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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::iter::repeat;
/**
* The Digest trait specifies an interface common to digest functions, such as SHA-1 and the SHA-2
* family of digest functions.
*/
pub trait Digest {
/**
* Provide message data.
*
* # Arguments
*
* * input - A vector of message data
*/
fn input(&mut self, input: &[u8]);
/**
* Retrieve the digest result. This method may be called multiple times.
*
* # Arguments
*
* * out - the vector to hold the result. Must be large enough to contain output_bits().
*/
fn result(&mut self, out: &mut [u8]);
/**
* Reset the digest. This method must be called after result() and before supplying more
* data.
*/
fn reset(&mut self);
/**
* Get the output size in bits.
*/
fn output_bits(&self) -> usize;
/**
* Get the output size in bytes.
*/
fn output_bytes(&self) -> usize {
(self.output_bits() + 7) / 8
}
/**
* Get the block size in bytes.
*/
fn block_size(&self) -> usize;
/**
* Convenience function that feeds a string into a digest.
*
* # Arguments
*
* * `input` The string to feed into the digest
*/
fn input_str(&mut self, input: &str) {
self.input(input.as_bytes());
}
/**
* Convenience function that retrieves the result of a digest as a
* String in hexadecimal format.
*/
fn result_str(&mut self) -> String {
use serialize::hex::ToHex;
let mut buf: Vec<u8> = repeat(0).take((self.output_bits()+7)/8).collect();
self.result(&mut buf);
buf[..].to_hex()
}
}