chacha20poly1305_scrypt_block

README

Simple wrapper around chacha20poly1305 and scrypt

Simple wrapper around the chacha20poly1305 and scrypt hash to encrypt small chunks of data.
Can be used as a library or as a command line tool located in cmd/cipherCli.

Library usage

package main

import (
	"bytes"
	"log"

	cipher "github.com/8ff/chacha20poly1305_scrypt_block"
)

func main() {
	data := []byte("Hello world")
	key := make([]byte, cipher.ParamDefaults.KeySize)
	// Set key to some long phrase that is of key size
	copy(key, []byte("This is a long phrase that is of key size"))

	// Initialize cipher
	c, err := cipher.Init(cipher.Params{Key: key})
	if err != nil {
		log.Fatalf("Failed to initialize cipher: %v", err)
	}

	// Encrypt data
	encrypted, err := c.Encrypt(data)
	if err != nil {
		log.Fatalf("Failed to encrypt data: %v", err)
	}

	// Decrypt data
	decrypted, err := c.Decrypt(encrypted)
	if err != nil {
		log.Fatalf("Failed to decrypt data: %v", err)
	}

	// Verify that decrypted data is the same as original data
	if !bytes.Equal(data, decrypted) {
		log.Fatalf("Decrypted data is not the same as original data")
	}

	// Print Input and decrypted string
	log.Printf("Input: %s\n", data)
	log.Printf("Decrypted: %s\n", decrypted)
}

Command line usage

foo@bar:~$ cd cmd/cipherCli
foo@bar:~$ cipherCli % echo test | CKEY=test go run cipherCli.go e | CKEY=test go run cipherCli.go d
test

Disclaimer

This is a very simple wrapper around the chacha20poly1305 and scrypt hash. It has not been audited, use at your own risk.

Documentation

Index

• Variables
• type Params
  • func Init(params Params) (*Params, error)
  • func (c *Params) Decrypt(data []byte) ([]byte, error)
  • func (c *Params) Encrypt(data []byte) ([]byte, error)

Variables

var ParamDefaults = Params{
	SaltSize:  32,
	NonceSize: chacha20poly1305.NonceSizeX,
	KeySize:   chacha20poly1305.KeySize,
}

Sane defaults

Types

type Params

type Params struct {
	SaltSize  int
	NonceSize int
	KeySize   int
	Key       []byte
}

func Init

func Init(params Params) (*Params, error)

func (*Params) Decrypt

func (c *Params) Decrypt(data []byte) ([]byte, error)

Decrypt function based on chacha20poly1305 and scrypt

func (*Params) Encrypt

func (c *Params) Encrypt(data []byte) ([]byte, error)

Encrypt function based on chacha20poly1305 and scrypt