@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The CryptUnprotectData function decrypts and does an integrity check of the data in a DATA_BLOB structure. Usually, only a user with the same logon credentials as the encrypter can decrypt the data. In addition, the encryption and decryption must be done on the same computer. !!!!C# Signature: [ DllImport("Crypt32.dll", SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto) ] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool CryptUnprotectData( ref DATA_BLOB pDataIn, StringBuilder szDataDescr, ref DATA_BLOB pOptionalEntropy, IntPtr pvReserved, ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct, CryptProtectFlags dwFlags, ref DATA_BLOB pDataOut ); !!!!VB .NET Signature: <DllImport("Crypt32.dll", SetLastError:=True, CharSet:=System.Runtime.InteropServices.CharSet.Auto)> _ Private Shared Function CryptUnprotectData _ ( _ ByRef pDataIn As DATA_BLOB, _ ByVal szDataDescr As StringBuilder, _ ByRef pOptionalEntropy As DATA_BLOB, _ ByVal pvReserved As IntPtr, _ ByRef pPromptStruct As CRYPTPROTECT_PROMPTSTRUCT, _ ByVal dwFlags As Integer, _ ByRef pDataOut As DATA_BLOB _ ) As Boolean End Function !!!!See also: [DATA_BLOB] [CRYPTPROTECT_PROMPTSTRUCT] CryptProtectFlags CryptProtectData !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: How To Create a DPAPI Library: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secmod/html/secmod21.asp !!!!Alternative Managed API: In .NET v2.0, the ProtectedData.Unprotect@msdn method provides the same functionality. Documentation: CryptUnprotectData@msdn on MSDN
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