com.microej.crypto.internal.provider

Class NativeKeyGeneratorSpi

java.lang.Object

javax.crypto.KeyGeneratorSpi

com.microej.crypto.internal.provider.NativeKeyGeneratorSpi

Direct Known Subclasses:

NativeAESKeyGeneratorSpi

public class NativeKeyGeneratorSpi
extends KeyGeneratorSpi

Generic KeyGenerator SPI to expose the key generation algorithms provided by a native crypto engine.

Constructor Summary

Constructors

Constructor and Description
NativeKeyGeneratorSpi(int keyBits, int algorithmId, String algorithm)

Method Summary

Modifier and Type	Method and Description
protected SecretKey	engineGenerateKey() Generates a secret key.
protected void	engineInit(AlgorithmParameterSpec params, SecureRandom random) Initializes the key generator with the specified parameter set and a user-provided source of randomness.
protected void	engineInit(int keysize, SecureRandom random) Initializes this key generator for a certain keysize, using the given source of randomness.
protected void	engineInit(SecureRandom random) Initializes the key generator.
protected static int	nativeGetAlgorithmId(byte[] algorithm) Get the supported algorithm native ID.
protected static boolean	nativeIsKeySizeSupported(int algorithmId, int keyBits) Checks whether the provided key size is supported.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NativeKeyGeneratorSpi

public NativeKeyGeneratorSpi(int keyBits,
                             int algorithmId,
                             String algorithm)

Method Detail

engineGenerateKey

protected SecretKey engineGenerateKey()

Generates a secret key.

Specified by:

engineGenerateKey in class KeyGeneratorSpi

Returns:

the new secret key.

engineInit

protected void engineInit(AlgorithmParameterSpec params,
                          SecureRandom random)
                   throws InvalidAlgorithmParameterException

Initializes the key generator with the specified parameter set and a user-provided source of randomness.

Specified by:

engineInit in class KeyGeneratorSpi

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 void engineInit(int keysize,
                          SecureRandom random)
                   throws InvalidParameterException

Initializes this key generator for a certain keysize, using the given source of randomness.

Specified by:

engineInit in class KeyGeneratorSpi

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 keysize is wrong or not supported.

engineInit

protected void engineInit(SecureRandom random)

Initializes the key generator.

Specified by:

engineInit in class KeyGeneratorSpi

Parameters:

random - the source of randomness for this generator

nativeGetAlgorithmId

protected static int nativeGetAlgorithmId(byte[] algorithm)

Get the supported algorithm native ID.

Parameters:

algorithm - Null terminated string that describes the algorithm

Returns:

algorithm ID on success or -1 on error.

nativeIsKeySizeSupported

protected static boolean nativeIsKeySizeSupported(int algorithmId,
                                                  int keyBits)

Checks whether the provided key size is supported.

Parameters:

algorithmId - ID of the algorithm

keyBits - size of the key expressed in bits

Returns:

true if supported else false.