String password = "PASSWORD";
    KeyStore keyStore = KeyStore.getInstance("FloppyStore");
    keyStore.load(null, null);
		
    Enumeration aliases = keyStore.aliases();
    while (aliases.hasMoreElements())
    {
      String alias = (String)aliases.nextElement();
      if (keyStore.isKeyEntry(alias))
      {
        Key key = keyStore.getKey(alias, password.toCharArray());
      }
    }

Exception in thread "main" java.security.UnrecoverableKeyException
        at ru.CryptoPro.JCP.Key.PrivateKeySpec.read(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.g.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at ru.CryptoPro.JCP.KeyStore.t.e(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.t.a(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.ContainerStore.engineGetKey(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.JCPKeyStore.engineGetKey(Unknown Source)
        at java.security.KeyStore.getKey(KeyStore.java:792)
        at isc.CheckPass.main(CheckPass.java:32)
Caused by: java.io.FileNotFoundException: C:\Temp\jcp\key\gkniejda.000\masks.key (Отказано в доступе)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:165)
        at ru.CryptoPro.JCP.KeyStore.HDImage.a.storeFile(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.ContainerEncoder.storeMasks(Unknown Source)
        at ru.CryptoPro.JCP.KeyStore.t.a(Unknown Source)
        at ru.CryptoPro.JCP.Key.PrivateKeySpec.a(Unknown Source)
        at ru.CryptoPro.JCP.Key.PrivateKeySpec.b(Unknown Source)
        ... 9 more