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Fix limb size calculation

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei 2023-03-01 16:11:11 +01:00
parent ed1acf642c
commit 716447ff32
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GPG Key ID: FEE76C0CF8C6267D
1 changed files with 2 additions and 2 deletions
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4
library/ecp_curves.c
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@ -5108,7 +5108,7 @@ int mbedtls_ecp_mod_p224_raw(mbedtls_mpi_uint *X, size_t X_limbs)
static int ecp_mod_p256(mbedtls_mpi *N) static int ecp_mod_p256(mbedtls_mpi *N)
{ {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t expected_width = 2 * ((256 + biL - 1) / biL); size_t expected_width = 2 * 256 / biL;
MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width)); MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width));
ret = mbedtls_ecp_mod_p256_raw(N->p, expected_width); ret = mbedtls_ecp_mod_p256_raw(N->p, expected_width);
cleanup: cleanup:
@ -5118,7 +5118,7 @@ cleanup:
MBEDTLS_STATIC_TESTABLE MBEDTLS_STATIC_TESTABLE
int mbedtls_ecp_mod_p256_raw(mbedtls_mpi_uint *X, size_t X_limbs) int mbedtls_ecp_mod_p256_raw(mbedtls_mpi_uint *X, size_t X_limbs)
{ {
if (X_limbs != 2*((256 + biL - 1)/biL)) { if (X_limbs != 2 * 256 / biL) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
} }