README.md

PRNG

Collection of pseudorandom number generators. And including the uniform integer distribution.

List of PRNG's

32 bits:

• xorshift32
• xorshift128
• xorwow
• xoroshiro64(*/**)
• xoshiro128(+/++/**)
• mt19937
• pcg32
• lfsr32
• splitmix32

64 bits:

• xorshift64[*]
• xorshift[r]128+
• xoshiro256(+/++/**)
• xoshiro512(+/++/**)
• xoroshiro128(+/++/**)
• xoroshiro1024(++/*/**)
• mt19937-64
• pcg64
• lfsr64
• lfsr128
• splitmix64

All generators output number in range $[0; 2^w)$, where $w$ is output bit width.

Seed sequence

Taken from: pcg alternative of std::seed_seq

Structure prng_seedseq_t use for mixing start entropy and filling prng state at 'seed' values.

Simple exapmle

prng_seedseq_t sq;
// fill sequence outer entropy
prng_seedseq_init(&sq, (uint32_t[4]){time(0), clock(), 0, 0});
/* ... */
uint32_t state[4] = {0};
prng_seedseq_get_u32(&sq, state, 4); // set state at seeds

Xoshiro256** secret messages

Taken from: pcg blog about xoshiro256**

How get message:

1. Set state with magic values
2. Get from current state 256 bytes (32 x 64-bit integers)
3. Open this 256 bytes in hex reader
4. On address 0x80 start secret message

Magic states:

1. Author signature - { 0x01d353e5f3993bb0, 0x7b9c0df6cb193b20, 0xfdfcaa91110765b6, 0xd2db341f10bb232e }
2. "Please don't multiply by 57" - { 0x4685307f2e2c9b43, 0xa999f3abba9e66fe, 0xf74ff5fab0e603da, 0x6dc878990b1ea4db }