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ecp_curves: Added documentation for mbedtls_ecp_mod_p255_raw

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Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2023-05-18 16:16:17 +01:00
parent 31f0b452c7
commit 47249fd9ec
2 changed files with 17 additions and 1 deletions
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2
library/ecp_curves.c
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@ -5435,7 +5435,7 @@ int mbedtls_ecp_mod_p255_raw(mbedtls_mpi_uint *X, size_t X_Limbs)
if (X_Limbs > 2*P255_WIDTH) {
X_Limbs = 2*P255_WIDTH;
} else if (X_Limbs < P255_WIDTH) {
return 0;
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
mbedtls_mpi_uint *carry = mbedtls_calloc(P255_WIDTH, ciL);

16
library/ecp_invasive.h
View file

@ -243,6 +243,22 @@ int mbedtls_ecp_mod_p256k1_raw(mbedtls_mpi_uint *X, size_t X_limbs);
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
/** Fast quasi-reduction modulo p255 = 2^255 - 19
*
* \param[in,out] X The address of the MPI to be converted.
* Must have exact limb size that stores a 510-bit MPI
* (double the bitlength of the modulus).
* Upon return holds the reduced value which is
* in range `0 <= X < 2 * N` (where N is the modulus).
* The bitlength of the reduced value is the same as
* that of the modulus (255 bits).
* \param[in] X_limbs The length of \p X in 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);