present.go's Introduction

PRESENT.go

Go implementation of the PRESENT ultra-lightweight block cipher as defined by Bogdanov et al. [1].

Not to be confused with the Go presentation tool package and command.

Usage

This package implements the cipher.Block interface from crypto/cipher, so it can be used with the block cipher modes implemented there, just like the crypto/aes package.

Example

One of the test vectors from the PRESENT paper:

package main

import (
	"encoding/hex"
	"fmt"
	"log"

	"github.com/yi-jiayu/PRESENT.go"
)

func encodeHex(data []byte) string {
	dst := make([]byte, hex.EncodedLen(len(data)))
	hex.Encode(dst, data)
	return string(dst)
}

func main() {
	key := make([]byte, 10)
	fmt.Printf("%-10s : %s\n", "Key", encodeHex(key))
	cipher, err := present.NewCipher(key)
	if err != nil {
		log.Fatal(err)
	}
	plaintext := make([]byte, 8)
	fmt.Printf("%-10s : %s\n", "Plaintext", encodeHex(plaintext))
	ciphertext := make([]byte, 8)
	cipher.Encrypt(ciphertext, plaintext)
	fmt.Printf("%-10s : %s\n", "Ciphertext", encodeHex(ciphertext))
}

Output:

Key        : 00000000000000000000
Plaintext  : 0000000000000000
Ciphertext : 5579c1387b228445

References

Bogdanov A. et al. (2007) PRESENT: An Ultra-Lightweight Block Cipher. In: Paillier P., Verbauwhede I. (eds) Cryptographic Hardware and Embedded Systems - CHES 2007. CHES 2007. Lecture Notes in Computer Science, vol 4727. Springer, Berlin, Heidelberg (pdf)

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