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// Basic fuzz test for depcapsulate operation,
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
extern "C" {
#include "crypto_api.h"
#include "hash.c"
#undef randombytes
#define USE_SNTRUP761X25519 1
#ifdef SNTRUP761_NO_ASM
# undef __GNUC__
#endif
void randombytes(unsigned char *ptr, size_t l);
volatile crypto_int16 crypto_int16_optblocker = 0;
volatile crypto_int32 crypto_int32_optblocker = 0;
volatile crypto_int64 crypto_int64_optblocker = 0;
#include "sntrup761.c"
static int real_random;
void
randombytes(unsigned char *ptr, size_t l)
{
if (real_random)
arc4random_buf(ptr, l);
else
memset(ptr, 0, l);
}
void privkeys(unsigned char *zero_sk, unsigned char *rnd_sk)
{
unsigned char pk[crypto_kem_sntrup761_PUBLICKEYBYTES];
real_random = 0;
if (crypto_kem_sntrup761_keypair(pk, zero_sk) != 0)
errx(1, "crypto_kem_sntrup761_keypair failed");
real_random = 1;
if (crypto_kem_sntrup761_keypair(pk, rnd_sk) != 0)
errx(1, "crypto_kem_sntrup761_keypair failed");
}
int LLVMFuzzerTestOneInput(const uint8_t* input, size_t len)
{
static bool once;
unsigned char zero_sk[crypto_kem_sntrup761_SECRETKEYBYTES];
unsigned char rnd_sk[crypto_kem_sntrup761_SECRETKEYBYTES];
unsigned char ciphertext[crypto_kem_sntrup761_CIPHERTEXTBYTES];
unsigned char secret[crypto_kem_sntrup761_BYTES];
if (!once) {
privkeys(zero_sk, rnd_sk);
once = true;
}
memset(&ciphertext, 0, sizeof(ciphertext));
if (len > sizeof(ciphertext)) {
len = sizeof(ciphertext);
}
memcpy(ciphertext, input, len);
(void)crypto_kem_sntrup761_dec(secret, ciphertext, zero_sk);
(void)crypto_kem_sntrup761_dec(secret, ciphertext, rnd_sk);
return 0;
}
} // extern
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