Example usage for javax.crypto KeyGenerator generateKey

Introduction

In this page you can find the example usage for javax.crypto KeyGenerator generateKey.

Prototype

public final SecretKey generateKey()

Source Link

Document

Generates a secret key.

Usage

From source file:org.geoserver.security.GeoServerSecurityManager.java

/**
 * Determines if strong encryption is available.
 * <p>/*from   w  ww .j  av a  2 s  . c  o  m*/
 * This method does the determination by trying to encrypt a value with AES 256 Bit encryption.
 * </p>
 * 
 * @return True if strong encryption avaialble, otherwise false.
 */
public boolean isStrongEncryptionAvailable() {
    if (strongEncryptionAvaialble != null)
        return strongEncryptionAvaialble;

    KeyGenerator kgen;
    try {
        kgen = KeyGenerator.getInstance("AES");
        kgen.init(256);
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        cipher.doFinal("This is just an example".getBytes());
        strongEncryptionAvaialble = true;
        LOGGER.info("Strong cryptograhpy is available");
    } catch (InvalidKeyException e) {
        strongEncryptionAvaialble = false;
        LOGGER.warning("Strong cryptograhpy is NOT available"
                + "\nDownload and install of policy files recommended"
                + "\nfrom http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html");
    } catch (Exception ex) {
        LOGGER.log(Level.WARNING, "Strong cryptograhpy is NOT available, unexpected error", ex);
        strongEncryptionAvaialble = false; //should not happen
    }
    return strongEncryptionAvaialble;
}