pairing_t *
pairing_init_generate()
{
unsigned char seed[32];
if (ed25519_create_seed(seed)) {
return NULL;
}
return pairing_init_seed(seed);
}
int
pairing_session_handshake(pairing_session_t *session, const unsigned char ecdh_key[32], const unsigned char ed_key[32])
{
unsigned char ecdh_priv[32];
assert(session);
if (session->status == STATUS_FINISHED) {
return -1;
}
if (ed25519_create_seed(ecdh_priv)) {
return -2;
}
memcpy(session->ecdh_theirs, ecdh_key, 32);
memcpy(session->ed_theirs, ed_key, 32);
curve25519_donna(session->ecdh_ours, ecdh_priv, kCurve25519BasePoint);
curve25519_donna(session->ecdh_secret, ecdh_priv, session->ecdh_theirs);
session->status = STATUS_HANDSHAKE;
return 0;
}
void c_crypto_ed25519::generate_key () {
ed25519_create_seed(seed);
ed25519_create_keypair(public_key, private_key, seed);
}
int main(int argc, char *argv[]) {
unsigned char public_key[32], private_key[64], seed[32], scalar[32];
unsigned char other_public_key[32], other_private_key[64];
unsigned char shared_secret[32], other_shared_secret[32];
unsigned char signature[64];
clock_t start;
clock_t end;
int i;
/* create a random seed, and a keypair out of that seed */
ed25519_create_seed(seed);
ed25519_create_keypair(public_key, private_key, seed);
/* create signature on the message with the keypair */
ed25519_sign(signature, message, strlen(message), public_key, private_key);
/* verify the signature */
if (ed25519_verify(signature, message, strlen(message), public_key)) {
printf("valid signature\n");
} else {
printf("invalid signature\n");
}
/* create scalar and add it to the keypair */
ed25519_create_seed(scalar);
ed25519_add_scalar(public_key, private_key, scalar);
/* create signature with the new keypair */
ed25519_sign(signature, message, strlen(message), public_key, private_key);
/* verify the signature with the new keypair */
if (ed25519_verify(signature, message, strlen(message), public_key)) {
printf("valid signature\n");
} else {
printf("invalid signature\n");
}
/* make a slight adjustment and verify again */
signature[44] ^= 0x10;
if (ed25519_verify(signature, message, strlen(message), public_key)) {
printf("did not detect signature change\n");
} else {
printf("correctly detected signature change\n");
}
/* generate two keypairs for testing key exchange */
ed25519_create_seed(seed);
ed25519_create_keypair(public_key, private_key, seed);
ed25519_create_seed(seed);
ed25519_create_keypair(other_public_key, other_private_key, seed);
/* create two shared secrets - from both perspectives - and check if they're equal */
ed25519_key_exchange(shared_secret, other_public_key, private_key);
ed25519_key_exchange(other_shared_secret, public_key, other_private_key);
for (i = 0; i < 32; ++i) {
if (shared_secret[i] != other_shared_secret[i]) {
printf("key exchange was incorrect\n");
break;
}
}
if (i == 32) {
printf("key exchange was correct\n");
}
/* test performance */
printf("testing seed generation performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_create_seed(seed);
}
end = clock();
printf("%fus per seed\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing key generation performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_create_keypair(public_key, private_key, seed);
}
end = clock();
printf("%fus per keypair\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing sign performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_sign(signature, message, strlen(message), public_key, private_key);
}
end = clock();
printf("%fus per signature\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing verify performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_verify(signature, message, strlen(message), public_key);
}
end = clock();
printf("%fus per signature\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing keypair scalar addition performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_add_scalar(public_key, private_key, scalar);
}
end = clock();
printf("%fus per keypair\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing public key scalar addition performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_add_scalar(public_key, NULL, scalar);
}
end = clock();
printf("%fus per key\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
printf("testing key exchange performance: ");
start = clock();
for (i = 0; i < 10000; ++i) {
ed25519_key_exchange(shared_secret, other_public_key, private_key);
}
end = clock();
printf("%fus per shared secret\n", ((double) ((end - start) * 1000)) / CLOCKS_PER_SEC / i * 1000);
return 0;
}
