Utilizing ARC4 Encryption with Javascript on iOS devices

I keep getting a blank result when running this code. It doesn't display anything.

[self.webview loadHTMLString:@"<script src=\"http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/rc4.js\"></script>"
                baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] resourcePath]]];

NSString *function = [[NSString alloc] initWithFormat: @"CryptoJS.RC4.encrypt(%@, %@)",@"abhijit",@"TestKey"];
NSString *result = [self.webview stringByEvaluatingJavaScriptFromString:function];

NSLog(@"----%@",result);

Could there be an error in the implementation of this code or is there something else causing the issue? Any suggestions would be appreciated.

Attempting to incorporate functionality from into an iOS application

Answer №1

When using UIWebView, it's important to remember that the content loads asynchronously. This means that after calling loadHTMLString:baseURL:, the page may not immediately appear. To ensure that everything loads properly, you'll need to evaluate any JavaScript code in webViewDidFinishLoad: within the web view's delegate.

For a more efficient approach, consider using JavaScriptCore directly. By creating a JSContext and evaluating the contents of rc4.js within it, you can access everything instantly. Keep in mind that this method is suitable for iOS 7 and later versions.

If you're dealing with crypto operations, it's highly recommended to utilize the CommonCrypto framework. This framework offers support for RC4, as evidenced by this snippet.

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