super();
Assert.notNull(store, "store");
Assert.notNull(alias, "alias");
PrivateKeyEntry privateKeyEntry = (PrivateKeyEntry) store.get(alias, StoreEntryType.PRIVATE_KEY);
if (privateKeyEntry == null) {
throw new TimeStampException("Private key not found for " + alias);
}
PrivateKey privateKey = privateKeyEntry.getValue();
Certificate[] chain = privateKeyEntry.getChain();
this.init(privateKey, chain);
}