How to Hash String using SHA-1 with key?

Question

The time I used to develop applications on iPhone I was converting String to SHA1 with two combination:

• Data
• Key

Now I am developing an Android application and I did not any example for how to calculate SHA1 With key.

I am greatly appreciative of any guidance or help.

---

[The code that I currently use]

 private void convertStringToSHA1() { String sTimeStamp = new SimpleDateFormat("MM/dd/yyyy HH:MM:SS").format(new java.util.Date()); String sStringToHash = String.format("%1$s\\n%2$s", "Username",sTimeStamp); MessageDigest cript = MessageDigest.getInstance("SHA-1"); cript.reset(); cript.update(sStringToHash.getBytes("utf-8")); sStringToHash = new BigInteger(1, cript.digest()).toString(16); } 

Answer 1

Try something like that:

private String sha1(String s, String keyString) throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeyException {

SecretKeySpec key = new SecretKeySpec((keyString).getBytes("UTF-8"), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(key);

byte[] bytes = mac.doFinal(s.getBytes("UTF-8"));

return new String( Base64.encodeBase64(bytes));

}

SecretKeySpec docs.

Answer 2

Another solution would be using apache commons codec library:

@Grapes(
    @Grab(group='commons-codec', module='commons-codec', version='1.10')
)

import org.apache.commons.codec.digest.HmacUtils

HmacUtils.hmacSha1Hex(key.bytes, message.bytes)