Gas per Operation

Every value is measured on the deployed contracts and rounded to the nearest 100 gas.

The values are for the first FHE call in a transaction. Every later FHE call in the same transaction costs about 20,000 gas less.

X stands for the encrypted type: asEuint32, asEbool, shareEuint64, and so on. The seven encrypted types are ebool, euint8 through euint128, and eaddress; “All” means all seven. The type barely changes the price, so each value is the highest across the supported types.

Arithmetic

Operation	Gas	Types
`add`	51,600	`euint8` to `euint128`
`sub`	51,500	`euint8` to `euint128`
`mul`	52,600	`euint8` to `euint128`
`div`	52,300	`euint8` to `euint128`
`rem`	52,500	`euint8` to `euint128`
`square`	48,900	`euint8` to `euint128`
`min`	53,600	`euint8` to `euint128`
`max`	53,800	`euint8` to `euint128`

Comparison

Operation	Gas	Types
`eq`	52,700	All
`ne`	53,000	All
`lt`	53,000	`euint8` to `euint128`
`lte`	52,800	`euint8` to `euint128`
`gt`	53,300	`euint8` to `euint128`
`gte`	52,800	`euint8` to `euint128`

Bitwise and shift

Operation	Gas	Types
`and`	51,700	`ebool`, `euint8` to `euint128`
`or`	51,900	`ebool`, `euint8` to `euint128`
`xor`	51,500	`ebool`, `euint8` to `euint128`
`not`	45,700	`ebool`, `euint8` to `euint128`
`shl`	52,800	`euint8` to `euint128`
`shr`	52,900	`euint8` to `euint128`
`rol`	54,500	`euint8` to `euint128`
`ror`	54,600	`euint8` to `euint128`

Select

Operation	Gas	Types
`select`	55,900	All

Encrypt: create a ciphertext

Operation	Gas	Types
Trivial encrypt `asX(plaintext)`	45,400	All
Encrypted input `asX(InEuintX)`	39,800	All
Encrypted input from bytes `asX(bytes)`	40,400	All
Random `randomX()`	40,900	`euint8` to `euint128`

Cast between encrypted types

Operation	Gas	Types
Cast `asX(eY)`, target not `ebool`	45,900	Any to `euint8` to `euint128`
Cast to `ebool`, `asEbool(eY)`	75,800	Numeric types and `eaddress` to `ebool`

A cast to ebool costs more because FHE.sol implements it as ne(value, asX(0)): two TaskManager tasks instead of one.

Access control

All access-control operations support all seven types and cost the same for each. The two is* functions are view; they cost gas only when a contract calls them inside a transaction.

Operation	Gas
`allow`	44,700
`allowThis`	26,300
`allowSender`	44,700
`allowTransient`	23,000
`allowGlobal`	44,100
`allowPublic`	44,100
`isAllowed`	22,200
`isPubliclyAllowed`	21,900

Operation	Gas
`shareX`	25,900
`receiveXParam`	6,300
`receiveXFromCall`	6,300

Decryption results

The four verify* and get* functions are view; they cost gas only when a contract calls them inside a transaction.

Operation	Gas
`publishDecryptResult`	71,400
`verifyDecryptResult`	15,100
`verifyDecryptResultSafe`	15,700
`getDecryptResult`	24,300
`getDecryptResultSafe`	23,200

Introduction

Core Concepts

Confidential Contracts

Examples

Reference

Arithmetic

Comparison

Bitwise and shift

Select

Encrypt: create a ciphertext

Cast between encrypted types

Access control

Decryption results

​Arithmetic

​Comparison

​Bitwise and shift

​Select

​Encrypt: create a ciphertext

​Cast between encrypted types

​Access control

​Sharing

​Decryption results

Arithmetic

Comparison

Bitwise and shift

Select

Encrypt: create a ciphertext

Cast between encrypted types

Access control

Sharing

Decryption results