✨Secure Operations and Gas

Secure operations are supported via our gcEVM extension, which is implemented through a set of precompiled contracts.

To bring a new private data into the gvEVM the function's signature should include an argument of type Inputtext. Then, inside the function, it is necessary to call ValidateCiphertext, which returns a Garbledtext if verification succeeds and an error otherwise. Then, the contract is free to save private data temporarily in Memory, by calling Offboard on the relevant Garbledtext.This returns a private data of type Ciphertext that awaits other commands, namely, the Ciphertext type cannot serve as an operand to secure operations, rather it should be Onboarded again and turn into a Garbledtext first; alternatively, the Ciphertext may be stored permanently by simply assigning it to a state variable of the contract.

List of Operations and Their Required Gas

We have set a required gas for each operation within the network. It's important to note that the following gas allocations are intended to be proportional and serve as initial estimates. The final determination of gas requirements will be made at a later stage, taking into account various factors such as network performance, usage patterns, and protocol optimizations.

List of operations supported on Garbledtextand their required gas prices

Operation	Bool	gtUint8	gtUint16	gtUint32	gtUint64
And	12005	12040	12080	12160	12320
Or	12005	12042	12084	12169	12339
Xor	12000	12000	12001	12003	12006
Add		12037	12080	12167	12340
Sub		12080	12165	12337	12679
Mul		12620	14571	22467	54233
Div		12969	15960	28009	76377
Rem		12969	15960	28009	76377
Min	12010	12121	12249	12503	13012
Max	12010	12121	12249	12503	13012
Lt	12005	12080	12166	12337	12679
Gt	12010	12121	12249	12503	13012
Ge	12005	12080	12165	12337	12679
Le	12010	12122	12249	12503	13012
Eq	12000	12037	12079	12164	12334
Ne	12000	12037	12079	12164	12334
Shl		12620	14571	22467	54233
Shr		12969	15960	28009	76377
Not	12000

Other Special Function and Their Required Gas

A more detailed explanation on the functionality of these functions can be found in the following link.

🤩Special Functions

Operation	gtBool	gtUint8	gtUint16	gtUint32	gtUint64
SetPublic	12000	12000	12001	12003	12006
Decrypt	12000	12000	12001	12003	12006
Onboard	47039	47039	47039	47039	47039
	47039	47039	47039	47039	47039
Offboard	47039	47040	47040	47042	47045
OffboardToUser	47039	47040	47040	47042	47045
Rand	6000	6000	6000	6000	6000
RandBoundedBits	6000	6000	6000	6000	6000
Mux	12005	12041	12083	12166	12332
Transfer		12201	12413	12837	13685
TransferWithAllowance		12301	12619	13255	14527

The operation GetUserKey that generates an aes key for the user has a gas cost of 47039