如何在.Net 3.5框架中實現安全協議TLS 1.2

Question

由於PayPal更新了他們的響應，我需要在.NET 3.5框架中的現有應用程序中將安全協議TLS更新爲v1.2。 需要更改現有代碼中的更改，我無法將應用程序更新到較新的框架。

Answer 1

如果您在NET 3.5.1上，您可以選擇應用匯總修補程序並應用註冊表編輯來告訴.NET使用系統默認值。 More details here

如果您需要使用.NET 4.5 for TLS 1.2 & 1.1支持，並且至少需要在Windows Server 2008 R2上運行。

Answer 2

我使用VS 2008與.net 3.5.30729.4926。我所要做的就是：

添加進口：

Imports System.Security.Authentication 
Imports System.Net 

這添加到我的代碼（C＃）：

public const SslProtocols _Tls12 = (SslProtocols)0x00000C00; 
public const SecurityProtocolType Tls12 = (SecurityProtocolType)_Tls12; 
ServicePointManager.SecurityProtocol = Tls12 

VB.net版本：

Const _Tls12 As SslProtocols = DirectCast(&HC00, SslProtocols) 
Const Tls12 As SecurityProtocolType = DirectCast(_Tls12, SecurityProtocolType) 
ServicePointManager.SecurityProtocol = Tls12 

Dim wbrq As HttpWebRequest 
Dim wbrs As HttpWebResponse 
Dim sw As StreamWriter 
Dim sr As StreamReader 
Dim strResult As String 

'Create a new HttpWebRequest object. 
wbrq = WebRequest.Create(strURL) 
wbrq.Method = "POST" 
wbrq.ContentLength = DataString.Length 
wbrq.ContentType = "application/x-www-form-urlencoded" 

'upload data 
sw = New StreamWriter(wbrq.GetRequestStream) 
sw.Write(DataString) 
sw.Close() 

'get response 
wbrs = wbrq.GetResponse 
sr = New StreamReader(wbrs.GetResponseStream) 
strResult = sr.ReadToEnd.Trim 
sr.Close()