import "crypto/aes"
aes包实现了AES加密算法，参见U.S. Federal Information Processing Standards Publication 197。
Constants
type KeySizeError
func (k KeySizeError) Error() string
func NewCipher(key []byte) (cipher.Block, error)
const BlockSize = 16
AES字节块大小。
type KeySizeError int
创建一个cipher.Block接口。参数key为密钥，长度只能是16、24、32字节，用以选择AES-128、AES-192、AES-256。
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