com.microej.crypto.internal.cipher

Class NativeAESWrapCipherSpi

java.lang.Object

javax.crypto.CipherSpi

com.microej.crypto.internal.cipher.AbstractAESWrapCipherSpi

com.microej.crypto.internal.cipher.NativeAESWrapCipherSpi

public class NativeAESWrapCipherSpi
extends AbstractAESWrapCipherSpi

Constructor Summary

Constructors

Constructor and Description
NativeAESWrapCipherSpi(int nativeTransformationId)

Method Summary

Modifier and Type	Method and Description
protected void	engineInit(boolean decrypting, SecretKey key) Initializes the AES Key Wrap cipher with the given key.
static NativeAESWrapCipherSpi	getInstance(String transformation) Creates a cipher context for the given transformation.
static int	nativeGetTransformation(byte[] transformation) Gets for the given transformation the cipher id.
protected SecretKey	unwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) Unwrap a previously wrapped key.
protected byte[]	wrap(SecretKey key) Wrap a key.

Methods inherited from class com.microej.crypto.internal.cipher.AbstractAESWrapCipherSpi

addExact, engineDoFinal, engineDoFinal, engineGetBlockSize, engineGetIV, engineGetOutputSize, engineInit, engineInit, engineUnwrap, engineUpdate, engineUpdate, engineWrap

Methods inherited from class javax.crypto.CipherSpi

engineUpdateAAD

Methods inherited from class java.lang.Object

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

Constructor Detail

NativeAESWrapCipherSpi

public NativeAESWrapCipherSpi(int nativeTransformationId)

Method Detail

engineInit

protected void engineInit(boolean decrypting,
                          SecretKey key)
                   throws InvalidKeyException

Description copied from class: AbstractAESWrapCipherSpi

Initializes the AES Key Wrap cipher with the given key.

Specified by:

engineInit in class AbstractAESWrapCipherSpi

Parameters:

decrypting - flag indicating wrap or unwrap mode

key - the key (never null)

Throws:

InvalidKeyException - if the given key is inappropriate for initializing this cipher

getInstance

@Nullable
public static NativeAESWrapCipherSpi getInstance(String transformation)

Creates a cipher context for the given transformation.

Parameters:

transformation - the cipher transformation to be used

Returns:

the AES cipher SPI context, or null if the transformation is not supported.

nativeGetTransformation

public static int nativeGetTransformation(byte[] transformation)

Gets for the given transformation the cipher id.

Parameters:

transformation - Null terminated string that describes the transformation

Returns:

transformation ID on success or -1 on error.

unwrap

protected SecretKey unwrap(byte[] wrappedKey,
                           String wrappedKeyAlgorithm,
                           int wrappedKeyType)
                    throws InvalidKeyException

Description copied from class: AbstractAESWrapCipherSpi

Unwrap a previously wrapped key.

Specified by:

unwrap in class AbstractAESWrapCipherSpi

Parameters:

wrappedKey - the key to be unwrapped.

wrappedKeyAlgorithm - the algorithm the wrapped key is for.

wrappedKeyType - the type of the wrapped key. This is one of Cipher.SECRET_KEY, Cipher.PRIVATE_KEY, or Cipher.PUBLIC_KEY.

Returns:

the unwrapped key.

Throws:

InvalidKeyException - if wrappedKey does not represent a wrapped key of type wrappedKeyType for the wrappedKeyAlgorithm.

wrap

protected byte[] wrap(SecretKey key)
               throws InvalidKeyException,
                      IllegalBlockSizeException

Description copied from class: AbstractAESWrapCipherSpi

Wrap a key.

Specified by:

wrap in class AbstractAESWrapCipherSpi

Parameters:

key - the key to be wrapped.

Returns:

the wrapped key.

Throws:

InvalidKeyException - if it is impossible to wrap the key with this cipher.

IllegalBlockSizeException - the length of the encoding of the key to be wrapped is not a multiple of the block size.