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cpython/Modules/blake2module.c
Bénédikt Tran 3cb109796d
gh-135004: rewrite and cleanup blake2module.c (#135006) 
* Cleanup imports and update module docstring.
* Simplify detection of SIMD support.
* Correctly guard `update()` cases.
* Rewrite `py_blake2b_or_s_new` and rename it to `py_blake2_new`.
* Rewrite `blake2_blake2b_copy_locked` and `py_blake2_clear`.
* Refactor computations of `digest` and `hexdigest`.
* Simplify `py_blake2b_get_name` and `py_blake2b_get_block_size`.
* Add `hacl_get_blake2_info` to extract static BLAKE-2 information.
   This new helper is used by `py_blake2b_get_digest_size`, but can
   be later used to expose `key_length` more easily.
2025-06-09 09:17:43 +02:00

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/*
* Written in 2013 by Dmitry Chestnykh <dmitry@codingrobots.com>
* Modified for CPython by Christian Heimes <christian@python.org>
* Updated to use HACL* by Jonathan Protzenko <jonathan@protzenko.fr>
*
* To the extent possible under law, the author have dedicated all
* copyright and related and neighboring rights to this software to
* the public domain worldwide. This software is distributed without
* any warranty. http://creativecommons.org/publicdomain/zero/1.0/
*/
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "hashlib.h"
#include "pycore_strhex.h" // _Py_strhex()
#include "pycore_typeobject.h"
#include "pycore_moduleobject.h"
// QUICK CPU AUTODETECTION
//
// See https://github.com/python/cpython/pull/119316 -- we only enable
// vectorized versions for Intel CPUs, even though HACL*'s "vec128" modules also
// run on ARM NEON. (We could enable them on POWER -- but I don't have access to
// a test machine to see if that speeds anything up.)
//
// Note that configure.ac and the rest of the build are written in such a way
// that if the configure script finds suitable flags to compile HACL's SIMD128
// (resp. SIMD256) files, then Hacl_Hash_Blake2b_Simd128.c (resp. ...) will be
// pulled into the build automatically, and then only the CPU autodetection will
// need to be updated here.
#if defined(__x86_64__) && defined(__GNUC__)
#include <cpuid.h>
#elif defined(_M_X64)
#include <intrin.h>
#endif
#include <stdbool.h>
// SIMD256 can't be compiled on macOS ARM64, and performance of SIMD128 isn't
// great; but when compiling a universal2 binary, autoconf will set
// HACL_CAN_COMPILE_SIMD128 and HACL_CAN_COMPILE_SIMD256 because they *can* be
// compiled on x86_64. If we're on macOS ARM64, disable these preprocessor
// symbols.
#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_Hash_Blake2s.h"
#include "_hacl/Hacl_Hash_Blake2b.h"
#if HACL_CAN_COMPILE_SIMD128
#include "_hacl/Hacl_Hash_Blake2s_Simd128.h"
#endif
#if HACL_CAN_COMPILE_SIMD256
#include "_hacl/Hacl_Hash_Blake2b_Simd256.h"
#endif
// MODULE TYPE SLOTS
static PyType_Spec blake2b_type_spec;
static PyType_Spec blake2s_type_spec;
PyDoc_STRVAR(blake2mod__doc__,
"_blake2 provides BLAKE2b and BLAKE2s for hashlib\n");
typedef struct {
PyTypeObject *blake2b_type;
PyTypeObject *blake2s_type;
bool can_run_simd128;
bool can_run_simd256;
} Blake2State;
static inline Blake2State *
blake2_get_state(PyObject *module)
{
void *state = _PyModule_GetState(module);
assert(state != NULL);
return (Blake2State *)state;
}
#if defined(HACL_CAN_COMPILE_SIMD128) || defined(HACL_CAN_COMPILE_SIMD256)
static inline Blake2State *
blake2_get_state_from_type(PyTypeObject *module)
{
void *state = _PyType_GetModuleState(module);
assert(state != NULL);
return (Blake2State *)state;
}
#endif
static struct PyMethodDef blake2mod_functions[] = {
{NULL, NULL}
};
static int
_blake2_traverse(PyObject *module, visitproc visit, void *arg)
{
Blake2State *state = blake2_get_state(module);
Py_VISIT(state->blake2b_type);
Py_VISIT(state->blake2s_type);
return 0;
}
static int
_blake2_clear(PyObject *module)
{
Blake2State *state = blake2_get_state(module);
Py_CLEAR(state->blake2b_type);
Py_CLEAR(state->blake2s_type);
return 0;
}
static void
_blake2_free(void *module)
{
(void)_blake2_clear((PyObject *)module);
}
static void
blake2module_init_cpu_features(Blake2State *state)
{
/* This must be kept in sync with hmacmodule_init_cpu_features()
* in hmacmodule.c */
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
blake2_exec(PyObject *m)
{
Blake2State *st = blake2_get_state(m);
blake2module_init_cpu_features(st);
#define ADD_INT(DICT, NAME, VALUE) \
do { \
PyObject *x = PyLong_FromLong(VALUE); \
if (x == NULL) { \
return -1; \
} \
int rc = PyDict_SetItemString(DICT, NAME, x); \
Py_DECREF(x); \
if (rc < 0) { \
return -1; \
} \
} while(0)
#define ADD_INT_CONST(NAME, VALUE) \
do { \
if (PyModule_AddIntConstant(m, NAME, VALUE) < 0) { \
return -1; \
} \
} while (0)
ADD_INT_CONST("_GIL_MINSIZE", HASHLIB_GIL_MINSIZE);
st->blake2b_type = (PyTypeObject *)PyType_FromModuleAndSpec(
m, &blake2b_type_spec, NULL);
if (st->blake2b_type == NULL) {
return -1;
}
if (PyModule_AddType(m, st->blake2b_type) < 0) {
return -1;
}
PyObject *d = st->blake2b_type->tp_dict;
ADD_INT(d, "SALT_SIZE", HACL_HASH_BLAKE2B_SALT_BYTES);
ADD_INT(d, "PERSON_SIZE", HACL_HASH_BLAKE2B_PERSONAL_BYTES);
ADD_INT(d, "MAX_KEY_SIZE", HACL_HASH_BLAKE2B_KEY_BYTES);
ADD_INT(d, "MAX_DIGEST_SIZE", HACL_HASH_BLAKE2B_OUT_BYTES);
ADD_INT_CONST("BLAKE2B_SALT_SIZE", HACL_HASH_BLAKE2B_SALT_BYTES);
ADD_INT_CONST("BLAKE2B_PERSON_SIZE", HACL_HASH_BLAKE2B_PERSONAL_BYTES);
ADD_INT_CONST("BLAKE2B_MAX_KEY_SIZE", HACL_HASH_BLAKE2B_KEY_BYTES);
ADD_INT_CONST("BLAKE2B_MAX_DIGEST_SIZE", HACL_HASH_BLAKE2B_OUT_BYTES);
/* BLAKE2s */
st->blake2s_type = (PyTypeObject *)PyType_FromModuleAndSpec(
m, &blake2s_type_spec, NULL);
if (st->blake2s_type == NULL) {
return -1;
}
if (PyModule_AddType(m, st->blake2s_type) < 0) {
return -1;
}
d = st->blake2s_type->tp_dict;
ADD_INT(d, "SALT_SIZE", HACL_HASH_BLAKE2S_SALT_BYTES);
ADD_INT(d, "PERSON_SIZE", HACL_HASH_BLAKE2S_PERSONAL_BYTES);
ADD_INT(d, "MAX_KEY_SIZE", HACL_HASH_BLAKE2S_KEY_BYTES);
ADD_INT(d, "MAX_DIGEST_SIZE", HACL_HASH_BLAKE2S_OUT_BYTES);
ADD_INT_CONST("BLAKE2S_SALT_SIZE", HACL_HASH_BLAKE2S_SALT_BYTES);
ADD_INT_CONST("BLAKE2S_PERSON_SIZE", HACL_HASH_BLAKE2S_PERSONAL_BYTES);
ADD_INT_CONST("BLAKE2S_MAX_KEY_SIZE", HACL_HASH_BLAKE2S_KEY_BYTES);
ADD_INT_CONST("BLAKE2S_MAX_DIGEST_SIZE", HACL_HASH_BLAKE2S_OUT_BYTES);
#undef ADD_INT_CONST
#undef ADD_INT
return 0;
}
static PyModuleDef_Slot _blake2_slots[] = {
{Py_mod_exec, blake2_exec},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{Py_mod_gil, Py_MOD_GIL_NOT_USED},
{0, NULL}
};
static struct PyModuleDef blake2_module = {
.m_base = PyModuleDef_HEAD_INIT,
.m_name = "_blake2",
.m_doc = blake2mod__doc__,
.m_size = sizeof(Blake2State),
.m_methods = blake2mod_functions,
.m_slots = _blake2_slots,
.m_traverse = _blake2_traverse,
.m_clear = _blake2_clear,
.m_free = _blake2_free,
};
PyMODINIT_FUNC
PyInit__blake2(void)
{
return PyModuleDef_Init(&blake2_module);
}
// IMPLEMENTATION OF METHODS
// The HACL* API does not offer an agile API that can deal with either Blake2S
// or Blake2B -- the reason is that the underlying states are optimized (uint32s
// for S, uint64s for B). Therefore, we use a tagged union in this module to
// correctly dispatch. Note that the previous incarnation of this code
// transformed the Blake2b implementation into the Blake2s one using a script,
// so this is an improvement.
//
// The 128 and 256 versions are only available if i) we were able to compile
// them, and ii) if the CPU we run on also happens to have the right instruction
// set.
typedef enum { Blake2s, Blake2b, Blake2s_128, Blake2b_256 } blake2_impl;
static inline bool
is_blake2b(blake2_impl impl)
{
return impl == Blake2b || impl == Blake2b_256;
}
static inline bool
is_blake2s(blake2_impl impl)
{
return impl == Blake2s || impl == Blake2s_128;
}
static inline blake2_impl
type_to_impl(PyTypeObject *type)
{
#if defined(HACL_CAN_COMPILE_SIMD128) || defined(HACL_CAN_COMPILE_SIMD256)
Blake2State *st = blake2_get_state_from_type(type);
#endif
if (!strcmp(type->tp_name, blake2b_type_spec.name)) {
#if HACL_CAN_COMPILE_SIMD256
return st->can_run_simd256 ? Blake2b_256 : Blake2b;
#else
return Blake2b;
#endif
}
else if (!strcmp(type->tp_name, blake2s_type_spec.name)) {
#if HACL_CAN_COMPILE_SIMD128
return st->can_run_simd128 ? Blake2s_128 : Blake2s;
#else
return Blake2s;
#endif
}
Py_UNREACHABLE();
}
typedef struct {
PyObject_HEAD
union {
Hacl_Hash_Blake2s_state_t *blake2s_state;
Hacl_Hash_Blake2b_state_t *blake2b_state;
#if HACL_CAN_COMPILE_SIMD128
Hacl_Hash_Blake2s_Simd128_state_t *blake2s_128_state;
#endif
#if HACL_CAN_COMPILE_SIMD256
Hacl_Hash_Blake2b_Simd256_state_t *blake2b_256_state;
#endif
};
blake2_impl impl;
bool use_mutex;
PyMutex mutex;
} Blake2Object;
#define _Blake2Object_CAST(op) ((Blake2Object *)(op))
#include "clinic/blake2module.c.h"
/*[clinic input]
module _blake2
class _blake2.blake2b "Blake2Object *" "&PyBlake2_BLAKE2bType"
class _blake2.blake2s "Blake2Object *" "&PyBlake2_BLAKE2sType"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b7526666bd18af83]*/
static Blake2Object *
new_Blake2Object(PyTypeObject *type)
{
Blake2Object *self = PyObject_GC_New(Blake2Object, type);
if (self == NULL) {
return NULL;
}
HASHLIB_INIT_MUTEX(self);
PyObject_GC_Track(self);
return self;
}
/* HACL* takes a uint32_t for the length of its parameter, but Py_ssize_t can be
* 64 bits so we loop in <4gig chunks when needed. */
#if PY_SSIZE_T_MAX > UINT32_MAX
# define HACL_UPDATE_LOOP(UPDATE_FUNC, STATE, BUF, LEN) \
do { \
while (LEN > UINT32_MAX) { \
(void)UPDATE_FUNC(STATE, BUF, UINT32_MAX); \
LEN -= UINT32_MAX; \
BUF += UINT32_MAX; \
} \
} while (0)
#else
# define HACL_UPDATE_LOOP(...)
#endif
/*
* Note: we explicitly ignore the error code on the basis that it would take
* more than 1 billion years to overflow the maximum admissible length for
* blake2b/2s (2^64 - 1).
*/
#define HACL_UPDATE(UPDATE_FUNC, STATE, BUF, LEN) \
do { \
HACL_UPDATE_LOOP(UPDATE_FUNC, STATE, BUF, LEN); \
/* cast to uint32_t is now safe */ \
(void)UPDATE_FUNC(STATE, BUF, (uint32_t)LEN); \
} while (0)
static void
update(Blake2Object *self, uint8_t *buf, Py_ssize_t len)
{
switch (self->impl) {
// blake2b_256_state and blake2s_128_state must be if'd since
// otherwise this results in an unresolved symbol at link-time.
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
HACL_UPDATE(Hacl_Hash_Blake2b_Simd256_update,
self->blake2b_256_state, buf, len);
return;
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
HACL_UPDATE(Hacl_Hash_Blake2s_Simd128_update,
self->blake2s_128_state, buf, len);
return;
#endif
case Blake2b:
HACL_UPDATE(Hacl_Hash_Blake2b_update,
self->blake2b_state, buf, len);
return;
case Blake2s:
HACL_UPDATE(Hacl_Hash_Blake2s_update,
self->blake2s_state, buf, len);
return;
default:
Py_UNREACHABLE();
}
}
#define BLAKE2_IMPLNAME(SELF) \
(is_blake2b((SELF)->impl) ? "blake2b" : "blake2s")
#define GET_BLAKE2_CONST(SELF, NAME) \
(is_blake2b((SELF)->impl) \
? HACL_HASH_BLAKE2B_ ## NAME \
: HACL_HASH_BLAKE2S_ ## NAME)
#define MAX_OUT_BYTES(SELF) GET_BLAKE2_CONST(SELF, OUT_BYTES)
#define MAX_SALT_LENGTH(SELF) GET_BLAKE2_CONST(SELF, SALT_BYTES)
#define MAX_KEY_BYTES(SELF) GET_BLAKE2_CONST(SELF, KEY_BYTES)
#define MAX_PERSONAL_BYTES(SELF) GET_BLAKE2_CONST(SELF, PERSONAL_BYTES)
static int
py_blake2_validate_params(Blake2Object *self,
int digest_size,
Py_buffer *key, Py_buffer *salt, Py_buffer *person,
int fanout, int depth, unsigned long leaf_size,
unsigned long long node_offset, int node_depth,
int inner_size)
{
/* Validate digest size. */
if (digest_size <= 0 || (unsigned int)digest_size > MAX_OUT_BYTES(self)) {
PyErr_Format(
PyExc_ValueError,
"digest_size for %s must be between 1 and %d bytes, got %d",
BLAKE2_IMPLNAME(self), MAX_OUT_BYTES(self), digest_size
);
goto error;
}
#define CHECK_LENGTH(NAME, VALUE, MAX) \
do { \
if ((size_t)(VALUE) > (size_t)(MAX)) { \
PyErr_Format(PyExc_ValueError, \
"maximum %s length is %zu bytes, got %zd", \
(NAME), (size_t)(MAX), (Py_ssize_t)(VALUE)); \
goto error; \
} \
} while (0)
/* Validate key parameter. */
if (key->obj && key->len) {
CHECK_LENGTH("key", key->len, MAX_KEY_BYTES(self));
}
/* Validate salt parameter. */
if (salt->obj && salt->len) {
CHECK_LENGTH("salt", salt->len, MAX_SALT_LENGTH(self));
}
/* Validate personalization parameter. */
if (person->obj && person->len) {
CHECK_LENGTH("person", person->len, MAX_PERSONAL_BYTES(self));
}
#undef CHECK_LENGTH
#define CHECK_TREE(NAME, VALUE, MIN, MAX) \
do { \
if ((VALUE) < (MIN) || (size_t)(VALUE) > (size_t)(MAX)) { \
PyErr_Format(PyExc_ValueError, \
"'%s' must be between %zu and %zu", \
(NAME), (size_t)(MIN), (size_t)(MAX)); \
goto error; \
} \
} while (0)
/* Validate tree parameters. */
CHECK_TREE("fanout", fanout, 0, 255);
CHECK_TREE("depth", depth, 1, 255);
CHECK_TREE("node_depth", node_depth, 0, 255);
CHECK_TREE("inner_size", inner_size, 0, MAX_OUT_BYTES(self));
#undef CHECK_TREE
if (leaf_size > 0xFFFFFFFFU) {
/* maximum: 2**32 - 1 */
PyErr_SetString(PyExc_OverflowError, "'leaf_size' is too large");
goto error;
}
if (is_blake2s(self->impl) && node_offset > 0xFFFFFFFFFFFFULL) {
/* maximum: 2**48 - 1 */
PyErr_SetString(PyExc_OverflowError, "'node_offset' is too large");
goto error;
}
return 0;
error:
return -1;
}
static PyObject *
py_blake2_new(PyTypeObject *type, PyObject *data, int digest_size,
Py_buffer *key, Py_buffer *salt, Py_buffer *person,
int fanout, int depth, unsigned long leaf_size,
unsigned long long node_offset, int node_depth,
int inner_size, int last_node, int usedforsecurity)
{
Blake2Object *self = NULL;
self = new_Blake2Object(type);
if (self == NULL) {
goto error;
}
self->impl = type_to_impl(type);
// Ensure that the states are NULL-initialized in case of an error.
// See: py_blake2_clear() for more details.
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
self->blake2b_256_state = NULL;
break;
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
self->blake2s_128_state = NULL;
break;
#endif
case Blake2b:
self->blake2b_state = NULL;
break;
case Blake2s:
self->blake2s_state = NULL;
break;
default:
Py_UNREACHABLE();
}
// Unlike the state types, the parameters share a single (client-friendly)
// structure.
if (py_blake2_validate_params(self,
digest_size,
key, salt, person,
fanout, depth, leaf_size,
node_offset, node_depth, inner_size) < 0)
{
goto error;
}
// Using Blake2b because we statically know that these are greater than the
// Blake2s sizes -- this avoids a VLA.
uint8_t salt_buffer[HACL_HASH_BLAKE2B_SALT_BYTES] = {0};
uint8_t personal_buffer[HACL_HASH_BLAKE2B_PERSONAL_BYTES] = {0};
if (salt->obj != NULL) {
assert(salt->buf != NULL);
memcpy(salt_buffer, salt->buf, salt->len);
}
if (person->obj != NULL) {
assert(person->buf != NULL);
memcpy(personal_buffer, person->buf, person->len);
}
Hacl_Hash_Blake2b_blake2_params params = {
.digest_length = digest_size,
.key_length = (uint8_t)key->len,
.fanout = fanout,
.depth = depth,
.leaf_length = leaf_size,
.node_offset = node_offset,
.node_depth = node_depth,
.inner_length = inner_size,
.salt = salt_buffer,
.personal = personal_buffer
};
#define BLAKE2_MALLOC(TYPE, STATE) \
do { \
STATE = Hacl_Hash_ ## TYPE ## _malloc_with_params_and_key( \
&params, last_node, key->buf); \
if (STATE == NULL) { \
(void)PyErr_NoMemory(); \
goto error; \
} \
} while (0)
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
BLAKE2_MALLOC(Blake2b_Simd256, self->blake2b_256_state);
break;
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
BLAKE2_MALLOC(Blake2s_Simd128, self->blake2s_128_state);
break;
#endif
case Blake2b:
BLAKE2_MALLOC(Blake2b, self->blake2b_state);
break;
case Blake2s:
BLAKE2_MALLOC(Blake2s, self->blake2s_state);
break;
default:
Py_UNREACHABLE();
}
#undef BLAKE2_MALLOC
/* Process initial data if any. */
if (data != NULL) {
Py_buffer buf;
GET_BUFFER_VIEW_OR_ERROR(data, &buf, goto error);
if (buf.len >= HASHLIB_GIL_MINSIZE) {
Py_BEGIN_ALLOW_THREADS
update(self, buf.buf, buf.len);
Py_END_ALLOW_THREADS
}
else {
update(self, buf.buf, buf.len);
}
PyBuffer_Release(&buf);
}
return (PyObject *)self;
error:
Py_XDECREF(self);
return NULL;
}
/*[clinic input]
@classmethod
_blake2.blake2b.__new__ as py_blake2b_new
data as data_obj: object(c_default="NULL") = b''
*
digest_size: int(c_default="HACL_HASH_BLAKE2B_OUT_BYTES") = _blake2.blake2b.MAX_DIGEST_SIZE
key: Py_buffer(c_default="NULL", py_default="b''") = None
salt: Py_buffer(c_default="NULL", py_default="b''") = None
person: Py_buffer(c_default="NULL", py_default="b''") = None
fanout: int = 1
depth: int = 1
leaf_size: unsigned_long = 0
node_offset: unsigned_long_long = 0
node_depth: int = 0
inner_size: int = 0
last_node: bool = False
usedforsecurity: bool = True
string: object(c_default="NULL") = None
Return a new BLAKE2b hash object.
[clinic start generated code]*/
static PyObject *
py_blake2b_new_impl(PyTypeObject *type, PyObject *data_obj, int digest_size,
Py_buffer *key, Py_buffer *salt, Py_buffer *person,
int fanout, int depth, unsigned long leaf_size,
unsigned long long node_offset, int node_depth,
int inner_size, int last_node, int usedforsecurity,
PyObject *string)
/*[clinic end generated code: output=de64bd850606b6a0 input=78cf60a2922d2f90]*/
{
PyObject *data;
if (_Py_hashlib_data_argument(&data, data_obj, string) < 0) {
return NULL;
}
return py_blake2_new(type, data, digest_size, key, salt, person,
fanout, depth, leaf_size, node_offset, node_depth,
inner_size, last_node, usedforsecurity);
}
/*[clinic input]
@classmethod
_blake2.blake2s.__new__ as py_blake2s_new
data as data_obj: object(c_default="NULL") = b''
*
digest_size: int(c_default="HACL_HASH_BLAKE2S_OUT_BYTES") = _blake2.blake2s.MAX_DIGEST_SIZE
key: Py_buffer(c_default="NULL", py_default="b''") = None
salt: Py_buffer(c_default="NULL", py_default="b''") = None
person: Py_buffer(c_default="NULL", py_default="b''") = None
fanout: int = 1
depth: int = 1
leaf_size: unsigned_long = 0
node_offset: unsigned_long_long = 0
node_depth: int = 0
inner_size: int = 0
last_node: bool = False
usedforsecurity: bool = True
string: object(c_default="NULL") = None
Return a new BLAKE2s hash object.
[clinic start generated code]*/
static PyObject *
py_blake2s_new_impl(PyTypeObject *type, PyObject *data_obj, int digest_size,
Py_buffer *key, Py_buffer *salt, Py_buffer *person,
int fanout, int depth, unsigned long leaf_size,
unsigned long long node_offset, int node_depth,
int inner_size, int last_node, int usedforsecurity,
PyObject *string)
/*[clinic end generated code: output=582a0c4295cc3a3c input=6843d6332eefd295]*/
{
PyObject *data;
if (_Py_hashlib_data_argument(&data, data_obj, string) < 0) {
return NULL;
}
return py_blake2_new(type, data, digest_size, key, salt, person,
fanout, depth, leaf_size, node_offset, node_depth,
inner_size, last_node, usedforsecurity);
}
static int
blake2_blake2b_copy_locked(Blake2Object *self, Blake2Object *cpy)
{
assert(cpy != NULL);
#define BLAKE2_COPY(TYPE, STATE_ATTR) \
do { \
cpy->STATE_ATTR = Hacl_Hash_ ## TYPE ## _copy(self->STATE_ATTR); \
if (cpy->STATE_ATTR == NULL) { \
goto error; \
} \
} while (0)
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
BLAKE2_COPY(Blake2b_Simd256, blake2b_256_state);
break;
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
BLAKE2_COPY(Blake2s_Simd128, blake2s_128_state);
break;
#endif
case Blake2b:
BLAKE2_COPY(Blake2b, blake2b_state);
break;
case Blake2s:
BLAKE2_COPY(Blake2s, blake2s_state);
break;
default:
Py_UNREACHABLE();
}
#undef BLAKE2_COPY
cpy->impl = self->impl;
return 0;
error:
(void)PyErr_NoMemory();
return -1;
}
/*[clinic input]
_blake2.blake2b.copy
Return a copy of the hash object.
[clinic start generated code]*/
static PyObject *
_blake2_blake2b_copy_impl(Blake2Object *self)
/*[clinic end generated code: output=622d1c56b91c50d8 input=e383c2d199fd8a2e]*/
{
int rc;
Blake2Object *cpy;
if ((cpy = new_Blake2Object(Py_TYPE(self))) == NULL) {
return NULL;
}
ENTER_HASHLIB(self);
rc = blake2_blake2b_copy_locked(self, cpy);
LEAVE_HASHLIB(self);
if (rc < 0) {
Py_DECREF(cpy);
return NULL;
}
return (PyObject *)cpy;
}
/*[clinic input]
_blake2.blake2b.update
data: object
/
Update this hash object's state with the provided bytes-like object.
[clinic start generated code]*/
static PyObject *
_blake2_blake2b_update_impl(Blake2Object *self, PyObject *data)
/*[clinic end generated code: output=99330230068e8c99 input=ffc4aa6a6a225d31]*/
{
Py_buffer buf;
GET_BUFFER_VIEW_OR_ERROUT(data, &buf);
if (!self->use_mutex && buf.len >= HASHLIB_GIL_MINSIZE) {
self->use_mutex = true;
}
if (self->use_mutex) {
Py_BEGIN_ALLOW_THREADS
PyMutex_Lock(&self->mutex);
update(self, buf.buf, buf.len);
PyMutex_Unlock(&self->mutex);
Py_END_ALLOW_THREADS
}
else {
update(self, buf.buf, buf.len);
}
PyBuffer_Release(&buf);
Py_RETURN_NONE;
}
static uint8_t
blake2_blake2b_compute_digest(Blake2Object *self, uint8_t *digest)
{
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
return Hacl_Hash_Blake2b_Simd256_digest(
self->blake2b_256_state, digest);
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
return Hacl_Hash_Blake2s_Simd128_digest(
self->blake2s_128_state, digest);
#endif
case Blake2b:
return Hacl_Hash_Blake2b_digest(self->blake2b_state, digest);
case Blake2s:
return Hacl_Hash_Blake2s_digest(self->blake2s_state, digest);
default:
Py_UNREACHABLE();
}
}
/*[clinic input]
_blake2.blake2b.digest
Return the digest value as a bytes object.
[clinic start generated code]*/
static PyObject *
_blake2_blake2b_digest_impl(Blake2Object *self)
/*[clinic end generated code: output=31ab8ad477f4a2f7 input=7d21659e9c5fff02]*/
{
uint8_t digest_length = 0, digest[HACL_HASH_BLAKE2B_OUT_BYTES];
ENTER_HASHLIB(self);
digest_length = blake2_blake2b_compute_digest(self, digest);
LEAVE_HASHLIB(self);
return PyBytes_FromStringAndSize((const char *)digest, digest_length);
}
/*[clinic input]
_blake2.blake2b.hexdigest
Return the digest value as a string of hexadecimal digits.
[clinic start generated code]*/
static PyObject *
_blake2_blake2b_hexdigest_impl(Blake2Object *self)
/*[clinic end generated code: output=5ef54b138db6610a input=76930f6946351f56]*/
{
uint8_t digest_length = 0, digest[HACL_HASH_BLAKE2B_OUT_BYTES];
ENTER_HASHLIB(self);
digest_length = blake2_blake2b_compute_digest(self, digest);
LEAVE_HASHLIB(self);
return _Py_strhex((const char *)digest, digest_length);
}
static PyMethodDef py_blake2b_methods[] = {
_BLAKE2_BLAKE2B_COPY_METHODDEF
_BLAKE2_BLAKE2B_DIGEST_METHODDEF
_BLAKE2_BLAKE2B_HEXDIGEST_METHODDEF
_BLAKE2_BLAKE2B_UPDATE_METHODDEF
{NULL, NULL}
};
static PyObject *
py_blake2b_get_name(PyObject *op, void *Py_UNUSED(closure))
{
Blake2Object *self = _Blake2Object_CAST(op);
return PyUnicode_FromString(BLAKE2_IMPLNAME(self));
}
static PyObject *
py_blake2b_get_block_size(PyObject *op, void *Py_UNUSED(closure))
{
Blake2Object *self = _Blake2Object_CAST(op);
return PyLong_FromLong(GET_BLAKE2_CONST(self, BLOCK_BYTES));
}
static Hacl_Hash_Blake2b_index
hacl_get_blake2_info(Blake2Object *self)
{
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
return Hacl_Hash_Blake2b_Simd256_info(self->blake2b_256_state);
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
return Hacl_Hash_Blake2s_Simd128_info(self->blake2s_128_state);
#endif
case Blake2b:
return Hacl_Hash_Blake2b_info(self->blake2b_state);
case Blake2s:
return Hacl_Hash_Blake2s_info(self->blake2s_state);
default:
Py_UNREACHABLE();
}
}
static PyObject *
py_blake2b_get_digest_size(PyObject *op, void *Py_UNUSED(closure))
{
Blake2Object *self = _Blake2Object_CAST(op);
Hacl_Hash_Blake2b_index info = hacl_get_blake2_info(self);
return PyLong_FromLong(info.digest_length);
}
static PyGetSetDef py_blake2b_getsetters[] = {
{"name", py_blake2b_get_name, NULL, NULL, NULL},
{"block_size", py_blake2b_get_block_size, NULL, NULL, NULL},
{"digest_size", py_blake2b_get_digest_size, NULL, NULL, NULL},
{NULL} /* Sentinel */
};
static int
py_blake2_clear(PyObject *op)
{
Blake2Object *self = (Blake2Object *)op;
// The initialization function uses PyObject_GC_New() but explicitly
// initializes the HACL* internal state to NULL before allocating
// it. If an error occurs in the constructor, we should only free
// states that were allocated (i.e. that are not NULL).
#define BLAKE2_FREE(TYPE, STATE) \
do { \
if (STATE != NULL) { \
Hacl_Hash_ ## TYPE ## _free(STATE); \
STATE = NULL; \
} \
} while (0)
switch (self->impl) {
#if HACL_CAN_COMPILE_SIMD256
case Blake2b_256:
BLAKE2_FREE(Blake2b_Simd256, self->blake2b_256_state);
break;
#endif
#if HACL_CAN_COMPILE_SIMD128
case Blake2s_128:
BLAKE2_FREE(Blake2s_Simd128, self->blake2s_128_state);
break;
#endif
case Blake2b:
BLAKE2_FREE(Blake2b, self->blake2b_state);
break;
case Blake2s:
BLAKE2_FREE(Blake2s, self->blake2s_state);
break;
default:
Py_UNREACHABLE();
}
#undef BLAKE2_FREE
return 0;
}
static void
py_blake2_dealloc(PyObject *self)
{
PyTypeObject *type = Py_TYPE(self);
PyObject_GC_UnTrack(self);
(void)py_blake2_clear(self);
type->tp_free(self);
Py_DECREF(type);
}
static int
py_blake2_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
}
static PyType_Slot blake2b_type_slots[] = {
{Py_tp_clear, py_blake2_clear},
{Py_tp_dealloc, py_blake2_dealloc},
{Py_tp_traverse, py_blake2_traverse},
{Py_tp_doc, (char *)py_blake2b_new__doc__},
{Py_tp_methods, py_blake2b_methods},
{Py_tp_getset, py_blake2b_getsetters},
{Py_tp_new, py_blake2b_new},
{0, 0}
};
static PyType_Slot blake2s_type_slots[] = {
{Py_tp_clear, py_blake2_clear},
{Py_tp_dealloc, py_blake2_dealloc},
{Py_tp_traverse, py_blake2_traverse},
{Py_tp_doc, (char *)py_blake2s_new__doc__},
{Py_tp_methods, py_blake2b_methods},
{Py_tp_getset, py_blake2b_getsetters},
// only the constructor differs, so that it can receive a clinic-generated
// default digest length suitable for blake2s
{Py_tp_new, py_blake2s_new},
{0, 0}
};
static PyType_Spec blake2b_type_spec = {
.name = "_blake2.blake2b",
.basicsize = sizeof(Blake2Object),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HEAPTYPE,
.slots = blake2b_type_slots
};
static PyType_Spec blake2s_type_spec = {
.name = "_blake2.blake2s",
.basicsize = sizeof(Blake2Object),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HEAPTYPE,
.slots = blake2s_type_slots
};
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