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New implementation of Curve25519 (using multiplications of words of 15 bits or so, should be much faster on Cortex M0).

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This commit is contained in:
Thomas Pornin 2017-01-15 16:49:58 +01:00
parent 2f9c953af4
commit 693d2a0085
6 changed files with 1574 additions and 7 deletions
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49
test/test_crypto.c
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@ -4935,13 +4935,13 @@ const struct {
static void
test_EC_c25519(const char *name, const br_ec_impl *iec)
{
unsigned char bu[32], bk[32], br[32];
size_t v;
int i;
printf("Test %s: ", name);
fflush(stdout);
for (v = 0; C25519_KAT[v].scalar; v ++) {
unsigned char bu[32], bk[32], br[32];
hextobin(bk, C25519_KAT[v].scalar);
hextobin(bu, C25519_KAT[v].u_in);
hextobin(br, C25519_KAT[v].u_out);
@ -4956,6 +4956,44 @@ test_EC_c25519(const char *name, const br_ec_impl *iec)
printf(".");
fflush(stdout);
}
printf(" ");
fflush(stdout);
memset(bu, 0, sizeof bu);
bu[0] = 0x09;
memcpy(bk, bu, sizeof bu);
for (i = 1; i <= 1000; i ++) {
if (!iec->mul(bu, sizeof bu, bk, sizeof bk, BR_EC_curve25519)) {
fprintf(stderr, "Curve25519 multiplication failed"
" (iter=%d)\n", i);
exit(EXIT_FAILURE);
}
for (v = 0; v < sizeof bu; v ++) {
unsigned t;
t = bu[v];
bu[v] = bk[v];
bk[v] = t;
}
if (i == 1 || i == 1000) {
const char *sref;
sref = (i == 1)
? "422C8E7A6227D7BCA1350B3E2BB7279F7897B87BB6854B783C60E80311AE3079"
: "684CF59BA83309552800EF566F2F4D3C1C3887C49360E3875F2EB94D99532C51";
hextobin(br, sref);
if (memcmp(bk, br, sizeof bk) != 0) {
fprintf(stderr,
"Curve25519 failed KAT (iter=%d)\n", i);
exit(EXIT_FAILURE);
}
}
if (i % 100 == 0) {
printf(".");
fflush(stdout);
}
}
printf(" done.\n");
fflush(stdout);
}
@ -4966,6 +5004,12 @@ test_EC_c25519_i15(void)
test_EC_c25519("EC_c25519_i15", &br_ec_c25519_i15);
}
static void
test_EC_c25519_m15(void)
{
test_EC_c25519("EC_c25519_m15", &br_ec_c25519_m15);
}
static const unsigned char EC_P256_PUB_POINT[] = {
0x04, 0x60, 0xFE, 0xD4, 0xBA, 0x25, 0x5A, 0x9D,
0x31, 0xC9, 0x61, 0xEB, 0x74, 0xC6, 0x35, 0x6D,
@ -5513,6 +5557,7 @@ static const struct {
STU(EC_p256_m15),
/* STU(EC_prime_i32), */
STU(EC_c25519_i15),
STU(EC_c25519_m15),
STU(ECDSA_i15),
STU(ECDSA_i31),
{ 0, 0 }