dev/command-saving (#1)

Reviewed-on: #1
Co-authored-by: jake <jake.young.dev@gmail.com>
Co-committed-by: jake <jake.young.dev@gmail.com>

cryptography/aes.go

@@ -0,0 +1,49 @@
+package cryptography
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+
+	"github.com/spf13/viper"
+)
+
+func EncryptPassword(b []byte) ([]byte, error) {
+	nonce := viper.Get("nonce").(string)
+	dev := viper.Get("device").(string)
+
+	block, err := aes.NewCipher([]byte(dev))
+	if err != nil {
+		return nil, err
+	}
+
+	aesg, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	ct := aesg.Seal(nil, []byte(nonce), []byte(b), nil)
+	return ct, nil
+}
+
+func DecryptPassword(b []byte) (string, error) {
+	nonce := viper.Get("nonce").(string)
+	password := viper.Get("password").(string)
+	dev := viper.Get("device").(string)
+
+	block, err := aes.NewCipher([]byte(dev))
+	if err != nil {
+		return "", err
+	}
+
+	aesg, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	op, err := aesg.Open(nil, []byte(nonce), []byte(password), nil)
+	if err != nil {
+		return "", err
+	}
+
+	return string(op), nil
+}