javacard.security
Interface DESKey

All Superinterfaces:

Key, SecretKey

public interface DESKey

extends SecretKey

DESKey contains an 8/16/24 byte key for single/2 key triple DES/3 key triple DES operations.

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

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

Sets the Key data. The plaintext length of input key data is 8 bytes for DES, 16 bytes for 2 key triple DES and 24 bytes for 3 key triple DES. 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.

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 the input key data length is inconsistent with the implementation or if input data decryption is required and fails.

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.

getKey

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

Returns the Key data in plain text. The length of output key data is 8 bytes for DES, 16 bytes for 2 key triple DES and 24 bytes for 3 key triple DES. 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.