How to generate HMAC-SHA1 Signature in android?

Question

This is my base String:

        String args =\"oauth_consumer_key=\"+enc(consumerkey) +
                   \"&oauth_nonce=\"+enc(generateNonce()) +
              


        

Answer 1

Messy, but I'm using this:

static String hash_hmac(String type, String value, String key)
    {
    try {
        javax.crypto.Mac mac = javax.crypto.Mac.getInstance(type);
        javax.crypto.spec.SecretKeySpec secret = new javax.crypto.spec.SecretKeySpec(key.getBytes(), type);
        mac.init(secret);
        byte[] digest = mac.doFinal(value.getBytes());
        StringBuilder sb = new StringBuilder(digest.length*2);
        String s;
        for (byte b : digest){
        s = Integer.toHexString(intval(b));
        if(s.length() == 1) sb.append('0');
        sb.append(s);
        }
        return sb.toString();
    } catch (Exception e) {
        android.util.Log.v("TAG","Exception ["+e.getMessage()+"]", e);
    }
        return "";
    }

You then invoke it like this:

hash_hmac("HmacSHA1", value, key);