speck

README

SPECK

An implementation of some variants of the SPECK block cipher written in Go.

Supported Variants

Block size	Key size
64	128
128	128
128	256

I have decided to not ever implement 96 bit and 192 bit keys as they are pointless in my opinion, and I've never seen anyone use a 192 bit key and I feel wrong using 96 bit keys.

References

• The Simon and Speck Families of Lightweight Block Ciphers
• SIMON and SPECK Implementation Guide

Notes

I wouldn't recommend using SPECK unless you really have to. If you need a block cipher I recommend AES-256 (see: cipher/aes).

I also don't know the security of this library, so you should only use it at your own risk.

Documentation

Index

• type Speck64
  • func New64(key []byte) (*Speck64, error)
  • func (s Speck64) BlockSize() int
  • func (s *Speck64) Decrypt(dst, src []byte)
  • func (s *Speck64) Encrypt(dst, src []byte)
• type Speck128
  • func New128(key []byte) (*Speck128, error)
  • func (s Speck128) BlockSize() int
  • func (s *Speck128) Decrypt(dst, src []byte)
  • func (s *Speck128) Encrypt(dst, src []byte)

Types

type Speck64

type Speck64 struct {
	// contains filtered or unexported fields
}

64 bit blocks

func New64

func New64(key []byte) (*Speck64, error)

func (Speck64) BlockSize

func (s Speck64) BlockSize() int

func (*Speck64) Decrypt

func (s *Speck64) Decrypt(dst, src []byte)

func (*Speck64) Encrypt

func (s *Speck64) Encrypt(dst, src []byte)

type Speck128

type Speck128 struct {
	// contains filtered or unexported fields
}

128 bit blocks

func New128

func New128(key []byte) (*Speck128, error)

func (Speck128) BlockSize

func (s Speck128) BlockSize() int

func (*Speck128) Decrypt

func (s *Speck128) Decrypt(dst, src []byte)

func (*Speck128) Encrypt

func (s *Speck128) Encrypt(dst, src []byte)