# EapSessionConfig.EapAkaOption.Builder
Added in[API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Ctors](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#pubctors)\|[Methods](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#inhmethods)
# EapSessionConfig.EapAkaOption.Builder
*** ** * ** ***
[Kotlin](https://developer.android.com/reference/kotlin/android/net/eap/EapSessionConfig.EapAkaOption.Builder "View this page in Kotlin")\|Java
`
public
static
final
class
EapSessionConfig.EapAkaOption.Builder
`
`
extends `[Object](https://developer.android.com/reference/java/lang/Object)`
``
`
|---|-------------------------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.net.eap.EapSessionConfig.EapAkaOption.Builder |
*** ** * ** ***
This class can be used to incrementally construct an[EapAkaOption](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption).
## Summary
| ### Public constructors ||
|----------------------------------------------------------------------------------------------------------------------------|---|
| ` `[Builder](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#Builder())`() ` |
| ### Public methods ||
|-------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` `[EapSessionConfig.EapAkaOption](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption) | ` `[build](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#build())`() ` Constructs and returns an EapAkaOption with the configurations applied to this Builder. |
| ` `[EapSessionConfig.EapAkaOption.Builder](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder) | ` `[setReauthId](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder#setReauthId(byte[]))`(byte[] reauthId) ` Set fast re-authentication ID If keys are found matching the combination of reauthId and permanent ID, re-authentication will be attempted. |
| ### Inherited methods |
|-----------------------|---|
| From class` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` `[finalize](https://developer.android.com/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](https://developer.android.com/reference/java/lang/Class)`` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this`Object`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long,%20int))`(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](https://developer.android.com/reference/java/lang/Object#wait(long))`(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](https://developer.android.com/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*. | ||
## Public constructors
### Builder
Added in[API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Builder ()
```
## Public methods
### build
Added in[API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public EapSessionConfig.EapAkaOption build ()
```
Constructs and returns an EapAkaOption with the configurations applied to this Builder.
| Returns ||
|------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|
| [EapSessionConfig.EapAkaOption](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption) | the EapAkaOption constructed by this Builder. This value cannot be`null`.
|
### setReauthId
Added in[API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public EapSessionConfig.EapAkaOption.Builder setReauthId (byte[] reauthId)
```
Set fast re-authentication ID
If keys are found matching the combination of reauthId and permanent ID, re-authentication will be attempted.
Permanent ID MUST be set in setEapIdentity
Upon session establishment, new re-authentication IDs will be listed in the EapAkaInfo returned as part of IkeSessionCallback#onOpened().
Reauthentication is generally considered less secure, as it does not prove the existence of the full credentials, and should be used only when a strong correlation can be provided to the full authentication (eg shared keys from previous authentication runs)
| Parameters ||
|------------|------------------------------------------------------------------------------------|
| `reauthId` | `byte`: re-authentication ID encoded with UTF-8 This value cannot be`null`.
|
| Returns ||
|----------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------|
| [EapSessionConfig.EapAkaOption.Builder](https://developer.android.com/reference/android/net/eap/EapSessionConfig.EapAkaOption.Builder) | Builder this, to facilitate chaining. This value cannot be`null`.
|
**See also:**
- [RFC 4186, Extensible Authentication Protocol Method for 3rd Generation Authentication and Key Agreement (EAP-AKA)](https://datatracker.ietf.org/doc/html/rfc4187#section-5)