public class DESedeKeySpec extends Object implements KeySpec
This class specifies a DES-EDE ("triple-DES") key.
public static final int DES_EDE_KEY_LEN
The constant which defines the length of a DESede key in bytes.
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
key
- the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.NullPointerException
- if key
is null.InvalidKeyException
- if the given key material is shorter than 24 bytes.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.
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.NullPointerException
- if key
is null.InvalidKeyException
- if the given key material, starting at offset
inclusive, is shorter than 24 bytespublic byte[] getKey()
Returns the DES-EDE key.
public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
Checks if the given DES-EDE key, starting at offset
inclusive, is parity-adjusted.
key
- a byte array which holds the key valueoffset
- the offset into the byte arrayNullPointerException
- if key
is null.InvalidKeyException
- if the given key material, starting at offset
inclusive, is shorter than 24 bytes
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