//go:build encon
// +build encon

package crypto

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

func Decrypt(hexedcipher string) (plaintext string, err error) {
	aes, err := aes.NewCipher(someDumbKey)
	if err != nil {
		return "", fmt.Errorf("making new cipher: %w", err)
	}
	gcm, err := cipher.NewGCM(aes)
	if err != nil {
		return "", fmt.Errorf("making new gcm: %w", err)
	}

	nonceSize := gcm.NonceSize()
	valueDecoded, err := hex.DecodeString(hexedcipher)
	if err != nil {
		return "", fmt.Errorf("decoding hexed value: %w", err)
	}
	nonce, cipherText := valueDecoded[:nonceSize], valueDecoded[nonceSize:]
	plaintextRaw, err := gcm.Open(nil, []byte(nonce), []byte(cipherText), nil)
	if err != nil {
		return "", fmt.Errorf("opening: %w", err)
	}

	return string(plaintextRaw), nil
}