tree d1216c10a9b257048326593018f44a4909ce2ca8
parent 823efad6e85ccb2edd40a4f331783e3785815095
author Hanno Becker <hanno.becker@arm.com> 1551207049 +0000
committer Hanno Becker <hanno.becker@arm.com> 1561449986 +0100

Add public API to query subject and issuer from CRT

The legacy `mbedtls_x509_crt` contains fields `issuer/subject`
which are dynamically allocated linked list presentations of the
CRTs issuer and subject names, respectively.

The new CRT frame structure `mbedtls_x509_crt_frame`, however,
only provides pointers to the raw ASN.1 buffers for the issuer
and subject, for reasons of memory usage.

For convenience to users that previously used the `issuer`/`subject`
fields of `mbedtls_x509_crt`, this commit adds two public API functions
`mbedtls_x509_crt_get_subject()` and `mbedtls_x509_crt_get_issuer()`
which allow to request the legacy linked list presentation of the
CRTs subject / issuer names.

Similar to `mbedtls_x509_crt_get_pk()`, the returned names are owned
by the user, and must be freed through a call to `mbedtls_x509_name_free()`.