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Add docs for mbedtls_ecp_mod_p448()

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Signed-off-by: Paul Elliott <paul.elliott@arm.com>
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Paul Elliott 2023-05-31 12:12:22 +01:00
parent edc97680d5
commit ee86100963
1 changed files with 19 additions and 0 deletions
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19
library/ecp_invasive.h
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@ -243,6 +243,25 @@ int mbedtls_ecp_mod_p256k1_raw(mbedtls_mpi_uint *X, size_t X_limbs);
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
/** Fast quasi-reduction modulo p448 = 2^448 - 2^224 - 1
* Write X as A0 + 2^448 A1 and A1 as B0 + 2^224 B1, and return A0 + A1 + B1 +
* (B0 + B1) * 2^224.
*
* \param[in,out] X The address of the MPI to be converted.
* Must have exact limb size that stores a 896-bit MPI
* (double the bitlength of the modulus). Upon return
* holds the reduced value which is in range `0 <= X <
* N` (where N is the modulus). The bitlength of the
* reduced value is the same as that of the modulus
* (448 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_p448(mbedtls_mpi_uint *X, size_t X_limbs);