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use concrete_commons::dispersion::Variance;
use crate::backends::core::implementation::engines::CoreEngine;
use crate::backends::core::implementation::entities::{
LweCiphertext32, LweCiphertext64, LweSecretKey32, LweSecretKey64, Plaintext32, Plaintext64,
};
use crate::backends::core::private::crypto::lwe::LweCiphertext as ImplLweCiphertext;
use crate::specification::engines::{LweCiphertextEncryptionEngine, LweCiphertextEncryptionError};
use crate::specification::entities::LweSecretKeyEntity;
/// # Description:
/// Implementation of [`LweCiphertextEncryptionEngine`] for [`CoreEngine`] that operates on
/// 32 bits integers.
impl LweCiphertextEncryptionEngine<LweSecretKey32, Plaintext32, LweCiphertext32> for CoreEngine {
/// # Example:
/// ```
/// use concrete_commons::dispersion::Variance;
/// use concrete_commons::parameters::LweDimension;
/// use concrete_core::prelude::*;
/// # use std::error::Error;
///
/// # fn main() -> Result<(), Box<dyn Error>> {
/// // DISCLAIMER: the parameters used here are only for test purpose, and are not secure.
/// let lwe_dimension = LweDimension(2);
/// // Here a hard-set encoding is applied (shift by 20 bits)
/// let input = 3_u32 << 20;
/// let noise = Variance(2_f64.powf(-25.));
///
/// let mut engine = CoreEngine::new()?;
/// let key: LweSecretKey32 = engine.create_lwe_secret_key(lwe_dimension)?;
/// let plaintext = engine.create_plaintext(&input)?;
///
/// let ciphertext = engine.encrypt_lwe_ciphertext(&key, &plaintext, noise)?;
/// #
/// assert_eq!(ciphertext.lwe_dimension(), lwe_dimension);
///
/// engine.destroy(key)?;
/// engine.destroy(plaintext)?;
/// engine.destroy(ciphertext)?;
/// #
/// # Ok(())
/// # }
/// ```
fn encrypt_lwe_ciphertext(
&mut self,
key: &LweSecretKey32,
input: &Plaintext32,
noise: Variance,
) -> Result<LweCiphertext32, LweCiphertextEncryptionError<Self::EngineError>> {
Ok(unsafe { self.encrypt_lwe_ciphertext_unchecked(key, input, noise) })
}
unsafe fn encrypt_lwe_ciphertext_unchecked(
&mut self,
key: &LweSecretKey32,
input: &Plaintext32,
noise: Variance,
) -> LweCiphertext32 {
let mut ciphertext = ImplLweCiphertext::allocate(0u32, key.lwe_dimension().to_lwe_size());
key.0.encrypt_lwe(
&mut ciphertext,
&input.0,
noise,
&mut self.encryption_generator,
);
LweCiphertext32(ciphertext)
}
}
/// # Description:
/// Implementation of [`LweCiphertextEncryptionEngine`] for [`CoreEngine`] that operates on
/// 64 bits integers.
impl LweCiphertextEncryptionEngine<LweSecretKey64, Plaintext64, LweCiphertext64> for CoreEngine {
/// # Example:
/// ```
/// use concrete_commons::dispersion::Variance;
/// use concrete_commons::parameters::LweDimension;
/// use concrete_core::prelude::*;
/// # use std::error::Error;
///
/// # fn main() -> Result<(), Box<dyn Error>> {
/// // DISCLAIMER: the parameters used here are only for test purpose, and are not secure.
/// let lwe_dimension = LweDimension(2);
/// // Here a hard-set encoding is applied (shift by 50 bits)
/// let input = 3_u64 << 50;
/// let noise = Variance(2_f64.powf(-25.));
///
/// let mut engine = CoreEngine::new()?;
/// let key: LweSecretKey64 = engine.create_lwe_secret_key(lwe_dimension)?;
/// let plaintext = engine.create_plaintext(&input)?;
///
/// let ciphertext = engine.encrypt_lwe_ciphertext(&key, &plaintext, noise)?;
/// #
/// assert_eq!(ciphertext.lwe_dimension(), lwe_dimension);
///
/// engine.destroy(key)?;
/// engine.destroy(plaintext)?;
/// engine.destroy(ciphertext)?;
/// #
/// # Ok(())
/// # }
/// ```
fn encrypt_lwe_ciphertext(
&mut self,
key: &LweSecretKey64,
input: &Plaintext64,
noise: Variance,
) -> Result<LweCiphertext64, LweCiphertextEncryptionError<Self::EngineError>> {
Ok(unsafe { self.encrypt_lwe_ciphertext_unchecked(key, input, noise) })
}
unsafe fn encrypt_lwe_ciphertext_unchecked(
&mut self,
key: &LweSecretKey64,
input: &Plaintext64,
noise: Variance,
) -> LweCiphertext64 {
let mut ciphertext = ImplLweCiphertext::allocate(0u64, key.lwe_dimension().to_lwe_size());
key.0.encrypt_lwe(
&mut ciphertext,
&input.0,
noise,
&mut self.encryption_generator,
);
LweCiphertext64(ciphertext)
}
}