Package com.amilesend.onedrive.crypto

Class KeyStoreHelper

java.lang.Object

com.amilesend.onedrive.crypto.KeyStoreHelper

public class KeyStoreHelper
extends Object

Helper that manages storage of symmetric keys to a key store file.

Constructor Summary

Constructors

Constructor	Description
KeyStoreHelper(@NonNull Path keyStorePath, @NonNull char[] keyStorePassword)	Creates a new KeyStoreHelper instance.

Method Summary

Modifier and Type	Method	Description
SecretKey	getSecretKey(String alias, @NonNull char[] keyPassword)	Gets the key with the given alias and associated keyPassword from the key store.
void	saveSecretKey(String alias, @NonNull SecretKey key, @NonNull char[] keyPassword)	Saves the given key to the key store.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

KeyStoreHelper

public KeyStoreHelper(@NonNull Path keyStorePath,
 @NonNull char[] keyStorePassword)

Creates a new KeyStoreHelper instance.

Parameters:

keyStorePath - The path to the key store used to store the symmetric key used for encryption.

keyStorePassword - The password to access the key store.

Method Details

saveSecretKey

public void saveSecretKey(String alias,
 @NonNull SecretKey key,
 @NonNull char[] keyPassword)
                   throws KeyStoreHelperException

Saves the given key to the key store. Notes:

• The key is referenced by the alias and is individually protected via the given keyPassword.
• If the key store file does not exist, this method attempts to create a new key store to the defined keyStorePath prior to saving the key.

Parameters:

alias - the alias to store the key as

key - the key itself

keyPassword - the password that is specific to the key

Throws:

KeyStoreHelperException - if an error occurred while saving the key to the key store

getSecretKey

public SecretKey getSecretKey(String alias,
 @NonNull char[] keyPassword)
                       throws KeyStoreHelperException

Gets the key with the given alias and associated keyPassword from the key store. Notes:

• If the key store file does not exist, then this method attempts to create a new key store to the defined keyStorePath. In this case, null will be returned as the given alias references no existing key.
• If the key does not exist for the given alias, then null will be returned.

Parameters:

alias - the alias for the key

keyPassword - the associated password that protects the key

Returns:

the key, or null

Throws:

KeyStoreHelperException - if an error occurred while retrieving the key