security: Add BlockCipher in transformation

Change-Id: I2c09509acd69e7f9270ef8c9b6e5e16ede2a8042
Refs: #3009
diff --git a/src/security/security-common.cpp b/src/security/security-common.cpp
index 0f8714d..0ea60cb 100644
--- a/src/security/security-common.cpp
+++ b/src/security/security-common.cpp
@@ -105,6 +105,23 @@
 }
 
 std::ostream&
+operator<<(std::ostream& os, CipherOperator op)
+{
+  switch (op) {
+  case CipherOperator::DECRYPT:
+    os << "DECRYPT";
+    break;
+  case CipherOperator::ENCRYPT:
+    os << "ENCRYPT";
+    break;
+  default:
+    os << static_cast<int>(op);
+    break;
+  };
+  return os;
+}
+
+std::ostream&
 operator<<(std::ostream& os, AclType aclType)
 {
   switch (aclType) {