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java.lang.Object
- javax.crypto.KeyGeneratorSpi

```
public abstract class KeyGeneratorSpi
extends Object
```
This class defines the Service Provider Interface (SPI) for the KeyGenerator class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key generator for a particular algorithm.

Since:

1.4

See Also:
SecretKey

Constructor Summary

Constructors
Constructor and Description

KeyGeneratorSpi()

KeyGeneratorSpi (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
Modifier and Type	Method and Description
`protected abstract SecretKey`	`engineGenerateKey()` Generates a secret key.
`protected abstract void`	`engineInit(AlgorithmParameterSpec params, SecureRandom random)` Initializes the key generator with the specified parameter set and a user-provided source of randomness.
`protected abstract void`	`engineInit(int keysize, SecureRandom random)` Initializes this key generator for a certain keysize, using the given source of randomness.
`protected abstract void`	`engineInit(SecureRandom random)` Initializes the key generator.

KeyGeneratorSpi (Java Platform SE 7 ) Home of API Java Contents Haut

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - KeyGeneratorSpi
```
public KeyGeneratorSpi()
```
- Method Detail
  - engineInit
```
protected abstract void engineInit(SecureRandom random)
```
    Initializes the key generator.
    
    Parameters:
    random - the source of randomness for this generator
  - engineInit
```
protected abstract void engineInit(AlgorithmParameterSpec params,
              SecureRandom random)
                            throws InvalidAlgorithmParameterException
```
    Initializes the key generator with the specified parameter set and a user-provided source of randomness.
    
    Parameters:
    params - the key generation parameters
    random - the source of randomness for this key generator
    
    Throws:
    
    InvalidAlgorithmParameterException - if params is inappropriate for this key generator
  - engineInit
```
protected abstract void engineInit(int keysize,
              SecureRandom random)
```
    Initializes this key generator for a certain keysize, using the given source of randomness.
    
    Parameters:
    keysize - the keysize. This is an algorithm-specific metric, specified in number of bits.
    random - the source of randomness for this key generator
    
    Throws:
    
    InvalidParameterException - if the keysize is wrong or not supported.
  - engineGenerateKey
```
protected abstract SecretKey engineGenerateKey()
```
    Generates a secret key.
    
    Returns:
    the new key

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Steph

Class KeyGeneratorSpi

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

KeyGeneratorSpi

Method Detail

engineInit

engineInit

engineInit

engineGenerateKey

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