In aes256_cmac_sw of aes.rs, there is a possible way to forge message authentication codes over multi-block messages due to improperly used…

In aes256_cmac_sw of aes.rs, there is a possible way to forge message authentication codes over multi-block messages due to improperly used crypto. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.