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</pre><pre class='rust '>
<span class='comment'>// Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='doccomment'>//! Interfaces to the operating system provided random number</span>
<span class='doccomment'>//! generators.</span>
<span class='kw'>use</span> <span class='ident'>std</span>::{<span class='ident'>io</span>, <span class='ident'>mem</span>};
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='doccomment'>/// A random number generator that retrieves randomness straight from</span>
<span class='doccomment'>/// the operating system. Platform sources:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// - Unix-like systems (Linux, Android, Mac OSX): read directly from</span>
<span class='doccomment'>/// `/dev/urandom`, or from `getrandom(2)` system call if available.</span>
<span class='doccomment'>/// - OpenBSD: calls `getentropy(2)`</span>
<span class='doccomment'>/// - FreeBSD: uses the `kern.arandom` `sysctl(2)` mib</span>
<span class='doccomment'>/// - Windows: calls `CryptGenRandom`, using the default cryptographic</span>
<span class='doccomment'>/// service provider with the `PROV_RSA_FULL` type.</span>
<span class='doccomment'>/// - iOS: calls SecRandomCopyBytes as /dev/(u)random is sandboxed.</span>
<span class='doccomment'>/// - PNaCl: calls into the `nacl-irt-random-0.1` IRT interface.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This does not block.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span>(<span class='ident'>imp</span>::<span class='ident'>OsRng</span>);
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='doccomment'>/// Create a new `OsRng`.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='ident'>imp</span>::<span class='ident'>OsRng</span>::<span class='ident'>new</span>().<span class='ident'>map</span>(<span class='ident'>OsRng</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> { <span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>next_u32</span>() }
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> { <span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>next_u64</span>() }
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) { <span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>) }
}
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>mut</span> <span class='ident'>fill_buf</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>FnMut</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>])) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: [<span class='ident'>u8</span>; <span class='number'>4</span>] <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>4</span>];
<span class='ident'>fill_buf</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buf</span>);
<span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'><</span>[<span class='ident'>u8</span>; <span class='number'>4</span>], <span class='ident'>u32</span><span class='op'>></span>(<span class='ident'>buf</span>) }
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>mut</span> <span class='ident'>fill_buf</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>FnMut</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>])) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: [<span class='ident'>u8</span>; <span class='number'>8</span>] <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>8</span>];
<span class='ident'>fill_buf</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buf</span>);
<span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'><</span>[<span class='ident'>u8</span>; <span class='number'>8</span>], <span class='ident'>u64</span><span class='op'>></span>(<span class='ident'>buf</span>) }
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>unix</span>, <span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"ios"</span>),
<span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"nacl"</span>),
<span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"freebsd"</span>),
<span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"openbsd"</span>),
<span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"redox"</span>)))]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>OsRngInner</span>::<span class='kw-2'>*</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='ident'>read</span>::<span class='ident'>ReadRng</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>,
<span class='ident'>any</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86_64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"arm"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"aarch64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"powerpc"</span>)))]</span>
<span class='kw'>fn</span> <span class='ident'>getrandom</span>(<span class='ident'>buf</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>c_long</span> {
<span class='kw'>extern</span> <span class='string'>"C"</span> {
<span class='kw'>fn</span> <span class='ident'>syscall</span>(<span class='ident'>number</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span>, ...) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>c_long</span>;
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86_64"</span>)]</span>
<span class='kw'>const</span> <span class='ident'>NR_GETRANDOM</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span> <span class='op'>=</span> <span class='number'>318</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86"</span>)]</span>
<span class='kw'>const</span> <span class='ident'>NR_GETRANDOM</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span> <span class='op'>=</span> <span class='number'>355</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"arm"</span>)]</span>
<span class='kw'>const</span> <span class='ident'>NR_GETRANDOM</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span> <span class='op'>=</span> <span class='number'>384</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"aarch64"</span>)]</span>
<span class='kw'>const</span> <span class='ident'>NR_GETRANDOM</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span> <span class='op'>=</span> <span class='number'>278</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"powerpc"</span>)]</span>
<span class='kw'>const</span> <span class='ident'>NR_GETRANDOM</span>: <span class='ident'>libc</span>::<span class='ident'>c_long</span> <span class='op'>=</span> <span class='number'>384</span>;
<span class='kw'>unsafe</span> {
<span class='ident'>syscall</span>(<span class='ident'>NR_GETRANDOM</span>, <span class='ident'>buf</span>.<span class='ident'>as_mut_ptr</span>(), <span class='ident'>buf</span>.<span class='ident'>len</span>(), <span class='number'>0</span>)
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>not</span>(<span class='ident'>all</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>,
<span class='ident'>any</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86_64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"arm"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"aarch64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"powerpc"</span>))))]</span>
<span class='kw'>fn</span> <span class='ident'>getrandom</span>(<span class='ident'>_buf</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>c_long</span> { <span class='op'>-</span><span class='number'>1</span> }
<span class='kw'>fn</span> <span class='ident'>getrandom_fill_bytes</span>(<span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>read</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>len</span>();
<span class='kw'>while</span> <span class='ident'>read</span> <span class='op'><</span> <span class='ident'>len</span> {
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>getrandom</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>v</span>[<span class='ident'>read</span>..]);
<span class='kw'>if</span> <span class='ident'>result</span> <span class='op'>==</span> <span class='op'>-</span><span class='number'>1</span> {
<span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>();
<span class='kw'>if</span> <span class='ident'>err</span>.<span class='ident'>kind</span>() <span class='op'>==</span> <span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Interrupted</span> {
<span class='kw'>continue</span>
} <span class='kw'>else</span> {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"unexpected getrandom error: {}"</span>, <span class='ident'>err</span>);
}
} <span class='kw'>else</span> {
<span class='ident'>read</span> <span class='op'>+=</span> <span class='ident'>result</span> <span class='kw'>as</span> <span class='ident'>usize</span>;
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>,
<span class='ident'>any</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86_64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"arm"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"aarch64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"powerpc"</span>)))]</span>
<span class='kw'>fn</span> <span class='ident'>is_getrandom_available</span>() <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>atomic</span>::{<span class='ident'>AtomicBool</span>, <span class='ident'>ATOMIC_BOOL_INIT</span>, <span class='ident'>Ordering</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{<span class='ident'>Once</span>, <span class='ident'>ONCE_INIT</span>};
<span class='kw'>static</span> <span class='ident'>CHECKER</span>: <span class='ident'>Once</span> <span class='op'>=</span> <span class='ident'>ONCE_INIT</span>;
<span class='kw'>static</span> <span class='ident'>AVAILABLE</span>: <span class='ident'>AtomicBool</span> <span class='op'>=</span> <span class='ident'>ATOMIC_BOOL_INIT</span>;
<span class='ident'>CHECKER</span>.<span class='ident'>call_once</span>(<span class='op'>||</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: [<span class='ident'>u8</span>; <span class='number'>0</span>] <span class='op'>=</span> [];
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>getrandom</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buf</span>);
<span class='kw'>let</span> <span class='ident'>available</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>result</span> <span class='op'>==</span> <span class='op'>-</span><span class='number'>1</span> {
<span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>().<span class='ident'>raw_os_error</span>();
<span class='ident'>err</span> <span class='op'>!=</span> <span class='prelude-val'>Some</span>(<span class='ident'>libc</span>::<span class='ident'>ENOSYS</span>)
} <span class='kw'>else</span> {
<span class='bool-val'>true</span>
};
<span class='ident'>AVAILABLE</span>.<span class='ident'>store</span>(<span class='ident'>available</span>, <span class='ident'>Ordering</span>::<span class='ident'>Relaxed</span>);
});
<span class='ident'>AVAILABLE</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>Relaxed</span>)
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>not</span>(<span class='ident'>all</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>,
<span class='ident'>any</span>(<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86_64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"x86"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"arm"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"aarch64"</span>,
<span class='ident'>target_arch</span> <span class='op'>=</span> <span class='string'>"powerpc"</span>))))]</span>
<span class='kw'>fn</span> <span class='ident'>is_getrandom_available</span>() <span class='op'>-></span> <span class='ident'>bool</span> { <span class='bool-val'>false</span> }
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span> {
<span class='ident'>inner</span>: <span class='ident'>OsRngInner</span>,
}
<span class='kw'>enum</span> <span class='ident'>OsRngInner</span> {
<span class='ident'>OsGetrandomRng</span>,
<span class='ident'>OsReadRng</span>(<span class='ident'>ReadRng</span><span class='op'><</span><span class='ident'>File</span><span class='op'>></span>),
}
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='kw'>if</span> <span class='ident'>is_getrandom_available</span>() {
<span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span> { <span class='ident'>inner</span>: <span class='ident'>OsGetrandomRng</span> });
}
<span class='kw'>let</span> <span class='ident'>reader</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>open</span>(<span class='string'>"/dev/urandom"</span>));
<span class='kw'>let</span> <span class='ident'>reader_rng</span> <span class='op'>=</span> <span class='ident'>ReadRng</span>::<span class='ident'>new</span>(<span class='ident'>reader</span>);
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span> { <span class='ident'>inner</span>: <span class='ident'>OsReadRng</span>(<span class='ident'>reader_rng</span>) })
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>inner</span> {
<span class='ident'>OsGetrandomRng</span> <span class='op'>=></span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>getrandom_fill_bytes</span>),
<span class='ident'>OsReadRng</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span>) <span class='op'>=></span> <span class='ident'>rng</span>.<span class='ident'>next_u32</span>(),
}
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>inner</span> {
<span class='ident'>OsGetrandomRng</span> <span class='op'>=></span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>getrandom_fill_bytes</span>),
<span class='ident'>OsReadRng</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span>) <span class='op'>=></span> <span class='ident'>rng</span>.<span class='ident'>next_u64</span>(),
}
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>inner</span> {
<span class='ident'>OsGetrandomRng</span> <span class='op'>=></span> <span class='ident'>getrandom_fill_bytes</span>(<span class='ident'>v</span>),
<span class='ident'>OsReadRng</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span>) <span class='op'>=></span> <span class='ident'>rng</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>)
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"ios"</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>libc</span>::{<span class='ident'>c_int</span>, <span class='ident'>size_t</span>};
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span>;
<span class='kw'>enum</span> <span class='ident'>SecRandom</span> {}
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>non_upper_case_globals</span>)]</span>
<span class='kw'>const</span> <span class='ident'>kSecRandomDefault</span>: <span class='kw-2'>*</span><span class='kw'>const</span> <span class='ident'>SecRandom</span> <span class='op'>=</span> <span class='number'>0</span> <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw'>const</span> <span class='ident'>SecRandom</span>;
<span class='attribute'>#[<span class='ident'>link</span>(<span class='ident'>name</span> <span class='op'>=</span> <span class='string'>"Security"</span>, <span class='ident'>kind</span> <span class='op'>=</span> <span class='string'>"framework"</span>)]</span>
<span class='kw'>extern</span> {
<span class='kw'>fn</span> <span class='ident'>SecRandomCopyBytes</span>(<span class='ident'>rnd</span>: <span class='kw-2'>*</span><span class='kw'>const</span> <span class='ident'>SecRandom</span>,
<span class='ident'>count</span>: <span class='ident'>size_t</span>, <span class='ident'>bytes</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>u8</span>) <span class='op'>-></span> <span class='ident'>c_int</span>;
}
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>SecRandomCopyBytes</span>(<span class='ident'>kSecRandomDefault</span>, <span class='ident'>v</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>size_t</span>, <span class='ident'>v</span>.<span class='ident'>as_mut_ptr</span>())
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='op'>-</span><span class='number'>1</span> {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"couldn't generate random bytes: {}"</span>, <span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>());
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"freebsd"</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::{<span class='ident'>io</span>, <span class='ident'>ptr</span>};
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span>;
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='kw'>let</span> <span class='ident'>mib</span> <span class='op'>=</span> [<span class='ident'>libc</span>::<span class='ident'>CTL_KERN</span>, <span class='ident'>libc</span>::<span class='ident'>KERN_ARND</span>];
<span class='comment'>// kern.arandom permits a maximum buffer size of 256 bytes</span>
<span class='kw'>for</span> <span class='ident'>s</span> <span class='kw'>in</span> <span class='ident'>v</span>.<span class='ident'>chunks_mut</span>(<span class='number'>256</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s_len</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>len</span>();
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>libc</span>::<span class='ident'>sysctl</span>(<span class='ident'>mib</span>.<span class='ident'>as_ptr</span>(), <span class='ident'>mib</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>libc</span>::<span class='ident'>c_uint</span>,
<span class='ident'>s</span>.<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> _, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>s_len</span>,
<span class='ident'>ptr</span>::<span class='ident'>null</span>(), <span class='number'>0</span>)
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='op'>-</span><span class='number'>1</span> <span class='op'>||</span> <span class='ident'>s_len</span> <span class='op'>!=</span> <span class='ident'>s</span>.<span class='ident'>len</span>() {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"kern.arandom sysctl failed! (returned {}, s.len() {}, oldlenp {})"</span>,
<span class='ident'>ret</span>, <span class='ident'>s</span>.<span class='ident'>len</span>(), <span class='ident'>s_len</span>);
}
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"openbsd"</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span>;
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='comment'>// getentropy(2) permits a maximum buffer size of 256 bytes</span>
<span class='kw'>for</span> <span class='ident'>s</span> <span class='kw'>in</span> <span class='ident'>v</span>.<span class='ident'>chunks_mut</span>(<span class='number'>256</span>) {
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>libc</span>::<span class='ident'>getentropy</span>(<span class='ident'>s</span>.<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>c_void</span>, <span class='ident'>s</span>.<span class='ident'>len</span>())
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='op'>-</span><span class='number'>1</span> {
<span class='kw'>let</span> <span class='ident'>err</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>();
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"getentropy failed: {}"</span>, <span class='ident'>err</span>);
}
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"redox"</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>::<span class='ident'>File</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='ident'>read</span>::<span class='ident'>ReadRng</span>;
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span> {
<span class='ident'>inner</span>: <span class='ident'>ReadRng</span><span class='op'><</span><span class='ident'>File</span><span class='op'>></span>,
}
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>reader</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>File</span>::<span class='ident'>open</span>(<span class='string'>"rand:"</span>));
<span class='kw'>let</span> <span class='ident'>reader_rng</span> <span class='op'>=</span> <span class='ident'>ReadRng</span>::<span class='ident'>new</span>(<span class='ident'>reader</span>);
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span> { <span class='ident'>inner</span>: <span class='ident'>reader_rng</span> })
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>next_u32</span>()
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>next_u64</span>()
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>)
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>windows</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ptr</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>type</span> <span class='ident'>BOOL</span> <span class='op'>=</span> <span class='ident'>i32</span>;
<span class='kw'>type</span> <span class='ident'>LPCSTR</span> <span class='op'>=</span> <span class='kw-2'>*</span><span class='kw'>const</span> <span class='ident'>i8</span>;
<span class='kw'>type</span> <span class='ident'>DWORD</span> <span class='op'>=</span> <span class='ident'>u32</span>;
<span class='kw'>type</span> <span class='ident'>HCRYPTPROV</span> <span class='op'>=</span> <span class='ident'>usize</span>;
<span class='kw'>type</span> <span class='ident'>BYTE</span> <span class='op'>=</span> <span class='ident'>u8</span>;
<span class='kw'>const</span> <span class='ident'>PROV_RSA_FULL</span>: <span class='ident'>DWORD</span> <span class='op'>=</span> <span class='number'>1</span>;
<span class='kw'>const</span> <span class='ident'>CRYPT_SILENT</span>: <span class='ident'>DWORD</span> <span class='op'>=</span> <span class='number'>0x00000040</span>;
<span class='kw'>const</span> <span class='ident'>CRYPT_VERIFYCONTEXT</span>: <span class='ident'>DWORD</span> <span class='op'>=</span> <span class='number'>0xF0000000</span>;
<span class='attribute'>#[<span class='ident'>link</span>(<span class='ident'>name</span> <span class='op'>=</span> <span class='string'>"advapi32"</span>)]</span>
<span class='kw'>extern</span> <span class='string'>"system"</span> {
<span class='kw'>fn</span> <span class='ident'>CryptAcquireContextA</span>(<span class='ident'>phProv</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>HCRYPTPROV</span>,
<span class='ident'>szContainer</span>: <span class='ident'>LPCSTR</span>,
<span class='ident'>szProvider</span>: <span class='ident'>LPCSTR</span>,
<span class='ident'>dwProvType</span>: <span class='ident'>DWORD</span>,
<span class='ident'>dwFlags</span>: <span class='ident'>DWORD</span>) <span class='op'>-></span> <span class='ident'>BOOL</span>;
<span class='kw'>fn</span> <span class='ident'>CryptGenRandom</span>(<span class='ident'>hProv</span>: <span class='ident'>HCRYPTPROV</span>,
<span class='ident'>dwLen</span>: <span class='ident'>DWORD</span>,
<span class='ident'>pbBuffer</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>BYTE</span>) <span class='op'>-></span> <span class='ident'>BOOL</span>;
<span class='kw'>fn</span> <span class='ident'>CryptReleaseContext</span>(<span class='ident'>hProv</span>: <span class='ident'>HCRYPTPROV</span>, <span class='ident'>dwFlags</span>: <span class='ident'>DWORD</span>) <span class='op'>-></span> <span class='ident'>BOOL</span>;
}
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span> {
<span class='ident'>hcryptprov</span>: <span class='ident'>HCRYPTPROV</span>
}
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hcp</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>CryptAcquireContextA</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>hcp</span>, <span class='ident'>ptr</span>::<span class='ident'>null</span>(), <span class='ident'>ptr</span>::<span class='ident'>null</span>(),
<span class='ident'>PROV_RSA_FULL</span>,
<span class='ident'>CRYPT_VERIFYCONTEXT</span> <span class='op'>|</span> <span class='ident'>CRYPT_SILENT</span>)
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='prelude-val'>Err</span>(<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>())
} <span class='kw'>else</span> {
<span class='prelude-val'>Ok</span>(<span class='ident'>OsRng</span> { <span class='ident'>hcryptprov</span>: <span class='ident'>hcp</span> })
}
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='comment'>// CryptGenRandom takes a DWORD (u32) for the length so we need to</span>
<span class='comment'>// split up the buffer.</span>
<span class='kw'>for</span> <span class='ident'>slice</span> <span class='kw'>in</span> <span class='ident'>v</span>.<span class='ident'>chunks_mut</span>(<span class='op'><</span><span class='ident'>DWORD</span><span class='op'>></span>::<span class='ident'>max_value</span>() <span class='kw'>as</span> <span class='ident'>usize</span>) {
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>CryptGenRandom</span>(<span class='self'>self</span>.<span class='ident'>hcryptprov</span>, <span class='ident'>slice</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>DWORD</span>,
<span class='ident'>slice</span>.<span class='ident'>as_mut_ptr</span>())
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"couldn't generate random bytes: {}"</span>,
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>());
}
}
}
}
<span class='kw'>impl</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>CryptReleaseContext</span>(<span class='self'>self</span>.<span class='ident'>hcryptprov</span>, <span class='number'>0</span>)
};
<span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"couldn't release context: {}"</span>,
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>last_os_error</span>());
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"nacl"</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>imp</span> {
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>next_u32</span>, <span class='ident'>next_u64</span>};
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OsRng</span>(<span class='kw'>extern</span> <span class='kw'>fn</span>(<span class='ident'>dest</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>c_void</span>,
<span class='ident'>bytes</span>: <span class='ident'>libc</span>::<span class='ident'>size_t</span>,
<span class='ident'>read</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>c_int</span>);
<span class='kw'>extern</span> {
<span class='kw'>fn</span> <span class='ident'>nacl_interface_query</span>(<span class='ident'>name</span>: <span class='kw-2'>*</span><span class='kw'>const</span> <span class='ident'>libc</span>::<span class='ident'>c_char</span>,
<span class='ident'>table</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>c_void</span>,
<span class='ident'>table_size</span>: <span class='ident'>libc</span>::<span class='ident'>size_t</span>) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>;
}
<span class='kw'>const</span> <span class='ident'>INTERFACE</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='ident'>u8</span>] <span class='op'>=</span> <span class='string'>b"nacl-irt-random-0.1\0"</span>;
<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>C</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>NaClIRTRandom</span> {
<span class='ident'>get_random_bytes</span>: <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw'>extern</span> <span class='kw'>fn</span>(<span class='ident'>dest</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>c_void</span>,
<span class='ident'>bytes</span>: <span class='ident'>libc</span>::<span class='ident'>size_t</span>,
<span class='ident'>read</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>) <span class='op'>-></span> <span class='ident'>libc</span>::<span class='ident'>c_int</span><span class='op'>></span>,
}
<span class='kw'>impl</span> <span class='ident'>OsRng</span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>OsRng</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>iface</span> <span class='op'>=</span> <span class='ident'>NaClIRTRandom</span> {
<span class='ident'>get_random_bytes</span>: <span class='prelude-val'>None</span>,
};
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
<span class='ident'>nacl_interface_query</span>(<span class='ident'>INTERFACE</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw'>const</span> _,
<span class='ident'>mem</span>::<span class='ident'>transmute</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>iface</span>),
<span class='ident'>mem</span>::<span class='ident'>size_of</span>::<span class='op'><</span><span class='ident'>NaClIRTRandom</span><span class='op'>></span>() <span class='kw'>as</span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>)
};
<span class='kw'>if</span> <span class='ident'>result</span> <span class='op'>!=</span> <span class='number'>0</span> {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>iface</span>.<span class='ident'>get_random_bytes</span>.<span class='ident'>is_some</span>());
<span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>OsRng</span>(<span class='ident'>iface</span>.<span class='ident'>get_random_bytes</span>.<span class='ident'>take</span>().<span class='ident'>unwrap</span>());
<span class='prelude-val'>Ok</span>(<span class='ident'>result</span>)
} <span class='kw'>else</span> {
<span class='kw'>let</span> <span class='ident'>error</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>NotFound</span>;
<span class='kw'>let</span> <span class='ident'>error</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>error</span>, <span class='string'>"IRT random interface missing"</span>);
<span class='prelude-val'>Err</span>(<span class='ident'>error</span>)
}
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>OsRng</span> {
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>v</span>))
}
<span class='kw'>fn</span> <span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>read</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>loop</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span>: <span class='ident'>libc</span>::<span class='ident'>size_t</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>len</span>();
<span class='kw'>let</span> <span class='ident'>error</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='number'>0</span>)(<span class='ident'>v</span>[<span class='ident'>read</span>..].<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> _,
(<span class='ident'>len</span> <span class='op'>-</span> <span class='ident'>read</span>) <span class='kw'>as</span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>,
<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>r</span> <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> _);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>error</span> <span class='op'>==</span> <span class='number'>0</span>, <span class='string'>"`get_random_bytes` failed!"</span>);
<span class='ident'>read</span> <span class='op'>+=</span> <span class='ident'>r</span> <span class='kw'>as</span> <span class='ident'>usize</span>;
<span class='kw'>if</span> <span class='ident'>read</span> <span class='op'>>=</span> <span class='ident'>v</span>.<span class='ident'>len</span>() { <span class='kw'>break</span>; }
}
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>test</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>mpsc</span>::<span class='ident'>channel</span>;
<span class='kw'>use</span> <span class='ident'>Rng</span>;
<span class='kw'>use</span> <span class='ident'>OsRng</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>;
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_os_rng</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>OsRng</span>::<span class='ident'>new</span>().<span class='ident'>unwrap</span>();
<span class='ident'>r</span>.<span class='ident'>next_u32</span>();
<span class='ident'>r</span>.<span class='ident'>next_u64</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>1000</span>];
<span class='ident'>r</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>v</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_os_rng_tasks</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>txs</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>();
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>20</span> {
<span class='kw'>let</span> (<span class='ident'>tx</span>, <span class='ident'>rx</span>) <span class='op'>=</span> <span class='ident'>channel</span>();
<span class='ident'>txs</span>.<span class='ident'>push</span>(<span class='ident'>tx</span>);
<span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span><span class='op'>||</span> {
<span class='comment'>// wait until all the tasks are ready to go.</span>
<span class='ident'>rx</span>.<span class='ident'>recv</span>().<span class='ident'>unwrap</span>();
<span class='comment'>// deschedule to attempt to interleave things as much</span>
<span class='comment'>// as possible (XXX: is this a good test?)</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>OsRng</span>::<span class='ident'>new</span>().<span class='ident'>unwrap</span>();
<span class='ident'>thread</span>::<span class='ident'>yield_now</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>1000</span>];
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>100</span> {
<span class='ident'>r</span>.<span class='ident'>next_u32</span>();
<span class='ident'>thread</span>::<span class='ident'>yield_now</span>();
<span class='ident'>r</span>.<span class='ident'>next_u64</span>();
<span class='ident'>thread</span>::<span class='ident'>yield_now</span>();
<span class='ident'>r</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>v</span>);
<span class='ident'>thread</span>::<span class='ident'>yield_now</span>();
}
});
}
<span class='comment'>// start all the tasks</span>
<span class='kw'>for</span> <span class='ident'>tx</span> <span class='kw'>in</span> <span class='ident'>txs</span>.<span class='ident'>iter</span>() {
<span class='ident'>tx</span>.<span class='ident'>send</span>(()).<span class='ident'>unwrap</span>();
}
}
}
</pre>
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