Examples with EllipticCurve java.security.spec.EllipticCurve used on opensource projects

Example 61 with EllipticCurve

use of java.security.spec.EllipticCurve in project jmulticard by ctt-gob-es.

the class JseCryptoHelper method toSpongyCastleECCurve.

private static ECCurve toSpongyCastleECCurve(final ECParameterSpec params) {
    final EllipticCurve curve = params.getCurve();
    final ECField field = curve.getField();
    if (!(field instanceof ECFieldFp)) {
        throw new IllegalArgumentException(// $NON-NLS-1$
        "Solo se soporta 'ECFieldFp' y se proporciono  " + field.getClass().getCanonicalName());
    }
    final int coFactor = params.getCofactor();
    final BigInteger order = params.getOrder();
    final BigInteger a = curve.getA();
    final BigInteger b = curve.getB();
    final BigInteger p = getPrime(params);
    return new ECCurve.Fp(p, a, b, order, BigInteger.valueOf(coFactor));
}

Example 62 with EllipticCurve

use of java.security.spec.EllipticCurve in project jmulticard by ctt-gob-es.

the class JseCryptoHelper method mapNonceGMWithECDH.

private static ECParameterSpec mapNonceGMWithECDH(final BigInteger nonceS, final ECPoint sharedSecretPointH, final ECParameterSpec params) {
    // D~ = (p, a, b, G~, n, h) where G~ = [s]G + H
    final ECPoint generator = params.getGenerator();
    final EllipticCurve curve = params.getCurve();
    final BigInteger a = curve.getA();
    final BigInteger b = curve.getB();
    final ECFieldFp field = (ECFieldFp) curve.getField();
    final BigInteger p = field.getP();
    final BigInteger order = params.getOrder();
    final int cofactor = params.getCofactor();
    final ECPoint ephemeralGenerator = add(multiply(nonceS, generator, params), sharedSecretPointH, params);
    if (!toSpongyCastleECPoint(ephemeralGenerator, params).isValid()) {
        // $NON-NLS-1$
        LOGGER.warning("Se ha generado un punto invalido");
    }
    return new ECParameterSpec(new EllipticCurve(new ECFieldFp(p), a, b), ephemeralGenerator, order, cofactor);
}

Example 63 with EllipticCurve

use of java.security.spec.EllipticCurve in project i2p.i2p by i2p.

the class KeyGenerator method getSigningPublicKey.

/**
 * Convert a SigningPrivateKey to a SigningPublicKey.
 *  As of 0.9.16, supports all key types.
 *
 * @param priv a SigningPrivateKey object
 * @return a SigningPublicKey object
 * @throws IllegalArgumentException on bad key or unknown type
 */
public static SigningPublicKey getSigningPublicKey(SigningPrivateKey priv) {
    SigType type = priv.getType();
    if (type == null)
        throw new IllegalArgumentException("Unknown type");
    try {
        switch(type.getBaseAlgorithm()) {
            case DSA:
                BigInteger x = new NativeBigInteger(1, priv.toByteArray());
                BigInteger y = CryptoConstants.dsag.modPow(x, CryptoConstants.dsap);
                SigningPublicKey pub = new SigningPublicKey();
                pub.setData(SigUtil.rectify(y, SigningPublicKey.KEYSIZE_BYTES));
                return pub;
            case EC:
                ECPrivateKey ecpriv = SigUtil.toJavaECKey(priv);
                BigInteger s = ecpriv.getS();
                ECParameterSpec spec = (ECParameterSpec) type.getParams();
                EllipticCurve curve = spec.getCurve();
                ECPoint g = spec.getGenerator();
                ECPoint w = ECUtil.scalarMult(g, s, curve);
                ECPublicKeySpec ecks = new ECPublicKeySpec(w, ecpriv.getParams());
                KeyFactory eckf = KeyFactory.getInstance("EC");
                ECPublicKey ecpub = (ECPublicKey) eckf.generatePublic(ecks);
                return SigUtil.fromJavaKey(ecpub, type);
            case RSA:
                RSAPrivateKey rsapriv = SigUtil.toJavaRSAKey(priv);
                BigInteger exp = ((RSAKeyGenParameterSpec) type.getParams()).getPublicExponent();
                RSAPublicKeySpec rsaks = new RSAPublicKeySpec(rsapriv.getModulus(), exp);
                KeyFactory rsakf = KeyFactory.getInstance("RSA");
                RSAPublicKey rsapub = (RSAPublicKey) rsakf.generatePublic(rsaks);
                return SigUtil.fromJavaKey(rsapub, type);
            case EdDSA:
                EdDSAPrivateKey epriv = SigUtil.toJavaEdDSAKey(priv);
                EdDSAPublicKey epub = new EdDSAPublicKey(new EdDSAPublicKeySpec(epriv.getA(), epriv.getParams()));
                return SigUtil.fromJavaKey(epub, type);
            default:
                throw new IllegalArgumentException("Unsupported algorithm");
        }
    } catch (GeneralSecurityException gse) {
        throw new IllegalArgumentException("Conversion failed", gse);
    }
}

Example 64 with EllipticCurve

use of java.security.spec.EllipticCurve in project wycheproof by google.

the class EcUtil method getBrainpoolP224r1Params.

public static ECParameterSpec getBrainpoolP224r1Params() {
    // name = "brainpoolP224r1",
    // oid = '2b2403030208010105',
    // ref = "RFC 5639",
    BigInteger p = new BigInteger("D7C134AA264366862A18302575D1D787B09F075797DA89F57EC8C0FF", 16);
    BigInteger a = new BigInteger("68A5E62CA9CE6C1C299803A6C1530B514E182AD8B0042A59CAD29F43", 16);
    BigInteger b = new BigInteger("2580F63CCFE44138870713B1A92369E33E2135D266DBB372386C400B", 16);
    BigInteger x = new BigInteger("0D9029AD2C7E5CF4340823B2A87DC68C9E4CE3174C1E6EFDEE12C07D", 16);
    BigInteger y = new BigInteger("58AA56F772C0726F24C6B89E4ECDAC24354B9E99CAA3F6D3761402CD", 16);
    BigInteger n = new BigInteger("D7C134AA264366862A18302575D0FB98D116BC4B6DDEBCA3A5A7939F", 16);
    final int h = 1;
    ECFieldFp fp = new ECFieldFp(p);
    EllipticCurve curve = new EllipticCurve(fp, a, b);
    ECPoint g = new ECPoint(x, y);
    return new ECParameterSpec(curve, g, n, h);
}

Example 65 with EllipticCurve

use of java.security.spec.EllipticCurve in project wycheproof by google.

the class EcUtil method decompressPoint.

/**
 * Decompress a point on an elliptic curve.
 *
 * @param bytes The compressed point. Its representation is z || x where z is 2+lsb(y) and x is
 *     using a unsigned fixed length big-endian representation.
 * @param ecParams the specification of the curve. Only Weierstrass curves over prime order fields
 *     are implemented.
 */
public static ECPoint decompressPoint(byte[] bytes, ECParameterSpec ecParams) throws GeneralSecurityException {
    EllipticCurve ec = ecParams.getCurve();
    ECField field = ec.getField();
    if (!(field instanceof ECFieldFp)) {
        throw new GeneralSecurityException("Only curves over prime order fields are supported");
    }
    BigInteger p = ((java.security.spec.ECFieldFp) field).getP();
    int expectedLength = 1 + (p.bitLength() + 7) / 8;
    if (bytes.length != expectedLength) {
        throw new GeneralSecurityException("compressed point has wrong length");
    }
    boolean lsb;
    switch(bytes[0]) {
        case 2:
            lsb = false;
            break;
        case 3:
            lsb = true;
            break;
        default:
            throw new GeneralSecurityException("Invalid format");
    }
    BigInteger x = new BigInteger(1, Arrays.copyOfRange(bytes, 1, bytes.length));
    if (x.compareTo(BigInteger.ZERO) == -1 || x.compareTo(p) != -1) {
        throw new GeneralSecurityException("x is out of range");
    }
    // Compute rhs == x^3 + a x + b (mod p)
    BigInteger rhs = x.multiply(x).add(ec.getA()).multiply(x).add(ec.getB()).mod(p);
    BigInteger y = modSqrt(rhs, p);
    if (lsb != y.testBit(0)) {
        y = p.subtract(y).mod(p);
    }
    return new ECPoint(x, y);
}