Java

Hash Binary Data (SHA256 and other hash algorithms)

Demonstrates how to hash binary bytes using SHA256, SHA384, SHA512, MD2, MD5, HAVAL, RIPEMD, etc. Java

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[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  Let's load a binary file to get the bytes..
    CkBinData jpgData = new CkBinData();
    success = jpgData.LoadFile("qa_data/jpg/starfish.jpg");
    if (success != true) {
        System.out.println("Failed to load file.");
        return;
        }

    CkByteData jpgBytes = new CkByteData();
    success = jpgData.GetBinary(jpgBytes);

    CkCrypt2 crypt = new CkCrypt2();

    //  Choose the hash algorithm.
    //  Can be  "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".
    crypt.put_HashAlgorithm("sha256");

    CkByteData hashBytes = new CkByteData();
    success = crypt.HashBytes(jpgBytes,hashBytes);

    //  Let's examine the hash as a hex string.
    CkStringBuilder sb = new CkStringBuilder();
    sb.AppendEncoded(hashBytes,"hex");
    System.out.println("SHA256 hash = " + sb.getAsString());

    //  We could alternatively hash the bytes and receive the hex result directly:
    crypt.put_EncodingMode("hex");
    String hashHexStr = crypt.hashBytesENC(jpgBytes);
    System.out.println("SHA256 hash = " + hashHexStr);
  }
}