niko
100 lines
2.6 KiB
C#
100 lines
2.6 KiB
C#
using System;
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using Mono.Security.Cryptography;
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namespace System.Security.Cryptography
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{
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// Token: 0x0200053C RID: 1340
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internal class TripleDESTransform : SymmetricTransform
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{
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// Token: 0x06003114 RID: 12564 RVA: 0x000A89E4 File Offset: 0x000A6BE4
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public TripleDESTransform(TripleDES algo, bool encryption, byte[] key, byte[] iv)
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: base(algo, encryption, iv)
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{
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if (key == null)
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{
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key = TripleDESTransform.GetStrongKey();
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}
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if (TripleDES.IsWeakKey(key))
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{
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string text = Locale.GetText("This is a known weak key.");
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throw new CryptographicException(text);
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}
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byte[] array = new byte[8];
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byte[] array2 = new byte[8];
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byte[] array3 = new byte[8];
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DES des = DES.Create();
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Buffer.BlockCopy(key, 0, array, 0, 8);
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Buffer.BlockCopy(key, 8, array2, 0, 8);
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if (key.Length == 16)
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{
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Buffer.BlockCopy(key, 0, array3, 0, 8);
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}
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else
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{
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Buffer.BlockCopy(key, 16, array3, 0, 8);
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}
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if (encryption || algo.Mode == CipherMode.CFB)
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{
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this.E1 = new DESTransform(des, true, array, iv);
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this.D2 = new DESTransform(des, false, array2, iv);
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this.E3 = new DESTransform(des, true, array3, iv);
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}
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else
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{
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this.D1 = new DESTransform(des, false, array3, iv);
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this.E2 = new DESTransform(des, true, array2, iv);
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this.D3 = new DESTransform(des, false, array, iv);
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}
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}
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// Token: 0x06003115 RID: 12565 RVA: 0x000A8AF8 File Offset: 0x000A6CF8
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protected override void ECB(byte[] input, byte[] output)
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{
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DESTransform.Permutation(input, output, DESTransform.ipTab, false);
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if (this.encrypt)
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{
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this.E1.ProcessBlock(output, output);
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this.D2.ProcessBlock(output, output);
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this.E3.ProcessBlock(output, output);
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}
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else
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{
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this.D1.ProcessBlock(output, output);
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this.E2.ProcessBlock(output, output);
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this.D3.ProcessBlock(output, output);
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}
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DESTransform.Permutation(output, output, DESTransform.fpTab, true);
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}
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// Token: 0x06003116 RID: 12566 RVA: 0x000A8B80 File Offset: 0x000A6D80
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internal static byte[] GetStrongKey()
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{
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int num = DESTransform.BLOCK_BYTE_SIZE * 3;
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byte[] array = KeyBuilder.Key(num);
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while (TripleDES.IsWeakKey(array))
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{
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array = KeyBuilder.Key(num);
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}
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return array;
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}
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// Token: 0x04001406 RID: 5126
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private DESTransform E1;
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// Token: 0x04001407 RID: 5127
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private DESTransform D2;
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// Token: 0x04001408 RID: 5128
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private DESTransform E3;
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// Token: 0x04001409 RID: 5129
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private DESTransform D1;
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// Token: 0x0400140A RID: 5130
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private DESTransform E2;
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// Token: 0x0400140B RID: 5131
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private DESTransform D3;
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}
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}
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