### a(n) is hmac-sha256(key=secret, data=a(n-1))
Фото: mama_mia / Shutterstock / Fotodom
，这一点在heLLoword翻译官方下载中也有详细论述
Param[Literal["e"], int, Literal["default", "keyword"]],
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The client has sent an initialization vector for decrypting this block.