| 1234567891011121314151617 | package cryptoimport (	"crypto/aes"	"crypto/cipher"	"io")func NewAesDecryptionStream(key []byte, iv []byte) cipher.Stream {	aesBlock, _ := aes.NewCipher(key)	return cipher.NewCFBDecrypter(aesBlock, iv)}func NewAesEncryptionStream(key []byte, iv []byte) cipher.Stream {	aesBlock, _ := aes.NewCipher(key)	return cipher.NewCFBEncrypter(aesBlock, iv)}
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