Convert MD5 into String in java

Question

Can anyone know how to convert the MD5 to String. In my case I have saved the password in MD5 in database. I am trying to retreive the password and display it in string for the editing purpose.

This is what I have done for converting the string into encrypt format:

public static String encrypt(String source) {
   String md5 = null;
   try {
         MessageDigest mdEnc = MessageDigest.getInstance("MD5"); //Encryption algorithm
         mdEnc.update(source.getBytes(), 0, source.length());
         md5 = new BigInteger(1, mdEnc.digest()).toString(16); // Encrypted string
        } 
    catch (Exception ex) {
         return null;
    }
    return md5;
}

I don't know how convert the encrypt format into string for editing the password.

Answer 1

    String password = "123456";

    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(password.getBytes());

    byte byteData[] = md.digest();

    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < byteData.length; i++)
        sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));

    System.out.println("Digest(in hex format):: " + sb.toString());

Answer 2

MD5 is single side hash function. So you cannot decode it. This is why on many web sites you have options "retrieve password" by creating new one.

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