# RSAPublicKeySpec

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Summary:[Ctors](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#pubctors)\|[Methods](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#inhmethods)  

# RSAPublicKeySpec

`
public


class
RSAPublicKeySpec
`  
`

extends `[Object](https://developer.android.com/reference/java/lang/Object)`


``


implements

`[KeySpec](https://developer.android.com/reference/java/security/spec/KeySpec)`


`

|---|-------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | java.security.spec.RSAPublicKeySpec |

<br />

*** ** * ** ***

This class specifies an RSA public key.  
**See also:**

- [Key](https://developer.android.com/reference/java/security/Key)
- [KeyFactory](https://developer.android.com/reference/java/security/KeyFactory)
- [KeySpec](https://developer.android.com/reference/java/security/spec/KeySpec)
- [X509EncodedKeySpec](https://developer.android.com/reference/java/security/spec/X509EncodedKeySpec)
- [RSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/RSAPrivateKeySpec)
- [RSAPrivateCrtKeySpec](https://developer.android.com/reference/java/security/spec/RSAPrivateCrtKeySpec)

## Summary

|                                                                                                                                                                                                                                                                                   ### Public constructors                                                                                                                                                                                                                                                                                    ||
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[RSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#RSAPublicKeySpec(java.math.BigInteger,%20java.math.BigInteger))`(`[BigInteger](https://developer.android.com/reference/java/math/BigInteger)` modulus, `[BigInteger](https://developer.android.com/reference/java/math/BigInteger)` publicExponent) ` Creates a new RSAPublicKeySpec.                                                                                                                                                                                                   |
| ` `[RSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#RSAPublicKeySpec(java.math.BigInteger,%20java.math.BigInteger,%20java.security.spec.AlgorithmParameterSpec))`(`[BigInteger](https://developer.android.com/reference/java/math/BigInteger)` modulus, `[BigInteger](https://developer.android.com/reference/java/math/BigInteger)` publicExponent, `[AlgorithmParameterSpec](https://developer.android.com/reference/java/security/spec/AlgorithmParameterSpec)` params) ` Creates a new RSAPublicKeySpec with additional key parameters. |

|                                                                                                                                            ### Public methods                                                                                                                                             ||
|----------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` `[BigInteger](https://developer.android.com/reference/java/math/BigInteger)                                  | ` `[getModulus](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#getModulus())`() ` Returns the modulus.                                                       |
| ` `[AlgorithmParameterSpec](https://developer.android.com/reference/java/security/spec/AlgorithmParameterSpec) | ` `[getParams](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#getParams())`() ` Returns the parameters associated with this key, may be null if not present. |
| ` `[BigInteger](https://developer.android.com/reference/java/math/BigInteger)                                  | ` `[getPublicExponent](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec#getPublicExponent())`() ` Returns the public exponent.                                 |

| ### 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

### RSAPublicKeySpec

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public RSAPublicKeySpec (BigInteger modulus, 
                BigInteger publicExponent)
```

Creates a new RSAPublicKeySpec.

<br />

|                         Parameters                         ||
|------------------|------------------------------------------|
| `modulus`        | `BigInteger`: the modulus <br />         |
| `publicExponent` | `BigInteger`: the public exponent <br /> |

### RSAPublicKeySpec

Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public RSAPublicKeySpec (BigInteger modulus, 
                BigInteger publicExponent, 
                AlgorithmParameterSpec params)
```

Creates a new RSAPublicKeySpec with additional key parameters.

<br />

|                                               Parameters                                                ||
|------------------|---------------------------------------------------------------------------------------|
| `modulus`        | `BigInteger`: the modulus <br />                                                      |
| `publicExponent` | `BigInteger`: the public exponent <br />                                              |
| `params`         | `AlgorithmParameterSpec`: the parameters associated with this key, may be null <br /> |

## Public methods

### getModulus

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public BigInteger getModulus ()
```

Returns the modulus.

<br />

|                                            Returns                                             ||
|----------------------------------------------------------------------------|--------------------|
| [BigInteger](https://developer.android.com/reference/java/math/BigInteger) | the modulus <br /> |

### getParams

Added in[API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public AlgorithmParameterSpec getParams ()
```

Returns the parameters associated with this key, may be null if not present.

<br />

|                                                                           Returns                                                                           ||
|-------------------------------------------------------------------------------------------------------------|------------------------------------------------|
| [AlgorithmParameterSpec](https://developer.android.com/reference/java/security/spec/AlgorithmParameterSpec) | the parameters associated with this key <br /> |

### getPublicExponent

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public BigInteger getPublicExponent ()
```

Returns the public exponent.

<br />

|                                                Returns                                                 ||
|----------------------------------------------------------------------------|----------------------------|
| [BigInteger](https://developer.android.com/reference/java/math/BigInteger) | the public exponent <br /> |