Returns the MD5 value of the specified text - Java Security

Java examples for Security:MD5

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Description

Returns the MD5 value of the specified text

Demo Code


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main{
    public static void main(String[] argv) throws Exception{
        String text = "java2s.com";
        System.out.println(md5(text));
    }//w  w  w  .  j  a v  a2s. c  o  m
    /**
     * Returns the MD5 value of the specified text
     * 
     * @param text
     *            The text
     * @return The MD5 value of the text
     */
    public static String md5(final String text) {
        try {
            final MessageDigest md = MessageDigest.getInstance("MD5");
            return toHexString(md.digest(text.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            throw new UnsupportedOperationException(e);
        }
    }
    /**
     * Returns the MD5 value of the specified file
     * 
     * @param file
     *            The file
     * @return The MD5 value of file content
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static String md5(final File file) throws FileNotFoundException,
            IOException {
        InputStream input = null;

        try {
            return md5(input = new FileInputStream(file));
        } finally {
            IOUtils.closeQuietly(input);
        }
    }
    /**
     * Returns the MD5 value of the input stream
     * 
     * @param is
     *            The input stream
     * @return The MD5 value of the input stream
     * @throws IOException
     */
    public static String md5(final InputStream is) throws IOException {
        final byte[] buf = new byte[4096];

        try {
            final MessageDigest md = MessageDigest.getInstance("MD5");

            for (int n = 0; (n = is.read(buf)) != -1;) {
                md.update(buf, 0, n);
            }

            return new BigInteger(1, md.digest()).toString(16);
        } catch (NoSuchAlgorithmException e) {
            throw new UnsupportedOperationException(e);
        }
    }
    /**
     * Returns the specified data as hex sequence
     * 
     * @param data
     *            The data
     * @return a hex string
     */
    public static String toHexString(final byte[] data) {
        final int n = data.length;
        final StringBuilder hex = new StringBuilder();

        for (int i = 0; i < n; i++) {
            final byte b = data[i];
            hex.append(String.format("%02x", b & 0xff));
        }

        return hex.toString();
    }
}

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