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);
}

What code did you use for that conversion?

thejh
– thejh

2010-12-26 15:37:51 +00:00
Commented Dec 26, 2010 at 15:37 — thejh
– thejh, Commented Dec 26, 2010 at 15:37
SHA-1 with key .. is HMAC? what is the purpose of this?

Bozho
– Bozho

2010-12-26 15:39:18 +00:00
Commented Dec 26, 2010 at 15:39 — Bozho
– Bozho, Commented Dec 26, 2010 at 15:39
@ thejh i am updating the answer right a way.

Ahmad Kayyali
– Ahmad Kayyali

2010-12-26 15:50:47 +00:00
Commented Dec 26, 2010 at 15:50 — Ahmad Kayyali
– Ahmad Kayyali, Commented Dec 26, 2010 at 15:50

zeroed · Accepted Answer · 2014-03-14 09:28:45Z

6

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.

edited Mar 14, 2014 at 9:28

zeroed

5481 gold badge7 silver badges15 bronze badges

answered Dec 26, 2010 at 15:55

evilone

22.8k8 gold badges84 silver badges112 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Ahmad Kayyali Over a year ago

Thank you very much for the response, but Base64.encodeBase64 is imported from android.util.Base64 or org.kobjects.base64? thanks in advance.

Ahmad Kayyali Over a year ago

Just to let you know the API android.util.Base64 does not have the method you mentioned i used : android.util.Base64.encode(bytes, 0)

evilone Over a year ago

In my example this is imported from org.apache.commons.codec.binary and you can download it from commons.apache.org/codec/download_codec.cgi

Fran García · Accepted Answer · 2015-07-01 14:57:15Z

0

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)

answered Jul 1, 2015 at 14:57

community wiki

Fran García

Collectives™ on Stack Overflow

How to Hash String using SHA-1 with key?

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest