package protectString

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/hex"
	"fmt"
)

func Decrypt(encryptedString string, keyString string) (decryptedString string) {
	key, _ := hex.DecodeString(keyString)
	enc, _ := hex.DecodeString(encryptedString)

	//Create a new Cipher Block from the key
	block, err := aes.NewCipher(key)
	if err != nil {
		panic(err.Error())
	}

	//Create a new GCM
	aesGCM, err := cipher.NewGCM(block)
	if err != nil {
		panic(err.Error())
	}

	//Get the nonce size
	nonceSize := aesGCM.NonceSize()

	//Extract the nonce from the encrypted data
	nonce, ciphertext := enc[:nonceSize], enc[nonceSize:]

	//Decrypt the data
	plaintext, err := aesGCM.Open(nil, nonce, ciphertext, nil)
	if err != nil {
		panic(err.Error())
	}

	return fmt.Sprintf("%s", plaintext)
}