However, ANS X9.52 specifies directly, and NIST SP 800-67 specifies via SP 800-38A that some modes shall only be used with certain constraints on them that do not necessarily apply to general specifications of those modes.
然而，ANS X9.52和NIST SP 800-67（通过SP 800-38A）确定了某些模式只能在特定限制下应用，而无需普遍的应用。