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skip computing the higher order of secret key in BFV decryption #237

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Jan 15, 2024
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skip computing the higher order of secret key in BFV decryption #237

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6 changes: 5 additions & 1 deletion crates/fhe/src/bfv/keys/secret_key.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -175,12 +175,16 @@ impl FheDecrypter<Plaintext, Ciphertext> for SecretKey {
let mut c = Zeroizing::new(ct.c[0].clone());
c.disallow_variable_time_computations();

// Compute the phase c0 + c1*s + c2*s^2 + ... where the secret power
// s^k is computed on-the-fly
for i in 1..ct.c.len() {
let mut cis = Zeroizing::new(ct.c[i].clone());
cis.disallow_variable_time_computations();
*cis.as_mut() *= si.as_ref();
*c.as_mut() += &cis;
*si.as_mut() *= s.as_ref();
if i + 1 < ct.c.len() {
*si.as_mut() *= s.as_ref();
}
}
c.change_representation(Representation::PowerBasis);

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