mirror of
https://github.com/aljazceru/turso.git
synced 2025-12-26 12:34:22 +01:00
1aad1b224a
Depends on #3584 to use the most up-to-date implementation of `ThreadRng` - Add `fill_bytes` method to `IO` - use `thread_rng` instead of `getrandom`, as `getrandom` is much slower and `thread_rng` offers enough security - modify `exec_randomblob`, `exec_random` and random_rowid generation to use methods from IO for determinism - modified simulator IO to implement `fill_bytes` This the PRNG for sqlite if someone is curious. It is similar to `thread_rng`: ```c /* Initialize the state of the random number generator once, ** the first time this routine is called. */ if( wsdPrng.s[0]==0 ){ sqlite3_vfs *pVfs = sqlite3_vfs_find(0); static const u32 chacha20_init[] = { 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 }; memcpy(&wsdPrng.s[0], chacha20_init, 16); if( NEVER(pVfs==0) ){ memset(&wsdPrng.s[4], 0, 44); }else{ sqlite3OsRandomness(pVfs, 44, (char*)&wsdPrng.s[4]); } wsdPrng.s[15] = wsdPrng.s[12]; wsdPrng.s[12] = 0; wsdPrng.n = 0; } assert( N>0 ); while( 1 /* exit by break */ ){ if( N<=wsdPrng.n ){ memcpy(zBuf, &wsdPrng.out[wsdPrng.n-N], N); wsdPrng.n -= N; break; } if( wsdPrng.n>0 ){ memcpy(zBuf, wsdPrng.out, wsdPrng.n); N -= wsdPrng.n; zBuf += wsdPrng.n; } wsdPrng.s[12]++; chacha_block((u32*)wsdPrng.out, wsdPrng.s); wsdPrng.n = 64; } sqlite3_mutex_leave(mutex); ``` Reviewed-by: Pere Diaz Bou <pere-altea@homail.com> Closes #3799