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FR6972 AES加密问题

Hi :

    再使用FR6972 做AES加密时 ,出现以下疑问请帮忙解惑:

要求AES128加密,填充规则是No Padding时,加密数据长度不是16整数倍时怎么处理?

另外是否有AES加密相关文档说明帮忙提供一下,谢谢。