Google Chrome extension for automagic form filling.

Install extension. Setup shared key in extension options.
Then, create URL: http://example.com/form#$request.$signature
where $request is base64 encoded JSON:

{
	"form name or form number" => {
		"field 1 name" => "field 1 value",
		"field 2 name" => "field 2 value"
	}, "other form name or number" => {
		...
	}
}

and $signature is hexdigest HMAC-SHA1 of http://example.com/form#$request, sample generating code in ruby:

require 'digest'

def signature(messsage, secret)
	Digest::HMAC.hexdigest(message, secret, Digest::SHA1)
end

Remote form code:

<form name="foo">
	<input type="text" name="bar" />
	<textarea name="baz"></textarea>
	...
</form>

Request:

{
	"foo" => {
		"bar" => "value for bar text field",
		"baz" => "value for baz textarea"
	}
}

Checkboxes and everything else, that does not simply use formelement.value in DOM is not supported.

Form can be filled only when signature matches. Signature check debugging (console logs) can be enabled in extension options.

jQuery-2.0.1
crypto-js - https://code.google.com/p/crypto-js/