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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="kw">use</span> <span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">slice</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hashmap_random_keys</span>() <span class="op">-></span> (<span class="ident">u64</span>, <span class="ident">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">0</span>, <span class="number">0</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">view</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
<span class="ident">mem</span>::<span class="ident">size_of_val</span>(<span class="kw-2">&</span><span class="ident">v</span>));
<span class="ident">imp</span>::<span class="ident">fill_bytes</span>(<span class="ident">view</span>);
}
<span class="kw">return</span> <span class="ident">v</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">"openbsd"</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">"fuchsia"</span>)))]</span>
<span class="kw">mod</span> <span class="ident">imp</span> {
<span class="kw">use</span> <span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">use</span> <span class="ident">io</span>::<span class="ident">Read</span>;
<span class="kw">use</span> <span class="ident">libc</span>;
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">os</span>::<span class="ident">errno</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</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">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">syscall</span>(<span class="ident">libc</span>::<span class="ident">SYS_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="ident">libc</span>::<span class="ident">GRND_NONBLOCK</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</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="op">-></span> <span class="ident">bool</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">while</span> <span class="ident">read</span> <span class="op"><</span> <span class="ident">v</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">errno</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>;
<span class="kw">if</span> <span class="ident">err</span> <span class="op">==</span> <span class="ident">libc</span>::<span class="ident">EINTR</span> {
<span class="kw">continue</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">err</span> <span class="op">==</span> <span class="ident">libc</span>::<span class="ident">EAGAIN</span> {
<span class="kw">return</span> <span class="bool-val">false</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="kw">return</span> <span class="bool-val">true</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</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">io</span>;
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicBool</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">Once</span>;
<span class="kw">static</span> <span class="ident">CHECKER</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
<span class="kw">static</span> <span class="ident">AVAILABLE</span>: <span class="ident">AtomicBool</span> <span class="op">=</span> <span class="ident">AtomicBool</span>::<span class="ident">new</span>(<span class="bool-val">false</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">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</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">fn</span> <span class="ident">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="comment">// getrandom_fill_bytes here can fail if getrandom() returns EAGAIN,</span>
<span class="comment">// meaning it would have blocked because the non-blocking pool (urandom)</span>
<span class="comment">// has not initialized in the kernel yet due to a lack of entropy the</span>
<span class="comment">// fallback we do here is to avoid blocking applications which could</span>
<span class="comment">// depend on this call without ever knowing they do and don't have a</span>
<span class="comment">// work around. The PRNG of /dev/urandom will still be used but not</span>
<span class="comment">// over a completely full entropy pool</span>
<span class="kw">if</span> <span class="ident">is_getrandom_available</span>() <span class="op">&&</span> <span class="ident">getrandom_fill_bytes</span>(<span class="ident">v</span>) {
<span class="kw">return</span>
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"/dev/urandom"</span>)
.<span class="ident">expect</span>(<span class="string">"failed to open /dev/urandom"</span>);
<span class="ident">file</span>.<span class="ident">read_exact</span>(<span class="ident">v</span>).<span class="ident">expect</span>(<span class="string">"failed to read /dev/urandom"</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">use</span> <span class="ident">libc</span>;
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">os</span>::<span class="ident">errno</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">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="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="macro">panic</span><span class="macro">!</span>(<span class="string">"unexpected getentropy error: {}"</span>, <span class="ident">errno</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">use</span> <span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_int</span>, <span class="ident">size_t</span>};
<span class="kw">use</span> <span class="ident">ptr</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="ident">ptr</span>::<span class="ident">null</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">pub</span> <span class="kw">fn</span> <span class="ident">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="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="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">use</span> <span class="ident">libc</span>;
<span class="kw">use</span> <span class="ident">ptr</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">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="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">_</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">"fuchsia"</span>)]</span>
<span class="kw">mod</span> <span class="ident">imp</span> {
<span class="attribute">#[<span class="ident">link</span>(<span class="ident">name</span> <span class="op">=</span> <span class="string">"zircon"</span>)]</span>
<span class="kw">extern</span> {
<span class="kw">fn</span> <span class="ident">zx_cprng_draw</span>(<span class="ident">buffer</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">actual</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">i32</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">i32</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">actual</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">zx_cprng_draw</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="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">actual</span>);
<span class="kw">if</span> <span class="ident">status</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">Ok</span>(<span class="ident">actual</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">status</span>)
}
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">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">buf</span> <span class="op">=</span> <span class="ident">v</span>;
<span class="kw">while</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>() {
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">getrandom</span>(<span class="ident">buf</span>);
<span class="kw">match</span> <span class="ident">ret</span> {
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=></span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"kernel zx_cprng_draw call failed! (returned {}, buf.len() {})"</span>,
<span class="ident">err</span>, <span class="ident">buf</span>.<span class="ident">len</span>())
}
<span class="prelude-val">Ok</span>(<span class="ident">actual</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">move_buf</span> <span class="op">=</span> <span class="ident">buf</span>;
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">move_buf</span>[(<span class="ident">actual</span> <span class="kw">as</span> <span class="ident">usize</span>)..];
}
}
}
}
}
</pre>
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