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</pre><pre class='rust '>
<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'>/*!
* An implementation of the Fortuna CSPRNG
*
* First create a `FortunaRng` object using either the `new_unseeded`
* constructor or `SeedableRng::from_seed`. Additional entropy may be
* added using the method `add_random_event`, or the underlying RNG
* maybe reseeded directly by `SeedableRng::reseed`. Note that this is
* not recommended, since the generator automatically reseeds itself
* using the data provided by `add_random_events` through an
* accumulator. The accumulator is part of Fortuna's design and using
* `SeedableRng::reseed` directly bypasses it.
*
* Note that the underlying block cipher is `AesSafe256Encryptor` which
* is designed to be timing-attack resistant. The speed hit from this
* is in line with a "safety first" API, but be aware of it.
*
* Fortuna was originally described in
* Practical Cryptography, Niels Ferguson and Bruce Schneier.
* John Wiley & Sons, 2003.
*
* Comments throughout this file contain references of the form
* (PC 1.2.3); these refer to sections within this text.
*
* # A note on forking
*
* Proper behaviour for a CSRNG on a process fork is to reseed itself with
* the timestamp and new process ID, to ensure that after forking the child
* process does not share the same RNG state (and therefore the same output)
* as its parent.
*
* However, this appears not to be possible in Rust, due to
* https://github.com/rust-lang/rust/issues/16799
* The reason is that Rust's process management all happens through its
* stdlib runtime, which explicitly does not support forking, so it provides
* no mechanism with which to detect forks.
*
* What this means is that if you are writing forking code (using `#![no_std]`
* say) then you need to EXPLICITLY RESEED THE RNG AFTER FORKING.
*/</span>
<span class='kw'>use</span> <span class='ident'>cryptoutil</span>::<span class='ident'>copy_memory</span>;
<span class='kw'>use</span> <span class='ident'>rand</span>::{<span class='ident'>Rng</span>, <span class='ident'>SeedableRng</span>};
<span class='kw'>use</span> <span class='ident'>time</span>::<span class='ident'>precise_time_s</span>;
<span class='kw'>use</span> <span class='ident'>aessafe</span>::<span class='ident'>AesSafe256Encryptor</span>;
<span class='kw'>use</span> <span class='ident'>cryptoutil</span>::<span class='ident'>read_u32_le</span>;
<span class='kw'>use</span> <span class='ident'>digest</span>::<span class='ident'>Digest</span>;
<span class='kw'>use</span> <span class='ident'>sha2</span>::<span class='ident'>Sha256</span>;
<span class='kw'>use</span> <span class='ident'>symmetriccipher</span>::<span class='ident'>BlockEncryptor</span>;
<span class='doccomment'>/// Length in bytes that the first pool must be before a "catastrophic</span>
<span class='doccomment'>/// reseed" is allowed to happen. (A direct reseed through the</span>
<span class='doccomment'>/// `SeedableRng` API is not affected by this limit.)</span>
<span class='kw'>pub</span> <span class='kw'>const</span> <span class='ident'>MIN_POOL_SIZE</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>64</span>;
<span class='doccomment'>/// Maximum number of bytes to generate before rekeying</span>
<span class='kw'>const</span> <span class='ident'>MAX_GEN_SIZE</span>: <span class='ident'>usize</span> <span class='op'>=</span> (<span class='number'>1</span> <span class='op'><<</span> <span class='number'>20</span>);
<span class='doccomment'>/// Length in bytes of the AES key</span>
<span class='kw'>const</span> <span class='ident'>KEY_LEN</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>32</span>;
<span class='doccomment'>/// Length in bytes of the AES counter</span>
<span class='kw'>const</span> <span class='ident'>CTR_LEN</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>16</span>;
<span class='doccomment'>/// Length in bytes of the AES block</span>
<span class='kw'>const</span> <span class='ident'>AES_BLOCK_SIZE</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>16</span>;
<span class='doccomment'>/// Number of pools used to accumulate entropy</span>
<span class='kw'>const</span> <span class='ident'>NUM_POOLS</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>32</span>;
<span class='doccomment'>/// The underlying PRNG (PC 9.4)</span>
<span class='kw'>struct</span> <span class='ident'>FortunaGenerator</span> {
<span class='ident'>key</span>: [<span class='ident'>u8</span>; <span class='ident'>KEY_LEN</span>],
<span class='ident'>ctr</span>: [<span class='ident'>u8</span>; <span class='ident'>CTR_LEN</span>],
}
<span class='kw'>impl</span> <span class='ident'>FortunaGenerator</span> {
<span class='doccomment'>/// Creates a new generator (PC 9.4.1)</span>
<span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>FortunaGenerator</span> {
<span class='ident'>FortunaGenerator</span> {
<span class='ident'>key</span>: [<span class='number'>0</span>; <span class='ident'>KEY_LEN</span>],
<span class='ident'>ctr</span>: [<span class='number'>0</span>; <span class='ident'>CTR_LEN</span>],
}
}
<span class='doccomment'>/// Increments the counter in place</span>
<span class='kw'>fn</span> <span class='ident'>increment_counter</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='self'>self</span>.<span class='ident'>ctr</span>.<span class='ident'>len</span>() {
<span class='self'>self</span>.<span class='ident'>ctr</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>ctr</span>[<span class='ident'>i</span>].<span class='ident'>wrapping_add</span>(<span class='number'>1</span>);
<span class='comment'>// As soon as we don't carry, stop</span>
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>ctr</span>[<span class='ident'>i</span>] <span class='op'>!=</span> <span class='number'>0</span> {
<span class='kw'>break</span>;
}
}
}
<span class='doccomment'>/// Reseeds the generator (PC 9.4.2)</span>
<span class='kw'>fn</span> <span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) {
<span class='comment'>// Compute key as Sha256d( key || s )</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hasher</span> <span class='op'>=</span> <span class='ident'>Sha256</span>::<span class='ident'>new</span>();
<span class='ident'>hasher</span>.<span class='ident'>input</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>key</span>[..]);
<span class='ident'>hasher</span>.<span class='ident'>input</span>(<span class='ident'>s</span>);
<span class='ident'>hasher</span>.<span class='ident'>result</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>key</span>);
<span class='ident'>hasher</span> <span class='op'>=</span> <span class='ident'>Sha256</span>::<span class='ident'>new</span>();
<span class='ident'>hasher</span>.<span class='ident'>input</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>key</span>[..]);
<span class='ident'>hasher</span>.<span class='ident'>result</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>key</span>[..]);
<span class='comment'>// Increment the counter</span>
<span class='self'>self</span>.<span class='ident'>increment_counter</span>();
}
<span class='doccomment'>/// Generates some `k` 16-byte blocks of random output (PC 9.4.3)</span>
<span class='doccomment'>/// This should never be used directly, except by `generate_random_data`.</span>
<span class='kw'>fn</span> <span class='ident'>generate_blocks</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>k</span>: <span class='ident'>usize</span>, <span class='ident'>out</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>ctr</span>[..] <span class='op'>!=</span> [<span class='number'>0</span>; <span class='ident'>CTR_LEN</span>][..]);
<span class='comment'>// Setup AES encryptor</span>
<span class='kw'>let</span> <span class='ident'>block_encryptor</span> <span class='op'>=</span> <span class='ident'>AesSafe256Encryptor</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>key</span>[..]);
<span class='comment'>// Concatenate all the blocks</span>
<span class='kw'>for</span> <span class='ident'>j</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='ident'>k</span> {
<span class='ident'>block_encryptor</span>.<span class='ident'>encrypt_block</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>ctr</span>[..],
<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>out</span>[<span class='ident'>AES_BLOCK_SIZE</span> <span class='op'>*</span> <span class='ident'>j</span>..<span class='ident'>AES_BLOCK_SIZE</span> <span class='op'>*</span> (<span class='ident'>j</span> <span class='op'>+</span> <span class='number'>1</span>)]);
<span class='self'>self</span>.<span class='ident'>increment_counter</span>();
}
}
<span class='doccomment'>/// Generates `n` bytes of random data (9.4.4)</span>
<span class='kw'>fn</span> <span class='ident'>generate_random_data</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>out</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'>n</span>, <span class='ident'>rem</span>) <span class='op'>=</span> (<span class='ident'>out</span>.<span class='ident'>len</span>() <span class='op'>/</span> <span class='ident'>AES_BLOCK_SIZE</span>, <span class='ident'>out</span>.<span class='ident'>len</span>() <span class='op'>%</span> <span class='ident'>AES_BLOCK_SIZE</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>n</span> <span class='op'><=</span> <span class='ident'>MAX_GEN_SIZE</span>);
<span class='comment'>// Generate output</span>
<span class='self'>self</span>.<span class='ident'>generate_blocks</span>(<span class='ident'>n</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>out</span>[..(<span class='ident'>n</span> <span class='op'>*</span> <span class='ident'>AES_BLOCK_SIZE</span>)]);
<span class='kw'>if</span> <span class='ident'>rem</span> <span class='op'>></span> <span class='number'>0</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='ident'>AES_BLOCK_SIZE</span>];
<span class='self'>self</span>.<span class='ident'>generate_blocks</span>(<span class='number'>1</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>buf</span>);
<span class='ident'>copy_memory</span>(<span class='kw-2'>&</span><span class='ident'>buf</span>[..<span class='ident'>rem</span>], <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>out</span>[(<span class='ident'>n</span> <span class='op'>*</span> <span class='ident'>AES_BLOCK_SIZE</span>)..]);
}
<span class='comment'>// Rekey</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_key</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='ident'>KEY_LEN</span>];
<span class='self'>self</span>.<span class='ident'>generate_blocks</span>(<span class='ident'>KEY_LEN</span> <span class='op'>/</span> <span class='ident'>AES_BLOCK_SIZE</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>new_key</span>);
<span class='self'>self</span>.<span class='ident'>key</span> <span class='op'>=</span> <span class='ident'>new_key</span>;
}
}
<span class='doccomment'>/// A single entropy pool (not public)</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>Pool</span> {
<span class='ident'>state</span>: <span class='ident'>Sha256</span>,
<span class='ident'>count</span>: <span class='ident'>usize</span>
}
<span class='kw'>impl</span> <span class='ident'>Pool</span> {
<span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>Pool</span> {
<span class='ident'>Pool</span> { <span class='ident'>state</span>: <span class='ident'>Sha256</span>::<span class='ident'>new</span>(), <span class='ident'>count</span>: <span class='number'>0</span> }
}
<span class='kw'>fn</span> <span class='ident'>input</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>data</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) {
<span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>input</span>(<span class='ident'>data</span>);
<span class='self'>self</span>.<span class='ident'>count</span> <span class='op'>+=</span> <span class='ident'>data</span>.<span class='ident'>len</span>();
}
<span class='kw'>fn</span> <span class='ident'>result</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>output</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'>state</span>.<span class='ident'>result</span>(<span class='ident'>output</span>);
<span class='comment'>// Double-SHA256 it</span>
<span class='self'>self</span>.<span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>Sha256</span>::<span class='ident'>new</span>();
<span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>input</span>(<span class='ident'>output</span>);
<span class='self'>self</span>.<span class='ident'>state</span>.<span class='ident'>result</span>(<span class='ident'>output</span>);
<span class='comment'>// Clear the pool state</span>
<span class='self'>self</span>.<span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>Sha256</span>::<span class='ident'>new</span>();
<span class='self'>self</span>.<span class='ident'>count</span> <span class='op'>=</span> <span class='number'>0</span>;
}
}
<span class='doccomment'>/// The `Fortuna` CSPRNG (PC 9.5)</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Fortuna</span> {
<span class='ident'>pool</span>: [<span class='ident'>Pool</span>; <span class='ident'>NUM_POOLS</span>],
<span class='ident'>generator</span>: <span class='ident'>FortunaGenerator</span>,
<span class='ident'>reseed_count</span>: <span class='ident'>u32</span>,
<span class='ident'>last_reseed_time</span>: <span class='ident'>f64</span>
}
<span class='kw'>impl</span> <span class='ident'>Fortuna</span> {
<span class='doccomment'>/// Creates a new unseeded `Fortuna` (PC 9.5.4)</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_unseeded</span>() <span class='op'>-></span> <span class='ident'>Fortuna</span> {
<span class='ident'>Fortuna</span> {
<span class='ident'>pool</span>: [<span class='ident'>Pool</span>::<span class='ident'>new</span>(); <span class='ident'>NUM_POOLS</span>],
<span class='ident'>generator</span>: <span class='ident'>FortunaGenerator</span>::<span class='ident'>new</span>(),
<span class='ident'>reseed_count</span>: <span class='number'>0</span>,
<span class='ident'>last_reseed_time</span>: <span class='number'>0.0</span>
}
}
<span class='doccomment'>/// Adds a random event `e` from source `s` to entropy pool `i` (PC 9.5.6)</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>add_random_event</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>s</span>: <span class='ident'>u8</span>, <span class='ident'>i</span>: <span class='ident'>usize</span>, <span class='ident'>e</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>i</span> <span class='op'><=</span> <span class='ident'>NUM_POOLS</span>);
<span class='comment'>// These restrictions (and `s` in [0, 255]) are part of the Fortuna spec.</span>
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>e</span>.<span class='ident'>len</span>() <span class='op'>></span> <span class='number'>0</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>e</span>.<span class='ident'>len</span>() <span class='op'><=</span> <span class='number'>32</span>);
(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>pool</span>[<span class='ident'>i</span>]).<span class='ident'>input</span>(<span class='kw-2'>&</span>[<span class='ident'>s</span>]);
(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>pool</span>[<span class='ident'>i</span>]).<span class='ident'>input</span>(<span class='kw-2'>&</span>[<span class='ident'>e</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u8</span>]);
(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>pool</span>[<span class='ident'>i</span>]).<span class='ident'>input</span>(<span class='ident'>e</span>);
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>Fortuna</span> {
<span class='doccomment'>/// Generate a bunch of random data into `dest` (PC 9.5.5)</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Failure modes</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the RNG has not been seeded, and there is less than</span>
<span class='doccomment'>/// `MIN_POOL_SIZE` bytes of data in the first accumulator</span>
<span class='doccomment'>/// pool, this function will fail the task.</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'>dest</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='comment'>// Reseed if necessary</span>
<span class='kw'>let</span> <span class='ident'>now</span> <span class='op'>=</span> <span class='ident'>precise_time_s</span>();
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>pool</span>[<span class='number'>0</span>].<span class='ident'>count</span> <span class='op'>>=</span> <span class='ident'>MIN_POOL_SIZE</span> <span class='op'>&&</span>
<span class='ident'>now</span> <span class='op'>-</span> <span class='self'>self</span>.<span class='ident'>last_reseed_time</span> <span class='op'>></span> <span class='number'>0.1</span> {
<span class='self'>self</span>.<span class='ident'>reseed_count</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>last_reseed_time</span> <span class='op'>=</span> <span class='ident'>now</span>;
<span class='comment'>// Compute key as Sha256d( key || s )</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>hash</span> <span class='op'>=</span> [<span class='number'>0</span>; (<span class='number'>32</span> <span class='op'>*</span> <span class='ident'>NUM_POOLS</span>)];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>n_pools</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>reseed_count</span> <span class='op'>%</span> (<span class='number'>1</span> <span class='op'><<</span> <span class='ident'>n_pools</span>) <span class='op'>==</span> <span class='number'>0</span> {
(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>pool</span>[<span class='ident'>n_pools</span>]).<span class='ident'>result</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>hash</span>[<span class='ident'>n_pools</span> <span class='op'>*</span> <span class='number'>32</span>..(<span class='ident'>n_pools</span> <span class='op'>+</span> <span class='number'>1</span>) <span class='op'>*</span> <span class='number'>32</span>]);
<span class='ident'>n_pools</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>n_pools</span> <span class='op'><</span> <span class='ident'>NUM_POOLS</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>n_pools</span> <span class='op'><</span> <span class='number'>32</span>); <span class='comment'>// width of counter</span>
}
<span class='self'>self</span>.<span class='ident'>generator</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='ident'>hash</span>[..<span class='ident'>n_pools</span> <span class='op'>*</span> <span class='number'>32</span>]);
}
<span class='comment'>// Fail on unseeded RNG</span>
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>reseed_count</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"rust-crypto: an unseeded Fortuna was asked for random bytes!"</span>);
}
<span class='comment'>// Generate return data</span>
<span class='kw'>for</span> <span class='ident'>dest</span> <span class='kw'>in</span> <span class='ident'>dest</span>.<span class='ident'>chunks_mut</span>(<span class='ident'>MAX_GEN_SIZE</span>) {
<span class='self'>self</span>.<span class='ident'>generator</span>.<span class='ident'>generate_random_data</span>(<span class='ident'>dest</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'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ret</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>4</span>];
<span class='self'>self</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>ret</span>);
<span class='ident'>read_u32_le</span>(<span class='kw-2'>&</span><span class='ident'>ret</span>[..])
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>SeedableRng</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u8</span>]<span class='op'>></span> <span class='kw'>for</span> <span class='ident'>Fortuna</span> {
<span class='kw'>fn</span> <span class='ident'>from_seed</span>(<span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='ident'>Fortuna</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>ret</span>.<span class='ident'>reseed</span>(<span class='ident'>seed</span>);
<span class='ident'>ret</span>
}
<span class='kw'>fn</span> <span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u8</span>]) {
<span class='self'>self</span>.<span class='ident'>reseed_count</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>last_reseed_time</span> <span class='op'>=</span> <span class='ident'>precise_time_s</span>();
<span class='self'>self</span>.<span class='ident'>generator</span>.<span class='ident'>reseed</span>(<span class='ident'>seed</span>);
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>fn</span> <span class='ident'>test_force_reseed</span>(<span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Fortuna</span>) {
<span class='ident'>f</span>.<span class='ident'>last_reseed_time</span> <span class='op'>-=</span> <span class='number'>0.2</span>;
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='kw'>use</span> <span class='ident'>rand</span>::{<span class='ident'>SeedableRng</span>, <span class='ident'>Rng</span>};
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>Fortuna</span>, <span class='ident'>Pool</span>, <span class='ident'>NUM_POOLS</span>, <span class='ident'>test_force_reseed</span>};
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_create_unseeded</span>() {
<span class='kw'>let</span> _: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='attribute'>#[<span class='ident'>should_panic</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_use_unseeded</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>f</span>.<span class='ident'>next_u32</span>();
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='attribute'>#[<span class='ident'>should_panic</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_badly_seeded</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>32</span>]);
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>f</span>.<span class='ident'>next_u32</span>();
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='attribute'>#[<span class='ident'>should_panic</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_too_big_event</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>33</span>]);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_seeded</span>() {
<span class='comment'>// NB for this test I'm just trusting the output of the RNG to be correct.</span>
<span class='comment'>// I do check for some high-level features: changing most anything should</span>
<span class='comment'>// change the output, there should be no tests, etc.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f1</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>][..]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>f1</span>.<span class='ident'>next_u32</span>(), <span class='number'>3369034117</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f2</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f2</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>f2</span>.<span class='ident'>next_u32</span>(), <span class='number'>3369034117</span>);
<span class='comment'>// Ensure reseeding doesn't totally reset the seed. That is, this output should</span>
<span class='comment'>// be different from the above</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f3</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f3</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>]);
<span class='ident'>f3</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span>[<span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>f3</span>.<span class='ident'>next_u32</span>(), <span class='number'>2689122182</span>);
<span class='comment'>// These three should all be different</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f4</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f4</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>32</span>]);
<span class='ident'>f4</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>32</span>]);
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='ident'>f4</span>.<span class='ident'>next_u32</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f5</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f5</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>32</span>]);
<span class='ident'>f5</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>20</span>; <span class='number'>32</span>]);
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='ident'>f5</span>.<span class='ident'>next_u32</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f6</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f6</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>20</span>; <span class='number'>32</span>]);
<span class='ident'>f6</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>10</span>; <span class='number'>32</span>]);
<span class='kw'>let</span> <span class='ident'>z</span> <span class='op'>=</span> <span class='ident'>f6</span>.<span class='ident'>next_u32</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>x</span> <span class='op'>!=</span> <span class='ident'>y</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>y</span> <span class='op'>!=</span> <span class='ident'>z</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>x</span> <span class='op'>!=</span> <span class='ident'>z</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_generator_correctness</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>100</span>];
<span class='comment'>// Expected output as in http://www.seehuhn.de/pages/fortuna</span>
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [ <span class='number'>82</span>, <span class='number'>254</span>, <span class='number'>233</span>, <span class='number'>139</span>, <span class='number'>254</span>, <span class='number'>85</span>, <span class='number'>6</span>, <span class='number'>222</span>, <span class='number'>222</span>, <span class='number'>149</span>,
<span class='number'>120</span>, <span class='number'>35</span>, <span class='number'>173</span>, <span class='number'>71</span>, <span class='number'>89</span>, <span class='number'>232</span>, <span class='number'>51</span>, <span class='number'>182</span>, <span class='number'>252</span>, <span class='number'>139</span>,
<span class='number'>153</span>, <span class='number'>153</span>, <span class='number'>111</span>, <span class='number'>30</span>, <span class='number'>16</span>, <span class='number'>7</span>, <span class='number'>124</span>, <span class='number'>185</span>, <span class='number'>159</span>, <span class='number'>24</span>,
<span class='number'>50</span>, <span class='number'>68</span>, <span class='number'>236</span>, <span class='number'>107</span>, <span class='number'>133</span>, <span class='number'>18</span>, <span class='number'>217</span>, <span class='number'>219</span>, <span class='number'>46</span>, <span class='number'>134</span>,
<span class='number'>169</span>, <span class='number'>156</span>, <span class='number'>211</span>, <span class='number'>74</span>, <span class='number'>163</span>, <span class='number'>17</span>, <span class='number'>100</span>, <span class='number'>173</span>, <span class='number'>26</span>, <span class='number'>70</span>,
<span class='number'>246</span>, <span class='number'>193</span>, <span class='number'>57</span>, <span class='number'>164</span>, <span class='number'>167</span>, <span class='number'>175</span>, <span class='number'>233</span>, <span class='number'>220</span>, <span class='number'>160</span>, <span class='number'>114</span>,
<span class='number'>2</span>, <span class='number'>200</span>, <span class='number'>215</span>, <span class='number'>80</span>, <span class='number'>207</span>, <span class='number'>218</span>, <span class='number'>85</span>, <span class='number'>58</span>, <span class='number'>235</span>, <span class='number'>117</span>,
<span class='number'>177</span>, <span class='number'>223</span>, <span class='number'>87</span>, <span class='number'>192</span>, <span class='number'>50</span>, <span class='number'>251</span>, <span class='number'>61</span>, <span class='number'>65</span>, <span class='number'>141</span>, <span class='number'>100</span>,
<span class='number'>59</span>, <span class='number'>228</span>, <span class='number'>23</span>, <span class='number'>215</span>, <span class='number'>58</span>, <span class='number'>107</span>, <span class='number'>248</span>, <span class='number'>248</span>, <span class='number'>103</span>, <span class='number'>57</span>,
<span class='number'>127</span>, <span class='number'>31</span>, <span class='number'>241</span>, <span class='number'>91</span>, <span class='number'>230</span>, <span class='number'>33</span>, <span class='number'>0</span>, <span class='number'>164</span>, <span class='number'>77</span>, <span class='number'>46</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>][..]);
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>scratch</span> <span class='op'>=</span> [<span class='number'>0</span>; (<span class='number'>1</span> <span class='op'><<</span> <span class='number'>20</span>)];
<span class='ident'>f</span>.<span class='ident'>generator</span>.<span class='ident'>generate_random_data</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>scratch</span>);
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [<span class='number'>122</span>, <span class='number'>164</span>, <span class='number'>26</span>, <span class='number'>67</span>, <span class='number'>102</span>, <span class='number'>65</span>, <span class='number'>30</span>, <span class='number'>217</span>, <span class='number'>219</span>, <span class='number'>113</span>,
<span class='number'>14</span>, <span class='number'>86</span>, <span class='number'>214</span>, <span class='number'>146</span>, <span class='number'>185</span>, <span class='number'>17</span>, <span class='number'>107</span>, <span class='number'>135</span>, <span class='number'>183</span>, <span class='number'>7</span>,
<span class='number'>18</span>, <span class='number'>162</span>, <span class='number'>126</span>, <span class='number'>206</span>, <span class='number'>46</span>, <span class='number'>38</span>, <span class='number'>54</span>, <span class='number'>172</span>, <span class='number'>248</span>, <span class='number'>194</span>,
<span class='number'>118</span>, <span class='number'>84</span>, <span class='number'>162</span>, <span class='number'>146</span>, <span class='number'>83</span>, <span class='number'>156</span>, <span class='number'>152</span>, <span class='number'>96</span>, <span class='number'>192</span>, <span class='number'>15</span>,
<span class='number'>23</span>, <span class='number'>224</span>, <span class='number'>113</span>, <span class='number'>76</span>, <span class='number'>21</span>, <span class='number'>8</span>, <span class='number'>226</span>, <span class='number'>41</span>, <span class='number'>161</span>, <span class='number'>171</span>,
<span class='number'>197</span>, <span class='number'>180</span>, <span class='number'>138</span>, <span class='number'>236</span>, <span class='number'>126</span>, <span class='number'>137</span>, <span class='number'>101</span>, <span class='number'>25</span>, <span class='number'>219</span>, <span class='number'>225</span>,
<span class='number'>3</span>, <span class='number'>189</span>, <span class='number'>16</span>, <span class='number'>242</span>, <span class='number'>33</span>, <span class='number'>91</span>, <span class='number'>34</span>, <span class='number'>27</span>, <span class='number'>8</span>, <span class='number'>171</span>,
<span class='number'>171</span>, <span class='number'>115</span>, <span class='number'>157</span>, <span class='number'>109</span>, <span class='number'>248</span>, <span class='number'>198</span>, <span class='number'>227</span>, <span class='number'>18</span>, <span class='number'>204</span>, <span class='number'>211</span>,
<span class='number'>42</span>, <span class='number'>184</span>, <span class='number'>92</span>, <span class='number'>42</span>, <span class='number'>171</span>, <span class='number'>222</span>, <span class='number'>198</span>, <span class='number'>117</span>, <span class='number'>162</span>, <span class='number'>134</span>,
<span class='number'>116</span>, <span class='number'>109</span>, <span class='number'>77</span>, <span class='number'>195</span>, <span class='number'>187</span>, <span class='number'>139</span>, <span class='number'>37</span>, <span class='number'>78</span>, <span class='number'>224</span>, <span class='number'>63</span>];
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
<span class='ident'>f</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span>[<span class='number'>5</span>]);
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [<span class='number'>217</span>, <span class='number'>168</span>, <span class='number'>141</span>, <span class='number'>167</span>, <span class='number'>46</span>, <span class='number'>9</span>, <span class='number'>218</span>, <span class='number'>188</span>, <span class='number'>98</span>, <span class='number'>124</span>,
<span class='number'>109</span>, <span class='number'>128</span>, <span class='number'>242</span>, <span class='number'>22</span>, <span class='number'>189</span>, <span class='number'>120</span>, <span class='number'>180</span>, <span class='number'>124</span>, <span class='number'>15</span>, <span class='number'>192</span>,
<span class='number'>116</span>, <span class='number'>149</span>, <span class='number'>211</span>, <span class='number'>136</span>, <span class='number'>253</span>, <span class='number'>132</span>, <span class='number'>60</span>, <span class='number'>3</span>, <span class='number'>29</span>, <span class='number'>250</span>,
<span class='number'>95</span>, <span class='number'>66</span>, <span class='number'>133</span>, <span class='number'>195</span>, <span class='number'>37</span>, <span class='number'>78</span>, <span class='number'>242</span>, <span class='number'>255</span>, <span class='number'>160</span>, <span class='number'>209</span>,
<span class='number'>185</span>, <span class='number'>106</span>, <span class='number'>68</span>, <span class='number'>105</span>, <span class='number'>83</span>, <span class='number'>145</span>, <span class='number'>165</span>, <span class='number'>72</span>, <span class='number'>179</span>, <span class='number'>167</span>,
<span class='number'>53</span>, <span class='number'>254</span>, <span class='number'>183</span>, <span class='number'>251</span>, <span class='number'>128</span>, <span class='number'>69</span>, <span class='number'>78</span>, <span class='number'>156</span>, <span class='number'>219</span>, <span class='number'>26</span>,
<span class='number'>124</span>, <span class='number'>202</span>, <span class='number'>35</span>, <span class='number'>9</span>, <span class='number'>174</span>, <span class='number'>167</span>, <span class='number'>41</span>, <span class='number'>128</span>, <span class='number'>184</span>, <span class='number'>25</span>,
<span class='number'>2</span>, <span class='number'>1</span>, <span class='number'>63</span>, <span class='number'>142</span>, <span class='number'>205</span>, <span class='number'>162</span>, <span class='number'>69</span>, <span class='number'>68</span>, <span class='number'>207</span>, <span class='number'>251</span>,
<span class='number'>101</span>, <span class='number'>10</span>, <span class='number'>29</span>, <span class='number'>33</span>, <span class='number'>133</span>, <span class='number'>87</span>, <span class='number'>189</span>, <span class='number'>36</span>, <span class='number'>229</span>, <span class='number'>56</span>,
<span class='number'>17</span>, <span class='number'>100</span>, <span class='number'>138</span>, <span class='number'>49</span>, <span class='number'>79</span>, <span class='number'>239</span>, <span class='number'>210</span>, <span class='number'>189</span>, <span class='number'>141</span>, <span class='number'>46</span>];
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_accumulator_correctness</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>100</span>];
<span class='comment'>// Expected output from experiments with pycryto</span>
<span class='comment'>// Note that this does not match the results for the Go implementation</span>
<span class='comment'>// as described at http://www.seehuhn.de/pages/fortuna ... I believe</span>
<span class='comment'>// this is because the author there is reusing some Fortuna state from</span>
<span class='comment'>// the previous test. These results agree with pycrypto on a fresh slate</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>Fortuna</span>::<span class='ident'>new_unseeded</span>();
<span class='ident'>f</span>.<span class='ident'>pool</span> <span class='op'>=</span> [<span class='ident'>Pool</span>::<span class='ident'>new</span>(); <span class='ident'>NUM_POOLS</span>];
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>]);
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>]);
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>32</span> {
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>1</span>, <span class='ident'>i</span>, <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>2</span>]);
}
<span class='comment'>// from Crypto.Random.Fortuna import FortunaAccumulator</span>
<span class='comment'>// x = FortunaAccumulator.FortunaAccumulator()</span>
<span class='comment'>// x.add_random_event(0, 0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")</span>
<span class='comment'>// x.add_random_event(0, 0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")</span>
<span class='comment'>// x.add_random_event(1, 0, "\1\2")</span>
<span class='comment'>// x.add_random_event(1, 1, "\1\2")</span>
<span class='comment'>// print list(bytearray(x.random_data(100)))</span>
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [ <span class='number'>21</span>, <span class='number'>42</span>, <span class='number'>103</span>, <span class='number'>180</span>, <span class='number'>211</span>, <span class='number'>46</span>, <span class='number'>177</span>, <span class='number'>231</span>, <span class='number'>172</span>, <span class='number'>210</span>,
<span class='number'>109</span>, <span class='number'>198</span>, <span class='number'>34</span>, <span class='number'>40</span>, <span class='number'>245</span>, <span class='number'>199</span>, <span class='number'>76</span>, <span class='number'>114</span>, <span class='number'>105</span>, <span class='number'>185</span>,
<span class='number'>186</span>, <span class='number'>112</span>, <span class='number'>183</span>, <span class='number'>213</span>, <span class='number'>19</span>, <span class='number'>72</span>, <span class='number'>186</span>, <span class='number'>26</span>, <span class='number'>182</span>, <span class='number'>211</span>,
<span class='number'>254</span>, <span class='number'>88</span>, <span class='number'>67</span>, <span class='number'>142</span>, <span class='number'>246</span>, <span class='number'>102</span>, <span class='number'>80</span>, <span class='number'>93</span>, <span class='number'>144</span>, <span class='number'>152</span>,
<span class='number'>123</span>, <span class='number'>191</span>, <span class='number'>168</span>, <span class='number'>26</span>, <span class='number'>21</span>, <span class='number'>194</span>, <span class='number'>69</span>, <span class='number'>214</span>, <span class='number'>249</span>, <span class='number'>80</span>,
<span class='number'>182</span>, <span class='number'>165</span>, <span class='number'>203</span>, <span class='number'>69</span>, <span class='number'>134</span>, <span class='number'>140</span>, <span class='number'>11</span>, <span class='number'>208</span>, <span class='number'>50</span>, <span class='number'>175</span>,
<span class='number'>180</span>, <span class='number'>210</span>, <span class='number'>110</span>, <span class='number'>119</span>, <span class='number'>3</span>, <span class='number'>75</span>, <span class='number'>1</span>, <span class='number'>8</span>, <span class='number'>5</span>, <span class='number'>142</span>,
<span class='number'>226</span>, <span class='number'>168</span>, <span class='number'>179</span>, <span class='number'>246</span>, <span class='number'>82</span>, <span class='number'>42</span>, <span class='number'>223</span>, <span class='number'>239</span>, <span class='number'>201</span>, <span class='number'>23</span>,
<span class='number'>28</span>, <span class='number'>30</span>, <span class='number'>195</span>, <span class='number'>195</span>, <span class='number'>9</span>, <span class='number'>154</span>, <span class='number'>31</span>, <span class='number'>172</span>, <span class='number'>209</span>, <span class='number'>232</span>,
<span class='number'>238</span>, <span class='number'>111</span>, <span class='number'>75</span>, <span class='number'>251</span>, <span class='number'>196</span>, <span class='number'>43</span>, <span class='number'>217</span>, <span class='number'>241</span>, <span class='number'>93</span>, <span class='number'>237</span>];
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
<span class='comment'>// Immediately (less than 100ms)</span>
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>]);
<span class='ident'>f</span>.<span class='ident'>add_random_event</span>(<span class='number'>0</span>, <span class='number'>0</span>, <span class='kw-2'>&</span>[<span class='number'>0</span>; <span class='number'>32</span>]);
<span class='comment'>// x.add_random_event(0, 0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")</span>
<span class='comment'>// x.add_random_event(0, 0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")</span>
<span class='comment'>// print list(bytearray(x.random_data(100)))</span>
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [<span class='number'>101</span>, <span class='number'>123</span>, <span class='number'>175</span>, <span class='number'>157</span>, <span class='number'>142</span>, <span class='number'>202</span>, <span class='number'>211</span>, <span class='number'>47</span>, <span class='number'>149</span>, <span class='number'>214</span>,
<span class='number'>135</span>, <span class='number'>249</span>, <span class='number'>148</span>, <span class='number'>19</span>, <span class='number'>50</span>, <span class='number'>116</span>, <span class='number'>169</span>, <span class='number'>188</span>, <span class='number'>240</span>, <span class='number'>218</span>,
<span class='number'>91</span>, <span class='number'>62</span>, <span class='number'>35</span>, <span class='number'>44</span>, <span class='number'>142</span>, <span class='number'>108</span>, <span class='number'>95</span>, <span class='number'>20</span>, <span class='number'>37</span>, <span class='number'>185</span>,
<span class='number'>19</span>, <span class='number'>121</span>, <span class='number'>128</span>, <span class='number'>231</span>, <span class='number'>213</span>, <span class='number'>23</span>, <span class='number'>94</span>, <span class='number'>147</span>, <span class='number'>14</span>, <span class='number'>41</span>,
<span class='number'>199</span>, <span class='number'>253</span>, <span class='number'>246</span>, <span class='number'>14</span>, <span class='number'>230</span>, <span class='number'>152</span>, <span class='number'>11</span>, <span class='number'>17</span>, <span class='number'>118</span>, <span class='number'>254</span>,
<span class='number'>96</span>, <span class='number'>251</span>, <span class='number'>171</span>, <span class='number'>115</span>, <span class='number'>66</span>, <span class='number'>21</span>, <span class='number'>196</span>, <span class='number'>164</span>, <span class='number'>82</span>, <span class='number'>6</span>,
<span class='number'>139</span>, <span class='number'>238</span>, <span class='number'>135</span>, <span class='number'>22</span>, <span class='number'>179</span>, <span class='number'>6</span>, <span class='number'>6</span>, <span class='number'>252</span>, <span class='number'>115</span>, <span class='number'>87</span>,
<span class='number'>19</span>, <span class='number'>167</span>, <span class='number'>56</span>, <span class='number'>192</span>, <span class='number'>140</span>, <span class='number'>93</span>, <span class='number'>132</span>, <span class='number'>78</span>, <span class='number'>22</span>, <span class='number'>16</span>,
<span class='number'>114</span>, <span class='number'>68</span>, <span class='number'>123</span>, <span class='number'>200</span>, <span class='number'>37</span>, <span class='number'>183</span>, <span class='number'>163</span>, <span class='number'>224</span>, <span class='number'>201</span>, <span class='number'>155</span>,
<span class='number'>233</span>, <span class='number'>71</span>, <span class='number'>111</span>, <span class='number'>26</span>, <span class='number'>8</span>, <span class='number'>114</span>, <span class='number'>232</span>, <span class='number'>181</span>, <span class='number'>13</span>, <span class='number'>51</span>];
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
<span class='comment'>// Simulate more than 100 ms passing</span>
<span class='ident'>test_force_reseed</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>f</span>);
<span class='comment'>// time.sleep(0.2)</span>
<span class='comment'>// print list(bytearray(x.random_data(100)))</span>
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> [ <span class='number'>62</span>, <span class='number'>147</span>, <span class='number'>205</span>, <span class='number'>228</span>, <span class='number'>22</span>, <span class='number'>3</span>, <span class='number'>225</span>, <span class='number'>217</span>, <span class='number'>211</span>, <span class='number'>202</span>,
<span class='number'>49</span>, <span class='number'>148</span>, <span class='number'>236</span>, <span class='number'>125</span>, <span class='number'>132</span>, <span class='number'>43</span>, <span class='number'>25</span>, <span class='number'>177</span>, <span class='number'>172</span>, <span class='number'>93</span>,
<span class='number'>98</span>, <span class='number'>177</span>, <span class='number'>112</span>, <span class='number'>160</span>, <span class='number'>76</span>, <span class='number'>101</span>, <span class='number'>60</span>, <span class='number'>98</span>, <span class='number'>225</span>, <span class='number'>9</span>,
<span class='number'>223</span>, <span class='number'>120</span>, <span class='number'>161</span>, <span class='number'>98</span>, <span class='number'>173</span>, <span class='number'>178</span>, <span class='number'>71</span>, <span class='number'>15</span>, <span class='number'>90</span>, <span class='number'>153</span>,
<span class='number'>64</span>, <span class='number'>179</span>, <span class='number'>143</span>, <span class='number'>22</span>, <span class='number'>43</span>, <span class='number'>165</span>, <span class='number'>87</span>, <span class='number'>147</span>, <span class='number'>177</span>, <span class='number'>128</span>,
<span class='number'>21</span>, <span class='number'>105</span>, <span class='number'>214</span>, <span class='number'>197</span>, <span class='number'>224</span>, <span class='number'>187</span>, <span class='number'>22</span>, <span class='number'>139</span>, <span class='number'>16</span>, <span class='number'>153</span>,
<span class='number'>251</span>, <span class='number'>48</span>, <span class='number'>244</span>, <span class='number'>87</span>, <span class='number'>10</span>, <span class='number'>104</span>, <span class='number'>119</span>, <span class='number'>179</span>, <span class='number'>27</span>, <span class='number'>255</span>,
<span class='number'>67</span>, <span class='number'>148</span>, <span class='number'>192</span>, <span class='number'>52</span>, <span class='number'>147</span>, <span class='number'>216</span>, <span class='number'>79</span>, <span class='number'>204</span>, <span class='number'>106</span>, <span class='number'>112</span>,
<span class='number'>238</span>, <span class='number'>0</span>, <span class='number'>239</span>, <span class='number'>99</span>, <span class='number'>159</span>, <span class='number'>96</span>, <span class='number'>184</span>, <span class='number'>90</span>, <span class='number'>54</span>, <span class='number'>122</span>,
<span class='number'>184</span>, <span class='number'>241</span>, <span class='number'>221</span>, <span class='number'>151</span>, <span class='number'>169</span>, <span class='number'>29</span>, <span class='number'>197</span>, <span class='number'>45</span>, <span class='number'>80</span>, <span class='number'>6</span>];
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='ident'>expected</span>[..], <span class='kw-2'>&</span><span class='ident'>output</span>[..]);
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>test</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"with-bench"</span>))]</span>
<span class='kw'>mod</span> <span class='ident'>bench</span> {
<span class='kw'>use</span> <span class='ident'>rand</span>::{<span class='ident'>SeedableRng</span>, <span class='ident'>Rng</span>};
<span class='kw'>use</span> <span class='ident'>test</span>::<span class='ident'>Bencher</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>Fortuna</span>;
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>fortuna_new_32</span>(<span class='ident'>bh</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>100</span>; <span class='number'>64</span>][..]);
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>f</span>.<span class='ident'>next_u32</span>();
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='number'>4</span>;
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>fortuna_new_64</span>(<span class='ident'>bh</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>100</span>; <span class='number'>64</span>][..]);
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>f</span>.<span class='ident'>next_u64</span>();
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='number'>8</span>;
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>fortuna_new_1k</span>(<span class='ident'>bh</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>100</span>; <span class='number'>64</span>][..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>bytes</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>1024</span>];
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>bytes</span>);
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='ident'>bytes</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u64</span>;
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>fortuna_new_64k</span>(<span class='ident'>bh</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Bencher</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span>: <span class='ident'>Fortuna</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span>[<span class='number'>100</span>; <span class='number'>64</span>][..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>bytes</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>65536</span>];
<span class='ident'>bh</span>.<span class='ident'>iter</span>( <span class='op'>||</span> {
<span class='ident'>f</span>.<span class='ident'>fill_bytes</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>bytes</span>);
});
<span class='ident'>bh</span>.<span class='ident'>bytes</span> <span class='op'>=</span> <span class='ident'>bytes</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u64</span>;
}
}
</pre>
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