mirror of
https://github.com/luxfi/crypto.git
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zeekay
bff34dd87a
Brand stays in import path only; symbols, env vars, and exports are brand-neutral. One-release backwards-compat shim reads deprecated LUX_ names with deprecation log. Env: CRYPTO_BACKEND, CRYPTO_DIR, CRYPTO_BUILD_DIR, CRYPTO_LIB_DIR, CRYPTO_LIB are canonical. Rust: idiomatic Secp256k1Status enum; extern fn names dropped lux_ prefix. TS/Python: cryptoAvailable / crypto_available; FFI symbol strings drop lux_ prefix to match renamed C-ABI in luxcpp/crypto. cabi/main.go: //export names drop lux_ prefix (mlkem768_*, mldsa65_*).
89 lines
2.3 KiB
Python
89 lines
2.3 KiB
Python
"""ML-KEM-768 (FIPS 203) — key encapsulation via libluxcrypto."""
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from __future__ import annotations
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import ctypes
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from luxcrypto._ffi import get_lib
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# Sizes (queried from lib at first call, cached)
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_PK_SIZE: int | None = None
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_SK_SIZE: int | None = None
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_CT_SIZE: int | None = None
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_SS_SIZE = 32
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def _sizes() -> tuple[int, int, int]:
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global _PK_SIZE, _SK_SIZE, _CT_SIZE
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if _PK_SIZE is None:
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lib = get_lib()
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_PK_SIZE = lib.mlkem768_pk_size()
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_SK_SIZE = lib.mlkem768_sk_size()
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_CT_SIZE = lib.mlkem768_ct_size()
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return _PK_SIZE, _SK_SIZE, _CT_SIZE
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def keypair() -> tuple[bytes, bytes]:
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"""Generate an ML-KEM-768 key pair.
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Returns (public_key, secret_key).
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"""
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pk_size, sk_size, _ = _sizes()
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lib = get_lib()
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pk_buf = ctypes.create_string_buffer(pk_size)
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sk_buf = ctypes.create_string_buffer(sk_size)
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pk_len = ctypes.c_int(0)
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sk_len = ctypes.c_int(0)
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rc = lib.mlkem768_keypair(pk_buf, ctypes.byref(pk_len), sk_buf, ctypes.byref(sk_len))
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if rc != 0:
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raise RuntimeError(f"mlkem768_keypair failed: {rc}")
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return pk_buf.raw[: pk_len.value], sk_buf.raw[: sk_len.value]
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def encapsulate(public_key: bytes) -> tuple[bytes, bytes]:
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"""Encapsulate a shared secret for the given public key.
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Returns (ciphertext, shared_secret).
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"""
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_, _, ct_size = _sizes()
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lib = get_lib()
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ct_buf = ctypes.create_string_buffer(ct_size)
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ss_buf = ctypes.create_string_buffer(_SS_SIZE)
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ct_len = ctypes.c_int(0)
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ss_len = ctypes.c_int(0)
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rc = lib.mlkem768_encapsulate(
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public_key, len(public_key),
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ct_buf, ctypes.byref(ct_len),
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ss_buf, ctypes.byref(ss_len),
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)
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if rc != 0:
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raise RuntimeError(f"mlkem768_encapsulate failed: {rc}")
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return ct_buf.raw[: ct_len.value], ss_buf.raw[: ss_len.value]
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def decapsulate(secret_key: bytes, ciphertext: bytes) -> bytes:
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"""Decapsulate a shared secret from ciphertext.
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Returns shared_secret.
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"""
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lib = get_lib()
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ss_buf = ctypes.create_string_buffer(_SS_SIZE)
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ss_len = ctypes.c_int(0)
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rc = lib.mlkem768_decapsulate(
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secret_key, len(secret_key),
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ciphertext, len(ciphertext),
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ss_buf, ctypes.byref(ss_len),
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)
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if rc != 0:
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raise RuntimeError(f"mlkem768_decapsulate failed: {rc}")
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return ss_buf.raw[: ss_len.value]
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