Example usage for java.security.spec ECFieldFp getP

Introduction

In this page you can find the example usage for java.security.spec ECFieldFp getP.

Prototype

public BigInteger getP() 

Source Link

Document

Returns the prime p of this prime finite field.

Usage

From source file:org.cesecore.keys.util.KeyTools.java

/**
 * Gets the key AlgorithmParameterSpec of supported keys. Can be used to initialize a KeyPairGenerator to generate a key of equal type and size.
 * /*from  www .ja v  a  2  s.c om*/
 * @param pk
 *            PublicKey used to derive the AlgorithmParameterSpec
 * @return null if key is unsupported or pk is null, otherwise a AlgorithmParameterSpec.
 */
public static AlgorithmParameterSpec getKeyGenSpec(final PublicKey pk) {
    if (pk == null) {
        return null;
    }
    AlgorithmParameterSpec ret = null;
    if (pk instanceof RSAPublicKey) {
        log.debug("getKeyGenSpec: RSA");
        final RSAPublicKey rpk = (RSAPublicKey) pk;
        ret = new RSAKeyGenParameterSpec(getKeyLength(pk), rpk.getPublicExponent());
    } else if (pk instanceof DSAPublicKey) {
        log.debug("getKeyGenSpec: DSA");
        final DSAPublicKey dpk = (DSAPublicKey) pk;
        final DSAParams params = dpk.getParams();
        ret = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
    } else if (pk instanceof ECPublicKey) {
        log.debug("getKeyGenSpec: ECPublicKey");
        final ECPublicKey ecpub = (ECPublicKey) pk;
        final java.security.spec.ECParameterSpec sunsp = ecpub.getParams();
        final EllipticCurve ecurve = new EllipticCurve(sunsp.getCurve().getField(), sunsp.getCurve().getA(),
                sunsp.getCurve().getB());
        // ECParameterSpec par = new ECNamedCurveSpec(null, sunsp.getCurve(), sunsp.getGenerator(), sunsp.getOrder(),
        // BigInteger.valueOf(sunsp.getCofactor()));
        final ECParameterSpec params = new ECParameterSpec(ecurve, sunsp.getGenerator(), sunsp.getOrder(),
                sunsp.getCofactor());
        if (log.isDebugEnabled()) {
            log.debug("Fieldsize: " + params.getCurve().getField().getFieldSize());
            final EllipticCurve curve = params.getCurve();
            log.debug("CurveA: " + curve.getA().toString(16));
            log.debug("CurveB: " + curve.getB().toString(16));
            log.debug("CurveSeed: " + curve.getSeed());
            final ECFieldFp field = (ECFieldFp) curve.getField();
            log.debug("CurveSfield: " + field.getP().toString(16));
            final ECPoint p = params.getGenerator();
            log.debug("Generator: " + p.getAffineX().toString(16) + ", " + p.getAffineY().toString(16));
            log.debug("Order: " + params.getOrder().toString(16));
            log.debug("CoFactor: " + params.getCofactor());
        }
        ret = params;
    } else if (pk instanceof JCEECPublicKey) {
        log.debug("getKeyGenSpec: JCEECPublicKey");
        final JCEECPublicKey ecpub = (JCEECPublicKey) pk;
        final org.bouncycastle.jce.spec.ECParameterSpec bcsp = ecpub.getParameters();
        final ECCurve curve = bcsp.getCurve();
        // TODO: this probably does not work for key generation with the Sun PKCS#11 provider. Maybe seed needs to be set to null as above? Or
        // something else, the BC curve is it the same?
        final ECParameterSpec params = new ECNamedCurveSpec(null, curve, bcsp.getG(), bcsp.getN(), bcsp.getH());
        ret = params;
        // EllipticCurve ecc = new EllipticCurve(curve.)
        // ECParameterSpec sp = new ECParameterSpec(, bcsp.getG(), bcsp.getN(), bcsp.getH().intValue());
    }
    return ret;
}

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From source file:org.ejbca.util.keystore.KeyTools.java

/**
 * Gets the key AlgorithmParameterSpec of supported keys. Can be used to initialize a KeyPairGenerator to generate a key of equal type and size.
 * @param pk PublicKey used to derive the AlgorithmParameterSpec
 * @return null if key is unsupported or pk is null, otherwise a AlgorithmParameterSpec.
 *///  w w  w. ja  va 2  s.co m
public static AlgorithmParameterSpec getKeyGenSpec(final PublicKey pk) {
    if (pk == null) {
        return null;
    }
    AlgorithmParameterSpec ret = null;
    if (pk instanceof RSAPublicKey) {
        log.debug("getKeyGenSpec: RSA");
        final RSAPublicKey rpk = (RSAPublicKey) pk;
        ret = new RSAKeyGenParameterSpec(getKeyLength(pk), rpk.getPublicExponent());
    } else if (pk instanceof DSAPublicKey) {
        log.debug("getKeyGenSpec: DSA");
        final DSAPublicKey dpk = (DSAPublicKey) pk;
        final DSAParams params = dpk.getParams();
        ret = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
    } else if (pk instanceof ECPublicKey) {
        log.debug("getKeyGenSpec: ECPublicKey");
        final ECPublicKey ecpub = (ECPublicKey) pk;
        final java.security.spec.ECParameterSpec sunsp = ecpub.getParams();
        final EllipticCurve ecurve = new EllipticCurve(sunsp.getCurve().getField(), sunsp.getCurve().getA(),
                sunsp.getCurve().getB());
        //ECParameterSpec par = new ECNamedCurveSpec(null, sunsp.getCurve(), sunsp.getGenerator(), sunsp.getOrder(), BigInteger.valueOf(sunsp.getCofactor()));
        final ECParameterSpec params = new ECParameterSpec(ecurve, sunsp.getGenerator(), sunsp.getOrder(),
                sunsp.getCofactor());
        if (log.isDebugEnabled()) {
            log.debug("Fieldsize: " + params.getCurve().getField().getFieldSize());
            final EllipticCurve curve = params.getCurve();
            log.debug("CurveA: " + curve.getA().toString(16));
            log.debug("CurveB: " + curve.getB().toString(16));
            log.debug("CurveSeed: " + curve.getSeed());
            final ECFieldFp field = (ECFieldFp) curve.getField();
            log.debug("CurveSfield: " + field.getP().toString(16));
            final ECPoint p = params.getGenerator();
            log.debug("Generator: " + p.getAffineX().toString(16) + ", " + p.getAffineY().toString(16));
            log.debug("Order: " + params.getOrder().toString(16));
            log.debug("CoFactor: " + params.getCofactor());
        }
        ret = params;
    } else if (pk instanceof JCEECPublicKey) {
        log.debug("getKeyGenSpec: JCEECPublicKey");
        final JCEECPublicKey ecpub = (JCEECPublicKey) pk;
        final org.bouncycastle.jce.spec.ECParameterSpec bcsp = ecpub.getParameters();
        final ECCurve curve = bcsp.getCurve();
        //TODO: this probably does not work for key generation with the Sun PKCS#11 provider. Maybe seed needs to be set to null as above? Or something else, the BC curve is it the same?
        final ECParameterSpec params = new ECNamedCurveSpec(null, curve, bcsp.getG(), bcsp.getN(), bcsp.getH());
        ret = params;
        //EllipticCurve ecc = new EllipticCurve(curve.)
        //ECParameterSpec sp = new ECParameterSpec(, bcsp.getG(), bcsp.getN(), bcsp.getH().intValue());
    }
    return ret;
}

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