Getting access token in Provider hosted app.

Below code is used to get the access token that is required for SharePoint authorization. I have created below understanding with this code, please correct me if i am wrong somewhere.

1. This code will only work with SharePoint online not with On-Premises Installation.
2. Host web provides the content token in URL.
3. TokenHelper.GetContextTokenFromRequest method extract that token from URL.
4. TokenHelper.ReadAndValidateContextToken validates the context token with ACS.
5. With the help of context token, TokenHelper.GetAccessToken retrieves Access token from ACS.
6. Access token will be passed to TokenHelper.GetClientContextWithAccessToken() to create clientcontext.
   

TokenHelper.TrustAllCertificates();
string contextTokenString = TokenHelper.GetContextTokenFromRequest(Request);
if (contextTokenString != null)
{
contextToken = TokenHelper.ReadAndValidateContextToken(contextTokenString, Request.Url.Authority);
sharepointUrl = new Uri(Request.QueryString["SPHostUrl"]);
accessToken = TokenHelper.GetAccessToken(contextToken, sharepointUrl.Authority).AccessToken;
}

If i need to do same thing on-premises SharePoint installation what should i do?

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