75 lines
2.2 KiB
C#
75 lines
2.2 KiB
C#
// Copyright (c) .NET Foundation and contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.Security.Cryptography;
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using Microsoft.Build.Framework;
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using Microsoft.Build.Utilities;
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namespace Microsoft.DotNet.Cli.Build
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{
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public class GenerateGuidFromName : Task
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{
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[Required]
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public string Name { get; set; }
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[Output]
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public string OutputGuid { get; set; }
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public override bool Execute()
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{
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OutputGuid = GenerateGuid(Name).ToString().ToUpper();
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return true;
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}
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public static Guid GenerateGuid(string name)
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{
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// Any fixed GUID will do for a namespace.
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Guid namespaceId = new Guid("28F1468D-672B-489A-8E0C-7C5B3030630C");
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using (SHA1 hasher = SHA1.Create())
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{
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var nameBytes = System.Text.Encoding.UTF8.GetBytes(name ?? string.Empty);
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var namespaceBytes = namespaceId.ToByteArray();
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SwapGuidByteOrder(namespaceBytes);
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var streamToHash = new byte[namespaceBytes.Length + nameBytes.Length];
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Array.Copy(namespaceBytes, streamToHash, namespaceBytes.Length);
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Array.Copy(nameBytes, 0, streamToHash, namespaceBytes.Length, nameBytes.Length);
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var hashResult = hasher.ComputeHash(streamToHash);
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var res = new byte[16];
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Array.Copy(hashResult, res, res.Length);
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unchecked { res[6] = (byte)(0x50 | (res[6] & 0x0F)); }
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unchecked { res[8] = (byte)(0x40 | (res[8] & 0x3F)); }
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SwapGuidByteOrder(res);
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return new Guid(res);
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}
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}
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// Do a byte order swap, .NET GUIDs store multi byte components in little
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// endian.
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private static void SwapGuidByteOrder(byte[] b)
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{
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Swap(b, 0, 3);
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Swap(b, 1, 2);
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Swap(b, 5, 6);
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Swap(b, 7, 8);
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}
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private static void Swap(byte[] b, int x, int y)
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{
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byte t = b[x];
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b[x] = b[y];
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b[y] = t;
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}
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}
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}
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