coffee/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2026-11-09 14:50:17 +08:00
Code Issues Packages Projects Releases Wiki Activity

ecp: avoid heap usage in mbedtls_ecp_mod_p255_raw()

Browse Source 
The buffer is only 32 bytes...

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2026-04-10 10:27:21 +02:00
parent 581f773c99
commit 37279c1f95
2 changed files with 1 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
library/ecp_curves.c
View File

@ -5426,10 +5426,7 @@ int mbedtls_ecp_mod_p255_raw(mbedtls_mpi_uint *X, size_t X_Limbs)
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
mbedtls_mpi_uint *carry = mbedtls_calloc(P255_WIDTH, ciL);
if (carry == NULL) {
return MBEDTLS_ERR_ECP_ALLOC_FAILED;
}
mbedtls_mpi_uint carry[P255_WIDTH] = { 0 };
/* Step 1: Reduction to P255_WIDTH limbs */
if (X_Limbs > P255_WIDTH) {
@ -5460,7 +5457,6 @@ int mbedtls_ecp_mod_p255_raw(mbedtls_mpi_uint *X, size_t X_Limbs)
* - If X > 2^255 ==> X < 2^256 - 2^255 < 2p */
(void) mbedtls_mpi_core_add(X, X, carry, P255_WIDTH);
mbedtls_free(carry);
return 0;
}
#endif /* MBEDTLS_ECP_DP_CURVE25519_ENABLED */

1
library/ecp_invasive.h
View File

@ -252,7 +252,6 @@ int mbedtls_ecp_mod_p256k1_raw(mbedtls_mpi_uint *X, size_t X_limbs);
* \return \c 0 on success.
* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if \p X does not have
* twice as many limbs as the modulus.
* \return #MBEDTLS_ERR_ECP_ALLOC_FAILED if memory allocation failed.
*/
MBEDTLS_STATIC_TESTABLE
int mbedtls_ecp_mod_p255_raw(mbedtls_mpi_uint *X, size_t X_limbs);