Java MD5 String md5AsHexString(String text, String charset)

Description

Computes an md5 hash and returns the result as a string in hexadecimal format.

License

Open Source License

Parameter

Parameter	Description
text	the hashed string

Return

the string hash

Declaration

public static String md5AsHexString(String text, String charset) 

Method Source Code

//package com.java2s;
/*//from  w  ww  .  j a  va  2 s.c o m
 * Copyright (C) 2006-2016 Talend Inc. - www.talend.com
 * 
 * This source code is available under agreement available at
 * %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt
 * 
 * You should have received a copy of the agreement along with this program; if not, write to Talend SA 9 rue Pages
 * 92150 Suresnes, France
 */

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**
     * Computes an md5 hash and returns the result as a string in hexadecimal format.
     * 
     * @param text the hashed string
     * @return the string hash
     * @exception NullPointerException if text is null
     */
    public static String md5AsHexString(String text, String charset) {
        return toHexString(md5(text, charset));
    }

    /**
     * Returns a string in the hexadecimal format.
     * 
     * @param bytes the converted bytes
     * @return the hexadecimal string representing the bytes data
     * @throws IllegalArgumentException if the byte array is null
     */
    public static String toHexString(byte[] bytes) {
        if (bytes == null) {
            throw new IllegalArgumentException("byte array must not be null"); //$NON-NLS-1$
        }
        StringBuilder hex = new StringBuilder(bytes.length * 2);
        for (byte aByte : bytes) {
            hex.append(Character.forDigit((aByte & 0XF0) >> 4, 16));
            hex.append(Character.forDigit((aByte & 0X0F), 16));
        }
        return hex.toString();
    }

    /**
     * Computes an md5 hash of a string.
     * 
     * @param text the hashed string
     * @return the string hash
     * @exception NullPointerException if text is null
     */
    public static byte[] md5(String text, String charset) {
        // arguments check
        if (text == null) {
            throw new NullPointerException("null text"); //$NON-NLS-1$
        }
        try {
            MessageDigest md = MessageDigest.getInstance("MD5"); //$NON-NLS-1$
            md.update(text.getBytes(charset));
            return md.digest();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("Cannot find MD5 algorithm"); //$NON-NLS-1$
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("No such encoding: " + charset); //$NON-NLS-1$
        }
    }
}

Related

1. md5(String value)
2. md5(String... args)
3. MD5(String... texts)
4. md52(String string)
5. MD5_HEX(String source)
6. md5Base64(String str)
7. md5ByHex(String src)
8. md5crypt(String s)
9. md5Digest(final InputStream data)