Util/DataProtectorHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace Util
{
    /// <summary>
    /// 数据加密解密
    /// </summary>
    public class DataProtectorHelper
    {

        [DllImport("Crypt32.dll", SetLastError=true,CharSet=System.Runtime.InteropServices.CharSet.Auto)] 
        private static extern bool CryptProtectData(ref DATA_BLOB pDataIn, 
            String szDataDescr, 
            ref DATA_BLOB pOptionalEntropy,
            IntPtr pvReserved, 
            ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct, 
            int dwFlags, 
            ref DATA_BLOB pDataOut);

        [DllImport("Crypt32.dll", SetLastError=true, 
             CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        private static extern bool CryptUnprotectData(ref DATA_BLOB pDataIn, 
            String szDataDescr, 
            ref DATA_BLOB pOptionalEntropy, 
            IntPtr pvReserved, 
            ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct, 
            int dwFlags, 
            ref DATA_BLOB pDataOut);
        [DllImport("kernel32.dll", 
             CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        private unsafe static extern int FormatMessage(int dwFlags, 
            ref IntPtr lpSource, 
            int dwMessageId,
            int dwLanguageId, 
            ref String lpBuffer, int nSize, 
            IntPtr *Arguments);

        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
            internal struct DATA_BLOB
        {
            public int cbData;
            public IntPtr pbData;
        }

        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
            internal struct CRYPTPROTECT_PROMPTSTRUCT
        {
            public int cbSize;
            public int dwPromptFlags;
            public IntPtr hwndApp;
            public String szPrompt;
        }
        static private IntPtr NullPtr = ((IntPtr)((int)(0)));
        private const int CRYPTPROTECT_UI_FORBIDDEN = 0x1;
        private const int CRYPTPROTECT_LOCAL_MACHINE = 0x4;