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//! Bootstrapping key use fftw::array::AlignedVec; use serde::{Deserialize, Serialize}; use crate::crypto::encoding::Plaintext; use crate::crypto::{LweDimension, UnsignedTorus}; use crate::math::decomposition::{DecompositionBaseLog, DecompositionLevelCount}; use crate::math::dispersion::DispersionParameter; use crate::math::fft::{Complex64, Fft, FourierPolynomial}; use crate::math::polynomial::{Polynomial, PolynomialSize}; use crate::math::tensor::{AsMutTensor, AsRefSlice, AsRefTensor, Tensor}; use crate::numeric::Numeric; use crate::{ck_dim_div, ck_dim_eq, tensor_traits}; use super::ggsw::GgswCiphertext; use super::secret::{GlweSecretKey, LweSecretKey}; use super::GlweSize; /// A bootstrapping key #[derive(Debug, Clone, Deserialize, Serialize, PartialEq)] pub struct BootstrapKey<Cont> { tensor: Tensor<Cont>, poly_size: PolynomialSize, rlwe_size: GlweSize, decomp_level: DecompositionLevelCount, decomp_base_log: DecompositionBaseLog, } tensor_traits!(BootstrapKey); impl<Scalar> BootstrapKey<Vec<Scalar>> { /// Allocates a new bootstrapping key whose polynomials coefficients are all `value`. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.polynomial_size(), PolynomialSize(9)); /// assert_eq!(bsk.glwe_size(), GlweSize(7)); /// assert_eq!(bsk.level_count(), DecompositionLevelCount(3)); /// assert_eq!(bsk.base_log(), DecompositionBaseLog(5)); /// assert_eq!(bsk.key_size(), LweDimension(4)); /// ``` pub fn allocate( value: Scalar, rlwe_size: GlweSize, poly_size: PolynomialSize, decomp_level: DecompositionLevelCount, decomp_base_log: DecompositionBaseLog, key_size: LweDimension, ) -> BootstrapKey<Vec<Scalar>> where Scalar: Copy, { BootstrapKey { tensor: Tensor::from_container(vec![ value; key_size.0 * decomp_level.0 * rlwe_size.0 * rlwe_size.0 * poly_size.0 ]), decomp_level, decomp_base_log, rlwe_size, poly_size, } } } impl BootstrapKey<AlignedVec<Complex64>> { /// Allocates a new complex bootstrapping key whose polynomials coefficients are all `value`. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// let bsk = BootstrapKey::allocate( /// Complex64::new(9.,8.), /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.polynomial_size(), PolynomialSize(9)); /// assert_eq!(bsk.glwe_size(), GlweSize(7)); /// assert_eq!(bsk.level_count(), DecompositionLevelCount(3)); /// assert_eq!(bsk.base_log(), DecompositionBaseLog(5)); /// assert_eq!(bsk.key_size(), LweDimension(4)); /// ``` pub fn allocate_complex( value: Complex64, rlwe_size: GlweSize, poly_size: PolynomialSize, decomp_level: DecompositionLevelCount, decomp_base_log: DecompositionBaseLog, key_size: LweDimension, ) -> Self { let mut tensor = Tensor::from_container(AlignedVec::new( key_size.0 * decomp_level.0 * rlwe_size.0 * rlwe_size.0 * poly_size.0, )); tensor.as_mut_tensor().fill_with_element(value); BootstrapKey { tensor, decomp_level, decomp_base_log, rlwe_size, poly_size, } } } impl<Cont> BootstrapKey<Cont> { /// Creates a bootstrapping key from an existing container of values. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweDimension}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// let vector = vec![0u32; 10*5*4*4*15]; /// let bsk = BootstrapKey::from_container( /// vector.as_slice(), /// GlweSize(4), /// PolynomialSize(10), /// DecompositionLevelCount(5), /// DecompositionBaseLog(4) /// ); /// assert_eq!(bsk.polynomial_size(), PolynomialSize(10)); /// assert_eq!(bsk.glwe_size(), GlweSize(4)); /// assert_eq!(bsk.level_count(), DecompositionLevelCount(5)); /// assert_eq!(bsk.base_log(), DecompositionBaseLog(4)); /// assert_eq!(bsk.key_size(), LweDimension(15)); /// ``` pub fn from_container( cont: Cont, glwe_size: GlweSize, poly_size: PolynomialSize, decomp_level: DecompositionLevelCount, decomp_base_log: DecompositionBaseLog, ) -> BootstrapKey<Cont> where Cont: AsRefSlice, { let tensor = Tensor::from_container(cont); ck_dim_div!(tensor.len() => decomp_level.0, glwe_size.0 * glwe_size.0, poly_size.0 ); BootstrapKey { tensor, rlwe_size: glwe_size, poly_size, decomp_level, decomp_base_log, } } /// Returns the size of the polynomials used in the bootstrapping key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.polynomial_size(), PolynomialSize(9)); /// ``` pub fn polynomial_size(&self) -> PolynomialSize { self.poly_size } /// Returns the size of the GLWE ciphertexts used in the bootstrapping key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.glwe_size(), GlweSize(7)); /// ``` pub fn glwe_size(&self) -> GlweSize { self.rlwe_size } /// Returns the number of levels used to decompose the key bits. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.level_count(), DecompositionLevelCount(3)); /// ``` pub fn level_count(&self) -> DecompositionLevelCount { self.decomp_level } /// Returns the logarithm of the base used to decompose the key bits. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.base_log(), DecompositionBaseLog(5)); /// ``` pub fn base_log(&self) -> DecompositionBaseLog { self.decomp_base_log } /// Returns the size of the LWE encrypted key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// assert_eq!(bsk.key_size(), LweDimension(4)); /// ``` pub fn key_size(&self) -> LweDimension where Self: AsRefTensor, { ck_dim_div!(self.as_tensor().len() => self.poly_size.0, self.rlwe_size.0 * self.rlwe_size.0, self.decomp_level.0 ); LweDimension( self.as_tensor().len() / (self.rlwe_size.0 * self.rlwe_size.0 * self.poly_size.0 * self.decomp_level.0), ) } /// Generate a new bootstrap key from the input parameters, and fills the current container /// with it. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension, GlweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::crypto::secret::{LweSecretKey, GlweSecretKey}; /// use concrete_core::math::dispersion::LogStandardDev; /// let (lwe_dim, glwe_dim, poly_size) = (LweDimension(4), GlweDimension(6), PolynomialSize(9)); /// let (dec_lc, dec_bl) = (DecompositionLevelCount(3), DecompositionBaseLog(5)); /// let mut bsk = BootstrapKey::allocate( /// 9u32, /// glwe_dim.to_glwe_size(), /// poly_size, /// dec_lc, /// dec_bl, /// lwe_dim /// ); /// let lwe_sk = LweSecretKey::generate(lwe_dim); /// let glwe_sk = GlweSecretKey::generate(glwe_dim, poly_size); /// bsk.fill_with_new_key(&lwe_sk, &glwe_sk, LogStandardDev::from_log_standard_dev(-15.)); /// ``` pub fn fill_with_new_key<LweCont, RlweCont, Scalar>( &mut self, lwe_secret_key: &LweSecretKey<LweCont>, glwe_secret_key: &GlweSecretKey<RlweCont>, noise_parameters: impl DispersionParameter, ) where Self: AsMutTensor<Element = Scalar>, LweSecretKey<LweCont>: AsRefTensor<Element = bool>, GlweSecretKey<RlweCont>: AsRefTensor<Element = bool>, Scalar: UnsignedTorus, { ck_dim_eq!(self.key_size().0 => lwe_secret_key.key_size().0); self.as_mut_tensor() .fill_with_element(<Scalar as Numeric>::ZERO); for (mut rgsw, sk_scalar) in self.ggsw_iter_mut().zip(lwe_secret_key.as_tensor().iter()) { let encoded = if *sk_scalar { Plaintext(Scalar::ONE) } else { Plaintext(Scalar::ZERO) }; glwe_secret_key.encrypt_constant_ggsw(&mut rgsw, &encoded, noise_parameters.clone()); } } /// Generate a new bootstrap key from the input parameters, and fills the current container /// with it. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension, GlweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::crypto::secret::{LweSecretKey, GlweSecretKey}; /// use concrete_core::math::dispersion::LogStandardDev; /// let (lwe_dim, glwe_dim, poly_size) = (LweDimension(4), GlweDimension(6), PolynomialSize(9)); /// let (dec_lc, dec_bl) = (DecompositionLevelCount(3), DecompositionBaseLog(5)); /// let mut bsk = BootstrapKey::allocate( /// 9u32, /// glwe_dim.to_glwe_size(), /// poly_size, /// dec_lc, /// dec_bl, /// lwe_dim /// ); /// let lwe_sk = LweSecretKey::generate(lwe_dim); /// let glwe_sk = GlweSecretKey::generate(glwe_dim, poly_size); /// bsk.fill_with_new_trivial_key( /// &lwe_sk, /// &glwe_sk, /// LogStandardDev::from_log_standard_dev(-15.) /// ); /// ``` pub fn fill_with_new_trivial_key<LweCont, RlweCont, Scalar>( &mut self, lwe_secret_key: &LweSecretKey<LweCont>, rlwe_secret_key: &GlweSecretKey<RlweCont>, noise_parameters: impl DispersionParameter, ) where Self: AsMutTensor<Element = Scalar>, LweSecretKey<LweCont>: AsRefTensor<Element = bool>, GlweSecretKey<RlweCont>: AsRefTensor<Element = bool>, Scalar: UnsignedTorus, { ck_dim_eq!(self.key_size().0 => lwe_secret_key.key_size().0); for (mut rgsw, sk_scalar) in self.ggsw_iter_mut().zip(lwe_secret_key.as_tensor().iter()) { let encoded = if *sk_scalar { Plaintext(Scalar::ONE) } else { Plaintext(Scalar::ZERO) }; rlwe_secret_key.trivial_encrypt_constant_ggsw( &mut rgsw, &encoded, noise_parameters.clone(), ); } } /// Returns an iterator over the borrowed GGSW ciphertext composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for ggsw in bsk.ggsw_iter(){ /// assert_eq!(ggsw.polynomial_size(), PolynomialSize(9)); /// assert_eq!(ggsw.glwe_size(), GlweSize(7)); /// assert_eq!(ggsw.decomposition_level_count(), DecompositionLevelCount(3)); /// } /// assert_eq!(bsk.ggsw_iter().count(), 4); /// ``` pub fn ggsw_iter( &self, ) -> impl Iterator<Item = GgswCiphertext<&[<Self as AsRefTensor>::Element]>> where Self: AsRefTensor, { let chunks_size = self.rlwe_size.0 * self.rlwe_size.0 * self.poly_size.0 * self.decomp_level.0; let rlwe_size = self.rlwe_size; let poly_size = self.poly_size; let base_log = self.decomp_base_log; self.as_tensor() .subtensor_iter(chunks_size) .map(move |tensor| { GgswCiphertext::from_container( tensor.into_container(), rlwe_size, poly_size, base_log, ) }) } /// Returns an iterator over the mutably borrowed GGSW ciphertext composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::tensor::{AsMutTensor, AsRefTensor}; /// let mut bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(9), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for mut ggsw in bsk.ggsw_iter_mut(){ /// ggsw.as_mut_tensor().fill_with_element(0); /// } /// assert!(bsk.as_tensor().iter().all(|a| *a==0)); /// assert_eq!(bsk.ggsw_iter_mut().count(), 4); /// ``` pub fn ggsw_iter_mut( &mut self, ) -> impl Iterator<Item = GgswCiphertext<&mut [<Self as AsRefTensor>::Element]>> where Self: AsMutTensor, { let chunks_size = self.rlwe_size.0 * self.rlwe_size.0 * self.poly_size.0 * self.decomp_level.0; let rlwe_size = self.rlwe_size; let poly_size = self.poly_size; let base_log = self.decomp_base_log; self.as_mut_tensor() .subtensor_iter_mut(chunks_size) .map(move |tensor| { GgswCiphertext::from_container( tensor.into_container(), rlwe_size, poly_size, base_log, ) }) } /// Fills a complex bootstrapping key with the fourier transform of a bootstrapping key in /// coefficient domain. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// let mut frr_bsk = BootstrapKey::allocate_complex( /// Complex64::new(0.,0.), /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// frr_bsk.fill_with_forward_fourier(&bsk); /// ``` pub fn fill_with_forward_fourier<InputCont, Scalar>( &mut self, coef_bsk: &BootstrapKey<InputCont>, ) where Self: AsMutTensor<Element = Complex64>, BootstrapKey<InputCont>: AsRefTensor<Element = Scalar>, Scalar: UnsignedTorus, { // We create an fft transformer let mut fft = Fft::new(self.poly_size); // We create an aligned buffer let mut fft_buffer = FourierPolynomial::allocate(Complex64::new(0., 0.), self.poly_size); // We transform every polynomial into for (mut fourier_poly, coef_poly) in self.fourier_poly_iter_mut().zip(coef_bsk.poly_iter()) { fft.forward_as_torus(&mut fft_buffer, &coef_poly); fourier_poly .as_mut_tensor() .fill_with_one(fft_buffer.as_tensor(), |a| *a); } } /// For a complex bootstrapping key, returns an iterator over borrowed complex /// polynomials composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// let frr_bsk = BootstrapKey::allocate_complex( /// Complex64::new(0.,0.), /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for poly in frr_bsk.fourier_poly_iter(){ /// assert_eq!(poly.polynomial_size(), PolynomialSize(256)); /// } /// assert_eq!(frr_bsk.fourier_poly_iter().count(), 7*7*3*4) /// ``` pub fn fourier_poly_iter(&self) -> impl Iterator<Item = FourierPolynomial<&[Complex64]>> where Self: AsRefTensor<Element = Complex64>, { self.as_tensor() .subtensor_iter(self.poly_size.0) .map(|chunk| FourierPolynomial::from_container(chunk.into_container())) } /// For a complex bootstrapping key, returns an iterator over mutably borrowed complex /// polynomials composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// use concrete_core::math::tensor::{AsMutTensor, AsRefTensor}; /// let mut frr_bsk = BootstrapKey::allocate_complex( /// Complex64::new(0.,0.), /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for mut poly in frr_bsk.fourier_poly_iter_mut(){ /// poly.as_mut_tensor().fill_with_element(Complex64::new(5.,5.)); /// } /// assert!(frr_bsk.as_tensor().iter().all(|a| *a==Complex64::new(5.,5.))); /// assert_eq!(frr_bsk.fourier_poly_iter_mut().count(), 7*7*3*4) /// ``` pub fn fourier_poly_iter_mut( &mut self, ) -> impl Iterator<Item = FourierPolynomial<&mut [Complex64]>> where Self: AsMutTensor<Element = Complex64>, { let poly_size = self.poly_size.0; self.as_mut_tensor() .subtensor_iter_mut(poly_size) .map(|chunk| FourierPolynomial::from_container(chunk.into_container())) } /// Returns an iterator over borrowed polynomials composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// use concrete_core::math::tensor::{AsMutTensor, AsRefTensor}; /// let bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for poly in bsk.poly_iter(){ /// assert_eq!(poly.polynomial_size(), PolynomialSize(256)); /// } /// assert_eq!(bsk.poly_iter().count(), 7*7*3*4) /// ``` pub fn poly_iter<'a, Coef>(&'a self) -> impl Iterator<Item = Polynomial<&[Coef]>> where Self: AsRefTensor<Element = Coef>, Coef: UnsignedTorus + 'a, { let poly_size = self.poly_size.0; self.as_tensor() .subtensor_iter(poly_size) .map(|chunk| Polynomial::from_container(chunk.into_container())) } /// Returns an iterator over mutably borrowed polynomials composing the key. /// /// # Example /// /// ``` /// use concrete_core::crypto::bootstrap::BootstrapKey; /// use concrete_core::crypto::{GlweSize, LweSize, LweDimension}; /// use concrete_core::math::decomposition::{DecompositionLevelCount, DecompositionBaseLog}; /// use concrete_core::math::polynomial::PolynomialSize; /// use concrete_core::math::fft::Complex64; /// use concrete_core::math::tensor::{AsMutTensor, AsRefTensor}; /// let mut bsk = BootstrapKey::allocate( /// 9u32, /// GlweSize(7), /// PolynomialSize(256), /// DecompositionLevelCount(3), /// DecompositionBaseLog(5), /// LweDimension(4) /// ); /// for mut poly in bsk.poly_iter_mut(){ /// poly.as_mut_tensor().fill_with_element(0u32); /// } /// assert!(bsk.as_tensor().iter().all(|a| *a==0)); /// assert_eq!(bsk.poly_iter_mut().count(), 7*7*3*4) /// ``` pub fn poly_iter_mut<'a, Coef>(&'a mut self) -> impl Iterator<Item = Polynomial<&mut [Coef]>> where Self: AsMutTensor<Element = Coef>, Coef: UnsignedTorus + 'a, { let poly_size = self.poly_size.0; self.as_mut_tensor() .subtensor_iter_mut(poly_size) .map(|chunk| Polynomial::from_container(chunk.into_container())) } }