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use super::{Input, FixedOutput, Reset};
use generic_array::{GenericArray, ArrayLength};
use generic_array::typenum::Unsigned;
/// The `Digest` trait specifies an interface common for digest functions.
///
/// It's a convenience wrapper around `Input`, `FixedOutput`, `Reset`, `Clone`,
/// and `Default` traits. It also provides additional convenience methods.
pub trait Digest {
type OutputSize: ArrayLength<u8>;
/// Create new hasher instance
fn new() -> Self;
/// Digest input data.
///
/// This method can be called repeatedly for use with streaming messages.
fn input<B: AsRef<[u8]>>(&mut self, data: B);
/// Digest input data in a chained manner.
fn chain<B: AsRef<[u8]>>(self, data: B) -> Self where Self: Sized;
/// Retrieve result and consume hasher instance.
fn result(self) -> GenericArray<u8, Self::OutputSize>;
/// Retrieve result and reset hasher instance.
///
/// This method sometimes can be more efficient compared to hasher
/// re-creation.
fn result_reset(&mut self) -> GenericArray<u8, Self::OutputSize>;
/// Reset hasher instance to its initial state.
fn reset(&mut self);
/// Get output size of the hasher
fn output_size() -> usize;
/// Convenience function to compute hash of the `data`. It will handle
/// hasher creation, data feeding and finalization.
///
/// Example:
///
/// ```rust,ignore
/// println!("{:x}", sha2::Sha256::digest(b"Hello world"));
/// ```
fn digest(data: &[u8]) -> GenericArray<u8, Self::OutputSize>;
}
impl<D: Input + FixedOutput + Reset + Clone + Default> Digest for D {
type OutputSize = <Self as FixedOutput>::OutputSize;
fn new() -> Self {
Self::default()
}
fn input<B: AsRef<[u8]>>(&mut self, data: B) {
Input::input(self, data);
}
fn chain<B: AsRef<[u8]>>(self, data: B) -> Self where Self: Sized {
Input::chain(self, data)
}
fn result(self) -> GenericArray<u8, Self::OutputSize> {
self.fixed_result()
}
fn result_reset(&mut self) -> GenericArray<u8, Self::OutputSize> {
let res = self.clone().fixed_result();
self.reset();
res
}
fn reset(&mut self) {
<Self as Reset>::reset(self)
}
fn output_size() -> usize {
Self::OutputSize::to_usize()
}
fn digest(data: &[u8]) -> GenericArray<u8, Self::OutputSize> {
let mut hasher = Self::default();
Input::input(&mut hasher, data);
hasher.fixed_result()
}
}
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