Check for extended key usage by traversing raw extension data
This commit re-implements `mbedtls_x509_crt_check_extended_key_usage()`
to not use the dynamically allocated linked list presentation of the
`ExtendedKeyUsage` but to search for the required usage by traversing
the raw ASN.1 data.
diff --git a/include/mbedtls/asn1.h b/include/mbedtls/asn1.h
index 2fb6de0..b49fe5a 100644
--- a/include/mbedtls/asn1.h
+++ b/include/mbedtls/asn1.h
@@ -131,6 +131,10 @@
( ( MBEDTLS_OID_SIZE(oid_str) != (oid_buf)->len ) || \
memcmp( (oid_str), (oid_buf)->p, (oid_buf)->len) != 0 )
+#define MBEDTLS_OID_CMP_RAW(oid_str, oid_buf, oid_buf_len) \
+ ( ( MBEDTLS_OID_SIZE(oid_str) != (oid_buf_len) ) || \
+ memcmp( (oid_str), (oid_buf), (oid_buf_len) ) != 0 )
+
#ifdef __cplusplus
extern "C" {
#endif