Utils

This document is better viewed at https://docs.openzeppelin.com/confidential-contracts/api/utils

Miscellaneous contracts and libraries containing utility functions you can use to improve security, and ease integrations when working with confidential contracts.

  • TFHESafeMath: Implementation of safe math operations for encrypted values.

Math

TFHESafeMath 

import "@openzeppelin/confidential-contracts/utils/TFHESafeMath.sol";

Library providing safe arithmetic operations for encrypted values to handle potential overflows in FHE operations.

Functions

  • tryIncrease(oldValue, delta)

  • tryDecrease(oldValue, delta)

tryIncrease(euint64 oldValue, euint64 delta) → ebool success, euint64 updated internal

Try to increase the encrypted value oldValue by delta. If the operation is successful, success will be true and updated will be the new value. Otherwise, success will be false and updated will be the original value.

tryDecrease(euint64 oldValue, euint64 delta) → ebool success, euint64 updated internal

Try to decrease the encrypted value oldValue by delta. If the operation is successful, success will be true and updated will be the new value. Otherwise, success will be false and updated will be the original value.

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