/
dyn_digest.rs
64 lines (50 loc) · 1.66 KB
/
dyn_digest.rs
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#![cfg(feature = "alloc")]
use alloc::boxed::Box;
use super::{FixedOutput, Reset, Update};
use generic_array::typenum::Unsigned;
/// The `DynDigest` trait is a modification of `Digest` trait suitable
/// for trait objects.
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait DynDigest {
/// Digest input data.
///
/// This method can be called repeatedly for use with streaming messages.
fn update(&mut self, data: &[u8]);
/// Retrieve result and reset hasher instance
fn finalize_reset(&mut self) -> Box<[u8]>;
/// Retrieve result and consume boxed hasher instance
fn finalize(self: Box<Self>) -> Box<[u8]>;
/// Reset hasher instance to its initial state.
fn reset(&mut self);
/// Get output size of the hasher
fn output_size(&self) -> usize;
/// Clone hasher state into a boxed trait object
fn box_clone(&self) -> Box<dyn DynDigest>;
}
impl<D: Update + FixedOutput + Reset + Clone + 'static> DynDigest for D {
fn update(&mut self, data: &[u8]) {
Update::update(self, data);
}
fn finalize_reset(&mut self) -> Box<[u8]> {
let res = self.finalize_fixed_reset().to_vec().into_boxed_slice();
Reset::reset(self);
res
}
fn finalize(self: Box<Self>) -> Box<[u8]> {
self.finalize_fixed().to_vec().into_boxed_slice()
}
fn reset(&mut self) {
Reset::reset(self);
}
fn output_size(&self) -> usize {
<Self as FixedOutput>::OutputSize::to_usize()
}
fn box_clone(&self) -> Box<dyn DynDigest> {
Box::new(self.clone())
}
}
impl Clone for Box<dyn DynDigest> {
fn clone(&self) -> Self {
self.box_clone()
}
}