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use alloc::boxed::Box;
use core::fmt;
use super::{FixedOutput, Reset, Update};
use generic_array::{typenum::Unsigned, GenericArray};
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait DynDigest {
fn update(&mut self, data: &[u8]);
fn finalize_reset(&mut self) -> Box<[u8]>;
fn finalize(self: Box<Self>) -> Box<[u8]>;
fn finalize_into(self, buf: &mut [u8]) -> Result<(), InvalidBufferLength>;
fn finalize_into_reset(&mut self, out: &mut [u8]) -> Result<(), InvalidBufferLength>;
fn reset(&mut self);
fn output_size(&self) -> usize;
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]> {
self.finalize_fixed_reset().to_vec().into_boxed_slice()
}
fn finalize(self: Box<Self>) -> Box<[u8]> {
self.finalize_fixed().to_vec().into_boxed_slice()
}
fn finalize_into(self, buf: &mut [u8]) -> Result<(), InvalidBufferLength> {
if buf.len() == self.output_size() {
self.finalize_into(GenericArray::from_mut_slice(buf));
Ok(())
} else {
Err(InvalidBufferLength)
}
}
fn finalize_into_reset(&mut self, buf: &mut [u8]) -> Result<(), InvalidBufferLength> {
if buf.len() == self.output_size() {
self.finalize_into_reset(GenericArray::from_mut_slice(buf));
Ok(())
} else {
Err(InvalidBufferLength)
}
}
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()
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
#[derive(Default, Debug, Copy, Clone, Eq, PartialEq)]
pub struct InvalidBufferLength;
impl fmt::Display for InvalidBufferLength {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("invalid buffer length")
}
}
#[cfg(feature = "std")]
impl std::error::Error for InvalidBufferLength {}