crypto.go

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"io"
)

func Encrypt(data []byte, passphrase []byte) []byte {
	block, _ := aes.NewCipher([]byte(CreateHash(passphrase)))
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		panic(err.Error())
	}
	nonce := make([]byte, gcm.NonceSize())
	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
		panic(err.Error())
	}
	ciphertext := gcm.Seal(nonce, nonce, data, nil)
	return ciphertext
}

func Decrypt(data []byte, passphrase []byte) []byte {
	key := []byte(CreateHash(passphrase))
	block, err := aes.NewCipher(key)
	if err != nil {
		panic(err.Error())
	}
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		panic(err.Error())
	}
	nonceSize := gcm.NonceSize()
	nonce, ciphertext := data[:nonceSize], data[nonceSize:]
	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
	if err != nil {
		panic(err.Error())
	}
	return plaintext
}