Examples of java.security.spec.X509EncodedKeySpec

java.security.spec.X509EncodedKeySpec
This class represents the ASN.1 encoding of a public key, encoded according to the ASN.1 type SubjectPublicKeyInfo. The SubjectPublicKeyInfo syntax is defined in the X.509 standard as follows:
```
 SubjectPublicKeyInfo ::= SEQUENCE { algorithm AlgorithmIdentifier, subjectPublicKey BIT STRING } 
```
@author Jan Luehe @version 1.22, 11/17/05 @see java.security.Key @see java.security.KeyFactory @see KeySpec @see EncodedKeySpec @see PKCS8EncodedKeySpec @since 1.2


    private PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = Base64.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }

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    {
        SubjectPublicKeyInfo    subjectPKInfo = reqInfo.getSubjectPublicKeyInfo();


        try
        {
            X509EncodedKeySpec      xspec = new X509EncodedKeySpec(new DERBitString(subjectPKInfo).getBytes());
            AlgorithmIdentifier     keyAlg = subjectPKInfo.getAlgorithmId ();
            try {


                if (provider == null) {
                    return KeyFactory.getInstance(keyAlg.getObjectId().getId ()).generatePublic(xspec);

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        writeUTF(new String(Base64.encodeBase64(key.getEncoded())));
    }


    public X509EncodedKeySpec readKey() throws IOException {
        byte[] otherHalf = Base64.decodeBase64(readUTF());
        return new X509EncodedKeySpec(otherHalf);
    }

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    {
        PublicKey pubKey = null;
        try
        {
            KeyFactory KeyFac = KeyFactory.getInstance(getAlgorithm(asymAlgorithm));
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(encodedKey);
            pubKey = KeyFac.generatePublic(x509KeySpec);
        } catch (Exception e)
        {
            e.printStackTrace();
        }

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  public static byte[] serialize(PublicKey key) {
    return key.getEncoded();
  }


  public static PublicKey deserializePublicKey(byte[] keyData) {
    X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(keyData);


    KeyFactory keyFactory = getKeyFactory();


    PublicKey pubKey;
    try {

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        if(type.equals(KeyPairType.DSA)){
            throw new UnsupportedTypeException(type);
        }
        try {
            KeyFactory kf = KeyFactory.getInstance(type.alg);
            X509EncodedKeySpec xks = new X509EncodedKeySpec(pub);
            return kf.generatePublic(xks);
        } catch (NoSuchAlgorithmException e) {
            throw new Error(e); // Impossible?
        } catch (InvalidKeySpecException e) {
            throw new IllegalArgumentException(e); // Indicates passed in key is bogus

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     * @return ECPublicKey or null if it fails
     */
    public static ECPublicKey getPublicKey(byte[] data, Curves curve) {
        ECPublicKey remotePublicKey = null;
        try {
            X509EncodedKeySpec ks = new X509EncodedKeySpec(data);
            KeyFactory kf = KeyFactory.getInstance("EC", curve.kfProvider);
            remotePublicKey = (ECPublicKey)kf.generatePublic(ks);
            
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDSA.class, "NoSuchAlgorithmException : "+e.getMessage(),e);

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     * @return ECPublicKey or null if it fails
     */
    public static ECPublicKey getPublicKey(byte[] data, Curves curve) {
        ECPublicKey remotePublicKey = null;
        try {
            X509EncodedKeySpec ks = new X509EncodedKeySpec(data);
            KeyFactory kf = KeyFactory.getInstance("EC", curve.kfProvider);
            remotePublicKey = (ECPublicKey)kf.generatePublic(ks);
            
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDH.class, "NoSuchAlgorithmException : "+e.getMessage(),e);

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        //
        // public key encoding test
        //
        byte[]              pubEnc = aKeyPair.getPublic().getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance(algName, "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        DHPublicKey         pubKey = (DHPublicKey)keyFac.generatePublic(pubX509);
        DHParameterSpec     spec = pubKey.getParams();


        if (!spec.getG().equals(dhParams.getG()) || !spec.getP().equals(dhParams.getP()))
        {

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        //
        // public key encoding test
        //
        byte[]              pubEnc = aKeyPair.getPublic().getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance(algName, "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        DHPublicKey         pubKey = (DHPublicKey)keyFac.generatePublic(pubX509);
        DHParameterSpec     spec = pubKey.getParams();


        if (!spec.getG().equals(dhParams.getG()) || !spec.getP().equals(dhParams.getP()))
        {

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