Added in API level 1

Summary: Protected Ctors | Methods | Inherited Methods

KeyStore.Builder

public static abstract class KeyStore.Builder
extends Object

java.lang.Object
↳	java.security.KeyStore.Builder

A description of a to-be-instantiated KeyStore object.

An instance of this class encapsulates the information needed to instantiate and initialize a KeyStore object. That process is triggered when the getKeyStore() method is called.

This makes it possible to decouple configuration from KeyStore object creation and e.g. delay a password prompt until it is needed.

See also:

Summary

Protected constructors
`Builder()` Construct a new Builder.

Public methods
`abstract KeyStore`	`getKeyStore()` Returns the KeyStore described by this object.
`abstract KeyStore.ProtectionParameter`	`getProtectionParameter(String alias)` Returns the ProtectionParameters that should be used to obtain the `Entry` with the given alias.
`static KeyStore.Builder`	`newInstance(String type, Provider provider, KeyStore.ProtectionParameter protection)` Returns a new Builder object.
`static KeyStore.Builder`	`newInstance(File file, KeyStore.ProtectionParameter protection)` Returns a new Builder object.
`static KeyStore.Builder`	`newInstance(String type, Provider provider, File file, KeyStore.ProtectionParameter protection)` Returns a new Builder object.
`static KeyStore.Builder`	`newInstance(KeyStore keyStore, KeyStore.ProtectionParameter protectionParameter)` Returns a new Builder that encapsulates the given KeyStore.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Protected constructors

Builder

Added in API level 1

protected Builder ()

Construct a new Builder.

Public methods

getKeyStore

Added in API level 1

public abstract KeyStore getKeyStore ()

Returns the KeyStore described by this object.

Returns
`KeyStore`	the `KeyStore` described by this object

Throws
`KeyStoreException`	if an error occurred during the operation, for example if the KeyStore could not be instantiated or loaded

getProtectionParameter

Added in API level 1

public abstract KeyStore.ProtectionParameter getProtectionParameter (String alias)

Returns the ProtectionParameters that should be used to obtain the Entry with the given alias. The getKeyStore method must be invoked before this method may be called.

Parameters
`alias`	`String`: the alias of the KeyStore entry

Returns
`KeyStore.ProtectionParameter`	the ProtectionParameters that should be used to obtain the `Entry` with the given alias.

Throws
`NullPointerException`	if alias is null
`KeyStoreException`	if an error occurred during the operation
`IllegalStateException`	if the getKeyStore method has not been invoked prior to calling this method

newInstance

Added in API level 1

public static KeyStore.Builder newInstance (String type, 
                Provider provider, 
                KeyStore.ProtectionParameter protection)

Returns a new Builder object.

Each call to the getKeyStore() method on the returned builder will return a new KeyStore object of type type. Its load() method is invoked using a LoadStoreParameter that encapsulates protection.

The KeyStore is instantiated from provider if non-null. Otherwise, all installed providers are searched.

Calls to getProtectionParameter() will return protection.

Note that the getKeyStore() method is executed within the AccessControlContext of the code invoking this method.

Parameters
`type`	`String`: the type of KeyStore to be constructed
`provider`	`Provider`: the provider from which the KeyStore is to be instantiated (or null)
`protection`	`KeyStore.ProtectionParameter`: the ProtectionParameter securing the Keystore

Returns
`KeyStore.Builder`	a new Builder object

Throws
`NullPointerException`	if type or protection is null

newInstance

Added in API level 33

public static KeyStore.Builder newInstance (File file, 
                KeyStore.ProtectionParameter protection)

Returns a new Builder object.

The first call to the getKeyStore() method on the returned builder will create a KeyStore using file to detect the keystore type and then call its load() method. It uses the same algorithm to determine the keystore type as described in KeyStore#getInstance(File, LoadStoreParameter). The inputStream argument is constructed from file. If protection is a PasswordProtection, the password is obtained by calling the getPassword method. Otherwise, if protection is a CallbackHandlerProtection, the password is obtained by invoking the CallbackHandler.

Subsequent calls to getKeyStore() return the same object as the initial call. If the initial call failed with a KeyStoreException, subsequent calls also throw a KeyStoreException.

Calls to getProtectionParameter() will return a PasswordProtection object encapsulating the password that was used to invoke the load method.

Note that the getKeyStore() method is executed within the AccessControlContext of the code invoking this method.

Parameters
`file`	`File`: the File that contains the KeyStore data
`protection`	`KeyStore.ProtectionParameter`: the ProtectionParameter securing the KeyStore data

Returns
`KeyStore.Builder`	a new Builder object

Throws
`NullPointerException`	if file or protection is null
`IllegalArgumentException`	if protection is not an instance of either PasswordProtection or CallbackHandlerProtection; or if file does not exist or does not refer to a normal file

newInstance

Added in API level 1

public static KeyStore.Builder newInstance (String type, 
                Provider provider, 
                File file, 
                KeyStore.ProtectionParameter protection)

Returns a new Builder object.

The first call to the getKeyStore() method on the returned builder will create a KeyStore of type type and call its load() method. The inputStream argument is constructed from file. If protection is a PasswordProtection, the password is obtained by calling the getPassword method. Otherwise, if protection is a CallbackHandlerProtection, the password is obtained by invoking the CallbackHandler.

Subsequent calls to getKeyStore() return the same object as the initial call. If the initial call failed with a KeyStoreException, subsequent calls also throw a KeyStoreException.

The KeyStore is instantiated from provider if non-null. Otherwise, all installed providers are searched.

Calls to getProtectionParameter() will return a PasswordProtection object encapsulating the password that was used to invoke the load method.

Note that the getKeyStore() method is executed within the AccessControlContext of the code invoking this method.

Parameters
`type`	`String`: the type of KeyStore to be constructed
`provider`	`Provider`: the provider from which the KeyStore is to be instantiated (or null)
`file`	`File`: the File that contains the KeyStore data
`protection`	`KeyStore.ProtectionParameter`: the ProtectionParameter securing the KeyStore data

Returns
`KeyStore.Builder`	a new Builder object

Throws
`NullPointerException`	if type, file or protection is null
`IllegalArgumentException`	if protection is not an instance of either PasswordProtection or CallbackHandlerProtection; or if file does not exist or does not refer to a normal file

newInstance

Added in API level 1

public static KeyStore.Builder newInstance (KeyStore keyStore, 
                KeyStore.ProtectionParameter protectionParameter)

Returns a new Builder that encapsulates the given KeyStore. The getKeyStore() method of the returned object will return keyStore, the getProtectionParameter() method will return protectionParameters.

This is useful if an existing KeyStore object needs to be used with Builder-based APIs.

Parameters
`keyStore`	`KeyStore`: the KeyStore to be encapsulated
`protectionParameter`	`KeyStore.ProtectionParameter`: the ProtectionParameter used to protect the KeyStore entries

Returns
`KeyStore.Builder`	a new Builder object

Throws
`NullPointerException`	if keyStore or protectionParameters is null
`IllegalArgumentException`	if the keyStore has not been initialized