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35 lines
1.5 KiB
35 lines
1.5 KiB
namespace com.hitrust.util.Encryption
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{
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using com.hitrust.util.Checksums;
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using System;
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using System.Security.Cryptography;
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public abstract class PkzipClassic : SymmetricAlgorithm
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{
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protected PkzipClassic()
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{
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}
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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[] newKeys = new uint[] { 0x12345678, 0x23456789, 0x34567890 };
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for (int i = 0; i < seed.Length; i++)
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{
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newKeys[0] = Crc32.ComputeCrc32(newKeys[0], seed[i]);
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newKeys[1] += (byte) newKeys[0];
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newKeys[1] = (newKeys[1] * 0x8088405) + 1;
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newKeys[2] = Crc32.ComputeCrc32(newKeys[2], (byte) (newKeys[1] >> 0x18));
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}
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return new byte[] { ((byte) (newKeys[0] & 0xff)), ((byte) ((newKeys[0] >> 8) & 0xff)), ((byte) ((newKeys[0] >> 0x10) & 0xff)), ((byte) ((newKeys[0] >> 0x18) & 0xff)), ((byte) (newKeys[1] & 0xff)), ((byte) ((newKeys[1] >> 8) & 0xff)), ((byte) ((newKeys[1] >> 0x10) & 0xff)), ((byte) ((newKeys[1] >> 0x18) & 0xff)), ((byte) (newKeys[2] & 0xff)), ((byte) ((newKeys[2] >> 8) & 0xff)), ((byte) ((newKeys[2] >> 0x10) & 0xff)), ((byte) ((newKeys[2] >> 0x18) & 0xff)) };
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}
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}
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}
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