33232a0343
* Sebastian's HQC merge request * Clean up changes to common infrastructure * Fix Bitmask macro It assumed that ``unsigned long`` was 64 bit * Remove maxlen from nistseedexpander It's a complicated thing to handle because the value is larger than size_t supports on 32-bit platforms * Initialize buffers to help linter * Add Nistseedexpander test * Resolve UB in gf2x.c Some of the shifts could be larger than WORD_SIZE_BITS, ie. larger than the width of uint64_t. This apparently on Intel gets interpreted as the shift mod 64, but on ARM something else happened. * Fix Windows complaints * rename log, exp which appear to be existing functions on MS * Solve endianness problems * remove all spaces before ';' * Fix duplicate consistency * Fix duplicate consistency * Fix complaints by MSVC about narrowing int * Add nistseedexpander.obj to COMMON_OBJECTS_NOPATH * astyle format util.[ch] * add util.h to makefile * Sort includes in util.h * Fix more Windows MSVC complaints Co-authored-by: Sebastian Verschoor <sebastian@zeroknowledge.me> Co-authored-by: Thom Wiggers <thom@thomwiggers.nl>
79 rivejä
1.8 KiB
C
79 rivejä
1.8 KiB
C
/**
|
|
* WARNING
|
|
*
|
|
* This file generates a PREDICTABLE and NOT AT ALL RANDOM sequence of bytes.
|
|
*
|
|
* Its purpose is to support our testing suite and it MUST NOT be used in any
|
|
* scenario where you are expecting actual cryptography to happen.
|
|
*/
|
|
|
|
#include "randombytes.h"
|
|
#include <stdint.h>
|
|
|
|
static uint32_t seed[32] = { 3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3,
|
|
2, 3, 8, 4, 6, 2, 6, 4, 3, 3, 8, 3, 2, 7, 9, 5
|
|
};
|
|
static uint32_t in[12];
|
|
static uint32_t out[8];
|
|
static int32_t outleft = 0;
|
|
|
|
#define ROTATE(x, b) (((x) << (b)) | ((x) >> (32 - (b))))
|
|
#define MUSH(i, b) x = t[i] += (((x ^ seed[i]) + sum) ^ ROTATE(x, b));
|
|
|
|
static void surf(void) {
|
|
uint32_t t[12];
|
|
uint32_t x;
|
|
uint32_t sum = 0;
|
|
int32_t r;
|
|
int32_t i;
|
|
int32_t loop;
|
|
|
|
for (i = 0; i < 12; ++i) {
|
|
t[i] = in[i] ^ seed[12 + i];
|
|
}
|
|
for (i = 0; i < 8; ++i) {
|
|
out[i] = seed[24 + i];
|
|
}
|
|
x = t[11];
|
|
for (loop = 0; loop < 2; ++loop) {
|
|
for (r = 0; r < 16; ++r) {
|
|
sum += 0x9e3779b9;
|
|
MUSH(0, 5)
|
|
MUSH(1, 7)
|
|
MUSH(2, 9)
|
|
MUSH(3, 13)
|
|
MUSH(4, 5)
|
|
MUSH(5, 7)
|
|
MUSH(6, 9)
|
|
MUSH(7, 13)
|
|
MUSH(8, 5)
|
|
MUSH(9, 7)
|
|
MUSH(10, 9)
|
|
MUSH(11, 13)
|
|
}
|
|
for (i = 0; i < 8; ++i) {
|
|
out[i] ^= t[i + 4];
|
|
}
|
|
}
|
|
}
|
|
|
|
int randombytes(uint8_t *buf, size_t n) {
|
|
while (n > 0) {
|
|
if (!outleft) {
|
|
if (!++in[0]) {
|
|
if (!++in[1]) {
|
|
if (!++in[2]) {
|
|
++in[3];
|
|
}
|
|
}
|
|
}
|
|
surf();
|
|
outleft = 8;
|
|
}
|
|
*buf = (uint8_t) out[--outleft];
|
|
++buf;
|
|
--n;
|
|
}
|
|
return 0;
|
|
}
|