poulpy/poulpy-core/src/automorphism/gglwe_atk.rs
poulpy-core/src/automorphism/gglwe_atk.rsRaw
1use poulpy_hal::{
2 api::{
3 ScratchAvailable, TakeVecZnx, TakeVecZnxDft, VecZnxAutomorphism, VecZnxAutomorphismInplace, VecZnxBigAddSmallInplace,
4 VecZnxBigNormalize, VecZnxBigNormalizeTmpBytes, VecZnxDftAllocBytes, VecZnxDftApply, VecZnxIdftApplyConsume,
5 VecZnxNormalize, VecZnxNormalizeTmpBytes, VmpApplyDftToDft, VmpApplyDftToDftAdd, VmpApplyDftToDftTmpBytes,
6 },
7 layouts::{Backend, DataMut, DataRef, Module, Scratch, ZnxZero},
8};
9
10use crate::layouts::{AutomorphismKey, GGLWEInfos, GLWE, prepared::AutomorphismKeyPrepared};
11
12impl AutomorphismKey<Vec<u8>> {
13 pub fn automorphism_scratch_space<B: Backend, OUT, IN, KEY>(
14 module: &Module<B>,
15 out_infos: &OUT,
16 in_infos: &IN,
17 key_infos: &KEY,
18 ) -> usize
19 where
20 OUT: GGLWEInfos,
21 IN: GGLWEInfos,
22 KEY: GGLWEInfos,
23 Module<B>: VecZnxDftAllocBytes + VmpApplyDftToDftTmpBytes + VecZnxBigNormalizeTmpBytes + VecZnxNormalizeTmpBytes,
24 {
25 GLWE::keyswitch_scratch_space(
26 module,
27 &out_infos.glwe_layout(),
28 &in_infos.glwe_layout(),
29 key_infos,
30 )
31 }
32
33 pub fn automorphism_inplace_scratch_space<B: Backend, OUT, KEY>(module: &Module<B>, out_infos: &OUT, key_infos: &KEY) -> usize
34 where
35 OUT: GGLWEInfos,
36 KEY: GGLWEInfos,
37 Module<B>: VecZnxDftAllocBytes + VmpApplyDftToDftTmpBytes + VecZnxBigNormalizeTmpBytes + VecZnxNormalizeTmpBytes,
38 {
39 AutomorphismKey::automorphism_scratch_space(module, out_infos, out_infos, key_infos)
40 }
41}
42
43impl<DataSelf: DataMut> AutomorphismKey<DataSelf> {
44 pub fn automorphism<DataLhs: DataRef, DataRhs: DataRef, B: Backend>(
45 &mut self,
46 module: &Module<B>,
47 lhs: &AutomorphismKey<DataLhs>,
48 rhs: &AutomorphismKeyPrepared<DataRhs, B>,
49 scratch: &mut Scratch<B>,
50 ) where
51 Module<B>: VecZnxDftAllocBytes
52 + VmpApplyDftToDftTmpBytes
53 + VecZnxBigNormalizeTmpBytes
54 + VmpApplyDftToDft<B>
55 + VmpApplyDftToDftAdd<B>
56 + VecZnxDftApply<B>
57 + VecZnxIdftApplyConsume<B>
58 + VecZnxBigAddSmallInplace<B>
59 + VecZnxBigNormalize<B>
60 + VecZnxAutomorphism
61 + VecZnxAutomorphismInplace<B>
62 + VecZnxNormalize<B>
63 + VecZnxNormalizeTmpBytes,
64 Scratch<B>: ScratchAvailable + TakeVecZnxDft<B> + TakeVecZnx,
65 {
66 #[cfg(debug_assertions)]
67 {
68 use crate::layouts::LWEInfos;
69
70 assert_eq!(
71 self.rank_in(),
72 lhs.rank_in(),
73 "ksk_out input rank: {} != ksk_in input rank: {}",
74 self.rank_in(),
75 lhs.rank_in()
76 );
77 assert_eq!(
78 self.rank_out(),
79 rhs.rank_in(),
80 "ksk_in output rank: {} != ksk_apply input rank: {}",
81 self.rank_out(),
82 rhs.rank_in()
83 );
84 assert_eq!(
85 self.rank_out(),
86 rhs.rank_out(),
87 "ksk_out output rank: {} != ksk_apply output rank: {}",
88 self.rank_out(),
89 rhs.rank_out()
90 );
91 assert!(
92 self.k() <= lhs.k(),
93 "output k={} cannot be greater than input k={}",
94 self.k(),
95 lhs.k()
96 )
97 }
98
99 let cols_out: usize = (rhs.rank_out() + 1).into();
100
101 let p: i64 = lhs.p();
102 let p_inv: i64 = module.galois_element_inv(p);
103
104 (0..self.rank_in().into()).for_each(|col_i| {
105 (0..self.dnum().into()).for_each(|row_j| {
106 let mut res_ct: GLWE<&mut [u8]> = self.at_mut(row_j, col_i);
107 let lhs_ct: GLWE<&[u8]> = lhs.at(row_j, col_i);
108
109 // Reverts the automorphism X^{-k}: (-pi^{-1}_{k}(s)a + s, a) to (-sa + pi_{k}(s), a)
110 (0..cols_out).for_each(|i| {
111 module.vec_znx_automorphism(lhs.p(), &mut res_ct.data, i, &lhs_ct.data, i);
112 });
113
114 // Key-switch (-sa + pi_{k}(s), a) to (-pi^{-1}_{k'}(s)a + pi_{k}(s), a)
115 res_ct.keyswitch_inplace(module, &rhs.key, scratch);
116
117 // Applies back the automorphism X^{-k}: (-pi^{-1}_{k'}(s)a + pi_{k}(s), a) to (-pi^{-1}_{k'+k}(s)a + s, a)
118 (0..cols_out).for_each(|i| {
119 module.vec_znx_automorphism_inplace(p_inv, &mut res_ct.data, i, scratch);
120 });
121 });
122 });
123
124 (self.dnum().min(lhs.dnum()).into()..self.dnum().into()).for_each(|row_i| {
125 (0..self.rank_in().into()).for_each(|col_j| {
126 self.at_mut(row_i, col_j).data.zero();
127 });
128 });
129
130 self.p = (lhs.p * rhs.p) % (module.cyclotomic_order() as i64);
131 }
132
133 pub fn automorphism_inplace<DataRhs: DataRef, B: Backend>(
134 &mut self,
135 module: &Module<B>,
136 rhs: &AutomorphismKeyPrepared<DataRhs, B>,
137 scratch: &mut Scratch<B>,
138 ) where
139 Module<B>: VecZnxDftAllocBytes
140 + VmpApplyDftToDftTmpBytes
141 + VecZnxBigNormalizeTmpBytes
142 + VmpApplyDftToDft<B>
143 + VmpApplyDftToDftAdd<B>
144 + VecZnxDftApply<B>
145 + VecZnxIdftApplyConsume<B>
146 + VecZnxBigAddSmallInplace<B>
147 + VecZnxBigNormalize<B>
148 + VecZnxAutomorphism
149 + VecZnxAutomorphismInplace<B>
150 + VecZnxNormalize<B>
151 + VecZnxNormalizeTmpBytes,
152 Scratch<B>: ScratchAvailable + TakeVecZnxDft<B> + TakeVecZnx,
153 {
154 #[cfg(debug_assertions)]
155 {
156 assert_eq!(
157 self.rank_out(),
158 rhs.rank_in(),
159 "ksk_in output rank: {} != ksk_apply input rank: {}",
160 self.rank_out(),
161 rhs.rank_in()
162 );
163 assert_eq!(
164 self.rank_out(),
165 rhs.rank_out(),
166 "ksk_out output rank: {} != ksk_apply output rank: {}",
167 self.rank_out(),
168 rhs.rank_out()
169 );
170 }
171
172 let cols_out: usize = (rhs.rank_out() + 1).into();
173
174 let p: i64 = self.p();
175 let p_inv = module.galois_element_inv(p);
176
177 (0..self.rank_in().into()).for_each(|col_i| {
178 (0..self.dnum().into()).for_each(|row_j| {
179 let mut res_ct: GLWE<&mut [u8]> = self.at_mut(row_j, col_i);
180
181 // Reverts the automorphism X^{-k}: (-pi^{-1}_{k}(s)a + s, a) to (-sa + pi_{k}(s), a)
182 (0..cols_out).for_each(|i| {
183 module.vec_znx_automorphism_inplace(p_inv, &mut res_ct.data, i, scratch);
184 });
185
186 // Key-switch (-sa + pi_{k}(s), a) to (-pi^{-1}_{k'}(s)a + pi_{k}(s), a)
187 res_ct.keyswitch_inplace(module, &rhs.key, scratch);
188
189 // Applies back the automorphism X^{-k}: (-pi^{-1}_{k'}(s)a + pi_{k}(s), a) to (-pi^{-1}_{k'+k}(s)a + s, a)
190 (0..cols_out).for_each(|i| {
191 module.vec_znx_automorphism_inplace(p_inv, &mut res_ct.data, i, scratch);
192 });
193 });
194 });
195
196 self.p = (self.p * rhs.p) % (module.cyclotomic_order() as i64);
197 }
198}