ref: 1583a55d91725ddf4166b0c0fe7623a88a5f9cd3
dir: /libmp/mprand.c/
#include "os.h" #include <mp.h> #include "dat.h" mpint* mprand(int bits, void (*gen)(uchar*, int), mpint *b) { mpdigit mask; if(b == nil){ b = mpnew(bits); setmalloctag(b, getcallerpc(&bits)); }else mpbits(b, bits); b->sign = 1; b->top = DIGITS(bits); (*gen)((uchar*)b->p, b->top*Dbytes); mask = ((mpdigit)1 << (bits%Dbits))-1; if(mask != 0) b->p[b->top-1] &= mask; return mpnorm(b); }