38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
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namespace DSInternals.Common
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{
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using System;
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using System.Security.Principal;
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public static class SecurityIdentifierExtensions
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{
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private const int ridLength = 4;
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public static int GetRid(this SecurityIdentifier sid)
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{
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Validator.AssertNotNull(sid, "sid");
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byte[] binaryForm = sid.GetBinaryForm();
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int domainSidLength = binaryForm.Length - ridLength;
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if (domainSidLength < 0)
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{
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throw new ArgumentOutOfRangeException("sid", binaryForm.Length, "The SID is too short.");
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}
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return BitConverter.ToInt32(binaryForm, domainSidLength);
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}
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public static byte[] GetBinaryForm(this SecurityIdentifier sid, bool bigEndianRid = false)
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{
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Validator.AssertNotNull(sid, "sid");
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int sidLength = sid.BinaryLength;
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byte[] binarySid = new byte[sidLength];
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sid.GetBinaryForm(binarySid, 0);
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if (bigEndianRid)
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{
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int lastByteIndex = sidLength - 1;
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// Convert RID from big endian to little endian (Reverse the order of the last 4 bytes)
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binarySid.SwapBytes(lastByteIndex - 3, lastByteIndex);
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binarySid.SwapBytes(lastByteIndex - 2, lastByteIndex - 1);
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}
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return binarySid;
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}
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}
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}
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