Example usage for java.security MessageDigest clone

Introduction

In this page you can find the example usage for java.security MessageDigest clone.

Prototype

public Object clone() throws CloneNotSupportedException 

Source Link

Document

Returns a clone if the implementation is cloneable.

Usage

From source file:lucee.commons.digest.Hash.java

public static String hash(String str, String algorithm, int numIterations, char[] encoding)
        throws NoSuchAlgorithmException {
    try {//from   w  ww .java2s .  c o  m
        MessageDigest md = MessageDigest.getInstance(algorithm), mdc;
        for (int i = 0; i < numIterations; i++) {
            mdc = (MessageDigest) md.clone();
            mdc.reset();
            mdc.update(toBytes(str, CharsetUtil.UTF8));
            str = new String(enc(mdc.digest(), encoding));
        }
        return str;
    } catch (CloneNotSupportedException e) {
    }

    // if not possible to clone the MessageDigest create always a new instance
    for (int i = 0; i < numIterations; i++) {
        str = hash(str, algorithm, encoding, CharsetUtil.UTF8);
    }
    return str;
}

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From source file:com.squarespace.gibson.GibsonUtils.java

/**
 * Creates and returns a {@link MessageDigestFactory} for the given algorithm.
 *///w w  w  .j  av  a  2s  .c  o m
private static MessageDigestFactory newMessageDigestFactory(final String algorithm) {

    final MessageDigest md = DigestUtils.getDigest(algorithm);

    return new MessageDigestFactory() {
        @Override
        public MessageDigest newMessageDigest() {
            // It is faster to clone a MessageDigest than to look it up via SPI.
            try {
                return (MessageDigest) md.clone();
            } catch (CloneNotSupportedException err) {
                LOG.warn(Gibson.MARKER, "CloneNotSupportedException: {}", algorithm, err);
            }

            return DigestUtils.getDigest(algorithm);
        }
    };
}

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