hardened_malloc/random.h

#ifndef RANDOM_H
#define RANDOM_H

#include "chacha.h"
#include "util.h"

#define RANDOM_CACHE_SIZE 256ULL
#define RANDOM_RESEED_SIZE 256ULL * 1024

struct random_state {
    size_t index;
    size_t reseed;
    chacha_ctx ctx;
    u8 cache[RANDOM_CACHE_SIZE];
};

void random_state_init(struct random_state *state);
u16 get_random_u16(struct random_state *state);
u16 get_random_u16_uniform(struct random_state *state, u16 bound);
u64 get_random_u64(struct random_state *state);
u64 get_random_u64_uniform(struct random_state *state, u64 bound);

#endif
initial commit 2018-08-22 00:53:22 +05:30			`#ifndef RANDOM_H`
			`#define RANDOM_H`

use ChaCha8-based CSPRNG 2018-08-26 08:30:00 +05:30			`#include "chacha.h"`
use a consistent style for fixed-size int types The stdint.h types don't cover 128-bit integers and the underscore makes them ill suited to usage in function suffixes. Instead, use the common naming style in the Linux kernel and elsewhere including the ChaCha8 implementation included here. 2018-10-04 23:55:16 +05:30			`#include "util.h"`
use ChaCha8-based CSPRNG 2018-08-26 08:30:00 +05:30
			`#define RANDOM_CACHE_SIZE 256ULL`
			`#define RANDOM_RESEED_SIZE 256ULL * 1024`
implement a cache for the CSPRNG 2018-08-24 02:00:44 +05:30
initial commit 2018-08-22 00:53:22 +05:30			`struct random_state {`
implement a cache for the CSPRNG 2018-08-24 02:00:44 +05:30			`size_t index;`
use ChaCha8-based CSPRNG 2018-08-26 08:30:00 +05:30			`size_t reseed;`
			`chacha_ctx ctx;`
use a consistent style for fixed-size int types The stdint.h types don't cover 128-bit integers and the underscore makes them ill suited to usage in function suffixes. Instead, use the common naming style in the Linux kernel and elsewhere including the ChaCha8 implementation included here. 2018-10-04 23:55:16 +05:30			`u8 cache[RANDOM_CACHE_SIZE];`
initial commit 2018-08-22 00:53:22 +05:30			`};`

			`void random_state_init(struct random_state *state);`
use a consistent style for fixed-size int types The stdint.h types don't cover 128-bit integers and the underscore makes them ill suited to usage in function suffixes. Instead, use the common naming style in the Linux kernel and elsewhere including the ChaCha8 implementation included here. 2018-10-04 23:55:16 +05:30			`u16 get_random_u16(struct random_state *state);`
			`u16 get_random_u16_uniform(struct random_state *state, u16 bound);`
			`u64 get_random_u64(struct random_state *state);`
			`u64 get_random_u64_uniform(struct random_state *state, u64 bound);`
initial commit 2018-08-22 00:53:22 +05:30
			`#endif`