MD5 Hash a String

Java example to Digest-MD5 hash an XML document.

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkCrypt2 crypt = new CkCrypt2();

    //  Any string argument automatically begins the 30-day trial.
    boolean success;
    success = crypt.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Crypt component unlock failed");
        return;
    }

    String xmlDoc;
    xmlDoc = "<test><a>123</a><b>456</b><c>789</c></test>";

    //  This example was created in response to a request to
    //  do this:
    //  XML-->byte[]-->MD5(byte[])-->Base64(string)

    //  The output will be Base64, so set the EncodingMode:
    crypt.put_EncodingMode("base64");

    //  It is desired to hash bytes.  Depending on the programming
    //  language, strings may be Unicode (2 bytes/char).  We don't
    //  want to hash Unicode.  By setting the Charset property,
    //  we're telling the encryption component to first convert
    //  a string to the multibyte charset indicated.
    crypt.put_Charset("windows-1252");

    //  Set the hash algorithm:
    //  Choices are: md5, sha1, sha256, sha384, sha512, md2, haval
    crypt.put_HashAlgorithm("md5");

    String hashStr;
    //  Hash the string:
    //  Internally, this converts the string to bytes, hashes the bytes,
    //  and converts the hash bytes to a Base64 encoded string:

    //  Note: Any method in Chilkat Crypt that ends with "ENC" returns the
    //  output bytes (i.e. hashed or encrypted) as an encoded string
    //  according to the EncodingMode property, which can be "base64",
    //  "hex", "url", "quoted-printable", or "html" (for HTML entities).
    hashStr = crypt.hashStringENC(xmlDoc);

    System.out.println(hashStr);
  }
}