API changes
   * For all functions that take a random number generator (RNG) as a
     parameter, this parameter is now mandatory (that is, NULL is not an
     acceptable value). Functions which previously accepted NULL and now
     reject it are: the X.509 CRT and CSR writing functions; the PK and RSA
     sign and decrypt function; mbedtls_rsa_private(); the functions
     in DHM and ECDH that compute the shared secret; the scalar multiplication
     functions in ECP.
   * The following functions now require an RNG parameter:
     mbedtls_ecp_check_pub_priv(), mbedtls_pk_check_pair(),
     mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile().
Removals
   * The configuration option MBEDTLS_ECP_NO_INTERNAL_RNG has been removed as
     it no longer had any effect.