# XdhKeySpec
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Ctors](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#pubctors)\|[Methods](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#inhmethods)
# XdhKeySpec
*** ** * ** ***
[Kotlin](https://developer.android.com/reference/kotlin/android/crypto/hpke/XdhKeySpec "View this page in Kotlin")\|Java
`
public
final
class
XdhKeySpec
`
`
``
extends `[EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec)`
``
`
|---|---|--------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.security.spec.EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec) ||
| | ↳ | android.crypto.hpke.XdhKeySpec |
*** ** * ** ***
External Diffie\\u2013Hellman (XDH) key spec holding either a public or private key.
Subclasses`EncodedKeySpec`using the non-Standard "raw" format. The XdhKeyFactory class utilises this in order to create XDH keys from raw bytes and to return them as an XdhKeySpec allowing the raw key material to be extracted from an XDH key.
## Summary
| ### Public constructors ||
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[XdhKeySpec](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#XdhKeySpec(byte[]))`(byte[] encoded) ` Creates an instance of[XdhKeySpec](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec)by passing a public or private key in its raw format. |
| ### Public methods ||
|-----------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` boolean` | ` `[equals](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` o) ` Indicates whether some other object is "equal to" this one. |
| ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[getFormat](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#getFormat())`() ` Returns the name of the encoding format associated with this key specification. |
| ` byte[]` | ` `[getKey](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#getKey())`() ` Returns the public or private key in its raw format. |
| ` int` | ` `[hashCode](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec#hashCode())`() ` Returns a hash code value for the object. |
| ### Inherited methods |
|-----------------------|---|
| From class` `[java.security.spec.EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec)` ` |--------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[getAlgorithm](https://developer.android.com/reference/java/security/spec/EncodedKeySpec#getAlgorithm())`() ` Returns the name of the algorithm of the encoded key. | | ` byte[]` | ` `[getEncoded](https://developer.android.com/reference/java/security/spec/EncodedKeySpec#getEncoded())`() ` Returns the encoded key. | | ` abstract `[String](https://developer.android.com/reference/java/lang/String) | ` `[getFormat](https://developer.android.com/reference/java/security/spec/EncodedKeySpec#getFormat())`() ` Returns the name of the encoding format associated with this key specification. | ||
| 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
### XdhKeySpec
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public XdhKeySpec (byte[] encoded)
```
Creates an instance of[XdhKeySpec](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec)by passing a public or private key in its raw format.
| Parameters ||
|-----------|--------------------------------------------|
| `encoded` | `byte`: This value cannot be`null`.
|
## Public methods
### equals
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean equals (Object o)
```
Indicates whether some other object is "equal to" this one.
The`equals`method implements an equivalence relation on non-null object references:
- It is*reflexive* : for any non-null reference value`x`,`x.equals(x)`should return`true`.
- It is*symmetric* : for any non-null reference values`x`and`y`,`x.equals(y)`should return`true`if and only if`y.equals(x)`returns`true`.
- It is*transitive* : for any non-null reference values`x`,`y`, and`z`, if`x.equals(y)`returns`true`and`y.equals(z)`returns`true`, then`x.equals(z)`should return`true`.
- It is*consistent* : for any non-null reference values`x`and`y`, multiple invocations of`x.equals(y)`consistently return`true`or consistently return`false`, provided no information used in`equals`comparisons on the objects is modified.
- For any non-null reference value`x`,`x.equals(null)`should return`false`.
An equivalence relation partitions the elements it operates on into*equivalence classes*; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.
| Parameters ||
|-----|--------------------------------------------------------------|
| `o` | `Object`: the reference object with which to compare.
|
| Returns ||
|-----------|-------------------------------------------------------------------------------|
| `boolean` | `true`if this object is the same as the obj argument;`false`otherwise.
|
### getFormat
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String getFormat ()
```
Returns the name of the encoding format associated with this key specification.
If the opaque representation of a key (see[Key](https://developer.android.com/reference/java/security/Key)) can be transformed (see[KeyFactory](https://developer.android.com/reference/java/security/KeyFactory)) into this key specification (or a subclass of it),`getFormat`called on the opaque key returns the same value as the`getFormat`method of this key specification.
| Returns ||
|--------------------------------------------------------------------|------------------------------------|
| [String](https://developer.android.com/reference/java/lang/String) | This value cannot be`null`.
|
### getKey
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public byte[] getKey ()
```
Returns the public or private key in its raw format.
| Returns ||
|----------|-----------------------------------------------------------|
| `byte[]` | key in its raw format. This value cannot be`null`.
|
### hashCode
Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int hashCode ()
```
Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by[HashMap](https://developer.android.com/reference/java/util/HashMap).
The general contract of`hashCode`is:
- Whenever it is invoked on the same object more than once during an execution of a Java application, the`hashCode`method must consistently return the same integer, provided no information used in`equals`comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))method, then calling the`hashCode`method on each of the two objects must produce the same integer result.
- It is*not* required that if two objects are unequal according to the[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))method, then calling the`hashCode`method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
| Returns ||
|-------|-------------------------------------------|
| `int` | a hash code value for this object.
|