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mbedtls_psa_parse_tls_ecc_group: make no assumption on PSA encodings

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Don't assume that the PSA encoding of elliptic curves is identical to
the TLS encoding. This is currently true but about to change.

The new implementation only works when MBEDTLS_ECP_C is defined. This
is ok because the function is only used with MBEDTLS_ECP_C defined.
This commit is contained in:
Gilles Peskine 2019-12-12 17:56:46 +01:00
parent fc2459db13
commit d8197cb902
1 changed files with 9 additions and 3 deletions
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12
include/mbedtls/psa_util.h
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@ -350,13 +350,19 @@ static inline int mbedtls_psa_err_translate_pk( psa_status_t status )
/* This function transforms an ECC group identifier from
* https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8
* into a PSA ECC group identifier. */
#if defined(MBEDTLS_ECP_C)
static inline psa_ecc_curve_t mbedtls_psa_parse_tls_ecc_group(
uint16_t tls_ecc_grp_reg_id )
{
/* The PSA identifiers are currently aligned with those from
* the TLS Supported Groups registry, so no conversion is necessary. */
return( (psa_ecc_curve_t) tls_ecc_grp_reg_id );
size_t bits;
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_tls_id( tls_ecc_grp_reg_id );
if( curve_info == NULL )
return( 0 );
else
return( mbedtls_ecc_group_to_psa( curve_info->grp_id, &bits ) );
}
#endif /* MBEDTLS_ECP_C */
/* This function takes a buffer holding an EC public key
* exported through psa_export_public_key(), and converts