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Convert over to using X, X_limbs

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Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2023-05-16 15:28:30 +01:00
parent 4fa8334bae
commit 34b08e5005
1 changed files with 9 additions and 9 deletions
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18
library/ecp_curves.c
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@ -5482,16 +5482,16 @@ cleanup:
* the reduction with 224-bit limbs, since mpi_add_mpi will then use 64-bit adds.
*/
MBEDTLS_STATIC_TESTABLE
int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *N, size_t N_limbs)
int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *X, size_t X_limbs)
{
size_t i;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (N_limbs <= P448_WIDTH) {
if (X_limbs <= P448_WIDTH) {
return 0;
}
size_t M_limbs = N_limbs - (P448_WIDTH);
size_t M_limbs = X_limbs - (P448_WIDTH);
size_t Q_limbs = M_limbs;
if (M_limbs > P448_WIDTH) {
@ -5513,15 +5513,15 @@ int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *N, size_t N_limbs)
/* Do not copy into the overflow limb, as this would read past the end of
* N. */
memcpy(M, N + P448_WIDTH, ((M_limbs - 1) * ciL));
memcpy(M, X + P448_WIDTH, ((M_limbs - 1) * ciL));
/* N = A0 */
for (i = P448_WIDTH; i < N_limbs; i++) {
N[i] = 0;
for (i = P448_WIDTH; i < X_limbs; i++) {
X[i] = 0;
}
/* N += A1 - Carry here dealt with by oversize M and N. */
(void) mbedtls_mpi_core_add(N, N, M, M_limbs);
(void) mbedtls_mpi_core_add(X, X, M, M_limbs);
/* Q = B1, N += B1 */
mbedtls_mpi_uint *Q = mbedtls_calloc(Q_limbs, ciL);
@ -5536,7 +5536,7 @@ int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *N, size_t N_limbs)
mbedtls_mpi_core_shift_r(Q, Q_limbs, 224);
/* No carry here - only max 224 bits */
(void) mbedtls_mpi_core_add(N, N, Q, Q_limbs);
(void) mbedtls_mpi_core_add(X, X, Q, Q_limbs);
/* M = (B0 + B1) * 2^224, N += M */
if (sizeof(mbedtls_mpi_uint) > 4) {
@ -5550,7 +5550,7 @@ int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *N, size_t N_limbs)
/* Shifted carry bit from the addition is dealt with by oversize M */
mbedtls_mpi_core_shift_l(M, M_limbs, 224);
(void) mbedtls_mpi_core_add(N, N, M, M_limbs);
(void) mbedtls_mpi_core_add(X, X, M, M_limbs);
ret = 0;