javax.crypto.AEADBadTagException: Tag mismatch!

at com.sun.crypto.provider.GaloisCounterMode.decryptFinal(GaloisCounterMode.java:578)

at com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1116)

at com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1053)

at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853)

at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)

at javax.crypto.Cipher.doFinal(Cipher.java:2164)

如题，按照官方的文档执行也是这样，所有参数都有了，包括APIv3秘钥，依然报错

调用的URL是：https://api.mch.weixin.qq.com/v3/certificates

解密代码：

private static String aesgcmDecrypt(String aad, String iv, String cipherText) throws Exception { 

final Cipher cipher = Cipher.getInstance(ALGORITHM, "SunJCE"); 

SecretKeySpec key = new SecretKeySpec(AES_APIV3_KEY.getBytes(), "AES"); 

GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, iv.getBytes()); 

cipher.init(Cipher.DECRYPT_MODE, key, spec); 

cipher.updateAAD(aad.getBytes()); 

return new String(cipher.doFinal(Base64.getDecoder().decode(cipherText))); 

}