Function EncryptAES

internal/crypto/aes.go:31–55

EncryptAES encrypts plaintext using AES-256-GCM. The nonce is prepended to the ciphertext and the result is encoded as base64 RawURL.

(key, text string)

// EncryptAES encrypts plaintext using AES-256-GCM. The nonce is prepended to
// the ciphertext and the result is encoded as base64 RawURL.
func EncryptAES(key, text string) (string, error) {
	keyBytes, err := deriveAESKey(key)
	if err != nil {
		return "", err
	}

	block, err := aes.NewCipher(keyBytes)
	if err != nil {
		return "", err
	}

	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return "", err
	}

	nonce := make([]byte, gcm.NonceSize())
	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
		return "", err
	}

	// Seal appends the encrypted and authenticated ciphertext to nonce.
	ciphertext := gcm.Seal(nonce, nonce, []byte(text), nil)
	return base64.RawURLEncoding.EncodeToString(ciphertext), nil
}

// DecryptAES decrypts a base64 RawURL-encoded AES-256-GCM ciphertext produced
// by EncryptAES. Returns an error if authentication fails or input is malformed.