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aegis-python/aegis/_loader.py
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LeoVasanko 299586e6ee Cleanup
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"""Dynamic loader for libaegis using CFFI (ABI mode).
This module avoids compiling any C shim. It loads the shared library built by
the project (e.g., build-shared/libaegis.so) or a system-installed libaegis.
Environment variables:
- AEGIS_LIB_PATH: full path to the libaegis shared library to load
- AEGIS_LIB_DIR: directory containing the shared library (libaegis.so)
Exports:
- ffi: a cffi.FFI instance with the libaegis API declared
- lib: the loaded libaegis shared library (ffi.dlopen)
- libc: the C runtime (for posix_memalign/free on POSIX)
- alloc_aligned(size, alignment): return (void*) pointer with requested alignment
"""
import os
import sys
from typing import Any
from cffi import FFI
try:
# ctypes is only used to resolve libc reliably across platforms
import ctypes.util as _ctypes_util # type: ignore
except Exception: # pragma: no cover - very unlikely to happen
_ctypes_util = None # type: ignore[assignment]
ffi = FFI()
# Public API from headers (aegis.h and all aegis variant headers). Keep it macro-free.
ffi.cdef(
r"""
typedef unsigned char uint8_t;
typedef unsigned long size_t;
/* aegis.h */
int aegis_init(void);
int aegis_verify_16(const uint8_t *x, const uint8_t *y);
int aegis_verify_32(const uint8_t *x, const uint8_t *y);
/* aegis128l.h */
typedef struct {
/* CRYPTO_ALIGN(32) */ uint8_t opaque[256];
} aegis128l_state;
typedef struct {
/* CRYPTO_ALIGN(32) */ uint8_t opaque[384];
} aegis128l_mac_state;
size_t aegis128l_keybytes(void);
size_t aegis128l_npubbytes(void);
size_t aegis128l_abytes_min(void);
size_t aegis128l_abytes_max(void);
size_t aegis128l_tailbytes_max(void);
int aegis128l_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128l_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128l_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis128l_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis128l_state_init(aegis128l_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis128l_state_encrypt_update(aegis128l_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis128l_state_encrypt_detached_final(aegis128l_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis128l_state_encrypt_final(aegis128l_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis128l_state_decrypt_detached_update(aegis128l_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis128l_state_decrypt_detached_final(aegis128l_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis128l_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis128l_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis128l_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis128l_mac_init(aegis128l_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis128l_mac_update(aegis128l_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis128l_mac_final(aegis128l_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis128l_mac_verify(aegis128l_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis128l_mac_reset(aegis128l_mac_state *st_);
void aegis128l_mac_state_clone(aegis128l_mac_state *dst, const aegis128l_mac_state *src);
/* aegis128x2.h */
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[448];
} aegis128x2_state;
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[704];
} aegis128x2_mac_state;
size_t aegis128x2_keybytes(void);
size_t aegis128x2_npubbytes(void);
size_t aegis128x2_abytes_min(void);
size_t aegis128x2_abytes_max(void);
size_t aegis128x2_tailbytes_max(void);
int aegis128x2_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128x2_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128x2_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis128x2_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis128x2_state_init(aegis128x2_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis128x2_state_encrypt_update(aegis128x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis128x2_state_encrypt_detached_final(aegis128x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis128x2_state_encrypt_final(aegis128x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis128x2_state_decrypt_detached_update(aegis128x2_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis128x2_state_decrypt_detached_final(aegis128x2_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis128x2_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis128x2_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis128x2_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis128x2_mac_init(aegis128x2_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis128x2_mac_update(aegis128x2_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis128x2_mac_final(aegis128x2_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis128x2_mac_verify(aegis128x2_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis128x2_mac_reset(aegis128x2_mac_state *st_);
void aegis128x2_mac_state_clone(aegis128x2_mac_state *dst, const aegis128x2_mac_state *src);
/* aegis128x4.h */
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[832];
} aegis128x4_state;
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[1344];
} aegis128x4_mac_state;
size_t aegis128x4_keybytes(void);
size_t aegis128x4_npubbytes(void);
size_t aegis128x4_abytes_min(void);
size_t aegis128x4_abytes_max(void);
size_t aegis128x4_tailbytes_max(void);
int aegis128x4_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128x4_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis128x4_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis128x4_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis128x4_state_init(aegis128x4_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis128x4_state_encrypt_update(aegis128x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis128x4_state_encrypt_detached_final(aegis128x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis128x4_state_encrypt_final(aegis128x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis128x4_state_decrypt_detached_update(aegis128x4_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis128x4_state_decrypt_detached_final(aegis128x4_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis128x4_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis128x4_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis128x4_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis128x4_mac_init(aegis128x4_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis128x4_mac_update(aegis128x4_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis128x4_mac_final(aegis128x4_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis128x4_mac_verify(aegis128x4_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis128x4_mac_reset(aegis128x4_mac_state *st_);
void aegis128x4_mac_state_clone(aegis128x4_mac_state *dst, const aegis128x4_mac_state *src);
/* aegis256.h */
typedef struct {
/* CRYPTO_ALIGN(16) */ uint8_t opaque[192];
} aegis256_state;
typedef struct {
/* CRYPTO_ALIGN(16) */ uint8_t opaque[288];
} aegis256_mac_state;
size_t aegis256_keybytes(void);
size_t aegis256_npubbytes(void);
size_t aegis256_abytes_min(void);
size_t aegis256_abytes_max(void);
size_t aegis256_tailbytes_max(void);
int aegis256_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis256_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis256_state_init(aegis256_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis256_state_encrypt_update(aegis256_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis256_state_encrypt_detached_final(aegis256_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis256_state_encrypt_final(aegis256_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis256_state_decrypt_detached_update(aegis256_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis256_state_decrypt_detached_final(aegis256_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis256_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis256_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis256_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis256_mac_init(aegis256_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis256_mac_update(aegis256_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis256_mac_final(aegis256_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis256_mac_verify(aegis256_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis256_mac_reset(aegis256_mac_state *st_);
void aegis256_mac_state_clone(aegis256_mac_state *dst, const aegis256_mac_state *src);
/* aegis256x2.h */
typedef struct {
/* CRYPTO_ALIGN(32) */ uint8_t opaque[320];
} aegis256x2_state;
typedef struct {
/* CRYPTO_ALIGN(32) */ uint8_t opaque[512];
} aegis256x2_mac_state;
size_t aegis256x2_keybytes(void);
size_t aegis256x2_npubbytes(void);
size_t aegis256x2_abytes_min(void);
size_t aegis256x2_abytes_max(void);
size_t aegis256x2_tailbytes_max(void);
int aegis256x2_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256x2_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256x2_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis256x2_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis256x2_state_init(aegis256x2_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis256x2_state_encrypt_update(aegis256x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis256x2_state_encrypt_detached_final(aegis256x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis256x2_state_encrypt_final(aegis256x2_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis256x2_state_decrypt_detached_update(aegis256x2_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis256x2_state_decrypt_detached_final(aegis256x2_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis256x2_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis256x2_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis256x2_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis256x2_mac_init(aegis256x2_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis256x2_mac_update(aegis256x2_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis256x2_mac_final(aegis256x2_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis256x2_mac_verify(aegis256x2_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis256x2_mac_reset(aegis256x2_mac_state *st_);
void aegis256x2_mac_state_clone(aegis256x2_mac_state *dst, const aegis256x2_mac_state *src);
/* aegis256x4.h */
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[576];
} aegis256x4_state;
typedef struct {
/* CRYPTO_ALIGN(64) */ uint8_t opaque[960];
} aegis256x4_mac_state;
size_t aegis256x4_keybytes(void);
size_t aegis256x4_npubbytes(void);
size_t aegis256x4_abytes_min(void);
size_t aegis256x4_abytes_max(void);
size_t aegis256x4_tailbytes_max(void);
int aegis256x4_encrypt_detached(uint8_t *c, uint8_t *mac, size_t maclen, const uint8_t *m,
size_t mlen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256x4_decrypt_detached(uint8_t *m, const uint8_t *c, size_t clen, const uint8_t *mac,
size_t maclen, const uint8_t *ad, size_t adlen, const uint8_t *npub,
const uint8_t *k);
int aegis256x4_encrypt(uint8_t *c, size_t maclen, const uint8_t *m, size_t mlen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
int aegis256x4_decrypt(uint8_t *m, const uint8_t *c, size_t clen, size_t maclen, const uint8_t *ad,
size_t adlen, const uint8_t *npub, const uint8_t *k);
void aegis256x4_state_init(aegis256x4_state *st_, const uint8_t *ad, size_t adlen,
const uint8_t *npub, const uint8_t *k);
int aegis256x4_state_encrypt_update(aegis256x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, const uint8_t *m, size_t mlen);
int aegis256x4_state_encrypt_detached_final(aegis256x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, uint8_t *mac, size_t maclen);
int aegis256x4_state_encrypt_final(aegis256x4_state *st_, uint8_t *c, size_t clen_max,
size_t *written, size_t maclen);
int aegis256x4_state_decrypt_detached_update(aegis256x4_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *c, size_t clen);
int aegis256x4_state_decrypt_detached_final(aegis256x4_state *st_, uint8_t *m, size_t mlen_max,
size_t *written, const uint8_t *mac, size_t maclen);
void aegis256x4_stream(uint8_t *out, size_t len, const uint8_t *npub, const uint8_t *k);
void aegis256x4_encrypt_unauthenticated(uint8_t *c, const uint8_t *m, size_t mlen,
const uint8_t *npub, const uint8_t *k);
void aegis256x4_decrypt_unauthenticated(uint8_t *m, const uint8_t *c, size_t clen,
const uint8_t *npub, const uint8_t *k);
void aegis256x4_mac_init(aegis256x4_mac_state *st_, const uint8_t *k, const uint8_t *npub);
int aegis256x4_mac_update(aegis256x4_mac_state *st_, const uint8_t *m, size_t mlen);
int aegis256x4_mac_final(aegis256x4_mac_state *st_, uint8_t *mac, size_t maclen);
int aegis256x4_mac_verify(aegis256x4_mac_state *st_, const uint8_t *mac, size_t maclen);
void aegis256x4_mac_reset(aegis256x4_mac_state *st_);
void aegis256x4_mac_state_clone(aegis256x4_mac_state *dst, const aegis256x4_mac_state *src);
/* libc bits for aligned allocation on POSIX */
int posix_memalign(void **memptr, size_t alignment, size_t size);
void free(void *ptr);
"""
)
def _platform_lib_name() -> str:
if sys.platform.startswith("linux"):
return "libaegis.so"
if sys.platform == "darwin":
return "libaegis.dylib"
if os.name == "nt":
return "aegis.dll"
return "libaegis.so"
def _load_libaegis():
# Let the dynamic loader search system paths
try:
lib = ffi.dlopen(_platform_lib_name())
return lib
except Exception as e:
hint = "Install libaegis system-wide."
raise OSError(f"Could not load libaegis: {e}\n{hint}")
def _load_libc():
# Use ctypes.util to find a usable libc name; fallback to None-dlopen on POSIX
if _ctypes_util is not None:
libc_name = _ctypes_util.find_library("c") # type: ignore[attr-defined]
if libc_name:
try:
return ffi.dlopen(libc_name)
except Exception:
pass
# Fallback: try process globals (works on many Unix platforms)
try:
return ffi.dlopen(None)
except Exception as e:
raise OSError(f"Unable to load libc for aligned allocation: {e}")
lib: Any = _load_libaegis()
libc: Any = _load_libc()
# Initialize CPU feature selection (recommended by the library)
try:
lib.aegis_init()
except Exception:
# Non-fatal; functions will still work, maybe slower
pass
def alloc_aligned(size: int, alignment: int = 64):
"""Allocate aligned memory via posix_memalign(); returns a void* cdata.
The returned pointer must be freed with libc.free(). Attach a GC finalizer
at call sites using ffi.gc(ptr, libc.free) after casting to the target type.
"""
memptr = ffi.new("void **")
rc = libc.posix_memalign(memptr, alignment, size)
if rc != 0 or memptr[0] == ffi.NULL:
raise MemoryError(f"posix_memalign({alignment}, {size}) failed with rc={rc}")
return memptr[0]
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