updated repo for publishing (#74)

poulpy-core/src/conversion/lwe_to_glwe.rs

@@ -0,0 +1,73 @@
+use poulpy_backend::hal::{
+    api::{
+        ScratchAvailable, TakeVecZnxDft, VecZnxBigAddSmallInplace, VecZnxBigNormalize, VecZnxBigNormalizeTmpBytes,
+        VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume, VmpApply, VmpApplyAdd, VmpApplyTmpBytes, ZnxView,
+        ZnxViewMut, ZnxZero,
+    },
+    layouts::{Backend, DataMut, DataRef, Module, Scratch},
+};
+
+use crate::{
+    TakeGLWECt,
+    layouts::{GLWECiphertext, Infos, LWECiphertext, prepared::LWEToGLWESwitchingKeyPrepared},
+};
+
+impl GLWECiphertext<Vec<u8>> {
+    pub fn from_lwe_scratch_space<B: Backend>(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k_lwe: usize,
+        k_glwe: usize,
+        k_ksk: usize,
+        rank: usize,
+    ) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes + VmpApplyTmpBytes + VecZnxBigNormalizeTmpBytes,
+    {
+        GLWECiphertext::keyswitch_scratch_space(module, n, basek, k_glwe, k_lwe, k_ksk, 1, 1, rank)
+            + GLWECiphertext::bytes_of(n, basek, k_lwe, 1)
+    }
+}
+
+impl<D: DataMut> GLWECiphertext<D> {
+    pub fn from_lwe<DLwe, DKsk, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        lwe: &LWECiphertext<DLwe>,
+        ksk: &LWEToGLWESwitchingKeyPrepared<DKsk, B>,
+        scratch: &mut Scratch<B>,
+    ) where
+        DLwe: DataRef,
+        DKsk: DataRef,
+        Module<B>: VecZnxDftAllocBytes
+            + VmpApplyTmpBytes
+            + VecZnxBigNormalizeTmpBytes
+            + VmpApply<B>
+            + VmpApplyAdd<B>
+            + VecZnxDftFromVecZnx<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxBigAddSmallInplace<B>
+            + VecZnxBigNormalize<B>,
+        Scratch<B>: ScratchAvailable + TakeVecZnxDft<B> + TakeGLWECt,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert!(lwe.n() <= self.n());
+            assert_eq!(self.basek(), self.basek());
+        }
+
+        let (mut glwe, scratch1) = scratch.take_glwe_ct(ksk.n(), lwe.basek(), lwe.k(), 1);
+        glwe.data.zero();
+
+        let n_lwe: usize = lwe.n();
+
+        (0..lwe.size()).for_each(|i| {
+            let data_lwe: &[i64] = lwe.data.at(0, i);
+            glwe.data.at_mut(0, i)[0] = data_lwe[0];
+            glwe.data.at_mut(1, i)[..n_lwe].copy_from_slice(&data_lwe[1..]);
+        });
+
+        self.keyswitch(module, &glwe, &ksk.0, scratch1);
+    }
+}