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knet_handle_crypto(3) Kronosnet Programmer's Manual knet_handle_crypto(3)


knet_handle_crypto - set up packet cryptographic signing & encryption


#include <libknet.h>

int knet_handle_crypto(
    knet_handle_t                    knet_h,
    struct knet_handle_crypto_cfg   *knet_handle_crypto_cfg



knet_h - pointer to knet_handle_t

knet_handle_crypto_cfg - pointer to a knet_handle_crypto_cfg structure

crypto_model should contain the model name. Currently only "openssl" and "nss" are supported. Setting to "none" will disable crypto.

crypto_cipher_type should contain the cipher algo name. It can be set to "none" to disable encryption. Currently supported by "nss" model: "aes128", "aes192" and "aes256". "openssl" model supports more modes and it strictly depends on the openssl build. See: EVP_get_cipherbyname openssl API call for details.

crypto_hash_type should contain the hashing algo name. It can be set to "none" to disable hashing. Currently supported by "nss" model: "md5", "sha1", "sha256", "sha384" and "sha512". "openssl" model supports more modes and it strictly depends on the openssl build. See: EVP_get_digestbyname openssl API call for details.

private_key will contain the private shared key. It has to be at least KNET_MIN_KEY_LEN long.

private_key_len length of the provided private_key.

Implementation notes/current limitations:

enabling crypto, will increase latency as packets have to processed.

enabling crypto might reduce the overall throughtput due to crypto data overhead.

re-keying is not implemented yet.

private/public key encryption/hashing is not currently planned.

crypto key must be the same for all hosts in the same knet instance.

it is safe to call knet_handle_crypto multiple times at runtime. The last config will be used. IMPORTANT: a call to knet_handle_crypto can fail due to: 1) failure to obtain locking 2) errors to initializing the crypto level. This can happen even in subsequent calls to knet_handle_crypto. A failure in crypto init will restore the previous crypto configuration.


struct knet_handle_crypto_cfg {
    char           crypto_model[16];
    char           crypto_cipher_type[16];
    char           crypto_hash_type[16];
    unsigned char  private_key[KNET_MAX_KEY_LEN];
    unsigned int   private_key_len;


knet_handle_crypto returns: 0 on success

-1 on error and errno is set.

-2 on crypto subsystem initialization error. No errno is provided at the moment (yet).


knet_handle_remove_datafd(3), knet_handle_get_stats(3), knet_host_add(3), knet_handle_pmtud_setfreq(3), knet_handle_pmtud_get(3), knet_host_get_id_by_host_name(3), knet_host_get_status(3), knet_link_add_acl(3), knet_link_get_pong_count(3), knet_link_get_priority(3), knet_handle_free(3), knet_handle_enable_sock_notify(3), knet_handle_get_datafd(3), knet_recv(3), knet_link_get_ping_timers(3), knet_log_get_subsystem_id(3), knet_host_remove(3), knet_host_enable_status_change_notify(3), knet_strtoaddr(3), knet_link_rm_acl(3), knet_send(3), knet_handle_enable_pmtud_notify(3), knet_handle_get_transport_reconnect_interval(3), knet_link_get_enable(3), knet_link_set_priority(3), knet_log_set_loglevel(3), knet_handle_get_channel(3), knet_link_get_config(3), knet_link_get_link_list(3), knet_get_transport_list(3), knet_get_transport_id_by_name(3), knet_log_get_loglevel_id(3), knet_handle_new_ex(3), knet_host_set_name(3), knet_addrtostr(3), knet_handle_setfwd(3), knet_get_compress_list(3), knet_host_set_policy(3), knet_get_transport_name_by_id(3), knet_handle_enable_filter(3), knet_handle_compress(3), knet_link_get_status(3), knet_handle_add_datafd(3), knet_send_sync(3), knet_log_get_loglevel_name(3), knet_handle_enable_access_lists(3), knet_host_get_host_list(3), knet_host_get_policy(3), knet_link_set_enable(3), knet_link_set_pong_count(3), knet_log_get_subsystem_name(3), knet_host_get_name_by_host_id(3), knet_link_clear_config(3), knet_log_get_loglevel(3), knet_handle_new(3), knet_handle_pmtud_getfreq(3), knet_handle_pmtud_set(3), knet_handle_clear_stats(3), knet_link_set_config(3), knet_get_crypto_list(3), knet_handle_set_transport_reconnect_interval(3), knet_link_clear_acl(3), knet_link_set_ping_timers(3), knet_link_insert_acl(3)


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2020-04-23 kronosnet