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Construct a Function from a user-defined callback. Can be used to build a postprocessor.

Source: R/core.R
new_function.Rd

Required features: contrib, honest-but-curious

Usage

new_function(function_, .TO)

Arguments

function_

A function mapping data to a value of type TO

.TO

Output Type

Value

Function

Details

new_function in Rust documentation.

Why honest-but-curious?:

An OpenDP function must satisfy two criteria. These invariants about functions are necessary to show correctness of other algorithms.

First, function must not use global state. For instance, a postprocessor that accesses the system clock time can be used to build a measurement that reveals elapsed execution time, which escalates a side-channel vulnerability into a direct vulnerability.

Secondly, function must only raise data-independent exceptions. For instance, raising an exception with the value of a DP release will both reveal the DP output and cancel the computation, potentially avoiding privacy accounting.