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Java Standard Edition (SE)

DESedeKeySpec


javax.crypto.spec

Class 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 and Description
      static int DES_EDE_KEY_LEN
      The constant which defines the length of a DESede key in bytes.
    • Constructor Summary

      Constructors 
      Constructor and 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.
    • 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


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