updated repo for publishing (#74)

poulpy-core/src/keyswitching/lwe_ct.rs

@@ -0,0 +1,87 @@
+use poulpy_backend::hal::{
+    api::{
+        ScratchAvailable, TakeVecZnx, 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::LWESwitchingKeyPrepared},
+};
+
+impl LWECiphertext<Vec<u8>> {
+    pub fn keyswitch_scratch_space<B: Backend>(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k_lwe_out: usize,
+        k_lwe_in: usize,
+        k_ksk: usize,
+    ) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes
+            + VmpApplyTmpBytes
+            + VecZnxBigNormalizeTmpBytes
+            + VmpApplyTmpBytes
+            + VmpApply<B>
+            + VmpApplyAdd<B>
+            + VecZnxDftFromVecZnx<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxBigAddSmallInplace<B>
+            + VecZnxBigNormalize<B>,
+    {
+        GLWECiphertext::bytes_of(n, basek, k_lwe_out.max(k_lwe_in), 1)
+            + GLWECiphertext::keyswitch_inplace_scratch_space(module, n, basek, k_lwe_out, k_ksk, 1, 1)
+    }
+}
+
+impl<DLwe: DataMut> LWECiphertext<DLwe> {
+    pub fn keyswitch<A, DKs, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        a: &LWECiphertext<A>,
+        ksk: &LWESwitchingKeyPrepared<DKs, B>,
+        scratch: &mut Scratch<B>,
+    ) where
+        A: DataRef,
+        DKs: DataRef,
+        Module<B>: VecZnxDftAllocBytes
+            + VmpApplyTmpBytes
+            + VecZnxBigNormalizeTmpBytes
+            + VmpApply<B>
+            + VmpApplyAdd<B>
+            + VecZnxDftFromVecZnx<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxBigAddSmallInplace<B>
+            + VecZnxBigNormalize<B>,
+        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert!(self.n() <= module.n());
+            assert!(a.n() <= module.n());
+            assert_eq!(self.basek(), a.basek());
+        }
+
+        let max_k: usize = self.k().max(a.k());
+        let basek: usize = self.basek();
+
+        let (mut glwe, scratch1) = scratch.take_glwe_ct(ksk.n(), basek, max_k, 1);
+        glwe.data.zero();
+
+        let n_lwe: usize = a.n();
+
+        (0..a.size()).for_each(|i| {
+            let data_lwe: &[i64] = a.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..]);
+        });
+
+        glwe.keyswitch_inplace(module, &ksk.0, scratch1);
+
+        self.sample_extract(&glwe);
+    }
+}