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框架上的现有应用程序中将安全协议TLS更新到v1.2。 在现有代码中更新此更改所需的更改，我无法将应用程序更新到更新的框架。

Answer 1

我正在使用VS 2008与.net 3.5.30729.4926。我所要做的就是：

添加导入：

Imports System.Security.Authentication
Imports System.Net

将此添加到我的代码（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()  

Answer 2

只需在vb .net 3.5版本中添加您的代码：

ServicePointManager.SecurityProtocol = DirectCast(3072, SecurityProtocolType)

然后您的代码变为：

ServicePointManager.SecurityProtocol = DirectCast(3072, SecurityProtocolType)

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"
.............

希望这个帮助

Answer 3

如果您使用的是.NET 3.5.1，则可以选择应用汇总修补程序并应用注册表编辑以告知.NET使用系统默认值。 More details here

如果你没有使用.NET 4.5 for TLS 1.2＆amp; 1.1支持和至少在Windows Server 2008 R2上。