mbedtls_pk_parse_public_key() function

0 if successful, or a specific PK or PEM error code

On entry, ctx must be empty, either freshly initialised with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a specific key type, check the result with mbedtls_pk_can_do(). The key is also checked for correctness.