Example usage for java.security.interfaces DSAParams getP

List of usage examples for java.security.interfaces DSAParams getP

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Introduction

In this page you can find the example usage for java.security.interfaces DSAParams getP.

Prototype

public BigInteger getP();

Source Link

Document

Returns the prime, p .

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.
 * // w w w.j  ava 2s  .  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;
}

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.
 *//*from  w w w .  j  ava2 s  .  c  om*/
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;
}

From source file:org.opensaml.xml.security.SecurityHelper.java

/**
 * Derives the public key from either a DSA or RSA private key.
 * //from  w ww  .j  a  va  2s  .c o  m
 * @param key the private key to derive the public key from
 * 
 * @return the derived public key
 * 
 * @throws KeyException thrown if the given private key is not a DSA or RSA key or there is a problem generating the
 *             public key
 */
public static PublicKey derivePublicKey(PrivateKey key) throws KeyException {
    KeyFactory factory;
    if (key instanceof DSAPrivateKey) {
        DSAPrivateKey dsaKey = (DSAPrivateKey) key;
        DSAParams keyParams = dsaKey.getParams();
        BigInteger y = keyParams.getQ().modPow(dsaKey.getX(), keyParams.getP());
        DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, keyParams.getP(), keyParams.getQ(),
                keyParams.getG());

        try {
            factory = KeyFactory.getInstance("DSA");
            return factory.generatePublic(pubKeySpec);
        } catch (GeneralSecurityException e) {
            throw new KeyException("Unable to derive public key from DSA private key", e);
        }
    } else if (key instanceof RSAPrivateCrtKey) {
        RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;
        RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(rsaKey.getModulus(), rsaKey.getPublicExponent());

        try {
            factory = KeyFactory.getInstance("RSA");
            return factory.generatePublic(pubKeySpec);
        } catch (GeneralSecurityException e) {
            throw new KeyException("Unable to derive public key from RSA private key", e);
        }
    } else {
        throw new KeyException("Private key was not a DSA or RSA key");
    }
}

From source file:uk.ac.ed.epcc.webapp.ssh.PublicKeyReaderUtil.java

/** format a key (of the types supported by the {@link #load(String)} method. 
 * //from  www.  j a  v a  2 s  .  c  o  m
 * @param key
 * @return public key string
 * @throws PublicKeyParseException 
 * @throws IOException 
 */
public static String format(PublicKey key) throws PublicKeyParseException, IOException {
    StringBuilder sb = new StringBuilder();
    String alg = key.getAlgorithm();
    if (alg.equalsIgnoreCase("RSA")) {
        RSAPublicKey pub = (RSAPublicKey) key;
        sb.append(SSH2_RSA_KEY);
        sb.append(" ");
        SSH2ByteBuffer buf = new SSH2ByteBuffer();
        buf.writeString(SSH2_RSA_KEY);
        buf.writeMPint(pub.getPublicExponent());
        buf.writeMPint(pub.getModulus());
        sb.append(Base64.encodeBase64String(buf.toByteArray()));
    } else if (alg.equalsIgnoreCase("DSA")) {
        DSAPublicKey pub = (DSAPublicKey) key;
        sb.append(SSH2_DSA_KEY);
        sb.append(" ");
        SSH2ByteBuffer buf = new SSH2ByteBuffer();
        buf.writeString(SSH2_DSA_KEY);
        DSAParams params = pub.getParams();
        buf.writeMPint(params.getP());
        buf.writeMPint(params.getQ());
        buf.writeMPint(params.getG());
        buf.writeMPint(pub.getY());
        sb.append(Base64.encodeBase64String(buf.toByteArray()));
    } else {
        throw new PublicKeyParseException(ErrorCode.UNKNOWN_PUBLIC_KEY_FILE_FORMAT);
    }
    return sb.toString();
}