Creates a DESKeySpec object using the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key.

The bytes that constitute the DES key are those between key[offset] and key[offset+7] inclusive.

Parameters:

key		the buffer with the DES key material. The first 8 bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.
offset		the offset in key, where the DES key material starts.

Exceptions:

NullPointerException		if the given key material is null
InvalidKeyException		if the given key material, starting at offset inclusive, is shorter than 8 bytes.