title: Google/Tink: How use public key to verify signature
body: <p>We want to use the <a href="https://github.com/google/tink" rel="noreferrer">Tink</a> library in our project to be able to verify some incoming signatures given a public key.</p>
  
  <p>What we have are the following:</p>
  
  <ol>
  <li>The public key as a string</li>
  <li>The signature itself</li>
  <li>The plaintext</li>
  </ol>
  
  <p>After going through Tink's documentation, we cannot figure out how to load the public key string so that it can be used by <code>PublicKeyVerifyFactory</code>.</p>
  
  <p>Has anybody done anything similar? Have you found any examples online that could point us to the right direction?</p>