public static boolean verify(
byte[] signature, byte[] message, byte[] publicKey, boolean enforceCanonical) {
try {
if (enforceCanonical && !Curve25519.isCanonicalSignature(signature)) {
Logger.logDebugMessage("Rejecting non-canonical signature");
return false;
}
if (enforceCanonical && !Curve25519.isCanonicalPublicKey(publicKey)) {
Logger.logDebugMessage("Rejecting non-canonical public key");
return false;
}
byte[] Y = new byte[32];
byte[] v = new byte[32];
System.arraycopy(signature, 0, v, 0, 32);
byte[] h = new byte[32];
System.arraycopy(signature, 32, h, 0, 32);
Curve25519.verify(Y, v, h, publicKey);
MessageDigest digest = Crypto.sha256();
byte[] m = digest.digest(message);
digest.update(m);
byte[] h2 = digest.digest(Y);
return Arrays.equals(h, h2);
} catch (RuntimeException e) {
Logger.logMessage("Error in Crypto verify", e);
return false;
}
}
private void loadPassPhrases() {
try {
List<String> passphrases =
Files.readAllLines(Paths.get("passphrases.txt"), Charset.forName("US-ASCII"));
for (String ps : passphrases) {
if (!ps.isEmpty()) {
byte[] publicKey = Crypto.getPublicKey(ps);
byte[] publicKeyHash = Crypto.sha256().digest(publicKey);
Long id = Convert.fullHashToId(publicKeyHash);
loadedPassPhrases.put(id, ps);
LOGGER.info("Added key: {" + ps + "} -> {" + Convert.toUnsignedLong(id) + "}");
}
}
} catch (IOException e) {
LOGGER.info("Warning: no passphrases.txt found");
}
}
@Override
JSONStreamAware processRequest(HttpServletRequest req) throws NxtException.ValidationException {
String transactionBytes = Convert.emptyToNull(req.getParameter("unsignedTransactionBytes"));
String transactionJSON = Convert.emptyToNull(req.getParameter("unsignedTransactionJSON"));
if (transactionBytes == null && transactionJSON == null) {
return MISSING_UNSIGNED_BYTES;
}
String secretPhrase = Convert.emptyToNull(req.getParameter("secretPhrase"));
if (secretPhrase == null) {
return MISSING_SECRET_PHRASE;
}
try {
Transaction transaction;
if (transactionBytes != null) {
byte[] bytes = Convert.parseHexString(transactionBytes);
transaction = Nxt.getTransactionProcessor().parseTransaction(bytes);
} else {
JSONObject json = (JSONObject) JSONValue.parse(transactionJSON);
transaction = Nxt.getTransactionProcessor().parseTransaction(json);
}
transaction.validate();
if (transaction.getSignature() != null) {
JSONObject response = new JSONObject();
response.put("errorCode", 4);
response.put(
"errorDescription",
"Incorrect \"unsignedTransactionBytes\" - transaction is already signed");
return response;
}
transaction.sign(secretPhrase);
JSONObject response = new JSONObject();
response.put("transaction", transaction.getStringId());
response.put("fullHash", transaction.getFullHash());
response.put("transactionBytes", Convert.toHexString(transaction.getBytes()));
response.put(
"signatureHash", Convert.toHexString(Crypto.sha256().digest(transaction.getSignature())));
response.put("verify", transaction.verifySignature());
return response;
} catch (NxtException.ValidationException | RuntimeException e) {
// Logger.logDebugMessage(e.getMessage(), e);
return INCORRECT_UNSIGNED_BYTES;
}
}
public static byte[] getPublicKey(String secretPhrase) {
try {
byte[] publicKey = new byte[32];
Curve25519.keygen(publicKey, null, Crypto.sha256().digest(secretPhrase.getBytes("UTF-8")));
if (!Curve25519.isCanonicalPublicKey(publicKey)) {
throw new RuntimeException("Public key not canonical");
}
return publicKey;
} catch (RuntimeException | UnsupportedEncodingException e) {
Logger.logMessage("Error getting public key", e);
return null;
}
}
public static byte[] sign(byte[] message, String secretPhrase) {
try {
byte[] P = new byte[32];
byte[] s = new byte[32];
MessageDigest digest = Crypto.sha256();
Curve25519.keygen(P, s, digest.digest(secretPhrase.getBytes("UTF-8")));
byte[] m = digest.digest(message);
digest.update(m);
byte[] x = digest.digest(s);
byte[] Y = new byte[32];
Curve25519.keygen(Y, null, x);
digest.update(m);
byte[] h = digest.digest(Y);
byte[] v = new byte[32];
Curve25519.sign(v, h, x, s);
byte[] signature = new byte[64];
System.arraycopy(v, 0, signature, 0, 32);
System.arraycopy(h, 0, signature, 32, 32);
if (!Curve25519.isCanonicalSignature(signature)) {
throw new RuntimeException("Signature not canonical");
}
return signature;
} catch (RuntimeException | UnsupportedEncodingException e) {
Logger.logMessage("Error in signing message", e);
return null;
}
}
public static long getId(byte[] publicKey) {
byte[] publicKeyHash = Crypto.sha256().digest(publicKey);
return Convert.fullHashToId(publicKeyHash);
}
