libssh2_sign_sk - Create a signature from a FIDO2 authenticator.
#include <libssh2.h>
int
libssh2_sign_sk(LIBSSH2_SESSION *session,
unsigned char **sig,
size_t *sig_len,
const unsigned char *data,
size_t data_len,
void **abstract);
typedef struct _LIBSSH2_PRIVKEY_SK {
int algorithm;
uint8_t flags;
const char *application;
const unsigned char *key_handle;
size_t handle_len;
LIBSSH2_USERAUTH_SK_SIGN_FUNC((*sign_callback));
void **orig_abstract;
} LIBSSH2_PRIVKEY_SK;
session - Session instance as returned by libssh2_session_init_ex(3)
sig - A pointer to a buffer in which to place the signature. The caller is responsible for freeing the signature with LIBSSH2_FREE.
sig_len - A pointer to the length of the sig parameter.
data - The data to sign.
data_len - The length of the data parameter.
abstract - A pointer to a pointer to a LIBSSH2_PRIVKEY_SK. See description below.
Create a signature from a FIDO2 authenticator, using either the sk-ssh-ed25519@openssh.com or sk-ecdsa-sha2-nistp256@openssh.com key exchange algorithms.
The abstract parameter is a pointer to a pointer due to the internal workings of libssh2. The LIBSSH2_PRIVKEY_SK must be completely filled out, and the caller is responsible for all memory management of its fields.
algorithm - The signing algorithm to use. Possible values are LIBSSH2_HOSTKEY_TYPE_ED25519 and LIBSSH2_HOSTKEY_TYPE_ECDSA_256.
flags - A bitmask specifying options for the authenticator. When LIBSSH2_SK_PRESENCE_REQUIRED is set, the authenticator requires a touch. When LIBSSH2_SK_VERIFICATION_REQUIRED is set, the authenticator requires a PIN. Many servers and authenticators do not work properly when LIBSSH2_SK_PRESENCE_REQUIRED is not set.
application - A user-defined string to use as the RP name for the authenticator. Usually "ssh:".
key_handle - The key handle to use for the authenticator's allow list.
handle_len - The length of the key_handle parameter.
abstract - User-defined data. When a PIN is required, use this to pass in the PIN, or a function pointer to retrieve the PIN.
key_handle The decoded key handle from the private key file.
handle_len The length of the key_handle parameter.
sign_callback - Responsible for communicating with the hardware authenticator to generate a signature. On success, the signature information must be placed in the sig_info sig_info parameter and the callback must return 0. On failure, it should return a negative number. See libssh2_userauth_publickey_sk(3) for more information.
orig_abstract - User-defined data. When a PIN is required, use this to pass in the PIN, or a function pointer to retrieve the PIN.
Return 0 on success or negative on failure.
libssh2_session_init_ex(3), libssh2_userauth_publickey_sk
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