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

            {
                KeyFactory kf = KeyFactory.getInstance(wrappedKeyAlgorithm, "BC");


                if (wrappedKeyType == Cipher.PUBLIC_KEY)
                {
                    return kf.generatePublic(new X509EncodedKeySpec(encoded));
                }
                else if (wrappedKeyType == Cipher.PRIVATE_KEY)
                {
                    return kf.generatePrivate(new PKCS8EncodedKeySpec(encoded));
                }

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        {
            spec = new PKCS8EncodedKeySpec(enc);
        }
        else if (format.equals("X.509") || format.equals("X509"))
        {
            spec = new X509EncodedKeySpec(enc);
        }
        else if (format.equals("RAW"))
        {
            return new SecretKeySpec(enc, algorithm);
        }

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        //
        // key encoding test - BC decoding Sun keys
        //
        KeyFactory          f = KeyFactory.getInstance("DSA", "BC");
        X509EncodedKeySpec  x509s = new X509EncodedKeySpec(vKey.getEncoded());


        DSAPublicKey        k1 = (DSAPublicKey)f.generatePublic(x509s);


        checkPublic(k1, vKey);
        
        PKCS8EncodedKeySpec  pkcs8 = new PKCS8EncodedKeySpec(sKey.getEncoded());


        DSAPrivateKey        k2 = (DSAPrivateKey)f.generatePrivate(pkcs8);


        checkPrivateKey(k2, sKey);
        
        //
        // key decoding test - SUN decoding BC keys
        // 
        f = KeyFactory.getInstance("DSA", "SUN");
        x509s = new X509EncodedKeySpec(k1.getEncoded());
        
        vKey = (DSAPublicKey)f.generatePublic(x509s);


        checkPublic(k1, vKey);

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


        if (!pubKey.getW().equals(((ECPublicKey)aKeyPair.getPublic()).getW()))
        {
            fail("public key encoding (Q test) failed");

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        //
        // public key encoding test
        //
        byte[]              pubEnc = vKey.getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance("ECDH", "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        ECPublicKey         pubKey = (ECPublicKey)keyFac.generatePublic(pubX509);


        if (!pubKey.getW().equals(((ECPublicKey)vKey).getW()))
        {
            fail("public key encoding (Q test) failed");

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        //
        // public key encoding test
        //
        byte[]              pubEnc = vKey.getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance("ECGOST3410", "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        ECPublicKey         pubKey = (ECPublicKey)keyFac.generatePublic(pubX509);


        if (!pubKey.getW().equals(((ECPublicKey)vKey).getW()))
        {
            fail("public key encoding (Q test) failed");

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            NamingException ne = new NamingException( I18n.err( I18n.ERR_289 ) );
            ne.setRootCause( e );
            throw ne;
        }
    
        EncodedKeySpec publicKeySpec = new X509EncodedKeySpec( entry.get( PUBLIC_KEY_AT ).getBytes() );
        try
        {
            publicKey = keyFactory.generatePublic( publicKeySpec );
        }
        catch ( InvalidKeySpecException e )

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    private RSAPublicKey getKey() {
        try {
            if (key == null) {
                KeyFactory keyFactory = KeyFactory.getInstance("RSA");
                key = (RSAPublicKey)keyFactory.generatePublic(new X509EncodedKeySpec(Util.fromHexString(keyImage)));
            }
            return key;
        } catch (GeneralSecurityException e) {
            throw new Error(e); // impossible
        }

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     * @return decoded key
     * 
     * @throws KeyException thrown if the key can not be decoded
     */
    public static PublicKey decodePublicKey(byte[] key, char[] password) throws KeyException {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(key);
        try {
            return buildKey(keySpec, "RSA");
        }
        catch (KeyException ex) {
        }

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     * @param base64EncodedKey base64-encoded DSA public key
     * @return a native Java DSAPublicKey
     * @throws KeyException thrown if there is an error constructing key
     */
    public static DSAPublicKey buildJavaDSAPublicKey(String base64EncodedKey) throws KeyException {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(Base64.decode(base64EncodedKey));
        return (DSAPublicKey) buildKey(keySpec, "DSA");
    }

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