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Never mind,  I have come up with a solution: package com.yourpackage.signature; import java.io.IOException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Date; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import org.apache.geronimo.mail.util.Base64; //can be whichever flavor of encoder you'd like public class SignatureGenerator { public static final String ACCESS_ID = "member-XXXXXXX";     public static final String SECRET_KEY = "XXXXXXXXXXXXXXXXXXXXXXXXXXx"; //expireTime should be in seconds since Jan 1 1970 : new Date().getTime()/1000) + X     public static String generateSignature(String data, String key, String expireTime, String algorithm)             throws InvalidKeyException, NoSuchAlgorithmException, IOException { data += expireTime; byte[] hmacData = null; SecretKeySpec secretKey = new SecretKeySpec(key.getBytes("UTF-8"),                     algorithm);             Mac mac = Mac.getInstance(algorithm);             mac.init(secretKey);             hmacData = mac.doFinal(data.getBytes("UTF-8")); String encoded = new String(Base64.encode(hmacData)); return encoded;     } public static void main(String[] args) {         try { Long longTime = new Long(new Date().getTime()/1000) + 60; System.out.println(longTime); String data = ACCESS_ID + "\n"; System.out.println(generateSignature(data, SECRET_KEY, String.valueOf(longTime), "HMACSHA1"));         } catch (Exception e) {             e.printStackTrace();         } } }