Struct digest_writer::Writer

pub struct Writer<D>(_);

A wrapper around Digest type that allows to use Write trait for hashing

Example

extern crate sha2;
extern crate digest;
extern crate digest_writer;
use std::fs::File;
use std::io::{self, Write};
use digest::FixedOutput;
use digest_writer::Writer;
let mut digest = Writer::new(sha2::Sha256::default());
let mut f = File::open("LICENSE-MIT").unwrap();
io::copy(&mut f, &mut digest).unwrap();
digest.fixed_result();

Methods

impl<D: Input + FixedOutput> Writer<D>

fn new(d: D) -> Writer<D>

Wrap a Digest into a Writer

fn get_ref(&self) -> &D

Returns a reference to underlying Digest object

fn get_mut(&mut self) -> &mut D

Returns a mutable reference to underlying Digest object

fn into_inner(self) -> D

Return the original Digest

Trait Implementations

impl<D: Debug> Debug for Writer<D>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<D: Clone> Clone for Writer<D>

fn clone(&self) -> Writer<D>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<D: Default> Default for Writer<D>

fn default() -> Writer<D>

Returns the "default value" for a type.

impl<D: Input> Write for Writer<D>

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this object, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this write.

fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.

impl<D: Input> Input for Writer<D>

fn process(&mut self, input: &[u8])

Digest input data. This method can be called repeatedly for use with streaming messages.

impl<D> BlockInput for Writer<D> where
    D: BlockInput,
    D::BlockSize: ArrayLength<u8>, 

type BlockSize = D::BlockSize

impl<D> FixedOutput for Writer<D> where
    D: FixedOutput,
    D::OutputSize: ArrayLength<u8>, 

type OutputSize = D::OutputSize

fn fixed_result(self) -> GenericArray<u8, Self::OutputSize>

Retrieve the digest result. This method consumes digest instance.

impl<D: VariableOutput> VariableOutput for Writer<D>

fn new(output_size: usize) -> Result<Writer<D>, InvalidLength>

Create new hasher instance with given output size. Will return Err(InvalidLength) in case if hasher can not work with the given output size. Will always return an error if output size equals to zero.

fn output_size(&self) -> usize

Get output size of the hasher instance provided to the new method

fn variable_result(self, buffer: &mut [u8]) -> Result<&[u8], InvalidLength>

Retrieve the digest result into provided buffer. Length of the buffer must be equal to output size provided to the new method, otherwise Err(InvalidLength) will be returned