Add Encrypt() and Decrypt() functionality

pkg/transcrypt/cipherSuite.go

@@ -0,0 +1,19 @@
+package transcrypt
+
+type CipherSuite byte
+
+const (
+	AES_256_GCM CipherSuite = iota
+	CHACHA20_POLY1305
+)
+
+func GetCipherSuite(s string) CipherSuite {
+	switch s {
+	case "AES_256_GCM":
+		return AES_256_GCM
+	case "CHACHA20_POLY1305":
+		return CHACHA20_POLY1305
+	default:
+		return CHACHA20_POLY1305
+	}
+}