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psa: let mbedtls_ecc_group_from_psa() accept only exact bit lengths

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2023-12-29 11:46:44 +01:00
parent dc33200b74
commit 0e608807e3
3 changed files with 17 additions and 24 deletions
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9
include/mbedtls/psa_util.h
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@ -126,16 +126,11 @@ psa_ecc_family_t mbedtls_ecc_group_to_psa(mbedtls_ecp_group_id grpid,
* \param curve A PSA elliptic curve identifier
* (`PSA_ECC_FAMILY_xxx`).
* \param bits The bit-length of a private key on \p curve.
* \param bits_is_sloppy If true, \p bits may be the bit-length rounded up
* to the nearest multiple of 8. This allows the caller
* to infer the exact curve from the length of a key
* which is supplied as a byte string.
*
* \return The corresponding Mbed TLS elliptic curve identifier
* (`MBEDTLS_ECP_DP_xxx`).
* \return #MBEDTLS_ECP_DP_NONE if \c curve is not recognized.
* \return #MBEDTLS_ECP_DP_NONE if \p bits is not
* correct for \p curve.
* \return #MBEDTLS_ECP_DP_NONE if the combination of \c curve
* and \p bits is not recognized.
*/
mbedtls_ecp_group_id mbedtls_ecc_group_from_psa(psa_ecc_family_t curve,
size_t bits);