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added test for automorphism on automorphism key

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This commit is contained in:
Jean-Philippe Bossuat
2025-05-19 14:05:20 +02:00
parent 13e26c8152
commit b9cc210793
7 changed files with 161 additions and 20 deletions
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8
base2k/src/module.rs
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@@ -74,15 +74,15 @@ impl<B: Backend> Module<B> {
}
// Returns gen^-1
pub fn galois_element_inv(&self, generator: i64) -> i64 {
if generator == 0 {
pub fn galois_element_inv(&self, gal_el: i64) -> i64 {
if gal_el == 0 {
panic!("cannot invert 0")
}
((mod_exp_u64(
generator.abs() as u64,
gal_el.abs() as u64,
(self.cyclotomic_order() - 1) as usize,
) & (self.cyclotomic_order() - 1)) as i64)
* generator.signum()
* gal_el.signum()
}
}