abstract class PkzipClassic : SymmetricAlgorithm
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{
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// Token: 0x060000E0 RID: 224 RVA: 0x00007A8C File Offset: 0x00006A8C
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public static byte[] GenerateKeys(byte[] seed)
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{
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if (seed == null)
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{
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throw new ArgumentNullException("seed");
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}
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if (seed.Length == 0)
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{
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throw new ArgumentException("Length is zero", "seed");
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}
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uint[] array = new uint[] { 305419896U, 591751049U, 878082192U };
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for (int i = 0; i < seed.Length; i++)
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{
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array[0] = Crc32.ComputeCrc32(array[0], seed[i]);
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array[1] = array[1] + (uint)((byte)array[0]);
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array[1] = array[1] * 134775813U + 1U;
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array[2] = Crc32.ComputeCrc32(array[2], (byte)(array[1] >> 24));
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}
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return new byte[]
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{
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(byte)(array[0] & 255U),
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(byte)((array[0] >> 8) & 255U),
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(byte)((array[0] >> 16) & 255U),
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(byte)((array[0] >> 24) & 255U),
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(byte)(array[1] & 255U),
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(byte)((array[1] >> 8) & 255U),
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(byte)((array[1] >> 16) & 255U),
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(byte)((array[1] >> 24) & 255U),
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(byte)(array[2] & 255U),
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(byte)((array[2] >> 8) & 255U),
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(byte)((array[2] >> 16) & 255U),
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(byte)((array[2] >> 24) & 255U)
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};
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}
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}
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}
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