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gh-133061: do not mention UINT32_MAX in HMAC user-facing messages by picnixz · Pull Request #133062 · python/cpython · GitHub

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gh-133061: do not mention UINT32_MAX in HMAC user-facing messages #133062

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Merged
picnixz merged 1 commit into from
Apr 27, 2025
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gh-133061: do not mention UINT32_MAX in HMAC user-facing messages #133062

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79 changes: 46 additions & 33 deletions Modules/hmacmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,21 @@

// --- Reusable error messages ------------------------------------------------

#define INVALID_KEY_LENGTH "key length exceeds UINT32_MAX"
#define INVALID_MSG_LENGTH "message length exceeds UINT32_MAX"
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 -----------------------

Expand Down Expand Up @@ -760,7 +773,7 @@ hmac_new_initial_state(HMACObject *self, uint8_t *key, Py_ssize_t len)
// 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) {
PyErr_SetString(PyExc_OverflowError, INVALID_KEY_LENGTH);
set_invalid_key_length_error();
return -1;
}
#endif
Expand Down Expand Up @@ -1249,36 +1262,36 @@ _hmac_compute_digest_impl(PyObject *module, PyObject *key, PyObject *msg,
* 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); \
PyErr_SetString(PyExc_OverflowError, INVALID_KEY_LENGTH); \
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); \
PyErr_SetString(PyExc_OverflowError, INVALID_MSG_LENGTH); \
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 \
); \
#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]
Expand Down
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