# Functions
采用hmac进行2次hash, 取32位, 这样对key没有长度要求.
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PKCS7Padding 对数据进行 PKCS#7 填充.
PKCS7Unpadding 对数据进行 PKCS#7 去填充.
# Constants
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# Structs
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# Type aliases
aesCBCEncrypt aes加密，填充秘钥key的16位，24,32分别对应AES-128, AES-192, or AES-256.
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