feat: persist encrypted env

server/utils/crypto.go

@@ -0,0 +1,83 @@
+package utils
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"io"
+
+	"github.com/authorizerdev/authorizer/server/constants"
+)
+
+func EncryptB64(text string) string {
+	return base64.StdEncoding.EncodeToString([]byte(text))
+}
+
+func DecryptB64(s string) (string, error) {
+	data, err := base64.StdEncoding.DecodeString(s)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+func EncryptAES(text []byte) ([]byte, error) {
+	key := []byte(constants.EnvData.ENCRYPTION_KEY)
+	c, err := aes.NewCipher(key)
+	var res []byte
+	if err != nil {
+		return res, err
+	}
+
+	// gcm or Galois/Counter Mode, is a mode of operation
+	// for symmetric key cryptographic block ciphers
+	// - https://en.wikipedia.org/wiki/Galois/Counter_Mode
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return res, err
+	}
+
+	// creates a new byte array the size of the nonce
+	// which must be passed to Seal
+	nonce := make([]byte, gcm.NonceSize())
+	// populates our nonce with a cryptographically secure
+	// random sequence
+	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+		return res, err
+	}
+
+	// here we encrypt our text using the Seal function
+	// Seal encrypts and authenticates plaintext, authenticates the
+	// additional data and appends the result to dst, returning the updated
+	// slice. The nonce must be NonceSize() bytes long and unique for all
+	// time, for a given key.
+	return gcm.Seal(nonce, nonce, text, nil), nil
+}
+
+func DecryptAES(ciphertext []byte) ([]byte, error) {
+	key := []byte(constants.EnvData.ENCRYPTION_KEY)
+	c, err := aes.NewCipher(key)
+	var res []byte
+	if err != nil {
+		return res, err
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return res, err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return res, err
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return res, err
+	}
+
+	return plaintext, nil
+}