Evaluate an arbitrary function on an encrypted value

Functional bootstrapping with a precomputed lookup table. The context must have been created with arb_func = TRUE.

Usage

eval_func(ctx, ct, lut)

Arguments

ctx

A BinFHE context built with arb_func = TRUE

ct

An LWECiphertext encrypted with output = BinFHEOutput$LARGE_DIM

lut

A numeric vector of length p (the plaintext modulus) typically produced by generate_lut_via_function()

Value

An LWECiphertext encrypting lut[plaintext(ct) + 1]