HMAC SHA1 for Amazon S3

Demonstrates the HMAC SHA1 computation required by the Amazon S3 web service.

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[])
  {
    //  This example uses sample data from:
    //  http://docs.amazonwebservices.com/AmazonS3/2006-03-01/RESTAuthentication.html
    String strToSign;
    strToSign = "GET" + "\n" + "\n" + "\n" + "Tue, 27 Mar 2007 19:36:42 +0000" + "\n" + "/johnsmith/photos/puppy.jpg";

    CkCrypt2 crypt = new CkCrypt2();

    boolean success;
    success = crypt.UnlockComponent("Anything for 30-day trial.");
    if (success != true) {
        //  Unlock Failed.
        System.out.println(crypt.lastErrorText());
        return;
    }

    //  We want SHA1 for the HMAC hash algorithm:
    crypt.put_HashAlgorithm("sha1");

    String AWSAccessKeyId;
    AWSAccessKeyId = "0PN5J17HBGZHT7JJ3X82";
    String AWSSecretAccessKey;
    AWSSecretAccessKey = "uV3F3YluFJax1cknvbcGwgjvx4QpvB+leU8dUj2o";

    //  Set the HMAC secret key:
    crypt.SetHmacKeyString(AWSSecretAccessKey);

    //  By setting the charset = "utf-8", the string will be converted
    //  to utf-8 (internal to the Chilkat component) prior to signing:
    crypt.put_Charset("utf-8");

    //  Indicate that Base64 output is desired:
    crypt.put_EncodingMode("base64");

    String signature;
    signature = crypt.hmacStringENC(strToSign);
    System.out.println(crypt.lastErrorText());

    //  Display the signature as part of the HTTP Authorization header:
    System.out.println("Authorization: AWS "
         + AWSAccessKeyId + ":" + signature);

    System.out.println("Expected:      AWS 0PN5J17HBGZHT7JJ3X82:xXjDGYUmKxnwqr5KXNPGldn5LbA=");
  }
}