What's the supported sip encryption protocols by Asterisk?

Based on the following sencryption protocols, what’s the supported one by Asterisk?

  • RC4
  • RC2
  • DES
  • 3DES

Are there other encryption protocols suppoorted by asterisk?

Are there an asterisk command to know the supported encryption protocols?

Does Asterisk use OpenSSL for encryption? If yes Does the Asterisk use all the encryption algorithmes defined in the OpenSSL?. If yes then we can determine the sip encryption keys