eval_sum_rows: Sum the rows or the columns of an encrypted matrix

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

Sum the rows or the columns of an encrypted matrix

Description

A matrix is packed into the slots row by row. eval_sum_rows() adds its rows together and eval_sum_cols() its columns. Each takes the keys made by the matching key generator, which returns them as an EvalKeyMap.

Usage

eval_sum_rows(ct, num_rows, eval_sum_key_map, subring_dim = 0L)

eval_sum_cols(ct, num_cols, eval_sum_key_map)

eval_sum_rows_key_gen(
  cc,
  sk,
  public_key = NULL,
  row_size = 0L,
  subring_dim = 0L
)

eval_sum_cols_key_gen(cc, sk)

Arguments

ct	A Ciphertext holding the matrix.
num_rows, num_cols	Integer; the number of rows, or columns, of the matrix.
eval_sum_key_map	An EvalKeyMap from eval_sum_rows_key_gen() or eval_sum_cols_key_gen().
subring_dim	Integer; the subring dimension, 0L (default) for the full ring.
cc	A CryptoContext.
sk	A PrivateKey.
public_key	A PublicKey, or NULL (default) for the form that takes no public key.
row_size	Integer; the length of a row, 0L (default) for the value the library derives.

Value

eval_sum_rows() and eval_sum_cols() return a Ciphertext; the key generators return an EvalKeyMap.

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