(Java) Calculate MD5 Hash of File (or SHA1, SHA256, and other hash algorithms)

Demonstrates how to calculate a hash for a file's contents.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    // Set the name of the hash algorithm.
    // Other choices include "sha1", "sha256", "sha384", "sha512", "md2", "md5", and "haval". 
    crypt.put_HashAlgorithm("md5");

    // EncodingMode specifies the encoding of the hash output.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.put_EncodingMode("hex");

    // Files of any type may be hashed -- it doesn't matter
    // if the file is binary or text...
    String hashStr;
    hashStr = crypt.hashFileENC("/temp/something.dat");
    if (crypt.get_LastMethodSuccess() != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    System.out.println(hashStr);
  }
}