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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::uint;
use std::vec;
/**
* 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.
*/
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) -> uint;
}
fn to_hex(rr: &[u8]) -> ~str {
let mut s = ~"";
for rr.iter().advance() |b| {
let hex = uint::to_str_radix(*b as uint, 16u);
if hex.len() == 1 {
s.push_char('0');
}
s.push_str(hex);
}
return s;
}
/// Contains utility methods for Digests.
/// FIXME: #7339: Convert to default methods when issues with them are resolved.
pub trait DigestUtil {
/**
* Convenience functon that feeds a string into a digest
*
* # Arguments
*
* * in The string to feed into the digest
*/
fn input_str(&mut self, input: &str);
/**
* Convenience functon that retrieves the result of a digest as a
* ~str in hexadecimal format.
*/
fn result_str(&mut self) -> ~str;
}
impl<D: Digest> DigestUtil for D {
fn input_str(&mut self, input: &str) {
self.input(input.as_bytes());
}
fn result_str(&mut self) -> ~str {
let mut buf = vec::from_elem((self.output_bits()+7)/8, 0u8);
self.result(buf);
return to_hex(buf);
}
}
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