// from http://www.dustindiaz.com/top-ten-javascript
function doLogin(form) {
	// first encrypt pass using salt
	form['pass'].value = hex_hmac_sha1(form['salt'].value, form['pass_field'].value);
	// clear field
	fake = '';
	for (i = 0; i < form['pass_field'].value.length; i++) {
		fake = fake + '-';
	}
	form['pass_field'].value = fake;

	// then encrypt pass again using session key
	form['pass'].value = hex_hmac_sha1(form['key'].value, form['pass'].value);
	return true;
}

function doRegister(form) {
	// encrypt pass using salt
	if(form['pass_field_1'].value.length > 0) {
		form['pass1'].value = hex_hmac_sha1(form['salt'].value, form['pass_field_1'].value);
	}
	
	if(form['pass_field_2'].value.length > 0) {
		form['pass2'].value = hex_hmac_sha1(form['salt'].value, form['pass_field_2'].value);
	}
	
	// pass_field_curr does not allways exist
	// must be encrypted with key AND salt
	if(form['pass_field_curr'] && form['pass_field_curr'].value.length > 0) {
		form['passcurr'].value = hex_hmac_sha1(form['key'].value, hex_hmac_sha1(form['salt'].value, form['pass_field_curr'].value));
	}
	
	// clear field
	
	fake = '';
	for (i = 0; i < form['pass_field_1'].value.length; i++) {
		fake = fake + '-';
	}
	form['pass_field_1'].value = fake;
	
	fake = '';
	for (i = 0; i < form['pass_field_2'].value.length; i++) {
		fake = fake + '-';
	}
	form['pass_field_2'].value = fake;

	fake = '';
	// pass_field_curr does not allways exist
	if (form['pass_field_curr']) {
		for (i = 0; i < form['pass_field_curr'].value.length; i++) {
			fake = fake + '-';
		}
	}
	form['pass_field_curr'].value = fake;
	
	return true;
}