libssh2_userauth_publickey_frommemory - Man Page

authenticate a session with a public key, read from memory


#include <libssh2.h>

int libssh2_userauth_publickey_frommemory(LIBSSH2_SESSION *session,
                                           const char *username,
                                           size_t username_len,
                                           const char *publickeydata,
                                           size_t publickeydata_len,
                                           const char *privatekeydata,
                                           size_t privatekeydata_len,
                                           const char *passphrase);


This function allows to authenticate a session with a public key read from memory. It's only supported when libssh2 is backed by OpenSSL. session - Session instance as returned by libssh2_session_init_ex(3)

username - Remote user name to authenticate as.

username_len - Length of username.

publickeydata - Buffer containing the contents of a public key file.

publickeydata_len - Length of public key data.

privatekeydata - Buffer containing the contents of a private key file.

privatekeydata_len - Length of private key data.

passphrase - Passphrase to use when decoding private key file.

Attempt public key authentication using a PEM encoded private key file stored in memory.

Return Value

Return 0 on success or negative on failure.  It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.


LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.


LIBSSH2_ERROR_PUBLICKEY_UNVERIFIED - The username/public key combination was invalid.

LIBSSH2_ERROR_AUTHENTICATION_FAILED - Authentication using the supplied public key was not accepted.


libssh2_userauth_publickey_frommemory was added in libssh2 1.6.0

See Also



1 Sep 2014 libssh2 1.5 libssh2 manual