RecaptchaV2.NET

Implements a class that allows you to use Googles Recaptcha V2 library with .NET (Webforms or MVC)

Also implements Googles very badly documented Secure Token functionality mentioned here: https://developers.google.com/recaptcha/docs/secure_token

Secure Token requires the use of AES in EBC mode, with PKCS5/PKCS7 padding. The key and initialization vector are the first 16 bytes of your Google Recaptcha Secret Key SHA1 hash.

How to use

• Download the source code
• This is a Visual Studio 2015 / .NET 4.6 project, so make sure you are running Visual Studio 2015 or above
• Open RecaptchaExample.aspx.cs and edit the google_site_key and google_secret_key strings and put in your appropriate recaptcha 2.0 site key and secret key in all 4 locations
• Run the project

Notes

• This uses the secure token variation of recaptcha by default, not the site specific version. If you wish to use the site specific version then call recaptcha.GetSiteSpecificRecaptchaHTML() function instead.

Acknowledgements

• ReCaptchaV2.NET currently support Version 2 only. An existing .NET library is available for version 1.0 from Google.
• This project is based off of work from here: Aliencube.ReCaptcha.NET and ReCaptchav2dotnet

Releases

• 2015-08-04 - v1.0 First release

Contact

• Matt Olson - Keelio Software