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Clarify use of temporary in mbedtls_mpi_mod_raw_inv_prime()

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2022-12-09 10:58:15 +00:00
parent 6129268fee
commit 5f09930017
1 changed files with 3 additions and 0 deletions
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3
library/bignum_mod_raw.c
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@ -144,9 +144,12 @@ void mbedtls_mpi_mod_raw_inv_prime( mbedtls_mpi_uint *X,
* |G| = N - 1, so we want * |G| = N - 1, so we want
* g^(|G|-1) = g^(N - 2) * g^(|G|-1) = g^(N - 2)
*/ */
/* Use the first AN_limbs of T to hold N - 2 */
mbedtls_mpi_uint *Nminus2 = T; mbedtls_mpi_uint *Nminus2 = T;
(void) mbedtls_mpi_core_sub_int( Nminus2, N, 2, AN_limbs ); (void) mbedtls_mpi_core_sub_int( Nminus2, N, 2, AN_limbs );
/* Rest of T is given to exp_mod for its working space */
mbedtls_mpi_core_exp_mod( X, mbedtls_mpi_core_exp_mod( X,
A, N, AN_limbs, Nminus2, AN_limbs, A, N, AN_limbs, Nminus2, AN_limbs,
RR, T + AN_limbs ); RR, T + AN_limbs );