Struct GLWEPacker 

pub struct GLWEPacker { /* private fields */ }

GLWEPacker enables only the fly GLWE packing with constant memory of Log(N) ciphertexts. Main difference with usual GLWE packing is that the output is bit-reversed.

Implementations

impl GLWEPacker

pub fn alloc<A>(infos: &A, log_batch: usize) -> Self

where A: GLWEInfos,

Instantiates a new GLWEPacker.

Arguments

• log_batch: packs coefficients which are multiples of X^{N/2^log_batch}. i.e. with log_batch=0 only the constant coefficient is packed and N GLWE ciphertext can be packed. With log_batch=2 all coefficients which are multiples of X^{N/4} are packed. Meaning that N/4 ciphertexts can be packed.

pub fn tmp_bytes<R, K, M, BE: Backend>( module: &M, res_infos: &R, key_infos: &K, ) -> usize

where R: GLWEInfos, K: GGLWEInfos, M: GLWEPacking<BE>,

Number of scratch space bytes required to call Self::add.

pub fn galois_elements<M, BE: Backend>(module: &M) -> Vec<i64>

where M: GLWETrace<BE>,

pub fn add<A, K, M, BE: Backend>( &mut self, module: &M, a: Option<&A>, auto_keys: &HashMap<i64, K>, scratch: &mut Scratch<BE>, )

where A: GLWEToRef + GLWEInfos, K: GGLWEPreparedToRef<BE> + GetGaloisElement + GGLWEInfos, M: GLWEPacking<BE>, Scratch<BE>: ScratchTakeCore<BE>,

Adds a GLWE ciphertext to the GLWEPacker. #Arguments

• module: static backend FFT tables.
• res: space to append fully packed ciphertext. Only when the number of packed ciphertexts reaches N/2^log_batch is a result written.
• a: ciphertext to pack. Can optionally give None to pack a 0 ciphertext.
• auto_keys: a HashMap containing the [AutomorphismKeyExec]s.
• scratch: scratch space of size at least Self::tmp_bytes.

pub fn flush<R, M, BE: Backend>(&mut self, module: &M, res: &mut R)

where R: GLWEToMut, M: GLWEPacking<BE>,

Flush result tores.