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bignum_mod_raw: Updated documentation for mpi_mod_raw_mul

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Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2023-06-26 17:05:53 +01:00
parent 8eb6104256
commit 53a16b3fb5
1 changed files with 4 additions and 4 deletions
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8
library/bignum_mod_raw.c
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@ -132,13 +132,13 @@ void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
{
/* Standard (A * B) multiplication stored into pre-allocated T
* buffer of fixed limb size of (2N + 1).
*
* The space may not not fully filled by when
* MBEDTLS_MPI_MOD_REP_OPT_RED is used, with most
* curves using (2N) limbs.
* MBEDTLS_MPI_MOD_REP_OPT_RED is used, where we only need
* (2N) or (2N-1) limbs (depending on limb size and curve).
*
* The 521-bit Weierstrass curve is the only
* that which requires a limb size of (2N + 1). */
* that which requires a limb size of (2N). */
const size_t T_limbs = (N->bits == 521) ?
BITS_TO_LIMBS(N->bits * 2) + 1 :
BITS_TO_LIMBS(N->bits * 2);