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#if defined(_WIN32)
#include <windows.h>
#include <wincrypt.h>
typedef unsigned int uint32_t;
typedef unsigned __int64 uint64_t;
#else
#include <stdint.h>
#endif
#include <string.h>
#include <stdio.h>
#include "ed25519-donna.h"
#include "curve25519-ref10.h"
static void
print_diff(const char *desc, const unsigned char *a, const unsigned char *b, size_t len) {
size_t p = 0;
unsigned char diff;
printf("%s diff:\n", desc);
while (len--) {
diff = *a++ ^ *b++;
if (!diff)
printf("____,");
else
printf("0x%02x,", diff);
if ((++p & 15) == 0)
printf("\n");
}
printf("\n\n");
}
static void
print_bytes(const char *desc, const unsigned char *bytes, size_t len) {
size_t p = 0;
printf("%s:\n", desc);
while (len--) {
printf("0x%02x,", *bytes++);
if ((++p & 15) == 0)
printf("\n");
}
printf("\n\n");
}
/* chacha20/12 prng */
void
prng(unsigned char *out, size_t bytes) {
static uint32_t state[16];
static int init = 0;
uint32_t x[16], t;
size_t i;
if (!init) {
#if defined(_WIN32)
HCRYPTPROV csp;
if (!CryptAcquireContext(&csp, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
printf("CryptAcquireContext failed\n");
exit(1);
}
if (!CryptGenRandom(csp, (DWORD)sizeof(state), (BYTE*)state)) {
printf("CryptGenRandom failed\n");
exit(1);
}
CryptReleaseContext(csp, 0);
#else
FILE *f = NULL;
f = fopen("/dev/urandom", "rb");
if (!f) {
printf("failed to open /dev/urandom\n");
exit(1);
}
if (fread(state, sizeof(state), 1, f) != 1) {
printf("read error on /dev/urandom\n");
exit(1);
}
#endif
init = 1;
}
while (bytes) {
for (i = 0; i < 16; i++) x[i] = state[i];
#define rotl32(x,k) ((x << k) | (x >> (32 - k)))
#define quarter(a,b,c,d) \
x[a] += x[b]; t = x[d]^x[a]; x[d] = rotl32(t,16); \
x[c] += x[d]; t = x[b]^x[c]; x[b] = rotl32(t,12); \
x[a] += x[b]; t = x[d]^x[a]; x[d] = rotl32(t, 8); \
x[c] += x[d]; t = x[b]^x[c]; x[b] = rotl32(t, 7);
for (i = 0; i < 12; i += 2) {
quarter( 0, 4, 8,12)
quarter( 1, 5, 9,13)
quarter( 2, 6,10,14)
quarter( 3, 7,11,15)
quarter( 0, 5,10,15)
quarter( 1, 6,11,12)
quarter( 2, 7, 8,13)
quarter( 3, 4, 9,14)
};
if (bytes <= 64) {
memcpy(out, x, bytes);
bytes = 0;
} else {
memcpy(out, x, 64);
bytes -= 64;
out += 64;
}
/* don't need a nonce, so last 4 words are the counter. 2^136 bytes can be generated */
if (!++state[12]) if (!++state[13]) if (!++state[14]) ++state[15];
}
}
int main() {
const size_t skmax = 1024;
static unsigned char sk[1024][32];
unsigned char pk[3][32];
unsigned char *skp;
size_t ski, pki, i;
uint64_t ctr;
printf("fuzzing: ");
printf(" ref10");
printf(" curved25519");
#if defined(ED25519_SSE2)
printf(" curved25519-sse2");
#endif
printf("\n\n");
for (ctr = 0, ski = skmax;;ctr++) {
if (ski == skmax) {
prng((unsigned char *)sk, sizeof(sk));
ski = 0;
}
skp = sk[ski++];
pki = 0;
crypto_scalarmult_base_ref10(pk[pki++], skp);
curved25519_scalarmult_basepoint(pk[pki++], skp);
#if defined(ED25519_SSE2)
curved25519_scalarmult_basepoint_sse2(pk[pki++], skp);
#endif
for (i = 1; i < pki; i++) {
if (memcmp(pk[0], pk[i], 32) != 0) {
printf("\n\n");
print_bytes("sk", skp, 32);
print_bytes("ref10", pk[0], 32);
print_diff("curved25519", pk[0], pk[1], 32);
#if defined(ED25519_SSE2)
print_diff("curved25519-sse2", pk[0], pk[2], 32);
#endif
exit(1);
}
}
if (ctr && (ctr % 0x1000 == 0)) {
printf(".");
if ((ctr % 0x20000) == 0) {
printf(" [");
for (i = 0; i < 8; i++)
printf("%02x", (unsigned char)(ctr >> ((7 - i) * 8)));
printf("]\n");
}
}
}
}
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