shadowsocks-rust 1.3.2

shadowsocks is a fast tunnel proxy that helps you bypass firewalls.
Documentation 
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//! Message digest algorithm

use rust_crypto::md5::Md5;
use rust_crypto::sha1::Sha1;

use bytes::{BufMut, BytesMut};

/// Digest trait
pub trait Digest: Send {
    /// Update data
    fn update(&mut self, data: &[u8]);

    /// Generates digest
    fn digest<B: BufMut>(&mut self, buf: &mut B);

    /// Length of digest
    fn digest_len(&self) -> usize;

    /// Reset digest
    fn reset(&mut self);
}

/// Type of defined digests
#[derive(Clone, Copy)]
pub enum DigestType {
    Md5,
    Sha1,
    Sha,
}

/// Create digest with type
pub fn with_type(t: DigestType) -> DigestVariant {
    match t {
        DigestType::Md5 => DigestVariant::Md5(Md5::new()),
        DigestType::Sha1 | DigestType::Sha => DigestVariant::Sha1(Sha1::new()),
    }
}

/// Variant of supported digest
pub enum DigestVariant {
    Md5(Md5),
    Sha1(Sha1),
}

impl Digest for DigestVariant {
    fn update(&mut self, data: &[u8]) {
        use rust_crypto::digest::Digest;

        match *self {
            DigestVariant::Md5(ref mut d) => d.input(data),
            DigestVariant::Sha1(ref mut d) => d.input(data),
        }
    }

    fn digest<B: BufMut>(&mut self, buf: &mut B) {
        use rust_crypto::digest::Digest;

        let mut local_buf = BytesMut::with_capacity(self.digest_len());
        unsafe {
            local_buf.set_len(self.digest_len());
        }

        match *self {
            DigestVariant::Md5(ref mut d) => d.result(&mut local_buf),
            DigestVariant::Sha1(ref mut d) => d.result(&mut local_buf),
        }

        buf.put(local_buf)
    }

    fn digest_len(&self) -> usize {
        use rust_crypto::digest::Digest;

        match *self {
            DigestVariant::Md5(ref d) => d.output_bytes(),
            DigestVariant::Sha1(ref d) => d.output_bytes(),
        }
    }

    fn reset(&mut self) {
        use rust_crypto::digest::Digest;

        match *self {
            DigestVariant::Md5(ref mut d) => d.reset(),
            DigestVariant::Sha1(ref mut d) => d.reset(),
        }
    }
}