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Extend badrand with badrand_buf

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Imbus 2025-10-01 02:41:09 +02:00
parent 6c3d50b6a5
commit 0dbb13fea0
2 changed files with 23 additions and 1 deletions
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19
kern/libkern/badrand.c
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@ -1,5 +1,6 @@
#include "badrand.h" #include "badrand.h"
#include <stdint.h> #include <stdint.h>
#include <string.h>
#define PRAND_BUILD_SEED \ #define PRAND_BUILD_SEED \
((uint64_t)(__TIME__[0]) * (uint64_t)(__TIME__[1]) * (uint64_t)(__TIME__[3]) * (uint64_t)(__TIME__[4]) * \ ((uint64_t)(__TIME__[0]) * (uint64_t)(__TIME__[1]) * (uint64_t)(__TIME__[3]) * (uint64_t)(__TIME__[4]) * \
@ -24,7 +25,23 @@ uint64_t badrand_range(uint64_t min, uint64_t max) {
return min + (x % range); return min + (x % range);
} }
void sbadprand(uint64_t s) { void badrand_buf(char *buf, size_t len) {
unsigned char *p = (unsigned char *)buf;
while (len >= 8) {
uint64_t r = badrand();
memcpy(p, &r, 8);
p += 8;
len -= 8;
}
if (len > 0) {
uint64_t r = badrand();
memcpy(p, &r, len);
}
}
void sbadrand(uint64_t s) {
if (s) { if (s) {
seed ^= (s * 0x9e3779b97f4a7c15ULL) + (seed << 6) + (seed >> 2); seed ^= (s * 0x9e3779b97f4a7c15ULL) + (seed << 6) + (seed >> 2);
} else { } else {

5
kern/libkern/badrand.h
View file

@ -40,4 +40,9 @@ uint64_t badrand();
*/ */
uint64_t badrand_range(uint64_t min, uint64_t max); uint64_t badrand_range(uint64_t min, uint64_t max);
/**
* @brief Fills buffer with random data
*/
void badrand_buf(char *buf, size_t len);
#endif // BADRAND_H #endif // BADRAND_H