SchemeSwitchingDataSerializer: Write and read the data of a scheme-switching computation

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

Write and read the data of a scheme-switching computation

Description

A scheme-switching computation needs a CKKS context with its public key and evaluation keys, the FHEW context inside it with its bootstrapping keys, the switching key from FHEW to CKKS, and the ciphertext to work on. SchemeSwitchingDataSerializer writes all of it to a directory, and SchemeSwitchingDataDeserializer reads it back in another session, so that one party can set the computation up and another can run it.

Usage

SchemeSwitchingDataSerializer(
  crypto_context = NULL,
  public_key = NULL,
  raw_ciphertext = NULL,
  ptr = NULL
)

SchemeSwitchingDataDeserializer(ptr = NULL)

set_data_directory(x, dir)

serialize_scheme_switching_data(x)

deserialize_scheme_switching_data(x)

get_raw_ciphertext(x)

Arguments

crypto_context	A CKKS CryptoContext on which scheme switching has been set up and its keys generated (eval_scheme_switching_setup(), eval_scheme_switching_key_gen()).
public_key	The PublicKey of the context.
raw_ciphertext	The Ciphertext to write.
ptr	External pointer (internal use).
x	A SchemeSwitchingDataSerializer or SchemeSwitchingDataDeserializer.
dir	Character string; the directory.

Details

The writer is made from the context, the public key and the ciphertext. set_data_directory() names the directory, which must exist, and serialize_scheme_switching_data() writes the files (binary format, fixed file names). The multiplication and automorphism keys written are all those in the key registries.

The reader is made empty. After set_data_directory(), deserialize_scheme_switching_data() reads the files, registers the evaluation keys, and puts the FHEW context and the switching key into the CKKS context. get_crypto_context(), get_public_key() and get_raw_ciphertext() then return the three objects.

The C++ classes default the directory to demoData under the working directory. The R functions do not: reading or writing before set_data_directory() is an error.

Value

The constructors: an S7 object of the class, inheriting from OpenFHEObject. get_raw_ciphertext(): a Ciphertext, or NULL before the data has been read. The others: x, invisibly.

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