package crypto import ( "crypto/aes" "crypto/cipher" "v2ray.com/core/common" ) // NewAesDecryptionStream creates a new AES encryption stream based on given key and IV. // Caller must ensure the length of key and IV is either 16, 24 or 32 bytes. func NewAesDecryptionStream(key []byte, iv []byte) cipher.Stream { return NewAesStreamMethod(key, iv, cipher.NewCFBDecrypter) } // NewAesEncryptionStream creates a new AES description stream based on given key and IV. // Caller must ensure the length of key and IV is either 16, 24 or 32 bytes. func NewAesEncryptionStream(key []byte, iv []byte) cipher.Stream { return NewAesStreamMethod(key, iv, cipher.NewCFBEncrypter) } func NewAesStreamMethod(key []byte, iv []byte, f func(cipher.Block, []byte) cipher.Stream) cipher.Stream { aesBlock, err := aes.NewCipher(key) common.Must(err) return f(aesBlock, iv) } func NewAesCTRStream(key []byte, iv []byte) cipher.Stream { return NewAesStreamMethod(key, iv, cipher.NewCTR) }