Java Digest digest(InputStream input, String algorithm)

Description

digest

License

Apache License

Declaration

public static String digest(InputStream input, String algorithm) throws IOException, NoSuchAlgorithmException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.IOException;
import java.io.InputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import com.google.common.base.Stopwatch;

public class Main {
    public static String digest(InputStream input, String algorithm) throws IOException, NoSuchAlgorithmException {
        Stopwatch sw = Stopwatch.createStarted();
        int bufferSize = 256 * 1024;
        MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
        try (DigestInputStream digestInputStream = new DigestInputStream(input, messageDigest);) {
            byte[] buffer = new byte[bufferSize];
            while (digestInputStream.read(buffer) > 0) {
                ;//from www  . j a  v a 2  s .c  o  m
            }
            messageDigest = digestInputStream.getMessageDigest();
            byte[] resultByteArray = messageDigest.digest();
            return byteArrayToHex(resultByteArray);
        } finally {
            sw.stop();
        }
    }

    private static String byteArrayToHex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
            if (n < b.length - 1) {
                hs = hs + "";
            }
        }
        return hs;
    }
}

Related

1. digest(final byte[] data)
2. digest(final InputStream inputStream, final MessageDigest digester)
3. digest(final java.security.MessageDigest messageDigest, final java.nio.ByteBuffer data)
4. digest(final String algorithm, final byte[] bytes)
5. digest(final String password)
6. digest(InputStream is, String digestAlgorithm)
7. digest(MessageDigest digest, InputStream data)
8. digest(MessageDigest method, File f)
9. digest(Serializable object)