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use crate::high_level_api::global_state::with_internal_keys;
use crate::high_level_api::keys::InternalServerKey;
use crate::high_level_api::re_randomization::ReRandomizationMetadata;
use crate::high_level_api::strings::ascii::FheAsciiString;
use crate::high_level_api::strings::traits::FheStringMatching;
use crate::strings::ciphertext::ClearString;
use crate::FheBool;
impl FheStringMatching<&Self> for FheAsciiString {
/// checks if the string contains the given substring
///
/// Returns a [FheBool] that encrypts `true` if the substring was found.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe is an fhe scheme", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("fhe", &client_key).unwrap();
/// let found = string.contains(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// ```
fn contains(&self, other: &Self) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.contains(&self.inner.on_cpu(), (&*other.inner.on_cpu()).into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings contains");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support contains");
}
})
}
/// checks if the string starts with the given substring
///
/// Returns a [FheBool] that encrypts `true` if the substring was found at the beginning.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe is an fhe scheme", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("fhe", &client_key).unwrap();
/// let found = string.starts_with(&pattern);
///
/// assert!(!found.decrypt(&client_key));
/// ```
fn starts_with(&self, other: &Self) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.starts_with(&self.inner.on_cpu(), (&*other.inner.on_cpu()).into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings starts_with");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support starts_with");
}
})
}
/// checks if the string ends with the given substring
///
/// Returns a [FheBool] that encrypts `true` if the substring was found at the end.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe is an fhe scheme", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("scheme", &client_key).unwrap();
/// let found = string.ends_with(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// ```
fn ends_with(&self, other: &Self) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.ends_with(&self.inner.on_cpu(), (&*other.inner.on_cpu()).into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings ends_with");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support ends_with");
}
})
}
}
impl FheStringMatching<&ClearString> for FheAsciiString {
fn contains(&self, other: &ClearString) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.contains(&self.inner.on_cpu(), other.into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings contains");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support contains");
}
})
}
fn starts_with(&self, other: &ClearString) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.starts_with(&self.inner.on_cpu(), other.into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings starts_with");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support starts_with");
}
})
}
fn ends_with(&self, other: &ClearString) -> FheBool {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let inner = cpu_key
.string_key()
.ends_with(&self.inner.on_cpu(), other.into());
FheBool::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strings ends_with");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support ends_with");
}
})
}
}