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Pure Java implementation for JSON Web Token (JWT)

There is a newer version: 1.1.0

package tech.simter.jwt.signer;

import tech.simter.jwt.SignException;
import tech.simter.jwt.Signer;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

/**
 * Use HMAC SHA256 method to sign data to base64.
 *
 * @author RJ
 * @since JDK1.8
 */
public final class HS256 implements Signer {
  private static final String HMAC_SHA_256 = "HmacSHA256";

  @Override
  public byte[] sign(byte[] data, byte[] key) {
    try {
      Mac mac = Mac.getInstance(HMAC_SHA_256);
      mac.init(new SecretKeySpec(key, HMAC_SHA_256));
      return Base64.getUrlEncoder().encode(mac.doFinal(data));
    } catch (InvalidKeyException | NoSuchAlgorithmException e) {
      throw new SignException(e.getMessage(), e);
    }
  }
}