Add ciphertext check (#5930)

include/xrpl/protocol/ConfidentialTransfer.h

@@ -130,6 +130,14 @@ serializeEcPair(
     secp256k1_pubkey const& in2,
     Buffer& buffer);
 
+/**
+ * @brief Verifies that a buffer contains two valid, parsable EC public keys.
+ * @param buffer The input buffer containing two concatenated components.
+ * @return true if both components can be parsed successfully, false otherwise.
+ */
+bool
+isValidCiphertext(Slice const& buffer);
+
 TER
 homomorphicAdd(Slice const& a, Slice const& b, Buffer& out);
 

include/xrpl/protocol/TER.h

@@ -141,6 +141,7 @@ enum TEMcodes : TERUnderlyingType {
     temARRAY_TOO_LARGE,
     temBAD_TRANSFER_FEE,
     temINVALID_INNER_BATCH,
+    temBAD_CIPHERTEXT,
 };
 
 //------------------------------------------------------------------------------