Package org.spongycastle.crypto.signers

Examples of org.spongycastle.crypto.signers.ECDSASigner

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    public ECDSASignature doSign(byte[] input) {
        // No decryption of private key required.
        if (priv == null)
            throw new MissingPrivateKeyException();
        check(priv != null, "Private key must not be null");
        ECDSASigner signer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest()));
        ECPrivateKeyParameters privKey = new ECPrivateKeyParameters(priv, CURVE);
        signer.init(true, privKey);
        BigInteger[] components = signer.generateSignature(input);
        return new ECDSASignature(components[0], components[1]).toCanonicalised();
    }
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     * @param data      Hash of the data to verify.
     * @param signature signature.
     * @param pub       The public key bytes to use.
     */
    public static boolean verify(byte[] data, ECDSASignature signature, byte[] pub) {
        ECDSASigner signer = new ECDSASigner();
        ECPublicKeyParameters params = new ECPublicKeyParameters(CURVE.getCurve().decodePoint(pub), CURVE);
        signer.init(false, params);
        try {
            return signer.verifySignature(data, signature.r, signature.s);
        } catch (NullPointerException npe) {
            // Bouncy Castle contains a bug that can cause NPEs given specially crafted signatures.
          // Those signatures are inherently invalid/attack sigs so we just fail them here rather than crash the thread.
            logger.error("Caught NPE inside bouncy castle", npe);
            return false;
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        // Make a key that doesn't use deterministic signing, to make it easy for us to double spend with bitwise
        // different pledges.
        ECKey signingKey = new ECKey() {
            @Override
            protected ECDSASignature doSign(Sha256Hash input, BigInteger privateKeyForSigning) {
                ECDSASigner signer = new ECDSASigner();
                ECPrivateKeyParameters privKey = new ECPrivateKeyParameters(privateKeyForSigning, CURVE);
                signer.init(true, privKey);
                BigInteger[] components = signer.generateSignature(input.getBytes());
                return new ECDSASignature(components[0], components[1]).toCanonicalised();
            }
        };
        TransactionOutput output = doubleSpentTx.addOutput(Coin.COIN.divide(2), signingKey.toAddress(params));
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Related Classes of org.spongycastle.crypto.signers.ECDSASigner

  • lighthouse.model.LighthouseBackendTest
  • org.ethereum.crypto.ECKey
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