Example usage for org.bouncycastle.math.ec ECCurve validatePoint

Introduction

In this page you can find the example usage for org.bouncycastle.math.ec ECCurve validatePoint.

Prototype

public ECPoint validatePoint(BigInteger x, BigInteger y) 

Source Link

Usage

From source file:org.gluu.com.ox_push2.u2f.v2.cert.KeyPairGeneratorImpl.java

License:MIT License

public KeyPair keyPairFromJson(String keyPairJson) throws U2FException {
    BigInteger x = null;//w  w  w  . j  a  va  2s  . co  m
    BigInteger y = null;
    BigInteger d = null;

    try {
        JSONObject jsonKeyPair = (JSONObject) new JSONTokener(keyPairJson).nextValue();

        JSONObject jsonPrivateKey = jsonKeyPair.getJSONObject("privateKey");
        d = new BigInteger(Utils.decodeHexString(jsonPrivateKey.getString("d")));

        JSONObject jsonPublicKey = jsonKeyPair.getJSONObject("publicKey");
        x = new BigInteger(Utils.decodeHexString(jsonPublicKey.getString("x")));
        y = new BigInteger(Utils.decodeHexString(jsonPublicKey.getString("y")));
    } catch (JSONException ex) {
        throw new U2FException("Failed to deserialize key pair from JSON", ex);
    } catch (DecoderException ex) {
        throw new U2FException("Failed to deserialize key pair from JSON", ex);
    }

    ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("secp256r1");

    ECCurve curve = ecSpec.getCurve();
    ECPoint validatePoint = curve.validatePoint(x, y);

    ECPublicKeySpec publicKeySpec = new ECPublicKeySpec(validatePoint, ecSpec);
    ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(d, ecSpec);

    KeyFactory keyFactory = null;
    try {
        keyFactory = KeyFactory.getInstance("ECDSA", BOUNCY_CASTLE_PROVIDER);
        PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
        PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

        return new KeyPair(publicKey, privateKey);
    } catch (NoSuchAlgorithmException ex) {
        throw new U2FException("Failed to deserialize key pair from JSON", ex);
    } catch (InvalidKeySpecException ex) {
        throw new U2FException("Failed to deserialize key pair from JSON", ex);
    }
}

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