Java compact1, compact2, compact3 javax.crypto.spec Class DESedeKeySpec（JDK8）

Field Detail

• DES_EDE_KEY_LEN

  public static final int DES_EDE_KEY_LEN

  The constant which defines the length of a DESede key in bytes.

  See Also:

  Constant Field Values

Constructor Detail

• DESedeKeySpec

  public DESedeKeySpec(byte[] key)
                throws InvalidKeyException

  Creates a DESedeKeySpec object using the first 24 bytes in key as the key material for the DES-EDE key.

  The bytes that constitute the DES-EDE key are those between key[0] and key[23] inclusive

  Parameters:

  key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.

  Throws:

  NullPointerException - if key is null.

  InvalidKeyException - if the given key material is shorter than 24 bytes.

• DESedeKeySpec

  public DESedeKeySpec(byte[] key,
                       int offset)
                throws InvalidKeyException

  Creates a DESedeKeySpec object using the first 24 bytes in key, beginning at offset inclusive, as the key material for the DES-EDE key.

  The bytes that constitute the DES-EDE key are those between key[offset] and key[offset+23] inclusive.

  Parameters:

  key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.

  offset - the offset in key, where the DES-EDE key material starts.

  Throws:

  NullPointerException - if key is null.

  InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes

Method Detail

• getKey

  public byte[] getKey()

  Returns the DES-EDE key.

  Returns:

  the DES-EDE key. Returns a new array each time this method is called.

• isParityAdjusted

  public static boolean isParityAdjusted(byte[] key,
                                         int offset)
                                  throws InvalidKeyException

  Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

  Parameters:

  key - a byte array which holds the key value

  offset - the offset into the byte array

  Returns:

  true if the given DES-EDE key is parity-adjusted, false otherwise

  Throws:

  NullPointerException - if key is null.

  InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes