ssh_client_key_api -

client_key_cb_options(T) =
           [{key_cb_private, [T]} | ssh:client_option()]

              Options provided to ssh:connect/[3,4].

              The option list given in the key_cb option is available with the key key_cb_private.

       Behavior  describing  the  API  for  public  key handling of an SSH client. By implementing the callbacks
       defined in this behavior, the public key handling of an SSH client can be customized. By default the  ssh
       application implements this behavior with help of the standard OpenSSH files, see the  ssh(7) application
       manual.

Module:add_host_key(HostNames,PublicHostKey,ConnectOptions)->ok|{error,Reason}

              Types:

                 HostNames = string()
                   Description of the host that owns the PublicHostKey.
                 PublicHostKey = public_key:public_key()
                   Of  ECDSA  keys,  only  the  Normally  an RSA, DSA or ECDSA public key, but handling of other
                   public keys can be added.
                 ConnectOptions = client_key_cb_options()

              This function is retired in favour for Module:add_host_key/4 which is the prefered  API  function.
              The  calling  SSH  application  will  still  try  the add_host_key/3 if the call to add_host_key/4
              failed.

              Adds a host key to the set of trusted host keys.

       Module:add_host_key(Host,Port,PublicHostKey,ConnectOptions)->ok|{error,Reason}

              Types:

                 Host = inet:ip_address() | inet:hostname() | [ inet:ip_address() | inet:hostname() ]
                   The host that owns the PublicHostKey. One or more IP addresses or hostnames.
                 Port = inet:port_number()
                   The Port number of the Host.
                 PublicHostKey = public_key:public_key()
                   Of ECDSA keys, only the Normally an RSA, DSA or ECDSA  public  key,  but  handling  of  other
                   public keys can be added.
                 ConnectOptions = client_key_cb_options()

              Adds a host key to the set of trusted host keys.

              This  function  is prefered to the old Module:add_host_key/3 since it also uses the peer host port
              number and may return an error message.

              The OTP/SSH application first calls this function  in  the  callback  module,  and  then  the  old
              Module:add_host_key/3 for compatibilty.

       Module:is_host_key(Key,Host,Algorithm,ConnectOptions)->Result

              Types:

                 Key = public_key:public_key()
                   Normally an RSA, DSA or ECDSA public key, but handling of other public keys can be added.
                 Host = string()
                   Description of the host.
                 Algorithm = ssh:pubkey_alg()
                   Host key algorithm.
                 ConnectOptions = client_key_cb_options()
                 Result = boolean()

              This  function  is  retired in favour for Module:is_host_key/5 which is the prefered API function.
              The calling SSH application will still try the is_host_key/4 if the call to is_host_key/5 failed.

              Checks if a host key is trusted.

       Module:is_host_key(Key,Host,Port,Algorithm,ConnectOptions)->Result

              Types:

                 Key = public_key:public_key()
                   Normally an RSA, DSA or ECDSA public key, but handling of other public keys can be added.
                 Host = inet:ip_address() | inet:hostname() | [ inet:ip_address() | inet:hostname() ]
                   Description of the host with one or more IP addresses or hostnames.
                 Port = inet:port_number()
                   The Port number of the host.
                 Algorithm = ssh:pubkey_alg()
                   Host key algorithm.
                 ConnectOptions = client_key_cb_options()
                 Result = boolean() | {error, Error::term()}
                   The exact error message depends on the actual callback module. The Error  message  makes  the
                   connection to fail, and is returned from e.g ssh:connect/3.

              Checks if a host key is trusted.

              This  function  is  prefered to the old Module:is_host_key/4 since it also uses the peer host port
              number and may return an error message.

              The OTP/SSH application first calls this function  in  the  callback  module,  and  then  the  old
              Module:is_host_key/4 for compatibilty.

       Module:user_key(Algorithm,ConnectOptions)->Result

              Types:

                 Algorithm = ssh:pubkey_alg()
                   Host key algorithm.
                 ConnectOptions = client_key_cb_options()
                 Result = {ok, public_key:private_key()} | {ok, {ssh2_pubkey, PubKeyBlob :: binary()}} | {error,
                 term()}

              Fetches  the  users  publickey  matching  the  Algorithm.  Some  key callback modules may return
              {ssh2_pubkey,PubKeyBlob::binary()}.

          Note:
              The private key contains the public key.

Ericsson AB                                         ssh 4.13                            ssh_client_key_api(3erl)

       ssh_client_key_api -
            -behaviour(ssh_client_key_api).