libssh2_agent_sign - sign data, with the help of ssh-agent

       Added in libssh2 1.11.0

agent - ssh-agent handle as returned by libssh2_agent_init(3)identity - Public key to authenticate with, as returned by libssh2_agent_get_identity(3)sig  -  A  pointer to a buffer in which to place the signature. The caller is responsible for freeing the
       signature with LIBSSH2_FREE.

       s_len - A pointer to the length of the sig parameter.

       data - The data to sign.

       d_len - The length of the data parameter.

       method - A buffer indicating  the  signing  method.  This  should  match  the  string  at  the  start  of
       identity->blob.

       method_len - The length of the method parameter.

       Sign   data   using   an   ssh-agent.   This   function  can  be  used  in  a  callback  registered  with
       libssh2_session_callback_set2(3)  using  LIBSSH2_CALLBACK_AUTHAGENT_SIGN  to   sign   an   authentication
       challenge  from  a  server.  However, the client is responsible for implementing the code that calls this
       callback in response to a SSH2_AGENTC_SIGN_REQUEST message.

       libssh2_agent_sign - sign data, with the help of ssh-agent

       Returns 0 if succeeded, or a negative value for error.

libssh2_agent_init(3)libssh2_agent_get_identity(3)libssh2_agent_userauth(3)libssh2_session_callback_set2(3)

libssh2                                            1 Oct 2022                              libssh2_agent_sign(3)

       #include <libssh2.h>

       int
       libssh2_agent_sign(LIBSSH2_AGENT *agent,
                          struct libssh2_agent_publickey *identity,
                          unsigned char **sig,
                          size_t *s_len,
                          const unsigned char *data,
                          size_t d_len,
                          const char *method,
                          unsigned int method_len);