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#![cfg(feature = "std")]
use std::boxed::Box;
use super::{Input, FixedOutput, Reset};
use generic_array::typenum::Unsigned;
/// The `DynDigest` trait is a modification of `Digest` trait suitable
/// for trait objects.
pub trait DynDigest {
/// Digest input data.
///
/// This method can be called repeatedly for use with streaming messages.
fn input(&mut self, data: &[u8]);
/// Retrieve result and reset hasher instance
fn result_reset(&mut self) -> Box<[u8]>;
/// Retrieve result and consume boxed hasher instance
fn result(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<DynDigest>;
}
impl<D: Input + FixedOutput + Reset + Clone + 'static> DynDigest for D {
fn input(&mut self, data: &[u8]) {
Input::input(self, data);
}
fn result_reset(&mut self) -> Box<[u8]> {
let res = self.clone().fixed_result().to_vec().into_boxed_slice();
Reset::reset(self);
res
}
fn result(self: Box<Self>) -> Box<[u8]> {
self.fixed_result().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<DynDigest> {
Box::new(self.clone())
}
}
impl Clone for Box<DynDigest> {
fn clone(&self) -> Self {
self.box_clone()
}
}
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