eval_fe_func_bootstrap_setup: CKKS functional bootstrapping of a Fourier series

In openfhe.R: R Interface to the 'OpenFHE' Fully Homomorphic Encryption Library

CKKS functional bootstrapping of a Fourier series

Description

Refreshes a ciphertext and evaluates on its values the function whose Fourier coefficients are coefficients, in the same step (CKKS with CKKSDataType$COMPLEX).

Usage

eval_fe_func_bootstrap_setup(
  cc,
  level_budget = c(5L, 4L),
  dim1 = c(0L, 0L),
  slots = 0L
)

eval_fe_func_bootstrap(ct, coefficients)

eval_fe_func_bootstrap_precompute(ct, coefficients)

eval_fe_func_bootstrap_with_precomp(powers, coefficients)

Arguments

cc	A CKKS CryptoContext with Feature$FHE enabled.
level_budget	Integer vector of length 2. Default c(5L, 4L).
dim1	Integer vector of length 2. Default c(0L, 0L).
slots	Integer; number of slots, 0L (default) for full packing.
ct	A Ciphertext.
coefficients	Numeric or complex vector of Fourier coefficients.
powers	A SeriesPowers object from eval_fe_func_bootstrap_precompute().

Details

eval_fe_func_bootstrap_setup() prepares the context; call eval_bootstrap_key_gen() after it. eval_fe_func_bootstrap() does the whole evaluation. eval_fe_func_bootstrap_precompute() and eval_fe_func_bootstrap_with_precomp() split it, so that several series of the same length can be evaluated on one input.

The setup shares the bootstrapping precomputation of the context for slots with eval_bootstrap_setup() and eval_fbt_setup(): a context holds one of the three per slot count.

Value

eval_fe_func_bootstrap_setup(): cc, invisibly. eval_fe_func_bootstrap_precompute(): a SeriesPowers object. The others: a Ciphertext.

See Also

get_fefbt_depth()

openfhe.R documentation built on Nov. 13, 2026, 5:07 p.m.