Pedersen commitment with ConvertBack and basic test (#6243)

include/xrpl/protocol/Protocol.h

@@ -320,6 +320,9 @@ std::size_t constexpr ecSchnorrProofLength = 65;
 
 /** Length of ElGamal Pedersen linkage proof */
 std::size_t constexpr ecPedersenProofLength = 195;
+
+/** Length of Pedersen Commitment proof */
+std::size_t constexpr ecPedersenCommitmentLength = 64;
 }  // namespace ripple
 
 #endif

include/xrpl/protocol/detail/sfields.macro

@@ -313,6 +313,7 @@ TYPED_SFIELD(sfAuditorEncryptedBalance,  VL,        42)
 TYPED_SFIELD(sfAuditorEncryptedAmount,   VL,        43)
 TYPED_SFIELD(sfAuditorElGamalPublicKey,  VL,        44)
 TYPED_SFIELD(sfBlindingFactor,           VL,        45)
+TYPED_SFIELD(sfPedersenCommitment,       VL,        46)
 
 // account (common)
 TYPED_SFIELD(sfAccount,                  ACCOUNT,    1)

include/xrpl/protocol/detail/transactions.macro

@@ -1107,6 +1107,7 @@ TRANSACTION(ttCONFIDENTIAL_CONVERT_BACK, 87, ConfidentialConvertBack,
     {sfAuditorEncryptedAmount, soeOPTIONAL},
     {sfBlindingFactor, soeREQUIRED},
     {sfZKProof, soeREQUIRED},
+    {sfPedersenCommitment, soeREQUIRED}
 }))
 
 #if TRANSACTION_INCLUDE