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use super::engine_error;
use crate::prelude::Variance;
use crate::specification::engines::AbstractEngine;
use crate::specification::entities::{GlweCiphertextEntity, GlweSecretKeyEntity};
engine_error! {
GlweCiphertextZeroEncryptionError for GlweCiphertextZeroEncryptionEngine @
}
/// A trait for engines encrypting zeros in GLWE ciphertexts.
///
/// # Semantics
///
/// This [pure](super#operation-semantics) operation generates a GLWE ciphertext containing an
/// encryption of zeros, under the `key` secret key.
///
/// # Formal Definition
///
/// This generates a [`GLWE
/// encryption`](`crate::specification::engines::GlweCiphertextEncryptionEngine`) of zero.
pub trait GlweCiphertextZeroEncryptionEngine<SecretKey, Ciphertext>: AbstractEngine
where
SecretKey: GlweSecretKeyEntity,
Ciphertext: GlweCiphertextEntity,
{
/// Encrypts a zero in a GLWE ciphertext.
fn zero_encrypt_glwe_ciphertext(
&mut self,
key: &SecretKey,
noise: Variance,
) -> Result<Ciphertext, GlweCiphertextZeroEncryptionError<Self::EngineError>>;
/// Unsafely encrypts a zero in a GLWE ciphertext.
///
/// # Safety
/// For the _general_ safety concerns regarding this operation, refer to the different variants
/// of [`GlweCiphertextZeroEncryptionError`]. For safety concerns _specific_ to an engine, refer
/// to the implementer safety section.
unsafe fn zero_encrypt_glwe_ciphertext_unchecked(
&mut self,
key: &SecretKey,
noise: Variance,
) -> Ciphertext;
}