feat: migrated the operator code to v4

k8-operator/internal/crypto/crypto.go

@@ -0,0 +1,42 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"fmt"
+	"hash/crc32"
+
+	"golang.org/x/crypto/nacl/box"
+)
+
+func DecryptSymmetric(key []byte, encryptedPrivateKey []byte, tag []byte, IV []byte) ([]byte, error) {
+	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
+}
+
+func DecryptAsymmetric(ciphertext []byte, nonce []byte, publicKey []byte, privateKey []byte) (plainText []byte) {
+	plainTextToReturn, _ := box.Open(nil, ciphertext, (*[24]byte)(nonce), (*[32]byte)(publicKey), (*[32]byte)(privateKey))
+	return plainTextToReturn
+}
+
+func ComputeEtag(data []byte) string {
+	crc := crc32.ChecksumIEEE(data)
+	return fmt.Sprintf(`W/"secrets-%d-%08X"`, len(data), crc)
+}