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1import javax.crypto.Mac;
2import javax.crypto.spec.SecretKeySpec;
3import java.security.InvalidKeyException;
4import java.security.NoSuchAlgorithmException;
5import java.util.Base64;
6
7public class HmacSha256 {
8
9    private static final String SECRET = "secret-here";
10
11    public static String generateHmacSha256(String value) {
12        try {
13            Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
14            SecretKeySpec secret_key = new SecretKeySpec(SECRET.getBytes(), "HmacSHA256");
15            sha256_HMAC.init(secret_key);
16            byte[] s53 = sha256_HMAC.doFinal(value.getBytes());
17            String hash = Base64.getEncoder().encodeToString(s53);
18            return hash;
19        } catch (IllegalStateException | InvalidKeyException | NoSuchAlgorithmException ex) {
20            throw new RuntimeException("HMAC", ex);
21        }
22
23    }
24
25}