I am facing an issue while trying to fetch the secret key entry from a keystore, created to store the password for a service account.

My keytool command reads as below:

keytool -genseckey -alias securesvc -keyalg AES -keysize 256 -keystore myseckey.jceks -storetype JCEKS -storepass myseckey

Next, I am trying to extract the key for securesvc using KeyStore.SecretKeyEntry:

1  String keystorePath = "security/myseckey.jceks";
2  char[] keystorePass = "myseckey".trim().toCharArray();
3  KeyStore ks = KeyStore.getInstance(new File(keystorePath), keystorePass);
4  try (FileInputStream fis = new FileInputStream(keystorePath)) {
5   ks.load(fis, keystorePass);
6  }
7  KeyStore.ProtectionParameter pp = new KeyStore.PasswordProtection(keystorePass);
8  KeyStore.SecretKeyEntry ske = (SecretKeyEntry) ks.getEntry("securesvc", pp);
9  SecretKey sk = ske.getSecretKey();
10 String securedKey = new String(Base64.getDecoder().decode(sk.getEncoded()));

But, I keep getting the exception below:

Exception in thread "main" java.security.UnrecoverableKeyException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption.
    at java.base/com.sun.crypto.provider.KeyProtector.unseal(KeyProtector.java:399)
    at java.base/com.sun.crypto.provider.JceKeyStore.engineGetKey(JceKeyStore.java:146)
    at java.base/java.security.KeyStoreSpi.engineGetEntry(KeyStoreSpi.java:499)
    at java.base/java.security.KeyStore.getEntry(KeyStore.java:1548)
    at com.practice.TestClass.getSecretKey(TestClass.java:8)

Can anyone point out where I am possibly going wrong here, and suggest a solution? Thanks in advance.