javacard.security
Interface AESKey

All Superinterfaces:

Key, SecretKey

public interface AESKey

extends SecretKey

AESKey contains a 16/24/32 byte key for AES computations based on the Rijndael algorithm.

When the key data is set, the key is initialized and ready for use.

Since:

Java Card 2.2

See Also:

KeyBuilder, Signature, Cipher, KeyEncryption

Method Summary

byte	getKey(byte[] keyData, short kOff) Returns the Key data in plain text.
void	setKey(byte[] keyData, short kOff) Sets the Key data.

Methods inherited from interface javacard.security.Key

clearKey, getSize, getType, isInitialized

Method Detail

setKey

public void setKey(byte[] keyData,
                   short kOff)
            throws CryptoException,
                   NullPointerException,
                   ArrayIndexOutOfBoundsException

Sets the Key data. The plaintext length of input key data is 16/24/32 bytes. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input key data is copied into the internal representation.

Note:

• If the key object implements the javacardx.crypto.KeyEncryption interface and the Cipher object specified via setKeyCipher() is not null, keyData is decrypted using the Cipher object.

Parameters:

keyData - byte array containing key initialization data

kOff - offset within keyData to start

Throws:

CryptoException - with the following reason code:

• CryptoException.ILLEGAL_VALUE if input data decryption is required and fails.

ArrayIndexOutOfBoundsException - if kOff is negative or the keyData array is too short.

NullPointerException - if the keyData parameter is null.

getKey

public byte getKey(byte[] keyData,
                   short kOff)
            throws CryptoException

Returns the Key data in plain text. The length of output key data is 16/24/32 bytes. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).

Parameters:

keyData - byte array to return key data

kOff - offset within keyData to start

Returns:

the byte length of the key data returned

Throws:

CryptoException - with the following reason code:

• CryptoException.UNINITIALIZED_KEY if the key data has not been successfully initialized since the time the initialized state of the key was set to false.

See Also:

Key