C# Signature:

[DllImport("credui.dll", SetLastError=true)]
static extern TODO CredUnPackAuthenticationBuffer(TODO);

VB Signature:

    ''' <summary>
    ''' Windows Platform function (called via pInvoke) which authentication details from a packed authentication buffer.
    ''' See http://msdn.microsoft.com/en-us/library/aa375185(v=vs.85).aspx
    ''' </summary>
    ''' <param name="dwFlags">Setting the value of this parameter to CRED_PACK_PROTECTED_CREDENTIALS (1)
    ''' specifies that the function attempts to decrypt the password before returning it in the pszPassword buffer.
    ''' If the password cannot be decrypted, the function returns FALSE, an a call to the GetLastError function will return the value ERROR_NOT_CAPABLE.</param>
    ''' <param name="pAuthBuffer">The packed authentication buffer containing credentials to be unpacked.</param>
    ''' <param name="cbAuthBuffer">The length of the authentication buffer.</param>
    ''' <param name="pszUserName">User Name variable which will populated from the buffer.</param>
    ''' <param name="pcchMaxUserName">The maximum length of the User Name variable.</param>
    ''' <param name="pszDomainName">Domain variable which will populated from the buffer.</param>
    ''' <param name="pcchMaxDomainName">The maximum length of the Domain variable.</param>
    ''' <param name="pszPassword">Password variable which will populated from the buffer.</param>
    ''' <param name="pcchMaxPassword">The maximum length of the Password variable.</param>
    ''' <returns><c>True</c> on success; otherwise <c>False</c>. For extended error information, call the GetLastError() function.</returns>
    <DllImport("credui.dll", CharSet:=CharSet.Unicode, SetLastError:=True)> <CLSCompliant(False)> _
    Public Shared Function CredUnPackAuthenticationBuffer(ByVal dwFlags As UInt32, _
                              ByVal pAuthBuffer As IntPtr, ByVal cbAuthBuffer As UInt32, _
                              ByVal pszUserName As StringBuilder, ByRef pcchMaxUserName As UInt32, _
                              ByVal pszDomainName As StringBuilder, ByRef pcchMaxDomainName As UInt32, _
                              ByVal pszPassword As StringBuilder, ByRef pcchMaxPassword As UInt32) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function

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