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Diff for /src/usr.bin/ssh/PROTOCOL.certkeys between version 1.13 and 1.18

version 1.13, 2017/11/03 02:32:19 version 1.18, 2021/06/04 04:02:21
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 acceptance of certified host keys, by adding a similar ability to  acceptance of certified host keys, by adding a similar ability to
 specify CA keys in ~/.ssh/known_hosts.  specify CA keys in ~/.ssh/known_hosts.
   
   All certificate types include certification information along with the
   public key that is used to sign challenges. In OpenSSH, ssh-keygen
   performs the CA signing operation.
   
 Certified keys are represented using new key types:  Certified keys are represented using new key types:
   
     ssh-rsa-cert-v01@openssh.com      ssh-rsa-cert-v01@openssh.com
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     ecdsa-sha2-nistp256-cert-v01@openssh.com      ecdsa-sha2-nistp256-cert-v01@openssh.com
     ecdsa-sha2-nistp384-cert-v01@openssh.com      ecdsa-sha2-nistp384-cert-v01@openssh.com
     ecdsa-sha2-nistp521-cert-v01@openssh.com      ecdsa-sha2-nistp521-cert-v01@openssh.com
       ssh-ed25519-cert-v01@openssh.com
   
 These include certification information along with the public key  Two additional types exist for RSA certificates to force use of
 that is used to sign challenges. ssh-keygen performs the CA signing  SHA-2 signatures (SHA-256 and SHA-512 respectively):
 operation.  
   
       rsa-sha2-256-cert-v01@openssh.com
       rsa-sha2-512-cert-v01@openssh.com
   
   These RSA/SHA-2 types should not appear in keys at rest or transmitted
   on their wire, but do appear in a SSH_MSG_KEXINIT's host-key algorithms
   field or in the "public key algorithm name" field of a "publickey"
   SSH_USERAUTH_REQUEST to indicate that the signature will use the
   specified algorithm.
   
 Protocol extensions  Protocol extensions
 -------------------  -------------------
   
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     valid after <= current time < valid before      valid after <= current time < valid before
   
 criticial options is a set of zero or more key options encoded as  critical options is a set of zero or more key options encoded as
 below. All such options are "critical" in the sense that an implementation  below. All such options are "critical" in the sense that an implementation
 must refuse to authorise a key that has an unrecognised option.  must refuse to authorise a key that has an unrecognised option.
   
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                                       certificates may be presented from any                                        certificates may be presented from any
                                       source address.                                        source address.
   
   verify-required         empty         Flag indicating that signatures made
                                         with this certificate must assert FIDO
                                         user verification (e.g. PIN or
                                         biometric). This option only make sense
                                         for the U2F/FIDO security key types that
                                         support this feature in their signature
                                         formats.
   
 Extensions  Extensions
 ----------  ----------
   
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 Name                    Format        Description  Name                    Format        Description
 -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
   no-touch-required       empty         Flag indicating that signatures made
                                         with this certificate need not assert
                                         FIDO user presence. This option only
                                         make sense for the U2F/FIDO security
                                         key types that support this feature in
                                         their signature formats.
   
 permit-X11-forwarding   empty         Flag indicating that X11 forwarding  permit-X11-forwarding   empty         Flag indicating that X11 forwarding
                                       should be permitted. X11 forwarding will                                        should be permitted. X11 forwarding will
                                       be refused if this option is absent.                                        be refused if this option is absent.
Legend:
Removed from v.1.13  
changed lines
  Added in v.1.18