get_fbt_depth: Multiplicative depth of functional bootstrapping

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

Multiplicative depth of functional bootstrapping

Description

get_fbt_depth() gives the depth eval_fbt() consumes for a look-up table, and get_fefbt_depth() the depth eval_fe_func_bootstrap() consumes for a Fourier series. Add the levels wanted after bootstrapping to get the multiplicative_depth of the context.

Usage

get_fbt_depth(
  level_budget,
  coefficients,
  p_input,
  order,
  skd,
  first_mod_size = 60L
)

get_fefbt_depth(
  level_budget,
  coefficients,
  skd = SecretKeyDist$SPARSE_TERNARY,
  first_mod_size = 60L
)

Arguments

level_budget	Integer vector of length 2; the levels spent on the coefficients-to-slots and slots-to-coefficients transforms.
coefficients	The coefficients of the look-up table (as for eval_fbt()) or of the Fourier series.
p_input	The input plaintext modulus: a string of decimal digits, or a whole number of at most 2^53.
order	Integer; the order of the Hermite interpolation.
skd	Secret key distribution, an element of SecretKeyDist.
first_mod_size	Integer; size of the first modulus in bits (read only for SecretKeyDist$SPARSE_ENCAPSULATED). Default 60L.

Value

An integer.

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