如何在.Net 3.5框架中实现安全协议TLS 1.2

Question

由于PayPal更新了他们的响应，我需要在.NET 3.5框架中的现有应用程序中将安全协议TLS更新为v1.2。 需要更改现有代码中的更改，我无法将应用程序更新到较新的框架。

Answer 1

如果您在NET 3.5.1上，您可以选择应用汇总修补程序并应用注册表编辑来告诉.NET使用系统默认值。 More details here

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

Answer 2

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

添加进口：

Imports System.Security.Authentication 
Imports System.Net 

这添加到我的代码（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()