Class DESedeKeySpec

java.lang.Object
javax.crypto.spec.DESedeKeySpec
All Implemented Interfaces:
KeySpec
public class DESedeKeySpec extends Object implements KeySpec
This class specifies a DES-EDE ("triple-DES") key.
Since:
1.4

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    DES_EDE_KEY_LEN
    The constant which defines the length of a DESede key in bytes.

  • Constructor Summary

    Constructors
    Constructor
    Description
    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.

  • Method Summary

    Modifier and Type
    Method
    Description
    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.

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • 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:

  • Constructor Details

    • 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 Details

    • 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