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-rw-r--r--rand/src/prng/chacha.rs321
-rw-r--r--rand/src/prng/isaac.rs328
-rw-r--r--rand/src/prng/isaac64.rs340
-rw-r--r--rand/src/prng/mod.rs74
-rw-r--r--rand/src/prng/xorshift.rs101
5 files changed, 30 insertions, 1134 deletions
diff --git a/rand/src/prng/chacha.rs b/rand/src/prng/chacha.rs
deleted file mode 100644
index a73e8e7..0000000
--- a/rand/src/prng/chacha.rs
+++ /dev/null
@@ -1,321 +0,0 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The ChaCha random number generator.
-
-use core::num::Wrapping as w;
-use {Rng, SeedableRng, Rand};
-
-#[allow(bad_style)]
-type w32 = w<u32>;
-
-const KEY_WORDS : usize = 8; // 8 words for the 256-bit key
-const STATE_WORDS : usize = 16;
-const CHACHA_ROUNDS: u32 = 20; // Cryptographically secure from 8 upwards as of this writing
-
-/// A random number generator that uses the ChaCha20 algorithm [1].
-///
-/// The ChaCha algorithm is widely accepted as suitable for
-/// cryptographic purposes, but this implementation has not been
-/// verified as such. Prefer a generator like `OsRng` that defers to
-/// the operating system for cases that need high security.
-///
-/// [1]: D. J. Bernstein, [*ChaCha, a variant of
-/// Salsa20*](http://cr.yp.to/chacha.html)
-#[derive(Copy, Clone, Debug)]
-pub struct ChaChaRng {
- buffer: [w32; STATE_WORDS], // Internal buffer of output
- state: [w32; STATE_WORDS], // Initial state
- index: usize, // Index into state
-}
-
-static EMPTY: ChaChaRng = ChaChaRng {
- buffer: [w(0); STATE_WORDS],
- state: [w(0); STATE_WORDS],
- index: STATE_WORDS
-};
-
-
-macro_rules! quarter_round{
- ($a: expr, $b: expr, $c: expr, $d: expr) => {{
- $a = $a + $b; $d = $d ^ $a; $d = w($d.0.rotate_left(16));
- $c = $c + $d; $b = $b ^ $c; $b = w($b.0.rotate_left(12));
- $a = $a + $b; $d = $d ^ $a; $d = w($d.0.rotate_left( 8));
- $c = $c + $d; $b = $b ^ $c; $b = w($b.0.rotate_left( 7));
- }}
-}
-
-macro_rules! double_round{
- ($x: expr) => {{
- // Column round
- quarter_round!($x[ 0], $x[ 4], $x[ 8], $x[12]);
- quarter_round!($x[ 1], $x[ 5], $x[ 9], $x[13]);
- quarter_round!($x[ 2], $x[ 6], $x[10], $x[14]);
- quarter_round!($x[ 3], $x[ 7], $x[11], $x[15]);
- // Diagonal round
- quarter_round!($x[ 0], $x[ 5], $x[10], $x[15]);
- quarter_round!($x[ 1], $x[ 6], $x[11], $x[12]);
- quarter_round!($x[ 2], $x[ 7], $x[ 8], $x[13]);
- quarter_round!($x[ 3], $x[ 4], $x[ 9], $x[14]);
- }}
-}
-
-#[inline]
-fn core(output: &mut [w32; STATE_WORDS], input: &[w32; STATE_WORDS]) {
- *output = *input;
-
- for _ in 0..CHACHA_ROUNDS / 2 {
- double_round!(output);
- }
-
- for i in 0..STATE_WORDS {
- output[i] = output[i] + input[i];
- }
-}
-
-impl ChaChaRng {
-
- /// Create an ChaCha random number generator using the default
- /// fixed key of 8 zero words.
- ///
- /// # Examples
- ///
- /// ```rust
- /// use rand::{Rng, ChaChaRng};
- ///
- /// let mut ra = ChaChaRng::new_unseeded();
- /// println!("{:?}", ra.next_u32());
- /// println!("{:?}", ra.next_u32());
- /// ```
- ///
- /// Since this equivalent to a RNG with a fixed seed, repeated executions
- /// of an unseeded RNG will produce the same result. This code sample will
- /// consistently produce:
- ///
- /// - 2917185654
- /// - 2419978656
- pub fn new_unseeded() -> ChaChaRng {
- let mut rng = EMPTY;
- rng.init(&[0; KEY_WORDS]);
- rng
- }
-
- /// Sets the internal 128-bit ChaCha counter to
- /// a user-provided value. This permits jumping
- /// arbitrarily ahead (or backwards) in the pseudorandom stream.
- ///
- /// Since the nonce words are used to extend the counter to 128 bits,
- /// users wishing to obtain the conventional ChaCha pseudorandom stream
- /// associated with a particular nonce can call this function with
- /// arguments `0, desired_nonce`.
- ///
- /// # Examples
- ///
- /// ```rust
- /// use rand::{Rng, ChaChaRng};
- ///
- /// let mut ra = ChaChaRng::new_unseeded();
- /// ra.set_counter(0u64, 1234567890u64);
- /// println!("{:?}", ra.next_u32());
- /// println!("{:?}", ra.next_u32());
- /// ```
- pub fn set_counter(&mut self, counter_low: u64, counter_high: u64) {
- self.state[12] = w((counter_low >> 0) as u32);
- self.state[13] = w((counter_low >> 32) as u32);
- self.state[14] = w((counter_high >> 0) as u32);
- self.state[15] = w((counter_high >> 32) as u32);
- self.index = STATE_WORDS; // force recomputation
- }
-
- /// Initializes `self.state` with the appropriate key and constants
- ///
- /// We deviate slightly from the ChaCha specification regarding
- /// the nonce, which is used to extend the counter to 128 bits.
- /// This is provably as strong as the original cipher, though,
- /// since any distinguishing attack on our variant also works
- /// against ChaCha with a chosen-nonce. See the XSalsa20 [1]
- /// security proof for a more involved example of this.
- ///
- /// The modified word layout is:
- /// ```text
- /// constant constant constant constant
- /// key key key key
- /// key key key key
- /// counter counter counter counter
- /// ```
- /// [1]: Daniel J. Bernstein. [*Extending the Salsa20
- /// nonce.*](http://cr.yp.to/papers.html#xsalsa)
- fn init(&mut self, key: &[u32; KEY_WORDS]) {
- self.state[0] = w(0x61707865);
- self.state[1] = w(0x3320646E);
- self.state[2] = w(0x79622D32);
- self.state[3] = w(0x6B206574);
-
- for i in 0..KEY_WORDS {
- self.state[4+i] = w(key[i]);
- }
-
- self.state[12] = w(0);
- self.state[13] = w(0);
- self.state[14] = w(0);
- self.state[15] = w(0);
-
- self.index = STATE_WORDS;
- }
-
- /// Refill the internal output buffer (`self.buffer`)
- fn update(&mut self) {
- core(&mut self.buffer, &self.state);
- self.index = 0;
- // update 128-bit counter
- self.state[12] = self.state[12] + w(1);
- if self.state[12] != w(0) { return };
- self.state[13] = self.state[13] + w(1);
- if self.state[13] != w(0) { return };
- self.state[14] = self.state[14] + w(1);
- if self.state[14] != w(0) { return };
- self.state[15] = self.state[15] + w(1);
- }
-}
-
-impl Rng for ChaChaRng {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- if self.index == STATE_WORDS {
- self.update();
- }
-
- let value = self.buffer[self.index % STATE_WORDS];
- self.index += 1;
- value.0
- }
-}
-
-impl<'a> SeedableRng<&'a [u32]> for ChaChaRng {
-
- fn reseed(&mut self, seed: &'a [u32]) {
- // reset state
- self.init(&[0u32; KEY_WORDS]);
- // set key in place
- let key = &mut self.state[4 .. 4+KEY_WORDS];
- for (k, s) in key.iter_mut().zip(seed.iter()) {
- *k = w(*s);
- }
- }
-
- /// Create a ChaCha generator from a seed,
- /// obtained from a variable-length u32 array.
- /// Only up to 8 words are used; if less than 8
- /// words are used, the remaining are set to zero.
- fn from_seed(seed: &'a [u32]) -> ChaChaRng {
- let mut rng = EMPTY;
- rng.reseed(seed);
- rng
- }
-}
-
-impl Rand for ChaChaRng {
- fn rand<R: Rng>(other: &mut R) -> ChaChaRng {
- let mut key : [u32; KEY_WORDS] = [0; KEY_WORDS];
- for word in key.iter_mut() {
- *word = other.gen();
- }
- SeedableRng::from_seed(&key[..])
- }
-}
-
-
-#[cfg(test)]
-mod test {
- use {Rng, SeedableRng};
- use super::ChaChaRng;
-
- #[test]
- fn test_rng_rand_seeded() {
- let s = ::test::rng().gen_iter::<u32>().take(8).collect::<Vec<u32>>();
- let mut ra: ChaChaRng = SeedableRng::from_seed(&s[..]);
- let mut rb: ChaChaRng = SeedableRng::from_seed(&s[..]);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_seeded() {
- let seed : &[_] = &[0,1,2,3,4,5,6,7];
- let mut ra: ChaChaRng = SeedableRng::from_seed(seed);
- let mut rb: ChaChaRng = SeedableRng::from_seed(seed);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_reseed() {
- let s = ::test::rng().gen_iter::<u32>().take(8).collect::<Vec<u32>>();
- let mut r: ChaChaRng = SeedableRng::from_seed(&s[..]);
- let string1: String = r.gen_ascii_chars().take(100).collect();
-
- r.reseed(&s);
-
- let string2: String = r.gen_ascii_chars().take(100).collect();
- assert_eq!(string1, string2);
- }
-
- #[test]
- fn test_rng_true_values() {
- // Test vectors 1 and 2 from
- // http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04
- let seed : &[_] = &[0u32; 8];
- let mut ra: ChaChaRng = SeedableRng::from_seed(seed);
-
- let v = (0..16).map(|_| ra.next_u32()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(0xade0b876, 0x903df1a0, 0xe56a5d40, 0x28bd8653,
- 0xb819d2bd, 0x1aed8da0, 0xccef36a8, 0xc70d778b,
- 0x7c5941da, 0x8d485751, 0x3fe02477, 0x374ad8b8,
- 0xf4b8436a, 0x1ca11815, 0x69b687c3, 0x8665eeb2));
-
- let v = (0..16).map(|_| ra.next_u32()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(0xbee7079f, 0x7a385155, 0x7c97ba98, 0x0d082d73,
- 0xa0290fcb, 0x6965e348, 0x3e53c612, 0xed7aee32,
- 0x7621b729, 0x434ee69c, 0xb03371d5, 0xd539d874,
- 0x281fed31, 0x45fb0a51, 0x1f0ae1ac, 0x6f4d794b));
-
-
- let seed : &[_] = &[0,1,2,3,4,5,6,7];
- let mut ra: ChaChaRng = SeedableRng::from_seed(seed);
-
- // Store the 17*i-th 32-bit word,
- // i.e., the i-th word of the i-th 16-word block
- let mut v : Vec<u32> = Vec::new();
- for _ in 0..16 {
- v.push(ra.next_u32());
- for _ in 0..16 {
- ra.next_u32();
- }
- }
-
- assert_eq!(v,
- vec!(0xf225c81a, 0x6ab1be57, 0x04d42951, 0x70858036,
- 0x49884684, 0x64efec72, 0x4be2d186, 0x3615b384,
- 0x11cfa18e, 0xd3c50049, 0x75c775f6, 0x434c6530,
- 0x2c5bad8f, 0x898881dc, 0x5f1c86d9, 0xc1f8e7f4));
- }
-
- #[test]
- fn test_rng_clone() {
- let seed : &[_] = &[0u32; 8];
- let mut rng: ChaChaRng = SeedableRng::from_seed(seed);
- let mut clone = rng.clone();
- for _ in 0..16 {
- assert_eq!(rng.next_u64(), clone.next_u64());
- }
- }
-}
diff --git a/rand/src/prng/isaac.rs b/rand/src/prng/isaac.rs
deleted file mode 100644
index cf5eb67..0000000
--- a/rand/src/prng/isaac.rs
+++ /dev/null
@@ -1,328 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The ISAAC random number generator.
-
-#![allow(non_camel_case_types)]
-
-use core::slice;
-use core::iter::repeat;
-use core::num::Wrapping as w;
-use core::fmt;
-
-use {Rng, SeedableRng, Rand};
-
-#[allow(bad_style)]
-type w32 = w<u32>;
-
-const RAND_SIZE_LEN: usize = 8;
-const RAND_SIZE: u32 = 1 << RAND_SIZE_LEN;
-const RAND_SIZE_USIZE: usize = 1 << RAND_SIZE_LEN;
-
-/// A random number generator that uses the ISAAC algorithm[1].
-///
-/// The ISAAC algorithm is generally accepted as suitable for
-/// cryptographic purposes, but this implementation has not be
-/// verified as such. Prefer a generator like `OsRng` that defers to
-/// the operating system for cases that need high security.
-///
-/// [1]: Bob Jenkins, [*ISAAC: A fast cryptographic random number
-/// generator*](http://www.burtleburtle.net/bob/rand/isaacafa.html)
-#[derive(Copy)]
-pub struct IsaacRng {
- cnt: u32,
- rsl: [w32; RAND_SIZE_USIZE],
- mem: [w32; RAND_SIZE_USIZE],
- a: w32,
- b: w32,
- c: w32,
-}
-
-static EMPTY: IsaacRng = IsaacRng {
- cnt: 0,
- rsl: [w(0); RAND_SIZE_USIZE],
- mem: [w(0); RAND_SIZE_USIZE],
- a: w(0), b: w(0), c: w(0),
-};
-
-impl IsaacRng {
-
- /// Create an ISAAC random number generator using the default
- /// fixed seed.
- pub fn new_unseeded() -> IsaacRng {
- let mut rng = EMPTY;
- rng.init(false);
- rng
- }
-
- /// Initialises `self`. If `use_rsl` is true, then use the current value
- /// of `rsl` as a seed, otherwise construct one algorithmically (not
- /// randomly).
- fn init(&mut self, use_rsl: bool) {
- let mut a = w(0x9e3779b9);
- let mut b = a;
- let mut c = a;
- let mut d = a;
- let mut e = a;
- let mut f = a;
- let mut g = a;
- let mut h = a;
-
- macro_rules! mix {
- () => {{
- a=a^(b<<11); d=d+a; b=b+c;
- b=b^(c>>2); e=e+b; c=c+d;
- c=c^(d<<8); f=f+c; d=d+e;
- d=d^(e>>16); g=g+d; e=e+f;
- e=e^(f<<10); h=h+e; f=f+g;
- f=f^(g>>4); a=a+f; g=g+h;
- g=g^(h<<8); b=b+g; h=h+a;
- h=h^(a>>9); c=c+h; a=a+b;
- }}
- }
-
- for _ in 0..4 {
- mix!();
- }
-
- if use_rsl {
- macro_rules! memloop {
- ($arr:expr) => {{
- for i in (0..RAND_SIZE_USIZE/8).map(|i| i * 8) {
- a=a+$arr[i ]; b=b+$arr[i+1];
- c=c+$arr[i+2]; d=d+$arr[i+3];
- e=e+$arr[i+4]; f=f+$arr[i+5];
- g=g+$arr[i+6]; h=h+$arr[i+7];
- mix!();
- self.mem[i ]=a; self.mem[i+1]=b;
- self.mem[i+2]=c; self.mem[i+3]=d;
- self.mem[i+4]=e; self.mem[i+5]=f;
- self.mem[i+6]=g; self.mem[i+7]=h;
- }
- }}
- }
-
- memloop!(self.rsl);
- memloop!(self.mem);
- } else {
- for i in (0..RAND_SIZE_USIZE/8).map(|i| i * 8) {
- mix!();
- self.mem[i ]=a; self.mem[i+1]=b;
- self.mem[i+2]=c; self.mem[i+3]=d;
- self.mem[i+4]=e; self.mem[i+5]=f;
- self.mem[i+6]=g; self.mem[i+7]=h;
- }
- }
-
- self.isaac();
- }
-
- /// Refills the output buffer (`self.rsl`)
- #[inline]
- fn isaac(&mut self) {
- self.c = self.c + w(1);
- // abbreviations
- let mut a = self.a;
- let mut b = self.b + self.c;
-
- const MIDPOINT: usize = RAND_SIZE_USIZE / 2;
-
- macro_rules! ind {
- ($x:expr) => ( self.mem[($x >> 2usize).0 as usize & (RAND_SIZE_USIZE - 1)] )
- }
-
- let r = [(0, MIDPOINT), (MIDPOINT, 0)];
- for &(mr_offset, m2_offset) in r.iter() {
-
- macro_rules! rngstepp {
- ($j:expr, $shift:expr) => {{
- let base = $j;
- let mix = a << $shift;
-
- let x = self.mem[base + mr_offset];
- a = (a ^ mix) + self.mem[base + m2_offset];
- let y = ind!(x) + a + b;
- self.mem[base + mr_offset] = y;
-
- b = ind!(y >> RAND_SIZE_LEN) + x;
- self.rsl[base + mr_offset] = b;
- }}
- }
-
- macro_rules! rngstepn {
- ($j:expr, $shift:expr) => {{
- let base = $j;
- let mix = a >> $shift;
-
- let x = self.mem[base + mr_offset];
- a = (a ^ mix) + self.mem[base + m2_offset];
- let y = ind!(x) + a + b;
- self.mem[base + mr_offset] = y;
-
- b = ind!(y >> RAND_SIZE_LEN) + x;
- self.rsl[base + mr_offset] = b;
- }}
- }
-
- for i in (0..MIDPOINT/4).map(|i| i * 4) {
- rngstepp!(i + 0, 13);
- rngstepn!(i + 1, 6);
- rngstepp!(i + 2, 2);
- rngstepn!(i + 3, 16);
- }
- }
-
- self.a = a;
- self.b = b;
- self.cnt = RAND_SIZE;
- }
-}
-
-// Cannot be derived because [u32; 256] does not implement Clone
-impl Clone for IsaacRng {
- fn clone(&self) -> IsaacRng {
- *self
- }
-}
-
-impl Rng for IsaacRng {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- if self.cnt == 0 {
- // make some more numbers
- self.isaac();
- }
- self.cnt -= 1;
-
- // self.cnt is at most RAND_SIZE, but that is before the
- // subtraction above. We want to index without bounds
- // checking, but this could lead to incorrect code if someone
- // misrefactors, so we check, sometimes.
- //
- // (Changes here should be reflected in Isaac64Rng.next_u64.)
- debug_assert!(self.cnt < RAND_SIZE);
-
- // (the % is cheaply telling the optimiser that we're always
- // in bounds, without unsafe. NB. this is a power of two, so
- // it optimises to a bitwise mask).
- self.rsl[(self.cnt % RAND_SIZE) as usize].0
- }
-}
-
-impl<'a> SeedableRng<&'a [u32]> for IsaacRng {
- fn reseed(&mut self, seed: &'a [u32]) {
- // make the seed into [seed[0], seed[1], ..., seed[seed.len()
- // - 1], 0, 0, ...], to fill rng.rsl.
- let seed_iter = seed.iter().map(|&x| x).chain(repeat(0u32));
-
- for (rsl_elem, seed_elem) in self.rsl.iter_mut().zip(seed_iter) {
- *rsl_elem = w(seed_elem);
- }
- self.cnt = 0;
- self.a = w(0);
- self.b = w(0);
- self.c = w(0);
-
- self.init(true);
- }
-
- /// Create an ISAAC random number generator with a seed. This can
- /// be any length, although the maximum number of elements used is
- /// 256 and any more will be silently ignored. A generator
- /// constructed with a given seed will generate the same sequence
- /// of values as all other generators constructed with that seed.
- fn from_seed(seed: &'a [u32]) -> IsaacRng {
- let mut rng = EMPTY;
- rng.reseed(seed);
- rng
- }
-}
-
-impl Rand for IsaacRng {
- fn rand<R: Rng>(other: &mut R) -> IsaacRng {
- let mut ret = EMPTY;
- unsafe {
- let ptr = ret.rsl.as_mut_ptr() as *mut u8;
-
- let slice = slice::from_raw_parts_mut(ptr, RAND_SIZE_USIZE * 4);
- other.fill_bytes(slice);
- }
- ret.cnt = 0;
- ret.a = w(0);
- ret.b = w(0);
- ret.c = w(0);
-
- ret.init(true);
- return ret;
- }
-}
-
-impl fmt::Debug for IsaacRng {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "IsaacRng {{}}")
- }
-}
-
-#[cfg(test)]
-mod test {
- use {Rng, SeedableRng};
- use super::IsaacRng;
-
- #[test]
- fn test_rng_32_rand_seeded() {
- let s = ::test::rng().gen_iter::<u32>().take(256).collect::<Vec<u32>>();
- let mut ra: IsaacRng = SeedableRng::from_seed(&s[..]);
- let mut rb: IsaacRng = SeedableRng::from_seed(&s[..]);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_32_seeded() {
- let seed: &[_] = &[1, 23, 456, 7890, 12345];
- let mut ra: IsaacRng = SeedableRng::from_seed(seed);
- let mut rb: IsaacRng = SeedableRng::from_seed(seed);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_32_reseed() {
- let s = ::test::rng().gen_iter::<u32>().take(256).collect::<Vec<u32>>();
- let mut r: IsaacRng = SeedableRng::from_seed(&s[..]);
- let string1: String = r.gen_ascii_chars().take(100).collect();
-
- r.reseed(&s[..]);
-
- let string2: String = r.gen_ascii_chars().take(100).collect();
- assert_eq!(string1, string2);
- }
-
- #[test]
- fn test_rng_32_true_values() {
- let seed: &[_] = &[1, 23, 456, 7890, 12345];
- let mut ra: IsaacRng = SeedableRng::from_seed(seed);
- // Regression test that isaac is actually using the above vector
- let v = (0..10).map(|_| ra.next_u32()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(2558573138, 873787463, 263499565, 2103644246, 3595684709,
- 4203127393, 264982119, 2765226902, 2737944514, 3900253796));
-
- let seed: &[_] = &[12345, 67890, 54321, 9876];
- let mut rb: IsaacRng = SeedableRng::from_seed(seed);
- // skip forward to the 10000th number
- for _ in 0..10000 { rb.next_u32(); }
-
- let v = (0..10).map(|_| rb.next_u32()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(3676831399, 3183332890, 2834741178, 3854698763, 2717568474,
- 1576568959, 3507990155, 179069555, 141456972, 2478885421));
- }
-}
diff --git a/rand/src/prng/isaac64.rs b/rand/src/prng/isaac64.rs
deleted file mode 100644
index b98e3fe..0000000
--- a/rand/src/prng/isaac64.rs
+++ /dev/null
@@ -1,340 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The ISAAC-64 random number generator.
-
-use core::slice;
-use core::iter::repeat;
-use core::num::Wrapping as w;
-use core::fmt;
-
-use {Rng, SeedableRng, Rand};
-
-#[allow(bad_style)]
-type w64 = w<u64>;
-
-const RAND_SIZE_64_LEN: usize = 8;
-const RAND_SIZE_64: usize = 1 << RAND_SIZE_64_LEN;
-
-/// A random number generator that uses ISAAC-64[1], the 64-bit
-/// variant of the ISAAC algorithm.
-///
-/// The ISAAC algorithm is generally accepted as suitable for
-/// cryptographic purposes, but this implementation has not be
-/// verified as such. Prefer a generator like `OsRng` that defers to
-/// the operating system for cases that need high security.
-///
-/// [1]: Bob Jenkins, [*ISAAC: A fast cryptographic random number
-/// generator*](http://www.burtleburtle.net/bob/rand/isaacafa.html)
-#[derive(Copy)]
-pub struct Isaac64Rng {
- cnt: usize,
- rsl: [w64; RAND_SIZE_64],
- mem: [w64; RAND_SIZE_64],
- a: w64,
- b: w64,
- c: w64,
-}
-
-static EMPTY_64: Isaac64Rng = Isaac64Rng {
- cnt: 0,
- rsl: [w(0); RAND_SIZE_64],
- mem: [w(0); RAND_SIZE_64],
- a: w(0), b: w(0), c: w(0),
-};
-
-impl Isaac64Rng {
- /// Create a 64-bit ISAAC random number generator using the
- /// default fixed seed.
- pub fn new_unseeded() -> Isaac64Rng {
- let mut rng = EMPTY_64;
- rng.init(false);
- rng
- }
-
- /// Initialises `self`. If `use_rsl` is true, then use the current value
- /// of `rsl` as a seed, otherwise construct one algorithmically (not
- /// randomly).
- fn init(&mut self, use_rsl: bool) {
- macro_rules! init {
- ($var:ident) => (
- let mut $var = w(0x9e3779b97f4a7c13);
- )
- }
- init!(a); init!(b); init!(c); init!(d);
- init!(e); init!(f); init!(g); init!(h);
-
- macro_rules! mix {
- () => {{
- a=a-e; f=f^(h>>9); h=h+a;
- b=b-f; g=g^(a<<9); a=a+b;
- c=c-g; h=h^(b>>23); b=b+c;
- d=d-h; a=a^(c<<15); c=c+d;
- e=e-a; b=b^(d>>14); d=d+e;
- f=f-b; c=c^(e<<20); e=e+f;
- g=g-c; d=d^(f>>17); f=f+g;
- h=h-d; e=e^(g<<14); g=g+h;
- }}
- }
-
- for _ in 0..4 {
- mix!();
- }
-
- if use_rsl {
- macro_rules! memloop {
- ($arr:expr) => {{
- for i in (0..RAND_SIZE_64 / 8).map(|i| i * 8) {
- a=a+$arr[i ]; b=b+$arr[i+1];
- c=c+$arr[i+2]; d=d+$arr[i+3];
- e=e+$arr[i+4]; f=f+$arr[i+5];
- g=g+$arr[i+6]; h=h+$arr[i+7];
- mix!();
- self.mem[i ]=a; self.mem[i+1]=b;
- self.mem[i+2]=c; self.mem[i+3]=d;
- self.mem[i+4]=e; self.mem[i+5]=f;
- self.mem[i+6]=g; self.mem[i+7]=h;
- }
- }}
- }
-
- memloop!(self.rsl);
- memloop!(self.mem);
- } else {
- for i in (0..RAND_SIZE_64 / 8).map(|i| i * 8) {
- mix!();
- self.mem[i ]=a; self.mem[i+1]=b;
- self.mem[i+2]=c; self.mem[i+3]=d;
- self.mem[i+4]=e; self.mem[i+5]=f;
- self.mem[i+6]=g; self.mem[i+7]=h;
- }
- }
-
- self.isaac64();
- }
-
- /// Refills the output buffer (`self.rsl`)
- fn isaac64(&mut self) {
- self.c = self.c + w(1);
- // abbreviations
- let mut a = self.a;
- let mut b = self.b + self.c;
- const MIDPOINT: usize = RAND_SIZE_64 / 2;
- const MP_VEC: [(usize, usize); 2] = [(0,MIDPOINT), (MIDPOINT, 0)];
- macro_rules! ind {
- ($x:expr) => {
- *self.mem.get_unchecked((($x >> 3usize).0 as usize) & (RAND_SIZE_64 - 1))
- }
- }
-
- for &(mr_offset, m2_offset) in MP_VEC.iter() {
- for base in (0..MIDPOINT / 4).map(|i| i * 4) {
-
- macro_rules! rngstepp {
- ($j:expr, $shift:expr) => {{
- let base = base + $j;
- let mix = a ^ (a << $shift);
- let mix = if $j == 0 {!mix} else {mix};
-
- unsafe {
- let x = *self.mem.get_unchecked(base + mr_offset);
- a = mix + *self.mem.get_unchecked(base + m2_offset);
- let y = ind!(x) + a + b;
- *self.mem.get_unchecked_mut(base + mr_offset) = y;
-
- b = ind!(y >> RAND_SIZE_64_LEN) + x;
- *self.rsl.get_unchecked_mut(base + mr_offset) = b;
- }
- }}
- }
-
- macro_rules! rngstepn {
- ($j:expr, $shift:expr) => {{
- let base = base + $j;
- let mix = a ^ (a >> $shift);
- let mix = if $j == 0 {!mix} else {mix};
-
- unsafe {
- let x = *self.mem.get_unchecked(base + mr_offset);
- a = mix + *self.mem.get_unchecked(base + m2_offset);
- let y = ind!(x) + a + b;
- *self.mem.get_unchecked_mut(base + mr_offset) = y;
-
- b = ind!(y >> RAND_SIZE_64_LEN) + x;
- *self.rsl.get_unchecked_mut(base + mr_offset) = b;
- }
- }}
- }
-
- rngstepp!(0, 21);
- rngstepn!(1, 5);
- rngstepp!(2, 12);
- rngstepn!(3, 33);
- }
- }
-
- self.a = a;
- self.b = b;
- self.cnt = RAND_SIZE_64;
- }
-}
-
-// Cannot be derived because [u32; 256] does not implement Clone
-impl Clone for Isaac64Rng {
- fn clone(&self) -> Isaac64Rng {
- *self
- }
-}
-
-impl Rng for Isaac64Rng {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- self.next_u64() as u32
- }
-
- #[inline]
- fn next_u64(&mut self) -> u64 {
- if self.cnt == 0 {
- // make some more numbers
- self.isaac64();
- }
- self.cnt -= 1;
-
- // See corresponding location in IsaacRng.next_u32 for
- // explanation.
- debug_assert!(self.cnt < RAND_SIZE_64);
- self.rsl[(self.cnt % RAND_SIZE_64) as usize].0
- }
-}
-
-impl<'a> SeedableRng<&'a [u64]> for Isaac64Rng {
- fn reseed(&mut self, seed: &'a [u64]) {
- // make the seed into [seed[0], seed[1], ..., seed[seed.len()
- // - 1], 0, 0, ...], to fill rng.rsl.
- let seed_iter = seed.iter().map(|&x| x).chain(repeat(0u64));
-
- for (rsl_elem, seed_elem) in self.rsl.iter_mut().zip(seed_iter) {
- *rsl_elem = w(seed_elem);
- }
- self.cnt = 0;
- self.a = w(0);
- self.b = w(0);
- self.c = w(0);
-
- self.init(true);
- }
-
- /// Create an ISAAC random number generator with a seed. This can
- /// be any length, although the maximum number of elements used is
- /// 256 and any more will be silently ignored. A generator
- /// constructed with a given seed will generate the same sequence
- /// of values as all other generators constructed with that seed.
- fn from_seed(seed: &'a [u64]) -> Isaac64Rng {
- let mut rng = EMPTY_64;
- rng.reseed(seed);
- rng
- }
-}
-
-impl Rand for Isaac64Rng {
- fn rand<R: Rng>(other: &mut R) -> Isaac64Rng {
- let mut ret = EMPTY_64;
- unsafe {
- let ptr = ret.rsl.as_mut_ptr() as *mut u8;
-
- let slice = slice::from_raw_parts_mut(ptr, RAND_SIZE_64 * 8);
- other.fill_bytes(slice);
- }
- ret.cnt = 0;
- ret.a = w(0);
- ret.b = w(0);
- ret.c = w(0);
-
- ret.init(true);
- return ret;
- }
-}
-
-impl fmt::Debug for Isaac64Rng {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "Isaac64Rng {{}}")
- }
-}
-
-#[cfg(test)]
-mod test {
- use {Rng, SeedableRng};
- use super::Isaac64Rng;
-
- #[test]
- fn test_rng_64_rand_seeded() {
- let s = ::test::rng().gen_iter::<u64>().take(256).collect::<Vec<u64>>();
- let mut ra: Isaac64Rng = SeedableRng::from_seed(&s[..]);
- let mut rb: Isaac64Rng = SeedableRng::from_seed(&s[..]);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_64_seeded() {
- let seed: &[_] = &[1, 23, 456, 7890, 12345];
- let mut ra: Isaac64Rng = SeedableRng::from_seed(seed);
- let mut rb: Isaac64Rng = SeedableRng::from_seed(seed);
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_64_reseed() {
- let s = ::test::rng().gen_iter::<u64>().take(256).collect::<Vec<u64>>();
- let mut r: Isaac64Rng = SeedableRng::from_seed(&s[..]);
- let string1: String = r.gen_ascii_chars().take(100).collect();
-
- r.reseed(&s[..]);
-
- let string2: String = r.gen_ascii_chars().take(100).collect();
- assert_eq!(string1, string2);
- }
-
- #[test]
- fn test_rng_64_true_values() {
- let seed: &[_] = &[1, 23, 456, 7890, 12345];
- let mut ra: Isaac64Rng = SeedableRng::from_seed(seed);
- // Regression test that isaac is actually using the above vector
- let v = (0..10).map(|_| ra.next_u64()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(547121783600835980, 14377643087320773276, 17351601304698403469,
- 1238879483818134882, 11952566807690396487, 13970131091560099343,
- 4469761996653280935, 15552757044682284409, 6860251611068737823,
- 13722198873481261842));
-
- let seed: &[_] = &[12345, 67890, 54321, 9876];
- let mut rb: Isaac64Rng = SeedableRng::from_seed(seed);
- // skip forward to the 10000th number
- for _ in 0..10000 { rb.next_u64(); }
-
- let v = (0..10).map(|_| rb.next_u64()).collect::<Vec<_>>();
- assert_eq!(v,
- vec!(18143823860592706164, 8491801882678285927, 2699425367717515619,
- 17196852593171130876, 2606123525235546165, 15790932315217671084,
- 596345674630742204, 9947027391921273664, 11788097613744130851,
- 10391409374914919106));
- }
-
- #[test]
- fn test_rng_clone() {
- let seed: &[_] = &[1, 23, 456, 7890, 12345];
- let mut rng: Isaac64Rng = SeedableRng::from_seed(seed);
- let mut clone = rng.clone();
- for _ in 0..16 {
- assert_eq!(rng.next_u64(), clone.next_u64());
- }
- }
-}
diff --git a/rand/src/prng/mod.rs b/rand/src/prng/mod.rs
index ed3e018..3c0d27b 100644
--- a/rand/src/prng/mod.rs
+++ b/rand/src/prng/mod.rs
@@ -1,51 +1,37 @@
-// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
+// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
-//! Pseudo random number generators are algorithms to produce *apparently
-//! random* numbers deterministically, and usually fairly quickly.
+//! Pseudo-random number generators.
+//!
+//! This module is deprecated:
//!
-//! So long as the algorithm is computationally secure, is initialised with
-//! sufficient entropy (i.e. unknown by an attacker), and its internal state is
-//! also protected (unknown to an attacker), the output will also be
-//! *computationally secure*. Computationally Secure Pseudo Random Number
-//! Generators (CSPRNGs) are thus suitable sources of random numbers for
-//! cryptography. There are a couple of gotchas here, however. First, the seed
-//! used for initialisation must be unknown. Usually this should be provided by
-//! the operating system and should usually be secure, however this may not
-//! always be the case (especially soon after startup). Second, user-space
-//! memory may be vulnerable, for example when written to swap space, and after
-//! forking a child process should reinitialise any user-space PRNGs. For this
-//! reason it may be preferable to source random numbers directly from the OS
-//! for cryptographic applications.
-//!
-//! PRNGs are also widely used for non-cryptographic uses: randomised
-//! algorithms, simulations, games. In these applications it is usually not
-//! important for numbers to be cryptographically *unguessable*, but even
-//! distribution and independence from other samples (from the point of view
-//! of someone unaware of the algorithm used, at least) may still be important.
-//! Good PRNGs should satisfy these properties, but do not take them for
-//! granted; Wikipedia's article on
-//! [Pseudorandom number generators](https://en.wikipedia.org/wiki/Pseudorandom_number_generator)
-//! provides some background on this topic.
-//!
-//! Care should be taken when seeding (initialising) PRNGs. Some PRNGs have
-//! short periods for some seeds. If one PRNG is seeded from another using the
-//! same algorithm, it is possible that both will yield the same sequence of
-//! values (with some lag).
-
-mod chacha;
-mod isaac;
-mod isaac64;
-mod xorshift;
+//! - documentation has moved to
+//! [The Book](https://rust-random.github.io/book/guide-rngs.html),
+//! - PRNGs have moved to other `rand_*` crates.
-pub use self::chacha::ChaChaRng;
-pub use self::isaac::IsaacRng;
-pub use self::isaac64::Isaac64Rng;
-pub use self::xorshift::XorShiftRng;
+// Deprecations (to be removed in 0.7)
+#[doc(hidden)] #[allow(deprecated)]
+pub use deprecated::XorShiftRng;
+#[doc(hidden)] pub mod isaac {
+ // Note: we miss `IsaacCore` here but probably unimportant.
+ #[allow(deprecated)] pub use deprecated::IsaacRng;
+}
+#[doc(hidden)] pub mod isaac64 {
+ #[allow(deprecated)] pub use deprecated::Isaac64Rng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::{IsaacRng, Isaac64Rng};
+#[doc(hidden)] pub mod chacha {
+ // Note: we miss `ChaChaCore` here but probably unimportant.
+ #[allow(deprecated)] pub use deprecated::ChaChaRng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::ChaChaRng;
+#[doc(hidden)] pub mod hc128 {
+ // Note: we miss `Hc128Core` here but probably unimportant.
+ #[allow(deprecated)] pub use deprecated::Hc128Rng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::Hc128Rng;
diff --git a/rand/src/prng/xorshift.rs b/rand/src/prng/xorshift.rs
deleted file mode 100644
index dd367e9..0000000
--- a/rand/src/prng/xorshift.rs
+++ /dev/null
@@ -1,101 +0,0 @@
-// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! Xorshift generators
-
-use core::num::Wrapping as w;
-use {Rng, SeedableRng, Rand};
-
-/// An Xorshift[1] random number
-/// generator.
-///
-/// The Xorshift algorithm is not suitable for cryptographic purposes
-/// but is very fast. If you do not know for sure that it fits your
-/// requirements, use a more secure one such as `IsaacRng` or `OsRng`.
-///
-/// [1]: Marsaglia, George (July 2003). ["Xorshift
-/// RNGs"](http://www.jstatsoft.org/v08/i14/paper). *Journal of
-/// Statistical Software*. Vol. 8 (Issue 14).
-#[allow(missing_copy_implementations)]
-#[derive(Clone, Debug)]
-pub struct XorShiftRng {
- x: w<u32>,
- y: w<u32>,
- z: w<u32>,
- w: w<u32>,
-}
-
-impl XorShiftRng {
- /// Creates a new XorShiftRng instance which is not seeded.
- ///
- /// The initial values of this RNG are constants, so all generators created
- /// by this function will yield the same stream of random numbers. It is
- /// highly recommended that this is created through `SeedableRng` instead of
- /// this function
- pub fn new_unseeded() -> XorShiftRng {
- XorShiftRng {
- x: w(0x193a6754),
- y: w(0xa8a7d469),
- z: w(0x97830e05),
- w: w(0x113ba7bb),
- }
- }
-}
-
-impl Rng for XorShiftRng {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- let x = self.x;
- let t = x ^ (x << 11);
- self.x = self.y;
- self.y = self.z;
- self.z = self.w;
- let w_ = self.w;
- self.w = w_ ^ (w_ >> 19) ^ (t ^ (t >> 8));
- self.w.0
- }
-}
-
-impl SeedableRng<[u32; 4]> for XorShiftRng {
- /// Reseed an XorShiftRng. This will panic if `seed` is entirely 0.
- fn reseed(&mut self, seed: [u32; 4]) {
- assert!(!seed.iter().all(|&x| x == 0),
- "XorShiftRng.reseed called with an all zero seed.");
-
- self.x = w(seed[0]);
- self.y = w(seed[1]);
- self.z = w(seed[2]);
- self.w = w(seed[3]);
- }
-
- /// Create a new XorShiftRng. This will panic if `seed` is entirely 0.
- fn from_seed(seed: [u32; 4]) -> XorShiftRng {
- assert!(!seed.iter().all(|&x| x == 0),
- "XorShiftRng::from_seed called with an all zero seed.");
-
- XorShiftRng {
- x: w(seed[0]),
- y: w(seed[1]),
- z: w(seed[2]),
- w: w(seed[3]),
- }
- }
-}
-
-impl Rand for XorShiftRng {
- fn rand<R: Rng>(rng: &mut R) -> XorShiftRng {
- let mut tuple: (u32, u32, u32, u32) = rng.gen();
- while tuple == (0, 0, 0, 0) {
- tuple = rng.gen();
- }
- let (x, y, z, w_) = tuple;
- XorShiftRng { x: w(x), y: w(y), z: w(z), w: w(w_) }
- }
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 20:38:46 +0000