Example usage for javax.crypto.spec PBEKeySpec PBEKeySpec

Introduction

In this page you can find the example usage for javax.crypto.spec PBEKeySpec PBEKeySpec.

Prototype

public PBEKeySpec(char[] password)

Source Link

Document

Constructor that takes a password.

Usage

From source file:com.slamd.admin.AdminServlet.java

/**
 * Generates page content based on an MD5-digest of the query string.
 *
 * @param  requestInfo   The state information for this request.
 * @param  digestString  The base64-encoded MD5 digest of the query string to
 *                       use to generate the page.
 *//* w  w w .  j av  a 2 s  .  c o m*/
static void generatePageFromMD5(RequestInfo requestInfo, String digestString) {
    try {
        String dataFile = Constants.MD5_CONTENT_BASE_PATH + '/' + digestString;
        InputStream inputStream = slamdServer.getClass().getClassLoader().getResourceAsStream(dataFile);

        byte[] salt = { 0, 0, 0, 0, 0, 0, 0, 0 };
        char[] queryChars = requestInfo.request.getQueryString().toCharArray();
        int iterations = 1000;
        String cipherName = "PBEWithMD5AndDES";
        StringBuilder htmlBody = requestInfo.htmlBody;

        AlgorithmParameters algorithmParams = AlgorithmParameters.getInstance(cipherName);
        algorithmParams.init(new PBEParameterSpec(salt, iterations));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(cipherName);
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(queryChars));
        Cipher cipher = Cipher.getInstance(cipherName);
        cipher.init(Cipher.DECRYPT_MODE, key, algorithmParams);

        int bytesIn;
        int bytesOut;
        byte[] inBuffer = new byte[4096];
        byte[] outBuffer = new byte[8192];
        while ((bytesIn = inputStream.read(inBuffer)) > 0) {
            bytesOut = cipher.update(inBuffer, 0, bytesIn, outBuffer);
            htmlBody.append(new String(outBuffer, 0, bytesOut));
        }

        htmlBody.append(new String(cipher.doFinal()));
        inputStream.close();
    } catch (Exception e) {
        requestInfo.htmlBody.append(JobClass.stackTraceToString(e));
    }
}