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// Copyright (c) 2016 Mark Lee // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. //! A cryptographic hash generator dependent upon OSX's `CommonCrypto`. use commoncrypto::hash; use std::io; use super::Algorithm; /// Generator of digests using a cryptographic hash function. /// /// # Examples /// /// ```rust /// use crypto_hash::{Algorithm, Hasher}; /// use std::io::Write; /// /// let mut hasher = Hasher::new(Algorithm::SHA256); /// hasher.write_all(b"crypto"); /// hasher.write_all(b"-"); /// hasher.write_all(b"hash"); /// let result = hasher.finish(); /// let expected = /// b"\xfd\x1a\xfb`\"\xcdMG\xc8\x90\x96\x1cS9(\xea\xcf\xe8!\x9f\x1b%$\xf7\xfb*a\x84}\xdf\x8c'" /// .to_vec(); /// assert_eq!(expected, result) /// ``` #[derive(Debug)] pub struct Hasher(hash::Hasher); impl Hasher { /// Create a new `Hasher` for the given `Algorithm`. pub fn new(algorithm: Algorithm) -> Hasher { let cc_algorithm = match algorithm { Algorithm::MD5 => hash::CCDigestAlgorithm::kCCDigestMD5, Algorithm::SHA1 => hash::CCDigestAlgorithm::kCCDigestSHA1, Algorithm::SHA256 => hash::CCDigestAlgorithm::kCCDigestSHA256, Algorithm::SHA512 => hash::CCDigestAlgorithm::kCCDigestSHA512, }; Hasher(hash::Hasher::new(cc_algorithm)) } /// Generate a digest from the data written to the `Hasher`. pub fn finish(&mut self) -> Vec<u8> { let Hasher(ref mut hasher) = *self; match hasher.finish() { Ok(digest) => digest, Err(error) => panic!("CommonCrypto error: {}", error), } } } impl io::Write for Hasher { fn write(&mut self, buf: &[u8]) -> io::Result<usize> { let Hasher(ref mut hasher) = *self; hasher.write(buf) } fn flush(&mut self) -> io::Result<()> { let Hasher(ref mut hasher) = *self; hasher.flush() } }