Add frontend, backend and CLI

cli/packages/util/crypto.go

@@ -0,0 +1,31 @@
+package util
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func DecryptSymmetric(key []byte, encryptedPrivateKey []byte, tag []byte, IV []byte) ([]byte, error) {
+	log.Debugln("Key:", key, "encryptedPrivateKey", encryptedPrivateKey, "tag", tag, "IV", IV)
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	aesgcm, err := cipher.NewGCMWithNonceSize(block, len(IV))
+	if err != nil {
+		return nil, err
+	}
+
+	var nonce = IV
+	var ciphertext = append(encryptedPrivateKey, tag...)
+
+	plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return plaintext, nil
+}