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Examples Files Home Module AABB3D Module ACCEPT_POOL Module ALLEGRO4 Module ALLEGRO5 Module ANIM_LIB Module ASTAR Module ATLAS_LIB Module AVRO Module CLOCK_SYNC Module COMMONS Module CONFIGFILE Module CYPHER_BASE64 Module CYPHER_VIGENERE Module DEAD_RECKONING Module ENUMS Module EXCEPTIONS Module GAME_ENV Module GIT Module GUI Module HASH_TABLE Module ISOMETRIC_ENGINE Module LIST Module LOG Module LOGNODUP Module LZ4 Module NETWORKING Module NETWORK_MSG Module N_COOKIES Module N_DIFF Module N_DIGEST Module N_DISK_CACHE Module N_DNS Module N_ECC Module N_ENTROPY Module N_FILES Module N_FLUIDS Module N_GUI_COLOR Module N_GUI_COLORWHEEL Module N_GUI_CURVE Module N_GUI_GRID Module N_GUI_POPUP Module N_HEX Module N_HTTP3 Module N_HTTP_COOKIE Module N_HTTP_FORM Module N_HTTP_MIME Module N_HTTP_REQ Module N_HTTP_RESP Module N_HTTP_ROUTER Module N_HTTP_SERVER Module N_ICC Module N_JSON Module N_KAFKA Module N_LINALG Module N_MODULE Module N_OPENSSL_COMPAT Module N_PRETTY Module N_PTH Module N_QUERY Module N_RANDOM Module N_SHA256 Module N_STR Module N_TIFF Module N_TIME Module N_USER Module N_X509 Module N_ZIP Module PARTICLES Module PCRE Module PHYSICS Module SIGNALS Module STACK Module THREADS Module TRAJECTORY Module TREE Module ZLIB Modules Pages Struct A4_BMP Struct A4_TIMER Struct AABB3D Struct ANIM_DATA Struct ANIM_FRAME Struct ANIM_GFX Struct ANIM_LIB Struct ASTAR_BOX Struct ASTAR_CELL Struct ASTAR_GRID Struct ASTAR_HEAP Struct ASTAR_HEAP_NODE Struct ASTAR_NODE Struct ASTAR_PATH Struct AVRO_FIELD Struct AVRO_READER Struct AVRO_SCHEMA Struct BITMAP Struct CALLBACK_DATA Struct CA_CTX Struct CLIENT_JOB Struct CLIENT_STATE Struct CONFIG_FILE Struct CONFIG_FILE_SECTION Struct CYPHER_PARAM Struct DATA Struct DEMO_PANEL Struct DICTIONARY_DEFINITION Struct DICTIONARY_ENTRY Struct DIFF_OUT Struct DIFF_TEXT Struct DRAW_STATE Struct DR_ENTITY Struct DR_STATE Struct DR_VEC3 Struct ExceptionContextList Struct FONT Struct GAME_ENV Struct H2BUF Struct H2_DYN_ENTRY Struct H2_STREAM Struct HASH_NODE Struct HASH_TABLE Struct ISO_DRAW_ENTRY Struct ISO_MAP Struct ISO_PROJECTION Struct ISO_TILE_SEGMENT Struct ISO_TILE_SEGMENTS Struct ISO_VISIBLE_EDGES Struct JS_STATE Struct LEX_ITEM Struct LIST Struct LIST_NODE Struct LOG_LEVELS Struct LexMenu Struct MEMBER Struct MIDI Struct NESTED Struct NETWORK Struct NETWORK_HTTP_INFO Struct NETWORK_POOL Struct NETWORK_SSL_THREAD_PARAMS Struct NETW_ACCEPT_POOL Struct NETW_ACCEPT_POOL_STATS Struct NETW_MSG Struct NETW_SNI_ARG Struct NODE_DATA Struct N_ATLAS Struct N_ATLAS_PAGE Struct N_CLOCK_SYNC Struct N_COOKIE Struct N_COOKIE_JAR Struct N_DIFF_LINE Struct N_DIFF_RESULT Struct N_DISK_CACHE Struct N_ENTROPY_BIT Struct N_ENTROPY_POS Struct N_FILE_INFO Struct N_FLUID Struct N_FLUID_THREAD_PARAMS Struct N_FORM_FIELD Struct N_GIT_COMMIT_INFO Struct N_GIT_REMOTE_AUTH Struct N_GIT_REPO Struct N_GIT_STATUS_ENTRY Struct N_GUI_BUTTON_DATA Struct N_GUI_CHECKBOX_DATA Struct N_GUI_COLOR_PICKER Struct N_GUI_COMBOBOX_DATA Struct N_GUI_CTX Struct N_GUI_CUSTOM_DATA Struct N_GUI_DATAGRID_COL Struct N_GUI_DATAGRID_DATA Struct N_GUI_DROPMENU_DATA Struct N_GUI_DROPMENU_ENTRY Struct N_GUI_GRID_CALLBACKS Struct N_GUI_HEXVIEW_DATA Struct N_GUI_IMAGE_DATA Struct N_GUI_KVTABLE Struct N_GUI_KV_CONTENT Struct N_GUI_KV_ROW Struct N_GUI_LABEL_DATA Struct N_GUI_LISTBOX_DATA Struct N_GUI_LISTITEM Struct N_GUI_MARKDOWNVIEW_DATA Struct N_GUI_MD_FONTS Struct N_GUI_MD_STYLE Struct N_GUI_MEAS_ENTRY Struct N_GUI_MOUSE_EVENT Struct N_GUI_PENDING_GEOM Struct N_GUI_PENDING_WIDGET Struct N_GUI_POPUP Struct N_GUI_PROGRESSBAR_DATA Struct N_GUI_RADIOLIST_DATA Struct N_GUI_SB_TRACK Struct N_GUI_SCROLLBAR_DATA Struct N_GUI_SECTION Struct N_GUI_SECTIONLIST Struct N_GUI_SLIDER_DATA Struct N_GUI_SPLITPANE_DATA Struct N_GUI_STYLE Struct N_GUI_SUGGEST_SINK Struct N_GUI_SYNTAXVIEW_DATA Struct N_GUI_TAB_PANEL Struct N_GUI_TB_BUTTONS Struct N_GUI_TEXTAREA_DATA Struct N_GUI_TEXT_DIMS Struct N_GUI_THEME Struct N_GUI_TREE Struct N_GUI_TREE_NODE Struct N_GUI_TREE_STATE Struct N_GUI_WIDGET Struct N_GUI_WINDOW Struct N_H2_FRAME Struct N_H2_HEADER Struct N_H2_HPACK Struct N_H2_REQUEST Struct N_H2_SERVER Struct N_H2_SETTING Struct N_HTML_ATTR_ Struct N_HTML_FORM Struct N_HTML_TAG_ Struct N_HTTP3_RESPONSE Struct N_HTTP_FIELD Struct N_HTTP_FORM Struct N_HTTP_FORM_MULTIPART Struct N_HTTP_FORM_PART Struct N_HTTP_MULTIPART_PART Struct N_HTTP_REQUEST Struct N_HTTP_RESP Struct N_HTTP_RESPONSE Struct N_HTTP_SERVER Struct N_HTTP_SERVER_CONFIG Struct N_HTTP_SERVER_REQUEST Struct N_HTTP_SERVER_STATS Struct N_HTTP_SET_COOKIE Struct N_HTTP_STREAM Struct N_ISO_CAMERA Struct N_ISO_OBJECT Struct N_KAFKA Struct N_KAFKA_EVENT Struct N_MOCK_SERVER Struct N_MODULE Struct N_PARALLEL_SLICE Struct N_PARALLEL_TEAM Struct N_PARALLEL_WORKER Struct N_PCRE Struct N_PROXY_CFG Struct N_PTH Struct N_PTH_TENSOR Struct N_QUERY Struct N_ROUTE Struct N_ROUTER Struct N_ROUTE_MATCH Struct N_SHA256 Struct N_SOCKET Struct N_SPAWN_PIPE Struct N_SSE_CONN Struct N_SSE_EVENT Struct N_STR Struct N_TIFF Struct N_TIFF_ENTRY Struct N_TIME Struct N_URL Struct N_URL_PARAM Struct N_USER Struct N_USERLIST Struct N_WS_CONN Struct N_WS_FRAME Struct N_WS_MESSAGE Struct N_ZIP_MEMBER Struct OCTREE Struct OCTREE_NODE Struct PARSER Struct PARTICLE Struct PARTICLE_EMITTER Struct PARTICLE_SYSTEM Struct PEER Struct PHYSICS Struct PK_OBJ Struct PK_VM Struct POINT2D Struct POINT3D Struct PRETTY_OUT Struct QNODE Struct QUADTREE Struct QUADTREE_NODE Struct REC Struct RGB Struct SAMPLE Struct SEEN Struct SHARER Struct SRV Struct SRV_ARG Struct STACK Struct STACK_ITEM Struct SYNTAX_RUN Struct THREAD_POOL Struct THREAD_POOL_NODE Struct THREAD_WAITING_PROC Struct TRAJECTORY Struct TRAJECTORY_POINT Struct TREE Struct TREE_NODE Struct TS_LOG Struct WAYPOINT3D Struct WORKER_ARG Struct ZIP_SINK Struct _N_DC_ENTRY Struct _N_DC_GROUP_ENTRY Struct _N_GUI_COLORWHEEL Struct _N_GUI_COLORWHEEL_BLOCK Struct _N_GUI_COLORWHEEL_MOUSE Struct _N_GUI_CURVE Struct _N_GUI_CURVE_BLOCK Struct _N_GUI_CURVE_MOUSE Struct _N_GUI_GRID Struct _N_GUI_POPUP_ENTRY Struct _N_GUI_POPUP_LEVEL Struct _N_GUI_SB_SKIN Struct _N_GUI_TA_STEP Struct _N_GUI_THUMB Struct _N_GUI_WRAP_ACC Struct _compiled Struct _conn Struct _ip_slot Struct _mp_param Struct _n_civil Struct _seg Struct client Struct collector Struct date_vector Struct md_atom Struct md_cells Struct md_hit Struct md_line_ctx Struct mline Struct n_http_req_header Struct n_http_req_limits Struct n_http_request Struct n_markdown_block Struct n_markdown_doc Struct n_markdown_inline Struct n_markdown_span Struct n_reactor_stats Struct n_url_safe Struct n_url_safe_head Struct n_wrap_item Struct producer_state Struct rects Struct reply Struct runner Struct sink Struct tbuf Struct wrap_hit Struct wrap_span Structures Union COORD_VALUE Union HASH_DATA Union NODE_DATA_TYPES Union STACK_DATA dir_310dcdd4703e877a6b99d5dc3fc54d27 dir_68267d1309a1af8e8297ef4c3efbcdba dir_d28a4824dc47e487b107a5db32ef43c4 dir_d44c64559bbebec7f509842c48db8b23 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ex_base64_8c example ex_clock_sync_8c example ex_common_8c example ex_configfile_8c example ex_cookies_8c example ex_crypto_8c example ex_diff_8c example ex_digest_8c example ex_disk_cache_8c example ex_dns_8c example ex_ecc_8c example ex_entropy_8c example ex_exceptions_8c example ex_file_8c example ex_file_copy_8c example ex_fluid_8c example ex_fluid_config_8c example ex_fluid_config_8h example ex_git_8c example ex_gui_8c example ex_gui_bench_8c example ex_gui_button_keys_8c example ex_gui_checkbox_label_8c example ex_gui_checkbox_release_8c example ex_gui_color_picker_8c example ex_gui_colorwheel_8c example ex_gui_combobox_items_8c example ex_gui_combobox_wheel_8c example ex_gui_cursor_8c example ex_gui_curve_8c example ex_gui_custom_8c example ex_gui_custom_mouse_8c example ex_gui_datagrid_8c example ex_gui_datagrid_keys_8c example ex_gui_datagrid_sort_8c example ex_gui_detach_8c example ex_gui_dictionary_8c example ex_gui_display_fallback_8c example ex_gui_double_click_8c example ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c 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n__iso__engine_8h n__json_8c n__json_8h n__kafka_8c n__kafka_8h n__linalg_8c n__linalg_8h n__list_8c n__list_8h n__log_8c n__log_8h n__lz4_8c n__lz4_8h n__markdown_8c n__markdown_8h n__module_8c n__module_8h n__network_8c n__network_8h n__network__accept__pool_8c n__network__accept__pool_8h n__network__msg_8c n__network__msg_8h n__nodup__log_8c n__nodup__log_8h n__openssl__compat_8h n__particles_8c n__particles_8h n__pcre_8c n__pcre_8h n__pretty_8c n__pretty_8h n__pth_8c n__pth_8h n__query_8c n__query_8h n__random_8c n__random_8h n__reactor_8c n__reactor_8h n__sha256_8c n__sha256_8h n__signals_8c n__signals_8h n__ssrf_8c n__ssrf_8h n__stack_8c n__stack_8h n__str_8c n__str_8h n__thread__pool_8c n__thread__pool_8h n__tiff_8c n__tiff_8h n__time_8c n__time_8h n__trajectory_8c n__trajectory_8h n__trees_8c n__trees_8h n__url__safe_8c n__url__safe_8h n__user_8c n__user_8h n__windows_8h n__wrap_8c n__wrap_8h n__x509_8c n__x509_8h n__zip_8c n__zip_8h n__zlib_8c n__zlib_8h nilorea_8h
5 Module N_DIGEST
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

DIGEST: message digests and HMAC

Functions

Name
int n_pbkdf2_hmac_sha256(const unsigned char * pass, size_t pass_len, const unsigned char * salt, size_t salt_len, unsigned int iterations, unsigned char * out, size_t out_len)
derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA256 over iterations rounds (RFC 2898).
int n_pbkdf2_hmac_sha1(const unsigned char * pass, size_t pass_len, const unsigned char * salt, size_t salt_len, unsigned int iterations, unsigned char * out, size_t out_len)
derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA1 over iterations rounds (RFC 2898).
int n_kdf_scrypt(const unsigned char * pass, size_t pass_len, const unsigned char * salt, size_t salt_len, uint64_t n, uint32_t r, uint32_t p, uint64_t maxmem, unsigned char * out, size_t out_len)
scrypt (RFC 7914) of pass with salt and cost parameters n (CPU/memory, a power of two), r (block size) and p (parallelization) into out (out_len bytes); maxmem bounds the working-memory in bytes.
int n_kdf_hkdf_sha256(const unsigned char * ikm, size_t ikm_len, const unsigned char * salt, size_t salt_len, const unsigned char * info, size_t info_len, unsigned char * out, size_t out_len)
HKDF-SHA256 (RFC 5869 extract-then-expand) of ikm with the given salt and info into out (out_len bytes).
int n_hmac_sha512(const unsigned char * key, size_t key_len, const unsigned char * data, size_t data_len, unsigned char * out)
compute HMAC-SHA512 of data under key into out (N_DIGEST_SHA512_LEN bytes).
int n_hmac_sha384(const unsigned char * key, size_t key_len, const unsigned char * data, size_t data_len, unsigned char * out)
compute HMAC-SHA384 of data under key into out (N_DIGEST_SHA384_LEN bytes).
int n_hmac_sha256(const unsigned char * key, size_t key_len, const unsigned char * data, size_t data_len, unsigned char * out)
compute HMAC-SHA256 of data under key into out (N_DIGEST_SHA256_LEN bytes).
int n_hmac_sha1(const unsigned char * key, size_t key_len, const unsigned char * data, size_t data_len, unsigned char * out)
compute HMAC-SHA1 of data under key into out (N_DIGEST_SHA1_LEN bytes).
int n_digest_sha512(const unsigned char * data, size_t len, unsigned char * out)
compute the SHA-512 digest of len bytes of data into out (N_DIGEST_SHA512_LEN bytes).
int n_digest_sha384(const unsigned char * data, size_t len, unsigned char * out)
compute the SHA-384 digest of len bytes of data into out (N_DIGEST_SHA384_LEN bytes).
N_STR * n_digest_sha256_hex(const unsigned char * data, size_t len)
compute the SHA-256 digest of data and return it as a lowercase hex N_STR; free with free_nstr.
int n_digest_sha256(const unsigned char * data, size_t len, unsigned char * out)
compute the SHA-256 digest of len bytes of data into out (N_DIGEST_SHA256_LEN bytes).
int n_digest_sha1(const unsigned char * data, size_t len, unsigned char * out)
compute the SHA-1 digest of len bytes of data into out (N_DIGEST_SHA1_LEN bytes).
int n_digest_md5(const unsigned char * data, size_t len, unsigned char * out)
compute the MD5 digest of len bytes of data into out (N_DIGEST_MD5_LEN bytes).
int n_digest_consttime_equal(const unsigned char * a, const unsigned char * b, size_t len)
constant-time comparison of two equal-length byte buffers (for verifying MACs/signatures without a timing side channel).
int n_digest_blake2b512(const unsigned char * data, size_t len, unsigned char * out)
compute the BLAKE2b-512 digest of len bytes of data into out (N_DIGEST_BLAKE2B512_LEN bytes).
int n_aead_chacha20poly1305_encrypt(const unsigned char * key, const unsigned char * iv, size_t iv_len, const unsigned char * aad, size_t aad_len, const unsigned char * pt, size_t pt_len, unsigned char * out_ct, unsigned char * out_tag)
ChaCha20-Poly1305 (RFC 8439) authenticated encryption.
int n_aead_chacha20poly1305_decrypt(const unsigned char * key, const unsigned char * iv, size_t iv_len, const unsigned char * aad, size_t aad_len, const unsigned char * ct, size_t ct_len, const unsigned char * tag, unsigned char * out_pt)
ChaCha20-Poly1305 authenticated decryption.
int n_aead_aes256gcm_encrypt(const unsigned char * key, const unsigned char * iv, size_t iv_len, const unsigned char * aad, size_t aad_len, const unsigned char * pt, size_t pt_len, unsigned char * out_ct, unsigned char * out_tag)
AES-256-GCM authenticated encryption.
int n_aead_aes256gcm_decrypt(const unsigned char * key, const unsigned char * iv, size_t iv_len, const unsigned char * aad, size_t aad_len, const unsigned char * ct, size_t ct_len, const unsigned char * tag, unsigned char * out_pt)
AES-256-GCM authenticated decryption.

Defines

Name
N_KDF_HAVE_EVP_KDF
1 when the linked library provides the EVP_KDF provider API behind n_kdf_hkdf_sha256() and n_kdf_scrypt() (OpenSSL 3.0+; never on LibreSSL), 0 otherwise
N_DIGEST_SHA512_LEN
output size in bytes of a SHA-512 digest
N_DIGEST_SHA384_LEN
output size in bytes of a SHA-384 digest
N_DIGEST_SHA256_LEN
output size in bytes of a SHA-256 digest
N_DIGEST_SHA1_LEN
output size in bytes of a SHA-1 digest
N_DIGEST_MD5_LEN
output size in bytes of an MD5 digest
N_DIGEST_HAVE_BLAKE2B512
1 when the linked library provides BLAKE2b-512 for n_digest_blake2b512() (OpenSSL 1.1.0+; never on LibreSSL), 0 otherwise
N_DIGEST_BLAKE2B512_LEN
BLAKE2b-512 digest length in bytes.
N_AEAD_HAVE_CHACHA20POLY1305
1 when the linked library provides ChaCha20-Poly1305 for the n_aead_chacha20poly1305_* pair (OpenSSL 1.1.0+, LibreSSL 3.6+), 0 otherwise
N_AEAD_CHACHA20POLY1305_TAG_LEN
authentication tag size in bytes for ChaCha20-Poly1305
N_AEAD_CHACHA20POLY1305_KEY_LEN
key size in bytes for ChaCha20-Poly1305
N_AEAD_AES256GCM_TAG_LEN
authentication tag size in bytes for AES-256-GCM
N_AEAD_AES256GCM_KEY_LEN
key size in bytes for AES-256-GCM

Functions Documentation

function n_pbkdf2_hmac_sha256

int n_pbkdf2_hmac_sha256(
    const unsigned char * pass,
    size_t pass_len,
    const unsigned char * salt,
    size_t salt_len,
    unsigned int iterations,
    unsigned char * out,
    size_t out_len
)

derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA256 over iterations rounds (RFC 2898).

A NULL pass or salt is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_pbkdf2_hmac_sha1

int n_pbkdf2_hmac_sha1(
    const unsigned char * pass,
    size_t pass_len,
    const unsigned char * salt,
    size_t salt_len,
    unsigned int iterations,
    unsigned char * out,
    size_t out_len
)

derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA1 over iterations rounds (RFC 2898).

A NULL pass or salt is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_kdf_scrypt

int n_kdf_scrypt(
    const unsigned char * pass,
    size_t pass_len,
    const unsigned char * salt,
    size_t salt_len,
    uint64_t n,
    uint32_t r,
    uint32_t p,
    uint64_t maxmem,
    unsigned char * out,
    size_t out_len
)

scrypt (RFC 7914) of pass with salt and cost parameters n (CPU/memory, a power of two), r (block size) and p (parallelization) into out (out_len bytes); maxmem bounds the working-memory in bytes.

Requires OpenSSL 3.0+ (EVP_KDF), which N_KDF_HAVE_EVP_KDF reports; returns -1 on older OpenSSL. Returns 0 on success, -1 on error.

function n_kdf_hkdf_sha256

int n_kdf_hkdf_sha256(
    const unsigned char * ikm,
    size_t ikm_len,
    const unsigned char * salt,
    size_t salt_len,
    const unsigned char * info,
    size_t info_len,
    unsigned char * out,
    size_t out_len
)

HKDF-SHA256 (RFC 5869 extract-then-expand) of ikm with the given salt and info into out (out_len bytes).

salt/info may be NULL when their length is 0. Requires OpenSSL 3.0+ (EVP_KDF), which N_KDF_HAVE_EVP_KDF reports; returns -1 on older OpenSSL. Returns 0 on success, -1 on error.

function n_hmac_sha512

int n_hmac_sha512(
    const unsigned char * key,
    size_t key_len,
    const unsigned char * data,
    size_t data_len,
    unsigned char * out
)

compute HMAC-SHA512 of data under key into out (N_DIGEST_SHA512_LEN bytes).

A NULL key or data is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_hmac_sha384

int n_hmac_sha384(
    const unsigned char * key,
    size_t key_len,
    const unsigned char * data,
    size_t data_len,
    unsigned char * out
)

compute HMAC-SHA384 of data under key into out (N_DIGEST_SHA384_LEN bytes).

A NULL key or data is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_hmac_sha256

int n_hmac_sha256(
    const unsigned char * key,
    size_t key_len,
    const unsigned char * data,
    size_t data_len,
    unsigned char * out
)

compute HMAC-SHA256 of data under key into out (N_DIGEST_SHA256_LEN bytes).

A NULL key or data is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_hmac_sha1

int n_hmac_sha1(
    const unsigned char * key,
    size_t key_len,
    const unsigned char * data,
    size_t data_len,
    unsigned char * out
)

compute HMAC-SHA1 of data under key into out (N_DIGEST_SHA1_LEN bytes).

A NULL key or data is treated as empty when its length is 0. Returns 0 on success, -1 on error.

function n_digest_sha512

int n_digest_sha512(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the SHA-512 digest of len bytes of data into out (N_DIGEST_SHA512_LEN bytes).

Returns 0 on success, -1 on error.

function n_digest_sha384

int n_digest_sha384(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the SHA-384 digest of len bytes of data into out (N_DIGEST_SHA384_LEN bytes).

Returns 0 on success, -1 on error.

function n_digest_sha256_hex

N_STR * n_digest_sha256_hex(
    const unsigned char * data,
    size_t len
)

compute the SHA-256 digest of data and return it as a lowercase hex N_STR; free with free_nstr.

Returns NULL on error.

function n_digest_sha256

int n_digest_sha256(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the SHA-256 digest of len bytes of data into out (N_DIGEST_SHA256_LEN bytes).

Returns 0 on success, -1 on error.

function n_digest_sha1

int n_digest_sha1(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the SHA-1 digest of len bytes of data into out (N_DIGEST_SHA1_LEN bytes).

Returns 0 on success, -1 on error.

function n_digest_md5

int n_digest_md5(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the MD5 digest of len bytes of data into out (N_DIGEST_MD5_LEN bytes).

Returns 0 on success, -1 on error.

function n_digest_consttime_equal

int n_digest_consttime_equal(
    const unsigned char * a,
    const unsigned char * b,
    size_t len
)

constant-time comparison of two equal-length byte buffers (for verifying MACs/signatures without a timing side channel).

Returns 1 when equal, 0 otherwise.

function n_digest_blake2b512

int n_digest_blake2b512(
    const unsigned char * data,
    size_t len,
    unsigned char * out
)

compute the BLAKE2b-512 digest of len bytes of data into out (N_DIGEST_BLAKE2B512_LEN bytes).

Returns 0 on success, -1 on error, and always -1 when N_DIGEST_HAVE_BLAKE2B512 is 0.

function n_aead_chacha20poly1305_encrypt

int n_aead_chacha20poly1305_encrypt(
    const unsigned char * key,
    const unsigned char * iv,
    size_t iv_len,
    const unsigned char * aad,
    size_t aad_len,
    const unsigned char * pt,
    size_t pt_len,
    unsigned char * out_ct,
    unsigned char * out_tag
)

ChaCha20-Poly1305 (RFC 8439) authenticated encryption.

key is N_AEAD_CHACHA20POLY1305_KEY_LEN bytes; iv is iv_len bytes (12 recommended); aad may be NULL when aad_len is 0. Writes pt_len ciphertext bytes to out_ct and N_AEAD_CHACHA20POLY1305_TAG_LEN tag bytes to out_tag. Returns 0 on success, -1 on error, and always -1 when N_AEAD_HAVE_CHACHA20POLY1305 is 0.

function n_aead_chacha20poly1305_decrypt

int n_aead_chacha20poly1305_decrypt(
    const unsigned char * key,
    const unsigned char * iv,
    size_t iv_len,
    const unsigned char * aad,
    size_t aad_len,
    const unsigned char * ct,
    size_t ct_len,
    const unsigned char * tag,
    unsigned char * out_pt
)

ChaCha20-Poly1305 authenticated decryption.

Arguments mirror n_aead_chacha20poly1305_encrypt; tag is the N_AEAD_CHACHA20POLY1305_TAG_LEN expected tag. Writes ct_len plaintext bytes to out_pt (which may hold unauthenticated bytes on failure, the caller must discard them). Returns 0 on success (authentic), -1 on error or a tag mismatch, and always -1 when N_AEAD_HAVE_CHACHA20POLY1305 is 0.

function n_aead_aes256gcm_encrypt

int n_aead_aes256gcm_encrypt(
    const unsigned char * key,
    const unsigned char * iv,
    size_t iv_len,
    const unsigned char * aad,
    size_t aad_len,
    const unsigned char * pt,
    size_t pt_len,
    unsigned char * out_ct,
    unsigned char * out_tag
)

AES-256-GCM authenticated encryption.

key is N_AEAD_AES256GCM_KEY_LEN bytes; iv is iv_len bytes (12 recommended); aad may be NULL when aad_len is 0. Writes pt_len ciphertext bytes to out_ct and N_AEAD_AES256GCM_TAG_LEN tag bytes to out_tag. Returns 0 on success, -1 on error.

function n_aead_aes256gcm_decrypt

int n_aead_aes256gcm_decrypt(
    const unsigned char * key,
    const unsigned char * iv,
    size_t iv_len,
    const unsigned char * aad,
    size_t aad_len,
    const unsigned char * ct,
    size_t ct_len,
    const unsigned char * tag,
    unsigned char * out_pt
)

AES-256-GCM authenticated decryption.

Arguments mirror n_aead_aes256gcm_encrypt; tag is the N_AEAD_AES256GCM_TAG_LEN expected tag. Writes ct_len plaintext bytes to out_pt only when the tag verifies. Returns 0 on success (authentic), -1 on error or a tag mismatch.

Macros Documentation

define N_KDF_HAVE_EVP_KDF

#define N_KDF_HAVE_EVP_KDF N_OSSL_HAVE_EVP_KDF

1 when the linked library provides the EVP_KDF provider API behind n_kdf_hkdf_sha256() and n_kdf_scrypt() (OpenSSL 3.0+; never on LibreSSL), 0 otherwise

define N_DIGEST_SHA512_LEN

#define N_DIGEST_SHA512_LEN 64

output size in bytes of a SHA-512 digest

define N_DIGEST_SHA384_LEN

#define N_DIGEST_SHA384_LEN 48

output size in bytes of a SHA-384 digest

define N_DIGEST_SHA256_LEN

#define N_DIGEST_SHA256_LEN 32

output size in bytes of a SHA-256 digest

define N_DIGEST_SHA1_LEN

#define N_DIGEST_SHA1_LEN 20

output size in bytes of a SHA-1 digest

define N_DIGEST_MD5_LEN

#define N_DIGEST_MD5_LEN 16

output size in bytes of an MD5 digest

define N_DIGEST_HAVE_BLAKE2B512

#define N_DIGEST_HAVE_BLAKE2B512 N_OSSL_HAVE_BLAKE2B512

1 when the linked library provides BLAKE2b-512 for n_digest_blake2b512() (OpenSSL 1.1.0+; never on LibreSSL), 0 otherwise

define N_DIGEST_BLAKE2B512_LEN

#define N_DIGEST_BLAKE2B512_LEN 64

BLAKE2b-512 digest length in bytes.

define N_AEAD_HAVE_CHACHA20POLY1305

#define N_AEAD_HAVE_CHACHA20POLY1305 N_OSSL_HAVE_CHACHA20POLY1305

1 when the linked library provides ChaCha20-Poly1305 for the n_aead_chacha20poly1305_* pair (OpenSSL 1.1.0+, LibreSSL 3.6+), 0 otherwise

define N_AEAD_CHACHA20POLY1305_TAG_LEN

#define N_AEAD_CHACHA20POLY1305_TAG_LEN 16

authentication tag size in bytes for ChaCha20-Poly1305

define N_AEAD_CHACHA20POLY1305_KEY_LEN

#define N_AEAD_CHACHA20POLY1305_KEY_LEN 32

key size in bytes for ChaCha20-Poly1305

define N_AEAD_AES256GCM_TAG_LEN

#define N_AEAD_AES256GCM_TAG_LEN 16

authentication tag size in bytes for AES-256-GCM

define N_AEAD_AES256GCM_KEY_LEN

#define N_AEAD_AES256GCM_KEY_LEN 32

key size in bytes for AES-256-GCM

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