Skip to content

Most visited

Recently visited

navigation
Added in API level 1

DESedeKeySpec

public class DESedeKeySpec
extends Object implements KeySpec

java.lang.Object
   ↳ javax.crypto.spec.DESedeKeySpec


This class specifies a DES-EDE ("triple-DES") key.

Summary

Constants

int DES_EDE_KEY_LEN

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

Public constructors

DESedeKeySpec(byte[] key)

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

DESedeKeySpec(byte[] key, int offset)

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

Public methods

byte[] getKey()

Returns the DES-EDE key.

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

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

Inherited methods

From class java.lang.Object

Constants

DES_EDE_KEY_LEN

Added in API level 1
int DES_EDE_KEY_LEN

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

Constant Value: 24 (0x00000018)

Public constructors

DESedeKeySpec

Added in API level 1
DESedeKeySpec (byte[] key)

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 byte: 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

Added in API level 1
DESedeKeySpec (byte[] key, 
                int offset)

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 byte: 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 int: 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

Public methods

getKey

Added in API level 1
byte[] getKey ()

Returns the DES-EDE key.

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

isParityAdjusted

Added in API level 1
boolean isParityAdjusted (byte[] key, 
                int offset)

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

Parameters
key byte: a byte array which holds the key value
offset int: the offset into the byte array
Returns
boolean 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
This site uses cookies to store your preferences for site-specific language and display options.

Hooray!

This class requires API level or higher

This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.