JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_curve25519_NativeCurve25519Provider_calculateSignature
(JNIEnv *env, jobject obj, jbyteArray random, jbyteArray privateKey, jbyteArray message)
{
jbyteArray signature = (*env)->NewByteArray(env, 64);
uint8_t* signatureBytes = (uint8_t*)(*env)->GetByteArrayElements(env, signature, 0);
uint8_t* randomBytes = (uint8_t*)(*env)->GetByteArrayElements(env, random, 0);
uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
uint8_t* messageBytes = (uint8_t*)(*env)->GetByteArrayElements(env, message, 0);
jsize messageLength = (*env)->GetArrayLength(env, message);
int result = curve25519_sign(signatureBytes, privateKeyBytes, messageBytes, messageLength, randomBytes);
(*env)->ReleaseByteArrayElements(env, signature, signatureBytes, 0);
(*env)->ReleaseByteArrayElements(env, random, randomBytes, 0);
(*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
(*env)->ReleaseByteArrayElements(env, message, messageBytes, 0);
if (result == 0) return signature;
else (*env)->ThrowNew(env, (*env)->FindClass(env, "java/lang/AssertionError"), "Signature failed!");
return 0;
}
int curvesigs_fast_test(int silent)
{
unsigned char signature_correct[64] = {
0xcf, 0x87, 0x3d, 0x03, 0x79, 0xac, 0x20, 0xe8,
0x89, 0x3e, 0x55, 0x67, 0xee, 0x0f, 0x89, 0x51,
0xf8, 0xdb, 0x84, 0x0d, 0x26, 0xb2, 0x43, 0xb4,
0x63, 0x52, 0x66, 0x89, 0xd0, 0x1c, 0xa7, 0x18,
0xac, 0x18, 0x9f, 0xb1, 0x67, 0x85, 0x74, 0xeb,
0xdd, 0xe5, 0x69, 0x33, 0x06, 0x59, 0x44, 0x8b,
0x0b, 0xd6, 0xc1, 0x97, 0x3f, 0x7d, 0x78, 0x0a,
0xb3, 0x95, 0x18, 0x62, 0x68, 0x03, 0xd7, 0x82,
};
const int MSG_LEN = 200;
unsigned char privkey[32];
unsigned char pubkey[32];
unsigned char signature[64];
unsigned char msg[MSG_LEN];
unsigned char random[64];
memset(privkey, 0, 32);
memset(pubkey, 0, 32);
memset(signature, 0, 64);
memset(msg, 0, MSG_LEN);
memset(random, 0, 64);
privkey[8] = 189; /* just so there's some bits set */
sc_clamp(privkey);
/* Signature vector test */
curve25519_keygen(pubkey, privkey);
curve25519_sign(signature, privkey, msg, MSG_LEN, random);
TEST("Curvesig sign", memcmp(signature, signature_correct, 64) == 0);
TEST("Curvesig verify #1", curve25519_verify(signature, pubkey, msg, MSG_LEN) == 0);
signature[0] ^= 1;
TEST("Curvesig verify #2", curve25519_verify(signature, pubkey, msg, MSG_LEN) != 0);
return 0;
}
int curvesigs_slow_test(int silent, int iterations)
{
unsigned char signature_10k_correct[64] = {
0xfc, 0xba, 0x55, 0xc4, 0x85, 0x4a, 0x42, 0x25,
0x19, 0xab, 0x08, 0x8d, 0xfe, 0xb5, 0x13, 0xb6,
0x0d, 0x24, 0xbb, 0x16, 0x27, 0x55, 0x71, 0x48,
0xdd, 0x20, 0xb1, 0xcd, 0x2a, 0xd6, 0x7e, 0x35,
0xef, 0x33, 0x4c, 0x7b, 0x6d, 0x94, 0x6f, 0x52,
0xec, 0x43, 0xd7, 0xe6, 0x35, 0x24, 0xcd, 0x5b,
0x5d, 0xdc, 0xb2, 0x32, 0xc6, 0x22, 0x53, 0xf3,
0x38, 0x02, 0xf8, 0x28, 0x28, 0xc5, 0x65, 0x05,
};
int count;
const int MSG_LEN = 200;
unsigned char privkey[32];
unsigned char pubkey[32];
unsigned char signature[64];
unsigned char msg[MSG_LEN];
unsigned char random[64];
memset(privkey, 0, 32);
memset(pubkey, 0, 32);
memset(signature, 0, 64);
memset(msg, 0, MSG_LEN);
memset(random, 0, 64);
/* Signature random test */
INFO("Pseudorandom curvesigs...\n");
for (count = 1; count <= iterations; count++) {
unsigned char b[64];
crypto_hash_sha512(b, signature, 64);
memmove(privkey, b, 32);
crypto_hash_sha512(b, privkey, 32);
memmove(random, b, 64);
sc_clamp(privkey);
curve25519_keygen(pubkey, privkey);
curve25519_sign(signature, privkey, msg, MSG_LEN, random);
if (curve25519_verify(signature, pubkey, msg, MSG_LEN) != 0)
ERROR("Curvesig verify failure #1 %d\n", count);
if (b[63] & 1)
signature[count % 64] ^= 1;
else
msg[count % MSG_LEN] ^= 1;
if (curve25519_verify(signature, pubkey, msg, MSG_LEN) == 0)
ERROR("Curvesig verify failure #2 %d\n", count);
if (count == 10000) {
if (memcmp(signature, signature_10k_correct, 64) != 0)
ERROR("Curvesig signature 10K doesn't match %d\n", count);
}
if (count == 100000)
print_bytes("100K curvesigs", signature, 64);
if (count == 1000000)
print_bytes("1M curvesigs", signature, 64);
if (count == 10000000)
print_bytes("10M curvesigs", signature, 64);
}
INFO("good\n");
return 0;
}
void Curve25519::calculateSignature(const unsigned char *privatekey, const unsigned char *message, const unsigned long messagelen, const unsigned char *random, unsigned char *signature)
{
curve25519_sign(signature, privatekey, message, messagelen, random);
}
