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 new( n: usize, log_batch: usize, basek: usize, k: usize, rank: usize, ) -> Self

Instantiates a new GLWEPacker.

Arguments

• module: static backend FFT tables.
• 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.
• basek: base 2 logarithm of the GLWE ciphertext in memory digit representation.
• k: base 2 precision of the GLWE ciphertext precision over the Torus.
• rank: rank of the GLWE ciphertext.

pub fn scratch_space<B: Backend>( module: &Module<B>, basek: usize, ct_k: usize, k_ksk: usize, digits: usize, rank: usize, ) -> usize

where Module<B>: VecZnxDftAllocBytes + VmpApplyDftToDftTmpBytes + VecZnxBigNormalizeTmpBytes,

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

pub fn galois_elements<B: Backend>(module: &Module<B>) -> Vec<i64>

pub fn add<DataA: DataRef, DataAK: DataRef, B: Backend>( &mut self, module: &Module<B>, a: Option<&GLWECiphertext<DataA>>, auto_keys: &HashMap<i64, GGLWEAutomorphismKeyPrepared<DataAK, B>>, scratch: &mut Scratch<B>, )

where Module<B>: VecZnxDftAllocBytes + VmpApplyDftToDftTmpBytes + VecZnxBigNormalizeTmpBytes + VmpApplyDftToDft<B> + VmpApplyDftToDftAdd<B> + VecZnxDftApply<B> + VecZnxIdftApplyConsume<B> + VecZnxBigAddSmallInplace<B> + VecZnxBigNormalize<B> + VecZnxCopy + VecZnxRotateInplace<B> + VecZnxSub + VecZnxNegateInplace + VecZnxRshInplace<B> + VecZnxAddInplace + VecZnxNormalizeInplace<B> + VecZnxSubABInplace + VecZnxRotate + VecZnxAutomorphismInplace<B> + VecZnxBigSubSmallBInplace<B> + VecZnxBigAutomorphismInplace<B>, Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx,

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::scratch_space.

pub fn flush<Data: DataMut, B: Backend>( &mut self, module: &Module<B>, res: &mut GLWECiphertext<Data>, )

where Module<B>: VecZnxCopy,

Flush result tores.