To request text be signed, submit the form below.

crypto.signText() returns a Promise which, when resolved, contains the signed text.

Enter text to sign: I read the terms and conditions.

Resulting signed text:

Sign

To detect presence of the API, call crypto.signText() without any parameters. If you receive a Promise in return, the new API is present..

Response from API detection:

Detect

The original crypto.signText() as implemented by Netscape and then Firefox returned a string instead of a Promise. The following code shows the legacy behaviour, and should not be used in modern code.

Enter text to sign: I read the terms and conditions.

Resulting signed text:

Legacy Sign

The following form detects the return value from crypto.signText(). If we detect a string, we populate the field immediately, otherwise we resolve the promise returned. This form should work on both new and legacy browsers.

Enter text to sign: I read the terms and conditions.

Resulting signed text:

Combined Sign

The javascript used to trigger the crypto.signText() functionality can be downloaded here, and is included for reference below.

 { form['signed'].value = response });
  }
  else {
    alert('An implementation of crypto.signText() is not installed in this browser.');
  }
}

function detectRequest(form) {
  if (crypto.signText) {
    crypto.signText().then(response => form['detected'].value = response.name + ' v' + response.version);
  }
  else {
    alert('An implementation of crypto.signText() is not installed in this browser.');
  }
}

function signLegacyRequest(form) {
  if (crypto.signText) {
    form['legacysigned'].value = crypto.signText(form['tobelegacysigned'].value, 'ask');
    return true;
  }
  else {
    alert('An implementation of crypto.signText() is not installed in this browser.');
  }
}

function signCombinedRequest(form) {
  if (crypto.signText) {
    value = crypto.signText(form['tobecombinedsigned'].value, 'ask');
    if (typeof value === 'string') {
      form['combinedsigned'].value = value;
    }
    else {
      value.then(response => { form['combinedsigned'].value = response }).catch(error => {alert(error)});
    }
    return true;
  }
  else {
    alert('An implementation of crypto.signText() is not installed in this browser.');
  }
}]]>