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package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"errors"
"fmt"
"io"
"log"
"os"
"github.com/joho/godotenv"
)
func main() {
err := godotenv.Load()
if err != nil {
log.Fatal("Error loading .env file")
}
base64kek := os.Getenv("SECRET_KEY")
kek, err := base64.StdEncoding.DecodeString(base64kek)
if err != nil {
panic(err)
}
dek := GenCipherKey()
encryptedDek, err := Encrypt(dek, kek)
if err != nil {
panic(err)
}
fmt.Println("edek", encryptedDek)
cipherText, err := Encrypt([]byte("hello"), dek)
if err != nil {
panic(err)
}
fmt.Println("ciphertext", cipherText)
}
type CipherKey []byte
func GenCipherKey() CipherKey {
key := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, key); err != nil {
log.Fatalf("random key gen: %v", err)
}
return CipherKey(key)
}
func Encrypt(plaintext []byte, key CipherKey) ([]byte, error) {
c, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
return gcm.Seal(nonce, nonce, plaintext, nil), nil
}
func Decrypt(ciphertext []byte, key CipherKey) ([]byte, error) {
c, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonceSize := gcm.NonceSize()
if len(ciphertext) < nonceSize {
return nil, errors.New("ciphertext too short")
}
nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
return gcm.Open(nil, nonce, ciphertext, nil)
}
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