org.spongycastle.jce.spec.ECParameterSpec Java Examples

The following examples show how to use org.spongycastle.jce.spec.ECParameterSpec. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: SpongyCryptography.java From Jabit with Apache License 2.0

6 votes

@Override
public boolean isSignatureValid(byte[] data, byte[] signature, Pubkey pubkey) {
    try {
        ECParameterSpec spec = new ECParameterSpec(
            EC_CURVE_PARAMETERS.getCurve(),
            EC_CURVE_PARAMETERS.getG(),
            EC_CURVE_PARAMETERS.getN(),
            EC_CURVE_PARAMETERS.getH(),
            EC_CURVE_PARAMETERS.getSeed()
        );

        ECPoint Q = keyToPoint(pubkey.getSigningKey());
        KeySpec keySpec = new ECPublicKeySpec(Q, spec);
        PublicKey publicKey = KeyFactory.getInstance(ALGORITHM_ECDSA, provider).generatePublic(keySpec);

        Signature sig = Signature.getInstance(ALGORITHM_ECDSA, provider);
        sig.initVerify(publicKey);
        sig.update(data);
        return sig.verify(signature);
    } catch (GeneralSecurityException e) {
        throw new ApplicationException(e);
    }
}

Example #2

Source File: SpongyCryptography.java From Jabit with Apache License 2.0

6 votes

@Override
public byte[] getSignature(byte[] data, PrivateKey privateKey) {
    try {
        ECParameterSpec spec = new ECParameterSpec(
            EC_CURVE_PARAMETERS.getCurve(),
            EC_CURVE_PARAMETERS.getG(),
            EC_CURVE_PARAMETERS.getN(),
            EC_CURVE_PARAMETERS.getH(),
            EC_CURVE_PARAMETERS.getSeed()
        );

        BigInteger d = keyToBigInt(privateKey.getPrivateSigningKey());
        KeySpec keySpec = new ECPrivateKeySpec(d, spec);
        java.security.PrivateKey privKey = KeyFactory.getInstance(ALGORITHM_ECDSA, provider)
            .generatePrivate(keySpec);

        Signature sig = Signature.getInstance(ALGORITHM_ECDSA, provider);
        sig.initSign(privKey);
        sig.update(data);
        return sig.sign();
    } catch (GeneralSecurityException e) {
        throw new ApplicationException(e);
    }
}

Example #3

Source File: KeyCodec.java From UAF with Apache License 2.0

5 votes

public static KeyPair generate() throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
    SecureRandom random = new SecureRandom();
    ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("secp256r1");
    KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA");
    g.initialize(ecSpec, random);
    return g.generateKeyPair();
}