crypto: Index | Files

package xtea

import ""

Package xtea implements XTEA encryption, as defined in Needham and Wheeler's 1997 technical report, "Tea extensions."

XTEA is a legacy cipher and its short block size makes it vulnerable to birthday bound attacks (see It should only be used where compatibility with legacy systems, not security, is the goal.

Deprecated: any new system should use AES (from crypto/aes, if necessary in an AEAD mode like crypto/cipher.NewGCM) or XChaCha20-Poly1305 (from


Package Files

block.go cipher.go


const BlockSize = 8

The XTEA block size in bytes.

type Cipher Uses

type Cipher struct {
    // contains filtered or unexported fields

A Cipher is an instance of an XTEA cipher using a particular key.

func NewCipher Uses

func NewCipher(key []byte) (*Cipher, error)

NewCipher creates and returns a new Cipher. The key argument should be the XTEA key. XTEA only supports 128 bit (16 byte) keys.

func (*Cipher) BlockSize Uses

func (c *Cipher) BlockSize() int

BlockSize returns the XTEA block size, 8 bytes. It is necessary to satisfy the Block interface in the package "crypto/cipher".

func (*Cipher) Decrypt Uses

func (c *Cipher) Decrypt(dst, src []byte)

Decrypt decrypts the 8 byte buffer src using the key and stores the result in dst.

func (*Cipher) Encrypt Uses

func (c *Cipher) Encrypt(dst, src []byte)

Encrypt encrypts the 8 byte buffer src using the key and stores the result in dst. Note that for amounts of data larger than a block, it is not safe to just call Encrypt on successive blocks; instead, use an encryption mode like CBC (see crypto/cipher/cbc.go).

type KeySizeError Uses

type KeySizeError int

func (KeySizeError) Error Uses

func (k KeySizeError) Error() string

Package xtea imports 1 packages (graph) and is imported by 34 packages. Updated 2020-07-29. Refresh now. Tools for package owners.