title: openssl command line to verify the signature
body: <p>Hi I have generated a key pair and used the private key to generate a signature.</p>
  
  <pre><code>openssl rsautl -sign -in helloworld.txt -inkey aa.pem -out sig
  </code></pre>
  
  <p>However I am unable to verify the signature with my public key:</p>
  
  <pre><code>openssl rsautl -verify -in helloworld.txt -inkey aa.pub -sigfile sig
  </code></pre>
  
  <p>I know there -sigfile is deprecated. and some of the online doc from openssl.org is wrong. </p>
  
  <p>Whats the command I should use to verify the sig with my public key?</p>