Java Utililty Methods Key Public

List of utility methods to do Key Public

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Description

The list of methods to do Key Public are organized into topic(s).

Method

PublicKeygetPublicKey(String publicKeyContents)
Returns the public key for the given key. 
PublicKey publicKey = null;
try {
    byte[] decodeKeyBytes = decodeToBase64Bytes(publicKeyContents);
    KeyFactory keyFactory = KeyFactory.getInstance(ALGO_RSA);
    X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(decodeKeyBytes);
    publicKey = keyFactory.generatePublic(publicKeySpec);
} catch (NoSuchAlgorithmException ex) {
    System.err.println(ex);
...
RSAPublicKeygetPublicKey(String publicKeyFile)
get Public Key 
ObjectInputStream publicKeyInputStream;
try {
    publicKeyInputStream = new ObjectInputStream(new FileInputStream(publicKeyFile));
    RSAPublicKey publicKey = (RSAPublicKey) publicKeyInputStream.readObject();
    publicKeyInputStream.close();
    return publicKey;
} catch (IOException e) {
    e.printStackTrace();
...
PublicKeygetPublicKey(String publicKeyFilepath, String algorithm)
Creates a PublicKey from the specified public key file and algorithm. 
InputStream pubKey = null;
try {
    URL url = new URL(publicKeyFilepath);
    pubKey = url.openStream();
} catch (MalformedURLException e) {
    pubKey = new FileInputStream(publicKeyFilepath);
byte[] bytes = new byte[pubKey.available()];
...
PublicKeygetPublicKeyFromBytes(final String algorithm, final byte[] publicKeyBytes)
get Public Key From Bytes 
try {
    final KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
    final X509EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
    return keyFactory.generatePublic(spec);
} catch (Throwable t) {
    t.printStackTrace();
return null;
...
PublicKeygetPublicKeyFromFile(File cert, String alias, String password)
get Public Key From File 
KeyStore ks = KeyStore.getInstance("JKS");
char[] pwd = password.toCharArray();
InputStream is = new FileInputStream(cert);
ks.load(is, pwd);
Key key = ks.getKey(alias, pwd);
Certificate c = ks.getCertificate(alias);
PublicKey p = c.getPublicKey();
return p;
...
PublicKeygetPublicKeyFromPEMFile(String fileName, String jceProvider)
Reads the public key from a PEM formatted file (via the cert) 
_jceProvider = jceProvider;
if (_debug) {
    System.out.println("getPublicKeyFromPEMFile: Reading public key from " + fileName);
return getCertFromPEMFile(fileName, _jceProvider).getPublicKey();
RSAPublicKeygetPublicKeyFromString(String certificateString)
Get RSA public key from X.509 certificate string (full crt file content, including header and footer) 
CertificateFactory fact = CertificateFactory.getInstance("X.509");
ByteArrayInputStream is = new ByteArrayInputStream(certificateString.getBytes("UTF8"));
X509Certificate cer = (X509Certificate) fact.generateCertificate(is);
return (RSAPublicKey) cer.getPublicKey();
StringgetPublicKeyModulus(RSAPublicKey publicKey)
get Public Key Modulus 
return publicKey.getModulus().toString(16);
RSAPublicKeySpecgetPublicKeySpec(KeyPair kp)
get Public Key Spec 
KeyFactory fact = KeyFactory.getInstance("RSA");
RSAPublicKeySpec pub = fact.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);
return pub;
MethodgetPublicPutMethodForResultClass(final Class resultClass)
Convenience method to return the put(Object, Object method for the result class. 
return (Method) AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        try {
            return resultClass.getMethod("put", classArrayObjectObject);
        } catch (NoSuchMethodException ex) {
            return null;
});