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cpython/Modules/hmacmodule.c

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/*
* @author Bénédikt Tran
*
* Implement the HMAC algorithm as described by RFC 2104 using HACL*.
*
* Using HACL* implementation implicitly assumes that the caller wants
* a formally verified implementation. In particular, only algorithms
* given by their names will be recognized.
*
* Some algorithms exposed by `_hashlib` such as truncated SHA-2-512-224/256
* are not yet implemented by the HACL* project. Nonetheless, the supported
* HMAC algorithms form a subset of those supported by '_hashlib'.
*/
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_hashtable.h"
#include "pycore_strhex.h" // _Py_strhex()
/*
* Taken from blake2module.c. In the future, detection of SIMD support
* should be delegated to https://github.com/python/cpython/pull/125011.
*/
#if defined(__x86_64__) && defined(__GNUC__)
# include <cpuid.h>
#elif defined(_M_X64)
# include <intrin.h>
#endif
#if defined(__APPLE__) && defined(__arm64__)
# undef HACL_CAN_COMPILE_SIMD128
# undef HACL_CAN_COMPILE_SIMD256
#endif
// Small mismatch between the variable names Python defines as part of configure
// at the ones HACL* expects to be set in order to enable those headers.
#define HACL_CAN_COMPILE_VEC128 HACL_CAN_COMPILE_SIMD128
#define HACL_CAN_COMPILE_VEC256 HACL_CAN_COMPILE_SIMD256
#include "_hacl/Hacl_HMAC.h"
#include "_hacl/Hacl_Streaming_HMAC.h" // Hacl_Agile_Hash_* identifiers
#include "_hacl/Hacl_Streaming_Types.h" // Hacl_Streaming_Types_error_code
#include <stdbool.h>
#include "hashlib.h"
// --- Reusable error messages ------------------------------------------------
static inline void
set_invalid_key_length_error(void)
{
(void)PyErr_Format(PyExc_OverflowError,
"key length exceeds %u",
UINT32_MAX);
}
static inline void
set_invalid_msg_length_error(void)
{
(void)PyErr_Format(PyExc_OverflowError,
"message length exceeds %u",
UINT32_MAX);
}
// --- HMAC underlying hash function static information -----------------------
#define UINT32_MAX_AS_SSIZE_T ((Py_ssize_t)UINT32_MAX)
#define Py_hmac_hash_max_block_size 144
#define Py_hmac_hash_max_digest_size 64
/* MD-5 */
// HACL_HID = md5
#define Py_hmac_md5_block_size 64
#define Py_hmac_md5_digest_size 16
#define Py_hmac_md5_compute_func Hacl_HMAC_compute_md5
/* SHA-1 family */
// HACL_HID = sha1
#define Py_hmac_sha1_block_size 64
#define Py_hmac_sha1_digest_size 20
#define Py_hmac_sha1_compute_func Hacl_HMAC_compute_sha1
/* SHA-2 family */
// HACL_HID = sha2_224
#define Py_hmac_sha2_224_block_size 64
#define Py_hmac_sha2_224_digest_size 28
#define Py_hmac_sha2_224_compute_func Hacl_HMAC_compute_sha2_224
// HACL_HID = sha2_256
#define Py_hmac_sha2_256_block_size 64
#define Py_hmac_sha2_256_digest_size 32
#define Py_hmac_sha2_256_compute_func Hacl_HMAC_compute_sha2_256
// HACL_HID = sha2_384
#define Py_hmac_sha2_384_block_size 128
#define Py_hmac_sha2_384_digest_size 48
#define Py_hmac_sha2_384_compute_func Hacl_HMAC_compute_sha2_384
// HACL_HID = sha2_512
#define Py_hmac_sha2_512_block_size 128
#define Py_hmac_sha2_512_digest_size 64
#define Py_hmac_sha2_512_compute_func Hacl_HMAC_compute_sha2_512
/* SHA-3 family */
// HACL_HID = sha3_224
#define Py_hmac_sha3_224_block_size 144
#define Py_hmac_sha3_224_digest_size 28
#define Py_hmac_sha3_224_compute_func Hacl_HMAC_compute_sha3_224
// HACL_HID = sha3_256
#define Py_hmac_sha3_256_block_size 136
#define Py_hmac_sha3_256_digest_size 32
#define Py_hmac_sha3_256_compute_func Hacl_HMAC_compute_sha3_256
// HACL_HID = sha3_384
#define Py_hmac_sha3_384_block_size 104
#define Py_hmac_sha3_384_digest_size 48
#define Py_hmac_sha3_384_compute_func Hacl_HMAC_compute_sha3_384
// HACL_HID = sha3_512
#define Py_hmac_sha3_512_block_size 72
#define Py_hmac_sha3_512_digest_size 64
#define Py_hmac_sha3_512_compute_func Hacl_HMAC_compute_sha3_512
/* Blake2 family */
// HACL_HID = blake2s_32
#define Py_hmac_blake2s_32_block_size 64
#define Py_hmac_blake2s_32_digest_size 32
#define Py_hmac_blake2s_32_compute_func Hacl_HMAC_compute_blake2s_32
// HACL_HID = blake2b_32
#define Py_hmac_blake2b_32_block_size 128
#define Py_hmac_blake2b_32_digest_size 64
#define Py_hmac_blake2b_32_compute_func Hacl_HMAC_compute_blake2b_32
/* Enumeration indicating the underlying hash function used by HMAC. */
typedef enum HMAC_Hash_Kind {
Py_hmac_kind_hash_unknown = -1,
#define DECL_HACL_HMAC_HASH_KIND(NAME, HACL_NAME) \
Py_hmac_kind_hmac_ ## NAME = Hacl_Agile_Hash_ ## HACL_NAME,
/* MD5 */
DECL_HACL_HMAC_HASH_KIND(md5, MD5)
/* SHA-1 */
DECL_HACL_HMAC_HASH_KIND(sha1, SHA1)
/* SHA-2 family */
DECL_HACL_HMAC_HASH_KIND(sha2_224, SHA2_224)
DECL_HACL_HMAC_HASH_KIND(sha2_256, SHA2_256)
DECL_HACL_HMAC_HASH_KIND(sha2_384, SHA2_384)
DECL_HACL_HMAC_HASH_KIND(sha2_512, SHA2_512)
/* SHA-3 family */
DECL_HACL_HMAC_HASH_KIND(sha3_224, SHA3_224)
DECL_HACL_HMAC_HASH_KIND(sha3_256, SHA3_256)
DECL_HACL_HMAC_HASH_KIND(sha3_384, SHA3_384)
DECL_HACL_HMAC_HASH_KIND(sha3_512, SHA3_512)
/* Blake family */
DECL_HACL_HMAC_HASH_KIND(blake2s_32, Blake2S_32)
DECL_HACL_HMAC_HASH_KIND(blake2b_32, Blake2B_32)
/* Blake runtime family (should not be used statically) */
DECL_HACL_HMAC_HASH_KIND(vectorized_blake2s_32, Blake2S_128)
DECL_HACL_HMAC_HASH_KIND(vectorized_blake2b_32, Blake2B_256)
#undef DECL_HACL_HMAC_HASH_KIND
} HMAC_Hash_Kind;
typedef Hacl_Streaming_Types_error_code hacl_errno_t;
/* Function pointer type for 1-shot HACL* HMAC functions. */
typedef void
(*HACL_HMAC_compute_func)(uint8_t *out,
uint8_t *key, uint32_t keylen,
uint8_t *msg, uint32_t msglen);
/* Function pointer type for 1-shot HACL* HMAC CPython AC functions. */
typedef PyObject *
(*PyAC_HMAC_compute_func)(PyObject *module, PyObject *key, PyObject *msg);
/*
* HACL* HMAC minimal interface.
*/
typedef struct py_hmac_hacl_api {
HACL_HMAC_compute_func compute;
PyAC_HMAC_compute_func compute_py;
} py_hmac_hacl_api;
#if PY_SSIZE_T_MAX > UINT32_MAX
#define Py_HMAC_SSIZE_LARGER_THAN_UINT32
#endif
/*
* Assert that 'LEN' can be safely casted to uint32_t.
*
* The 'LEN' parameter should be convertible to Py_ssize_t.
*/
#ifdef Py_HMAC_SSIZE_LARGER_THAN_UINT32
#define Py_CHECK_HACL_UINT32_T_LENGTH(LEN) \
do { \
assert((Py_ssize_t)(LEN) <= UINT32_MAX_AS_SSIZE_T); \
} while (0)
#else
#define Py_CHECK_HACL_UINT32_T_LENGTH(LEN)
#endif
/*
* Call the HACL* HMAC-HASH update function on the given data.
*
* The magnitude of 'LEN' is not checked and thus 'LEN' must be
* safely convertible to a uint32_t value.
*/
#define Py_HMAC_HACL_UPDATE_CALL(HACL_STATE, BUF, LEN) \
Hacl_Streaming_HMAC_update(HACL_STATE, BUF, (uint32_t)(LEN))
/*
* Call the HACL* HMAC-HASH update function on the given data.
*
* On DEBUG builds, the 'ERRACTION' statements are executed if
* the update() call returned a non-successful HACL* exit code.
*
* The buffer 'BUF' and its length 'LEN' are left untouched.
*
* The formal signature of this macro is:
*
* (HACL_HMAC_state *, uint8_t *, uint32_t, PyObject *, (C statements))
*/
#ifndef NDEBUG
#define Py_HMAC_HACL_UPDATE_ONCE( \
HACL_STATE, BUF, LEN, \
ALGORITHM, ERRACTION \
) \
do { \
Py_CHECK_HACL_UINT32_T_LENGTH(LEN); \
hacl_errno_t code = Py_HMAC_HACL_UPDATE_CALL(HACL_STATE, BUF, LEN); \
if (_hacl_convert_errno(code, (ALGORITHM)) < 0) { \
ERRACTION; \
} \
} while (0)
#else
#define Py_HMAC_HACL_UPDATE_ONCE( \
HACL_STATE, BUF, LEN, \
_ALGORITHM, _ERRACTION \
) \
do { \
(void)Py_HMAC_HACL_UPDATE_CALL(HACL_STATE, BUF, (LEN)); \
} while (0)
#endif
/*
* Repetivively call the HACL* HMAC-HASH update function on the given
* data until the buffer length 'LEN' is strictly less than UINT32_MAX.
*
* On builds with PY_SSIZE_T_MAX <= UINT32_MAX, this is a no-op.
*
* The buffer 'BUF' (resp. 'LEN') is advanced (resp. decremented)
* by UINT32_MAX after each update. On DEBUG builds, each update()
* call is verified and the 'ERRACTION' statements are executed if
* a non-successful HACL* exit code is being returned.
*
* In particular, 'BUF' and 'LEN' must be variable names and not
* expressions on their own.
*
* The formal signature of this macro is:
*
* (HACL_HMAC_state *, uint8_t *, C integer, PyObject *, (C statements))
*/
#ifdef Py_HMAC_SSIZE_LARGER_THAN_UINT32
#define Py_HMAC_HACL_UPDATE_LOOP( \
HACL_STATE, BUF, LEN, \
ALGORITHM, ERRACTION \
) \
do { \
while ((Py_ssize_t)LEN > UINT32_MAX_AS_SSIZE_T) { \
Py_HMAC_HACL_UPDATE_ONCE(HACL_STATE, BUF, UINT32_MAX, \
ALGORITHM, ERRACTION); \
BUF += UINT32_MAX; \
LEN -= UINT32_MAX; \
} \
} while (0)
#else
#define Py_HMAC_HACL_UPDATE_LOOP( \
HACL_STATE, BUF, LEN, \
_ALGORITHM, _ERRACTION \
)
#endif
/*
* Perform the HMAC-HASH update() operation in a streaming fashion.
*
* The formal signature of this macro is:
*
* (HACL_HMAC_state *, uint8_t *, C integer, PyObject *, (C statements))
*/
#define Py_HMAC_HACL_UPDATE( \
HACL_STATE, BUF, LEN, \
ALGORITHM, ERRACTION \
) \
do { \
Py_HMAC_HACL_UPDATE_LOOP(HACL_STATE, BUF, LEN, \
ALGORITHM, ERRACTION); \
Py_HMAC_HACL_UPDATE_ONCE(HACL_STATE, BUF, LEN, \
ALGORITHM, ERRACTION); \
} while (0)
/*
* HMAC underlying hash function static information.
*/
typedef struct py_hmac_hinfo {
/*
* Name of the hash function used by the HACL* HMAC module.
*
* This name may differ from the hashlib names. For instance,
* SHA-2/224 is named "sha2_224" instead of "sha224" as it is
* done by 'hashlib'.
*/
const char *name;
/* hash function information */
HMAC_Hash_Kind kind;
uint32_t block_size;
uint32_t digest_size;
/* HACL* HMAC API */
py_hmac_hacl_api api;
/*
* Cached field storing the 'hashlib_name' field as a Python string.
*
* This field is NULL by default in the items of "py_hmac_static_hinfo"
* but will be populated when creating the module's state "hinfo_table".
*/
PyObject *display_name;
const char *hashlib_name; /* hashlib preferred name (default: name) */
Py_ssize_t refcnt;
} py_hmac_hinfo;
// --- HMAC module state ------------------------------------------------------
typedef struct hmacmodule_state {
_Py_hashtable_t *hinfo_table;
PyObject *unknown_hash_error;
/* HMAC object type */
PyTypeObject *hmac_type;
/* interned strings */
PyObject *str_lower;
bool can_run_simd128;
bool can_run_simd256;
} hmacmodule_state;
static inline hmacmodule_state *
get_hmacmodule_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (hmacmodule_state *)state;
}
static inline hmacmodule_state *
get_hmacmodule_state_by_cls(PyTypeObject *cls)
{
void *state = PyType_GetModuleState(cls);
assert(state != NULL);
return (hmacmodule_state *)state;
}
// --- HMAC Object ------------------------------------------------------------
typedef Hacl_Streaming_HMAC_agile_state HACL_HMAC_state;
typedef struct HMACObject {
PyObject_HEAD
bool use_mutex;
PyMutex mutex;
// Hash function information
PyObject *name; // rendered name (exact unicode object)
HMAC_Hash_Kind kind; // can be used for runtime dispatch (must be known)
uint32_t block_size;
uint32_t digest_size;
py_hmac_hacl_api api;
// HMAC HACL* internal state.
HACL_HMAC_state *state;
} HMACObject;
#define HMACObject_CAST(op) ((HMACObject *)(op))
// --- HMAC module clinic configuration ---------------------------------------
/*[clinic input]
module _hmac
class _hmac.HMAC "HMACObject *" "clinic_state()->hmac_type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=c8bab73fde49ba8a]*/
#define clinic_state() (get_hmacmodule_state_by_cls(Py_TYPE(self)))
#include "clinic/hmacmodule.c.h"
#undef clinic_state
// --- Helpers ----------------------------------------------------------------
//
// The helpers have the following naming conventions:
//
// - Helpers with the "_hacl" prefix are thin wrappers around HACL* functions.
// Buffer lengths given as inputs should fit on 32-bit integers.
//
// - Helpers with the "hmac_" prefix act on HMAC objects and accept buffers
// whose length fits on 32-bit or 64-bit integers (depending on the host
// machine).
/*
* Assert that a HMAC hash kind is a static kind.
*
* A "static" kind is specified in the 'py_hmac_static_hinfo'
* table and is always independent of the host CPUID features.
*/
#ifndef NDEBUG
static void
assert_is_static_hmac_hash_kind(HMAC_Hash_Kind kind)
{
switch (kind) {
case Py_hmac_kind_hash_unknown: {
Py_FatalError("HMAC hash kind must be a known kind");
return;
}
case Py_hmac_kind_hmac_vectorized_blake2s_32:
case Py_hmac_kind_hmac_vectorized_blake2b_32: {
Py_FatalError("HMAC hash kind must not be a vectorized kind");
return;
}
default:
return;
}
}
#else
static inline void
assert_is_static_hmac_hash_kind(HMAC_Hash_Kind Py_UNUSED(kind)) {}
#endif
/*
* Convert a HMAC hash static kind into a runtime kind.
*
* A "runtime" kind is derived from a static kind and depends
* on the host CPUID features. In particular, this is the kind
* that a HMAC object internally stores.
*/
static HMAC_Hash_Kind
narrow_hmac_hash_kind(hmacmodule_state *state, HMAC_Hash_Kind kind)
{
switch (kind) {
case Py_hmac_kind_hmac_blake2s_32: {
#if HACL_CAN_COMPILE_SIMD128
if (state->can_run_simd128) {
return Py_hmac_kind_hmac_vectorized_blake2s_32;
}
#endif
return kind;
}
case Py_hmac_kind_hmac_blake2b_32: {
#if HACL_CAN_COMPILE_SIMD256
if (state->can_run_simd256) {
return Py_hmac_kind_hmac_vectorized_blake2b_32;
}
#endif
return kind;
}
default:
return kind;
}
}
/*
* Handle the HACL* exit code.
*
* If 'code' represents a successful operation, this returns 0.
* Otherwise, this sets an appropriate exception and returns -1.
*/
static int
_hacl_convert_errno(hacl_errno_t code, PyObject *algorithm)
{
switch (code) {
case Hacl_Streaming_Types_Success: {
return 0;
}
case Hacl_Streaming_Types_InvalidAlgorithm: {
// only makes sense if an algorithm is known at call time
assert(algorithm != NULL);
assert(PyUnicode_CheckExact(algorithm));
PyErr_Format(PyExc_ValueError, "invalid algorithm: %U", algorithm);
return -1;
}
case Hacl_Streaming_Types_InvalidLength: {
PyErr_SetString(PyExc_ValueError, "invalid length");
return -1;
}
case Hacl_Streaming_Types_MaximumLengthExceeded: {
PyErr_SetString(PyExc_OverflowError, "maximum length exceeded");
return -1;
}
case Hacl_Streaming_Types_OutOfMemory: {
PyErr_NoMemory();
return -1;
}
default: {
PyErr_Format(PyExc_RuntimeError,
"HACL* internal routine failed with error code: %d",
code);
return -1;
}
}
}
/*
* Return a new HACL* internal state or return NULL on failure.
*
* An appropriate exception is set if the state cannot be created.
*/
static HACL_HMAC_state *
_hacl_hmac_state_new(HMAC_Hash_Kind kind, uint8_t *key, uint32_t len)
{
assert(kind != Py_hmac_kind_hash_unknown);
HACL_HMAC_state *state = NULL;
hacl_errno_t retcode = Hacl_Streaming_HMAC_malloc_(kind, key, len, &state);
if (_hacl_convert_errno(retcode, NULL) < 0) {
assert(state == NULL);
return NULL;
}
return state;
}
/*
* Free the HACL* internal state.
*/
static inline void
_hacl_hmac_state_free(HACL_HMAC_state *state)
{
if (state != NULL) {
Hacl_Streaming_HMAC_free(state);
}
}
/* Static information used to construct the hash table. */
static const py_hmac_hinfo py_hmac_static_hinfo[] = {
#define Py_HMAC_HINFO_HACL_API(HACL_HID) \
{ \
/* one-shot helpers */ \
.compute = &Py_hmac_## HACL_HID ##_compute_func, \
.compute_py = &_hmac_compute_## HACL_HID ##_impl, \
}
#define Py_HMAC_HINFO_ENTRY(HACL_HID, HLIB_NAME) \
{ \
.name = Py_STRINGIFY(HACL_HID), \
.kind = Py_hmac_kind_hmac_ ## HACL_HID, \
.block_size = Py_hmac_## HACL_HID ##_block_size, \
.digest_size = Py_hmac_## HACL_HID ##_digest_size, \
.api = Py_HMAC_HINFO_HACL_API(HACL_HID), \
.display_name = NULL, \
.hashlib_name = HLIB_NAME, \
.refcnt = 0, \
}
/* MD5 */
Py_HMAC_HINFO_ENTRY(md5, NULL),
/* SHA-1 */
Py_HMAC_HINFO_ENTRY(sha1, NULL),
/* SHA-2 family */
Py_HMAC_HINFO_ENTRY(sha2_224, "sha224"),
Py_HMAC_HINFO_ENTRY(sha2_256, "sha256"),
Py_HMAC_HINFO_ENTRY(sha2_384, "sha384"),
Py_HMAC_HINFO_ENTRY(sha2_512, "sha512"),
/* SHA-3 family */
Py_HMAC_HINFO_ENTRY(sha3_224, NULL),
Py_HMAC_HINFO_ENTRY(sha3_256, NULL),
Py_HMAC_HINFO_ENTRY(sha3_384, NULL),
Py_HMAC_HINFO_ENTRY(sha3_512, NULL),
/* Blake family */
Py_HMAC_HINFO_ENTRY(blake2s_32, "blake2s"),
Py_HMAC_HINFO_ENTRY(blake2b_32, "blake2b"),
#undef Py_HMAC_HINFO_ENTRY
#undef Py_HMAC_HINFO_HACL_API
/* sentinel */
{
NULL, Py_hmac_kind_hash_unknown, 0, 0,
{NULL, NULL},
NULL, NULL,
0,
},
};
/*
* Check whether 'name' is a known HMAC hash function name,
* storing the corresponding static information in 'info'.
*
* This function always succeeds and never set an exception.
*/
static inline bool
find_hash_info_by_utf8name(hmacmodule_state *state,
const char *name,
const py_hmac_hinfo **info)
{
assert(name != NULL);
*info = _Py_hashtable_get(state->hinfo_table, name);
return *info != NULL;
}
/*
* Find the corresponding HMAC hash function static information by its name.
*
* On error, propagate the exception, set 'info' to NULL and return -1.
*
* If no correspondence exists, set 'info' to NULL and return 0.
* Otherwise, set 'info' to the deduced information and return 1.
*
* Parameters
*
* state The HMAC module state.
* name The hash function name.
* info The deduced information, if any.
*/
static int
find_hash_info_by_name(hmacmodule_state *state,
PyObject *name,
const py_hmac_hinfo **info)
{
const char *utf8name = PyUnicode_AsUTF8(name);
if (utf8name == NULL) {
goto error;
}
if (find_hash_info_by_utf8name(state, utf8name, info)) {
return 1;
}
// try to find an alternative using the lowercase name
PyObject *lower = PyObject_CallMethodNoArgs(name, state->str_lower);
if (lower == NULL) {
goto error;
}
const char *utf8lower = PyUnicode_AsUTF8(lower);
if (utf8lower == NULL) {
Py_DECREF(lower);
goto error;
}
int found = find_hash_info_by_utf8name(state, utf8lower, info);
Py_DECREF(lower);
return found;
error:
*info = NULL;
return -1;
}
/*
* Find the corresponding HMAC hash function static information.
*
* On error, propagate the exception, set 'info' to NULL and return -1.
*
* If no correspondence exists, set 'info' to NULL and return 0.
* Otherwise, set 'info' to the deduced information and return 1.
*
* Parameters
*
* state The HMAC module state.
* hash_info_ref An input to hashlib.new().
* info The deduced information, if any.
*/
static int
find_hash_info_impl(hmacmodule_state *state,
PyObject *hash_info_ref,
const py_hmac_hinfo **info)
{
if (PyUnicode_Check(hash_info_ref)) {
return find_hash_info_by_name(state, hash_info_ref, info);
}
// NOTE(picnixz): For now, we only support named algorithms.
// In the future, we need to decide whether 'hashlib.openssl_md5'
// would make sense as an alias to 'md5' and how to remove OpenSSL.
*info = NULL;
return 0;
}
/*
* Find the corresponding HMAC hash function static information.
*
* If nothing can be found or if an error occurred, return NULL
* with an exception set. Otherwise return a non-NULL object.
*/
static const py_hmac_hinfo *
find_hash_info(hmacmodule_state *state, PyObject *hash_info_ref)
{
const py_hmac_hinfo *info = NULL;
int rc = find_hash_info_impl(state, hash_info_ref, &info);
// The code below could be simplfied with only 'rc == 0' case,
// but we are deliberately verbose to ease future improvements.
if (rc < 0) {
return NULL;
}
if (rc == 0) {
PyErr_Format(state->unknown_hash_error,
"unsupported hash type: %R", hash_info_ref);
return NULL;
}
assert(info != NULL);
return info;
}
/* Check that the buffer length fits on a uint32_t. */
static inline int
has_uint32_t_buffer_length(const Py_buffer *buffer)
{
#ifdef Py_HMAC_SSIZE_LARGER_THAN_UINT32
return buffer->len <= UINT32_MAX_AS_SSIZE_T;
#else
return 1;
#endif
}
// --- HMAC object ------------------------------------------------------------
/*
* Use the HMAC information 'info' to populate the corresponding fields.
*
* The real 'kind' for BLAKE-2 is obtained once and depends on both static
* capabilities (supported compiler flags) and runtime CPUID features.
*/
static void
hmac_set_hinfo(hmacmodule_state *state,
HMACObject *self, const py_hmac_hinfo *info)
{
assert(info->display_name != NULL);
self->name = Py_NewRef(info->display_name);
assert_is_static_hmac_hash_kind(info->kind);
self->kind = narrow_hmac_hash_kind(state, info->kind);
assert(info->block_size <= Py_hmac_hash_max_block_size);
self->block_size = info->block_size;
assert(info->digest_size <= Py_hmac_hash_max_digest_size);
self->digest_size = info->digest_size;
assert(info->api.compute != NULL);
assert(info->api.compute_py != NULL);
self->api = info->api;
}
/*
* Create initial HACL* internal state with the given key.
*
* This function MUST only be called by the HMAC object constructor
* and after hmac_set_hinfo() has been called, lest the behaviour is
* undefined.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static int
hmac_new_initial_state(HMACObject *self, uint8_t *key, Py_ssize_t len)
{
assert(key != NULL);
#ifdef Py_HMAC_SSIZE_LARGER_THAN_UINT32
// Technically speaking, we could hash the key to make it small
// but it would require to call the hash functions ourselves and
// not rely on HACL* implementation anymore. As such, we explicitly
// reject keys that do not fit on 32 bits until HACL* handles them.
if (len > UINT32_MAX_AS_SSIZE_T) {
set_invalid_key_length_error();
return -1;
}
#endif
assert(self->kind != Py_hmac_kind_hash_unknown);
// cast to uint32_t is now safe even on 32-bit platforms
self->state = _hacl_hmac_state_new(self->kind, key, (uint32_t)len);
// _hacl_hmac_state_new() may set an exception on error
return self->state == NULL ? -1 : 0;
}
/*
* Feed initial data.
*
* This function MUST only be called by the HMAC object constructor
* and after hmac_set_hinfo() and hmac_new_initial_state() have been
* called, lest the behaviour is undefined.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static int
hmac_feed_initial_data(HMACObject *self, uint8_t *msg, Py_ssize_t len)
{
assert(self->name != NULL);
assert(self->state != NULL);
if (len == 0) {
// do nothing if the buffer is empty
return 0;
}
if (len < HASHLIB_GIL_MINSIZE) {
Py_HMAC_HACL_UPDATE(self->state, msg, len, self->name, return -1);
return 0;
}
int res = 0;
Py_BEGIN_ALLOW_THREADS
Py_HMAC_HACL_UPDATE(self->state, msg, len, self->name, goto error);
goto done;
#ifndef NDEBUG
error:
res = -1;
#else
Py_UNREACHABLE();
#endif
done:
Py_END_ALLOW_THREADS
return res;
}
/*[clinic input]
_hmac.new
key as keyobj: object
msg as msgobj: object(c_default="NULL") = None
digestmod as hash_info_ref: object(c_default="NULL") = None
Return a new HMAC object.
[clinic start generated code]*/
static PyObject *
_hmac_new_impl(PyObject *module, PyObject *keyobj, PyObject *msgobj,
PyObject *hash_info_ref)
/*[clinic end generated code: output=7c7573a427d58758 input=92fc7c0a00707d42]*/
{
hmacmodule_state *state = get_hmacmodule_state(module);
if (hash_info_ref == NULL) {
PyErr_SetString(PyExc_TypeError,
"new() missing 1 required argument 'digestmod'");
return NULL;
}
const py_hmac_hinfo *info = find_hash_info(state, hash_info_ref);
if (info == NULL) {
return NULL;
}
HMACObject *self = PyObject_GC_New(HMACObject, state->hmac_type);
if (self == NULL) {
return NULL;
}
HASHLIB_INIT_MUTEX(self);
hmac_set_hinfo(state, self, info);
int rc;
// Create the HACL* internal state with the given key.
Py_buffer key;
GET_BUFFER_VIEW_OR_ERROR(keyobj, &key, goto error_on_key);
rc = hmac_new_initial_state(self, key.buf, key.len);
PyBuffer_Release(&key);
if (rc < 0) {
goto error;
}
// Feed the internal state the initial message if any.
if (msgobj != NULL && msgobj != Py_None) {
Py_buffer msg;
GET_BUFFER_VIEW_OR_ERROR(msgobj, &msg, goto error);
rc = hmac_feed_initial_data(self, msg.buf, msg.len);
PyBuffer_Release(&msg);
#ifndef NDEBUG
if (rc < 0) {
goto error;
}
#else
(void)rc;
#endif
}
assert(rc == 0);
PyObject_GC_Track(self);
return (PyObject *)self;
error_on_key:
self->state = NULL;
error:
Py_DECREF(self);
return NULL;
}
/*
* Copy HMAC hash information from 'src' to 'out'.
*/
static void
hmac_copy_hinfo(HMACObject *out, const HMACObject *src)
{
assert(src->name != NULL);
out->name = Py_NewRef(src->name);
assert(src->kind != Py_hmac_kind_hash_unknown);
out->kind = src->kind;
assert(src->block_size <= Py_hmac_hash_max_block_size);
out->block_size = src->block_size;
assert(src->digest_size <= Py_hmac_hash_max_digest_size);
out->digest_size = src->digest_size;
assert(src->api.compute != NULL);
assert(src->api.compute_py != NULL);
out->api = src->api;
}
/*
* Copy the HMAC internal state from 'src' to 'out'.
*
* The internal state of 'out' must not already exist.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static int
hmac_copy_state(HMACObject *out, const HMACObject *src)
{
assert(src->state != NULL);
out->state = Hacl_Streaming_HMAC_copy(src->state);
if (out->state == NULL) {
PyErr_NoMemory();
return -1;
}
return 0;
}
/*[clinic input]
_hmac.HMAC.copy
cls: defining_class
Return a copy ("clone") of the HMAC object.
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_copy_impl(HMACObject *self, PyTypeObject *cls)
/*[clinic end generated code: output=a955bfa55b65b215 input=17b2c0ad0b147e36]*/
{
hmacmodule_state *state = get_hmacmodule_state_by_cls(cls);
HMACObject *copy = PyObject_GC_New(HMACObject, state->hmac_type);
if (copy == NULL) {
return NULL;
}
ENTER_HASHLIB(self);
/* copy hash information */
hmac_copy_hinfo(copy, self);
/* copy internal state */
int rc = hmac_copy_state(copy, self);
LEAVE_HASHLIB(self);
if (rc < 0) {
Py_DECREF(copy);
return NULL;
}
HASHLIB_INIT_MUTEX(copy);
PyObject_GC_Track(copy);
return (PyObject *)copy;
}
/*
* Update the HMAC object with the given buffer.
*
* This unconditionally acquires the lock on the HMAC object.
*
* On DEBUG builds, each update() call is verified.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static int
hmac_update_state_with_lock(HMACObject *self, uint8_t *buf, Py_ssize_t len)
{
int res = 0;
Py_BEGIN_ALLOW_THREADS
PyMutex_Lock(&self->mutex); // unconditionally acquire a lock
Py_HMAC_HACL_UPDATE(self->state, buf, len, self->name, goto error);
goto done;
#ifndef NDEBUG
error:
res = -1;
#else
Py_UNREACHABLE();
#endif
done:
PyMutex_Unlock(&self->mutex);
Py_END_ALLOW_THREADS
return res;
}
/*
* Update the HMAC object with the given buffer.
*
* This conditionally acquires the lock on the HMAC object.
*
* On DEBUG builds, each update() call is verified.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static int
hmac_update_state_cond_lock(HMACObject *self, uint8_t *buf, Py_ssize_t len)
{
ENTER_HASHLIB(self); // conditionally acquire a lock
Py_HMAC_HACL_UPDATE(self->state, buf, len, self->name, goto error);
LEAVE_HASHLIB(self);
return 0;
#ifndef NDEBUG
error:
LEAVE_HASHLIB(self);
return -1;
#else
Py_UNREACHABLE();
#endif
}
/*
* Update the internal HMAC state with the given buffer.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*/
static inline int
hmac_update_state(HMACObject *self, uint8_t *buf, Py_ssize_t len)
{
assert(buf != 0);
assert(len >= 0);
return len == 0
? 0 /* nothing to do */
: len < HASHLIB_GIL_MINSIZE
? hmac_update_state_cond_lock(self, buf, len)
: hmac_update_state_with_lock(self, buf, len);
}
/*[clinic input]
_hmac.HMAC.update
msg as msgobj: object
Update the HMAC object with the given message.
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_update_impl(HMACObject *self, PyObject *msgobj)
/*[clinic end generated code: output=962134ada5e55985 input=7c0ea830efb03367]*/
{
Py_buffer msg;
GET_BUFFER_VIEW_OR_ERROUT(msgobj, &msg);
int rc = hmac_update_state(self, msg.buf, msg.len);
PyBuffer_Release(&msg);
return rc < 0 ? NULL : Py_None;
}
/*
* Compute the HMAC-HASH digest from the internal HACL* state.
*
* At least 'self->digest_size' bytes should be available
* in the 'digest' pointed memory area.
*
* Return 0 on success; otherwise, set an exception and return -1 on failure.
*
* Note: this function may raise a MemoryError.
*/
static int
hmac_digest_compute_cond_lock(HMACObject *self, uint8_t *digest)
{
assert(digest != NULL);
hacl_errno_t rc;
ENTER_HASHLIB(self); // conditionally acquire a lock
rc = Hacl_Streaming_HMAC_digest(self->state, digest, self->digest_size);
LEAVE_HASHLIB(self);
assert(
rc == Hacl_Streaming_Types_Success ||
rc == Hacl_Streaming_Types_OutOfMemory
);
return _hacl_convert_errno(rc, NULL);
}
/*[clinic input]
_hmac.HMAC.digest
Return the digest of the bytes passed to the update() method so far.
This method may raise a MemoryError.
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_digest_impl(HMACObject *self)
/*[clinic end generated code: output=5bf3cc5862d26ada input=a70feb0b8e2bbe7d]*/
{
assert(self->digest_size <= Py_hmac_hash_max_digest_size);
uint8_t digest[Py_hmac_hash_max_digest_size];
if (hmac_digest_compute_cond_lock(self, digest) < 0) {
return NULL;
}
return PyBytes_FromStringAndSize((const char *)digest, self->digest_size);
}
/*[clinic input]
_hmac.HMAC.hexdigest
Return hexadecimal digest of the bytes passed to the update() method so far.
This may be used to exchange the value safely in email or other non-binary
environments.
This method may raise a MemoryError.
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_hexdigest_impl(HMACObject *self)
/*[clinic end generated code: output=6659807a09ae14ec input=493b2db8013982b9]*/
{
assert(self->digest_size <= Py_hmac_hash_max_digest_size);
uint8_t digest[Py_hmac_hash_max_digest_size];
if (hmac_digest_compute_cond_lock(self, digest) < 0) {
return NULL;
}
return _Py_strhex((const char *)digest, self->digest_size);
}
/*[clinic input]
@getter
_hmac.HMAC.name
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_name_get_impl(HMACObject *self)
/*[clinic end generated code: output=ae693f09778d96d9 input=41c2c5dd1cf47fbc]*/
{
assert(self->name != NULL);
return PyUnicode_FromFormat("hmac-%U", self->name);
}
/*[clinic input]
@getter
_hmac.HMAC.block_size
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_block_size_get_impl(HMACObject *self)
/*[clinic end generated code: output=52cb11dee4e80cae input=9dda6b8d43e995b4]*/
{
return PyLong_FromUInt32(self->block_size);
}
/*[clinic input]
@getter
_hmac.HMAC.digest_size
[clinic start generated code]*/
static PyObject *
_hmac_HMAC_digest_size_get_impl(HMACObject *self)
/*[clinic end generated code: output=22eeca1010ac6255 input=5622bb2840025b5a]*/
{
return PyLong_FromUInt32(self->digest_size);
}
static PyObject *
HMACObject_repr(PyObject *op)
{
HMACObject *self = HMACObject_CAST(op);
assert(self->name != NULL);
return PyUnicode_FromFormat("<%U HMAC object @ %p>", self->name, self);
}
static int
HMACObject_clear(PyObject *op)
{
HMACObject *self = HMACObject_CAST(op);
Py_CLEAR(self->name);
_hacl_hmac_state_free(self->state);
self->state = NULL;
return 0;
}
static void
HMACObject_dealloc(PyObject *op)
{
PyTypeObject *type = Py_TYPE(op);
PyObject_GC_UnTrack(op);
(void)HMACObject_clear(op);
type->tp_free(op);
Py_DECREF(type);
}
static int
HMACObject_traverse(PyObject *op, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(op));
return 0;
}
static PyMethodDef HMACObject_methods[] = {
_HMAC_HMAC_COPY_METHODDEF
_HMAC_HMAC_UPDATE_METHODDEF
_HMAC_HMAC_DIGEST_METHODDEF
_HMAC_HMAC_HEXDIGEST_METHODDEF
{NULL, NULL, 0, NULL} /* sentinel */
};
static PyGetSetDef HMACObject_getsets[] = {
_HMAC_HMAC_NAME_GETSETDEF
_HMAC_HMAC_BLOCK_SIZE_GETSETDEF
_HMAC_HMAC_DIGEST_SIZE_GETSETDEF
{NULL, NULL, NULL, NULL, NULL} /* sentinel */
};
static PyType_Slot HMACObject_Type_slots[] = {
{Py_tp_repr, HMACObject_repr},
{Py_tp_methods, HMACObject_methods},
{Py_tp_getset, HMACObject_getsets},
{Py_tp_clear, HMACObject_clear},
{Py_tp_dealloc, HMACObject_dealloc},
{Py_tp_traverse, HMACObject_traverse},
{0, NULL} /* sentinel */
};
static PyType_Spec HMAC_Type_spec = {
.name = "_hmac.HMAC",
.basicsize = sizeof(HMACObject),
.flags = Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_HEAPTYPE
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC,
.slots = HMACObject_Type_slots,
};
// --- One-shot HMAC-HASH interface -------------------------------------------
/*[clinic input]
_hmac.compute_digest
key: object
msg: object
digest: object
[clinic start generated code]*/
static PyObject *
_hmac_compute_digest_impl(PyObject *module, PyObject *key, PyObject *msg,
PyObject *digest)
/*[clinic end generated code: output=c519b7c4c9f57333 input=1c2bfc2cd8598574]*/
{
hmacmodule_state *state = get_hmacmodule_state(module);
const py_hmac_hinfo *info = find_hash_info(state, digest);
if (info == NULL) {
return NULL;
}
assert(info->api.compute_py != NULL);
return info->api.compute_py(module, key, msg);
}
/*
* One-shot HMAC-HASH using the given HACL_HID.
*
* The length of the key and message buffers must not exceed UINT32_MAX,
* lest an OverflowError is raised. The Python implementation takes care
* of dispatching to the OpenSSL implementation in this case.
*/
#define Py_HMAC_HACL_ONESHOT(HACL_HID, KEY, MSG) \
do { \
Py_buffer keyview, msgview; \
GET_BUFFER_VIEW_OR_ERROUT((KEY), &keyview); \
if (!has_uint32_t_buffer_length(&keyview)) { \
PyBuffer_Release(&keyview); \
set_invalid_key_length_error(); \
return NULL; \
} \
GET_BUFFER_VIEW_OR_ERROR((MSG), &msgview, \
PyBuffer_Release(&keyview); \
return NULL); \
if (!has_uint32_t_buffer_length(&msgview)) { \
PyBuffer_Release(&msgview); \
PyBuffer_Release(&keyview); \
set_invalid_msg_length_error(); \
return NULL; \
} \
uint8_t out[Py_hmac_## HACL_HID ##_digest_size]; \
Py_hmac_## HACL_HID ##_compute_func( \
out, \
(uint8_t *)keyview.buf, (uint32_t)keyview.len, \
(uint8_t *)msgview.buf, (uint32_t)msgview.len \
); \
PyBuffer_Release(&msgview); \
PyBuffer_Release(&keyview); \
return PyBytes_FromStringAndSize( \
(const char *)out, \
Py_hmac_## HACL_HID ##_digest_size \
); \
} while (0)
/*[clinic input]
_hmac.compute_md5
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_md5_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=7837a4ceccbbf636 input=77a4b774c7d61218]*/
{
Py_HMAC_HACL_ONESHOT(md5, key, msg);
}
/*[clinic input]
_hmac.compute_sha1
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha1_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=79fd7689c83691d8 input=3b64dccc6bdbe4ba]*/
{
Py_HMAC_HACL_ONESHOT(sha1, key, msg);
}
/*[clinic input]
_hmac.compute_sha224 as _hmac_compute_sha2_224
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha2_224_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=7f21f1613e53979e input=a1a75f25f23449af]*/
{
Py_HMAC_HACL_ONESHOT(sha2_224, key, msg);
}
/*[clinic input]
_hmac.compute_sha256 as _hmac_compute_sha2_256
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha2_256_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=d4a291f7d9a82459 input=5c9ccf2df048ace3]*/
{
Py_HMAC_HACL_ONESHOT(sha2_256, key, msg);
}
/*[clinic input]
_hmac.compute_sha384 as _hmac_compute_sha2_384
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha2_384_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=f211fa26e3700c27 input=2fee2c14766af231]*/
{
Py_HMAC_HACL_ONESHOT(sha2_384, key, msg);
}
/*[clinic input]
_hmac.compute_sha512 as _hmac_compute_sha2_512
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha2_512_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=d5c20373762cecca input=3371eaac315c7864]*/
{
Py_HMAC_HACL_ONESHOT(sha2_512, key, msg);
}
/*[clinic input]
_hmac.compute_sha3_224
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha3_224_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=a242ccac9ad9c22b input=d0ab0c7d189c3d87]*/
{
Py_HMAC_HACL_ONESHOT(sha3_224, key, msg);
}
/*[clinic input]
_hmac.compute_sha3_256
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha3_256_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=b539dbb61af2fe0b input=f05d7b6364b35d02]*/
{
Py_HMAC_HACL_ONESHOT(sha3_256, key, msg);
}
/*[clinic input]
_hmac.compute_sha3_384
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha3_384_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=5eb372fb5c4ffd3a input=d842d393e7aa05ae]*/
{
Py_HMAC_HACL_ONESHOT(sha3_384, key, msg);
}
/*[clinic input]
_hmac.compute_sha3_512
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_sha3_512_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=154bcbf8c2eacac1 input=166fe5baaeaabfde]*/
{
Py_HMAC_HACL_ONESHOT(sha3_512, key, msg);
}
/*[clinic input]
_hmac.compute_blake2s_32
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_blake2s_32_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=cfc730791bc62361 input=d22c36e7fe31a985]*/
{
Py_HMAC_HACL_ONESHOT(blake2s_32, key, msg);
}
/*[clinic input]
_hmac.compute_blake2b_32
key: object
msg: object
/
[clinic start generated code]*/
static PyObject *
_hmac_compute_blake2b_32_impl(PyObject *module, PyObject *key, PyObject *msg)
/*[clinic end generated code: output=765c5c4fb9124636 input=4a35ee058d172f4b]*/
{
Py_HMAC_HACL_ONESHOT(blake2b_32, key, msg);
}
// --- HMAC module methods ----------------------------------------------------
static PyMethodDef hmacmodule_methods[] = {
_HMAC_NEW_METHODDEF
/* one-shot dispatcher */
_HMAC_COMPUTE_DIGEST_METHODDEF
/* one-shot methods */
_HMAC_COMPUTE_MD5_METHODDEF
_HMAC_COMPUTE_SHA1_METHODDEF
_HMAC_COMPUTE_SHA2_224_METHODDEF
_HMAC_COMPUTE_SHA2_256_METHODDEF
_HMAC_COMPUTE_SHA2_384_METHODDEF
_HMAC_COMPUTE_SHA2_512_METHODDEF
_HMAC_COMPUTE_SHA3_224_METHODDEF
_HMAC_COMPUTE_SHA3_256_METHODDEF
_HMAC_COMPUTE_SHA3_384_METHODDEF
_HMAC_COMPUTE_SHA3_512_METHODDEF
_HMAC_COMPUTE_BLAKE2S_32_METHODDEF
_HMAC_COMPUTE_BLAKE2B_32_METHODDEF
{NULL, NULL, 0, NULL} /* sentinel */
};
// --- HMAC static information table ------------------------------------------
static inline Py_uhash_t
py_hmac_hinfo_ht_hash(const void *name)
{
return Py_HashBuffer(name, strlen((const char *)name));
}
static inline int
py_hmac_hinfo_ht_comp(const void *a, const void *b)
{
return strcmp((const char *)a, (const char *)b) == 0;
}
static void
py_hmac_hinfo_ht_free(void *hinfo)
{
py_hmac_hinfo *entry = (py_hmac_hinfo *)hinfo;
assert(entry->display_name != NULL);
if (--(entry->refcnt) == 0) {
Py_CLEAR(entry->display_name);
PyMem_Free(hinfo);
}
}
/*
* Equivalent to table.setdefault(key, info).
*
* Return 1 if a new item has been created, 0 if 'key' is NULL or
* an entry 'table[key]' existed, and -1 if a memory error occurs.
*
* To reduce memory footprint, 'info' may be a borrowed reference,
* namely, multiple keys can be associated with the same 'info'.
*
* In particular, resources owned by 'info' must only be released
* when a single key associated with 'info' remains.
*/
static int
py_hmac_hinfo_ht_add(_Py_hashtable_t *table, const void *key, void *info)
{
if (key == NULL || _Py_hashtable_get_entry(table, key) != NULL) {
return 0;
}
if (_Py_hashtable_set(table, key, info) < 0) {
assert(!PyErr_Occurred());
PyErr_NoMemory();
return -1;
}
return 1;
}
/*
* Create a new hashtable from the static 'py_hmac_static_hinfo' object,
* or set an exception and return NULL if an error occurs.
*/
static _Py_hashtable_t *
py_hmac_hinfo_ht_new(void)
{
_Py_hashtable_t *table = _Py_hashtable_new_full(
py_hmac_hinfo_ht_hash,
py_hmac_hinfo_ht_comp,
NULL,
py_hmac_hinfo_ht_free,
NULL
);
if (table == NULL) {
assert(!PyErr_Occurred());
PyErr_NoMemory();
return NULL;
}
for (const py_hmac_hinfo *e = py_hmac_static_hinfo; e->name != NULL; e++) {
/*
* The real kind of a HMAC object is obtained only once and is
* derived from the kind of the 'py_hmac_hinfo' that could be
* found by its name.
*
* Since 'vectorized_blake2{s,b}_32' depend on the runtime CPUID
* features, we should not create 'py_hmac_hinfo' entries for them.
*/
assert_is_static_hmac_hash_kind(e->kind);
py_hmac_hinfo *value = PyMem_Malloc(sizeof(py_hmac_hinfo));
if (value == NULL) {
PyErr_NoMemory();
goto error;
}
memcpy(value, e, sizeof(py_hmac_hinfo));
assert(value->display_name == NULL);
value->refcnt = 0;
#define Py_HMAC_HINFO_LINK(KEY) \
do { \
int rc = py_hmac_hinfo_ht_add(table, KEY, value); \
if (rc < 0) { \
PyMem_Free(value); \
goto error; \
} \
else if (rc == 1) { \
value->refcnt++; \
} \
} while (0)
Py_HMAC_HINFO_LINK(e->name);
Py_HMAC_HINFO_LINK(e->hashlib_name);
#undef Py_HMAC_HINFO_LINK
assert(value->refcnt > 0);
assert(value->display_name == NULL);
value->display_name = PyUnicode_FromString(
/* display name is synchronized with hashlib's name */
e->hashlib_name == NULL ? e->name : e->hashlib_name
);
if (value->display_name == NULL) {
PyMem_Free(value);
goto error;
}
}
return table;
error:
_Py_hashtable_destroy(table);
return NULL;
}
// --- HMAC module initialization and finalization functions ------------------
static int
hmacmodule_init_hash_info_table(hmacmodule_state *state)
{
// py_hmac_hinfo_ht_new() sets an exception on error
state->hinfo_table = py_hmac_hinfo_ht_new();
return state->hinfo_table == NULL ? -1 : 0;
}
static int
hmacmodule_init_exceptions(PyObject *module, hmacmodule_state *state)
{
#define ADD_EXC(ATTR, NAME, BASE) \
do { \
state->ATTR = PyErr_NewException("_hmac." NAME, BASE, NULL); \
if (state->ATTR == NULL) { \
return -1; \
} \
if (PyModule_AddObjectRef(module, NAME, state->ATTR) < 0) { \
return -1; \
} \
} while (0)
ADD_EXC(unknown_hash_error, "UnknownHashError", PyExc_ValueError);
#undef ADD_EXC
return 0;
}
static int
hmacmodule_init_hmac_type(PyObject *module, hmacmodule_state *state)
{
state->hmac_type = (PyTypeObject *)PyType_FromModuleAndSpec(module,
&HMAC_Type_spec,
NULL);
if (state->hmac_type == NULL) {
return -1;
}
if (PyModule_AddType(module, state->hmac_type) < 0) {
return -1;
}
return 0;
}
static int
hmacmodule_init_strings(hmacmodule_state *state)
{
#define ADD_STR(ATTR, STRING) \
do { \
state->ATTR = PyUnicode_FromString(STRING); \
if (state->ATTR == NULL) { \
return -1; \
} \
} while (0)
ADD_STR(str_lower, "lower");
#undef ADD_STR
return 0;
}
static int
hmacmodule_init_globals(PyObject *module, hmacmodule_state *state)
{
#define ADD_INT_CONST(NAME, VALUE) \
do { \
if (PyModule_AddIntConstant(module, (NAME), (VALUE)) < 0) { \
return -1; \
} \
} while (0)
ADD_INT_CONST("_GIL_MINSIZE", HASHLIB_GIL_MINSIZE);
#undef ADD_INT_CONST
return 0;
}
static void
hmacmodule_init_cpu_features(hmacmodule_state *state)
{
int eax1 = 0, ebx1 = 0, ecx1 = 0, edx1 = 0;
int eax7 = 0, ebx7 = 0, ecx7 = 0, edx7 = 0;
#if defined(__x86_64__) && defined(__GNUC__)
__cpuid_count(1, 0, eax1, ebx1, ecx1, edx1);
__cpuid_count(7, 0, eax7, ebx7, ecx7, edx7);
#elif defined(_M_X64)
int info1[4] = { 0 };
__cpuidex(info1, 1, 0);
eax1 = info1[0], ebx1 = info1[1], ecx1 = info1[2], edx1 = info1[3];
int info7[4] = { 0 };
__cpuidex(info7, 7, 0);
eax7 = info7[0], ebx7 = info7[1], ecx7 = info7[2], edx7 = info7[3];
#endif
// fmt: off
(void)eax1; (void)ebx1; (void)ecx1; (void)edx1;
(void)eax7; (void)ebx7; (void)ecx7; (void)edx7;
// fmt: on
#define EBX_AVX2 (1 << 5)
#define ECX_SSE3 (1 << 0)
#define ECX_SSSE3 (1 << 9)
#define ECX_SSE4_1 (1 << 19)
#define ECX_SSE4_2 (1 << 20)
#define ECX_AVX (1 << 28)
#define EDX_SSE (1 << 25)
#define EDX_SSE2 (1 << 26)
#define EDX_CMOV (1 << 15)
bool avx = (ecx1 & ECX_AVX) != 0;
bool avx2 = (ebx7 & EBX_AVX2) != 0;
bool sse = (edx1 & EDX_SSE) != 0;
bool sse2 = (edx1 & EDX_SSE2) != 0;
bool cmov = (edx1 & EDX_CMOV) != 0;
bool sse3 = (ecx1 & ECX_SSE3) != 0;
bool sse41 = (ecx1 & ECX_SSE4_1) != 0;
bool sse42 = (ecx1 & ECX_SSE4_2) != 0;
#undef EDX_CMOV
#undef EDX_SSE2
#undef EDX_SSE
#undef ECX_AVX
#undef ECX_SSE4_2
#undef ECX_SSE4_1
#undef ECX_SSSE3
#undef ECX_SSE3
#undef EBX_AVX2
#if HACL_CAN_COMPILE_SIMD128
// TODO(picnixz): use py_cpuid_features (gh-125022) to improve detection
state->can_run_simd128 = sse && sse2 && sse3 && sse41 && sse42 && cmov;
#else
// fmt: off
(void)sse; (void)sse2; (void)sse3; (void)sse41; (void)sse42; (void)cmov;
// fmt: on
state->can_run_simd128 = false;
#endif
#if HACL_CAN_COMPILE_SIMD256
// TODO(picnixz): use py_cpuid_features (gh-125022) to improve detection
state->can_run_simd256 = state->can_run_simd128 && avx && avx2;
#else
// fmt: off
(void)avx; (void)avx2;
// fmt: on
state->can_run_simd256 = false;
#endif
}
static int
hmacmodule_exec(PyObject *module)
{
hmacmodule_state *state = get_hmacmodule_state(module);
if (hmacmodule_init_hash_info_table(state) < 0) {
return -1;
}
if (hmacmodule_init_exceptions(module, state) < 0) {
return -1;
}
if (hmacmodule_init_hmac_type(module, state) < 0) {
return -1;
}
if (hmacmodule_init_strings(state) < 0) {
return -1;
}
if (hmacmodule_init_globals(module, state) < 0) {
return -1;
}
hmacmodule_init_cpu_features(state);
return 0;
}
static int
hmacmodule_traverse(PyObject *mod, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(mod));
hmacmodule_state *state = get_hmacmodule_state(mod);
Py_VISIT(state->unknown_hash_error);
Py_VISIT(state->hmac_type);
Py_VISIT(state->str_lower);
return 0;
}
static int
hmacmodule_clear(PyObject *mod)
{
hmacmodule_state *state = get_hmacmodule_state(mod);
if (state->hinfo_table != NULL) {
_Py_hashtable_destroy(state->hinfo_table);
state->hinfo_table = NULL;
}
Py_CLEAR(state->unknown_hash_error);
Py_CLEAR(state->hmac_type);
Py_CLEAR(state->str_lower);
return 0;
}
static inline void
hmacmodule_free(void *mod)
{
(void)hmacmodule_clear((PyObject *)mod);
}
static struct PyModuleDef_Slot hmacmodule_slots[] = {
{Py_mod_exec, hmacmodule_exec},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{Py_mod_gil, Py_MOD_GIL_NOT_USED},
{0, NULL} /* sentinel */
};
static struct PyModuleDef _hmacmodule = {
PyModuleDef_HEAD_INIT,
.m_name = "_hmac",
.m_size = sizeof(hmacmodule_state),
.m_methods = hmacmodule_methods,
.m_slots = hmacmodule_slots,
.m_traverse = hmacmodule_traverse,
.m_clear = hmacmodule_clear,
.m_free = hmacmodule_free,
};
PyMODINIT_FUNC
PyInit__hmac(void)
{
return PyModuleDef_Init(&_hmacmodule);
}
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