# package des

`import "crypto/des"`

des包实现了DES标准和TDEA算法，参见U.S. Federal Information Processing Standards Publication 46-3。

## Constants

    const BlockSize = 8

DES字节块的大小。

## type KeySizeError

    type KeySizeError int

### func (KeySizeError) Error

    func (k KeySizeError) Error() string

## func NewCipher

    func NewCipher(key []byte) (cipher.Block, error)

创建并返回一个使用DES算法的cipher.Block接口。

## func NewTripleDESCipher

    func NewTripleDESCipher(key []byte) (cipher.Block, error)

创建并返回一个使用TDEA算法的cipher.Block接口。

Example

    // NewTripleDESCipher can also be used when EDE2 is required by
    // duplicating the first 8 bytes of the 16-byte key.
    ede2Key := []byte("example key 1234")
    var tripleDESKey []byte
    tripleDESKey = append(tripleDESKey, ede2Key[:16]...)
    tripleDESKey = append(tripleDESKey, ede2Key[:8]...)
    _, err := des.NewTripleDESCipher(tripleDESKey)
    if err != nil {
        panic(err)
    }
    // See crypto/cipher for how to use a cipher.Block for encryption and
    // decryption.