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use crate::integer::server_key::CheckError;
use crate::integer::{CrtCiphertext, ServerKey};
use rayon::prelude::*;
impl ServerKey {
/// Computes homomorphically an addition between a scalar and a ciphertext.
///
/// This function computes the operation without checking if it exceeds the capacity of the
/// ciphertext.
///
/// The result is returned as a new ciphertext.
///
/// # Example
///
///```rust
/// use tfhe::integer::gen_keys_crt;
/// use tfhe::shortint::parameters::PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128;
///
/// // Generate the client key and the server key:
/// let basis = vec![2, 3, 5];
/// let modulus: u64 = basis.iter().product();
/// let (cks, sks) = gen_keys_crt(PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128, basis);
///
/// let clear_1 = 14;
/// let clear_2 = 14;
/// // Encrypt two messages
/// let mut ctxt_1 = cks.encrypt(clear_1);
///
/// sks.unchecked_crt_scalar_add_assign_parallelized(&mut ctxt_1, clear_2);
///
/// // Decrypt
/// let res = cks.decrypt(&ctxt_1);
/// assert_eq!((clear_1 + clear_2) % modulus, res);
/// ```
pub fn unchecked_crt_scalar_add_parallelized(
&self,
ct: &CrtCiphertext,
scalar: u64,
) -> CrtCiphertext {
let mut result = ct.clone();
self.unchecked_crt_scalar_add_assign_parallelized(&mut result, scalar);
result
}
/// Computes homomorphically an addition between a scalar and a ciphertext.
///
/// This function computes the operation without checking if it exceeds the capacity of the
/// ciphertext.
///
/// The result is assigned to the `ct_left` ciphertext.
pub fn unchecked_crt_scalar_add_assign_parallelized(
&self,
ct: &mut CrtCiphertext,
scalar: u64,
) {
//Add the crt representation of the scalar to the ciphertext
ct.blocks
.par_iter_mut()
.zip(ct.moduli.par_iter())
.for_each(|(ct_i, mod_i)| {
let scalar_i = scalar % mod_i;
self.key.unchecked_scalar_add_assign(ct_i, scalar_i as u8);
});
}
/// Computes homomorphically an addition between a scalar and a ciphertext.
///
/// If the operation can be performed, the result is returned in a new ciphertext.
/// Otherwise a [CheckError] is returned.
///
/// # Example
///
/// ```rust
/// use tfhe::integer::gen_keys_crt;
/// use tfhe::shortint::parameters::PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128;
///
/// // Generate the client key and the server key:
/// let basis = vec![2, 3, 5];
/// let modulus: u64 = basis.iter().product();
/// let (cks, sks) = gen_keys_crt(PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128, basis);
///
/// let clear_1 = 14;
/// let clear_2 = 14;
/// // Encrypt two messages
/// let mut ctxt_1 = cks.encrypt(clear_1);
///
/// sks.checked_crt_scalar_add_assign_parallelized(&mut ctxt_1, clear_2)
/// .unwrap();
///
/// // Decrypt
/// let res = cks.decrypt(&ctxt_1);
/// assert_eq!((clear_1 + clear_2) % modulus, res);
/// ```
pub fn checked_crt_scalar_add_parallelized(
&self,
ct: &CrtCiphertext,
scalar: u64,
) -> Result<CrtCiphertext, CheckError> {
self.is_crt_scalar_add_possible(ct, scalar)?;
Ok(self.unchecked_crt_scalar_add_parallelized(ct, scalar))
}
/// Computes homomorphically an addition between a scalar and a ciphertext.
///
/// If the operation can be performed, the result is stored in the `ct_left` ciphertext.
/// Otherwise a [CheckError] is returned, and `ct_left` is not modified.
pub fn checked_crt_scalar_add_assign_parallelized(
&self,
ct: &mut CrtCiphertext,
scalar: u64,
) -> Result<(), CheckError> {
self.is_crt_scalar_add_possible(ct, scalar)?;
self.unchecked_crt_scalar_add_assign_parallelized(ct, scalar);
Ok(())
}
/// Computes homomorphically the addition of ciphertext with a scalar.
///
/// The result is returned in a new ciphertext.
///
/// # Example
///
///```rust
/// use tfhe::integer::gen_keys_crt;
/// use tfhe::shortint::parameters::PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128;
///
/// // Generate the client key and the server key:
/// let basis = vec![2, 3, 5];
/// let modulus: u64 = basis.iter().product();
/// let (cks, sks) = gen_keys_crt(PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128, basis);
///
/// let clear_1 = 14;
/// let clear_2 = 14;
/// // Encrypt two messages
/// let mut ctxt_1 = cks.encrypt(clear_1);
///
/// let ctxt = sks.smart_crt_scalar_add_parallelized(&mut ctxt_1, clear_2);
///
/// // Decrypt
/// let res = cks.decrypt(&ctxt);
/// assert_eq!((clear_1 + clear_2) % modulus, res);
/// ```
pub fn smart_crt_scalar_add_parallelized(
&self,
ct: &mut CrtCiphertext,
scalar: u64,
) -> CrtCiphertext {
if self.is_crt_scalar_add_possible(ct, scalar).is_err() {
self.full_extract_message_assign_parallelized(ct);
}
self.is_crt_scalar_add_possible(ct, scalar).unwrap();
let mut ct = ct.clone();
self.unchecked_crt_scalar_add_assign_parallelized(&mut ct, scalar);
ct
}
/// Computes homomorphically the addition of ciphertext with a scalar.
///
/// The result is assigned to the `ct_left` ciphertext.
///
/// # Example
///
///```rust
/// use tfhe::integer::gen_keys_crt;
/// use tfhe::shortint::parameters::PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128;
///
/// // Generate the client key and the server key:
/// let basis = vec![2, 3, 5];
/// let modulus: u64 = basis.iter().product();
/// let (cks, sks) = gen_keys_crt(PARAM_MESSAGE_3_CARRY_3_KS_PBS_GAUSSIAN_2M128, basis);
///
/// let clear_1 = 14;
/// let clear_2 = 14;
/// // Encrypt two messages
/// let mut ctxt_1 = cks.encrypt(clear_1);
///
/// sks.smart_crt_scalar_add_assign_parallelized(&mut ctxt_1, clear_2);
///
/// // Decrypt
/// let res = cks.decrypt(&ctxt_1);
/// assert_eq!((clear_1 + clear_2) % modulus, res);
/// ```
pub fn smart_crt_scalar_add_assign_parallelized(&self, ct: &mut CrtCiphertext, scalar: u64) {
if self.is_crt_scalar_add_possible(ct, scalar).is_err() {
self.full_extract_message_assign_parallelized(ct);
}
self.is_crt_scalar_add_possible(ct, scalar).unwrap();
self.unchecked_crt_scalar_add_assign_parallelized(ct, scalar);
}
}