Copyright 2016 Huton.
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. All files, except a file written by third parties, may not
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File written by third parties:
* src/hash/des.rs:
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