Add Encrypt() and Decrypt() functionality

pkg/transcrypt/encrypt.go

@@ -0,0 +1,55 @@
+package transcrypt
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/minio/sio"
+)
+
+func Encrypt(key string, cipherSuite CipherSuite, d any) (string, error) {
+	if key == "" {
+		return "", errors.New("key is empty")
+	}
+
+	if d == nil {
+		return "", errors.New("data is nil")
+	}
+
+	var err error
+	var data string
+	// Convert input data to reflect.Value before serialization
+	if data, err = convertValueToHexString(reflect.ValueOf(d)); err != nil {
+		return "", err
+	}
+
+	var cryptoConfig sio.Config
+	if cryptoConfig, err = createCryptoConfig(key, []byte{byte(cipherSuite)}, nil); err != nil {
+		return "", err
+	}
+
+	encryptedData := bytes.NewBuffer(make([]byte, 0))
+	if _, err = sio.Encrypt(encryptedData, bytes.NewBuffer([]byte(data)), cryptoConfig); err != nil {
+		return "", err
+	}
+
+	// Encode all details in hex before joining together
+	encryptedString := strings.Join(
+		[]string{
+			hex.EncodeToString([]byte{byte(cipherSuite)}),
+			hex.EncodeToString(cryptoConfig.Nonce[:]),
+			hex.EncodeToString(encryptedData.Bytes()),
+			hex.EncodeToString([]byte(reflect.TypeOf(d).Kind().String())),
+		}, ":",
+	)
+
+	if !regexEncryptedString.MatchString(encryptedString) {
+		return "", fmt.Errorf("could not validate encrypted data")
+	}
+
+	return encryptedString, nil
+}