eval_add_many: Add or multiply a list of ciphertexts

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

Add or multiply a list of ciphertexts

Description

eval_add_many() returns the sum of a list of ciphertexts and eval_mult_many() their product, each computed as a binary tree, which keeps the multiplicative depth of the product at ceiling(log2(n)). eval_mult_many() relinearizes after every multiplication and needs the relinearization key.

Usage

eval_add_many(ciphertexts)

eval_add_many_in_place(ciphertexts)

eval_mult_many(ciphertexts)

Arguments

ciphertexts

A non-empty list of Ciphertext objects.

Details

eval_add_many_in_place() computes the same sum but uses the given ciphertexts for its intermediate results: after the call they hold partial sums, and the first one holds the total.

Value

A Ciphertext.

Examples

cc <- fhe_context("BFV", plaintext_modulus = 65537, multiplicative_depth = 2,
                  features = Feature$ADVANCEDSHE)
kp <- key_gen(cc, eval_mult = TRUE)
cts <- lapply(1:4, function(i)
  encrypt(kp@public, make_packed_plaintext(cc, c(i, 2L * i)), cc = cc))
total <- decrypt(eval_add_many(cts), kp@secret, cc = cc)
get_packed_value(set_length(total, 2L))

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