Add mbedtls_ssl_check_curve_tls_id() (internal)
This can be used to validate the server's choice of group in the PSA
case (this will be done in the next commit).
Backport of 0d63b84fa49ecb758dbec4fd7a94df59fe8367ab with a very
different implementation, as 2.28 still stores the list of allowed
groups with their mbedtls_ecp group IDs, not the IANA/TLS group IDs
(changed by https://github.com/ARMmbed/mbedtls/pull/4859/ in 3.x).
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index c7265f1..bd0eb10 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7326,6 +7326,18 @@
return( -1 );
}
+
+/*
+ * Same as mbedtls_ssl_check_curve() but takes a TLS ID for the curve.
+ */
+int mbedtls_ssl_check_curve_tls_id( const mbedtls_ssl_context *ssl, uint16_t tls_id )
+{
+ const mbedtls_ecp_curve_info *curve_info =
+ mbedtls_ecp_curve_info_from_tls_id( tls_id );
+ if( curve_info == NULL )
+ return( -1 );
+ return( mbedtls_ssl_check_curve( ssl, curve_info->grp_id ) );
+}
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)