Package net.i2p.crypto

Class CryptixRijndael_Algorithm

java.lang.Object
net.i2p.crypto.CryptixRijndael_Algorithm
public final class CryptixRijndael_Algorithm
extends Object
Rijndael --pronounced Reindaal-- is a variable block-size (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit) symmetric cipher.

Rijndael was written by Vincent Rijmen and Joan Daemen.

Portions of this code are Copyright © 1997, 1998 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

Author:
Raif S. Naffah, Paulo S. L. M. Barreto License is apparently available from http://www.cryptix.org/docs/license.html

  • Constructor Summary

    Constructors 
    Constructor Description
    CryptixRijndael_Algorithm()  

  • Method Summary

    Modifier and Type Method Description
    static void blockDecrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey)
    Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
    static void blockDecrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey, int blockSize)
    Decrypt exactly one block of ciphertext.
    static void blockEncrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey)
    Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
    static void blockEncrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey, int blockSize)
    Encrypt exactly one block of plaintext.
    static int blockSize()  
    static int getRounds​(int keySize, int blockSize)
    Return The number of rounds for a given Rijndael's key and block sizes.
    static Object makeKey​(byte[] k)
    Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit).
    static Object makeKey​(byte[] k, int blockSize)
    Expand a user-supplied key material into a session key.
    static Object makeKey​(byte[] k, int blockSize, CryptixAESKeyCache.KeyCacheEntry keyData)
    Expand a user-supplied key material into a session key.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

  • Method Details

    • makeKey

      public static final Object makeKey​(byte[] k) throws InvalidKeyException
      Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit).
      Parameters:
      k - The 128/192/256-bit user-key to use.
      Returns:
      an array of two int[][] containing { Ke, Kd }
      Throws:
      InvalidKeyException - If the key is invalid.

    • blockEncrypt

      public static final void blockEncrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey)
      Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
      Parameters:
      in - The plaintext.
      result - The resulting ciphertext.
      inOffset - Index of in from which to start considering data.
      sessionKey - The session key to use for encryption. This is a CryptixAESKeyCache.KeyCacheEntry. We use the Ke field for encryption. The actual parameter type is opaque, changed in 0.9.31, and is subject to change again.

    • blockDecrypt

      public static final void blockDecrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey)
      Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
      Parameters:
      in - The ciphertext.
      result - The resulting ciphertext
      inOffset - Index of in from which to start considering data.
      sessionKey - The session key to use for decryption. This is a CryptixAESKeyCache.KeyCacheEntry. We use the Kd field, for decryption. The actual parameter type is opaque, changed in 0.9.31, and is subject to change again.

    • blockSize

      public static final int blockSize()
      Returns:
      The default length in bytes of the Algorithm input block.

    • makeKey

      public static final Object makeKey​(byte[] k, int blockSize) throws InvalidKeyException
      Expand a user-supplied key material into a session key.
      Parameters:
      k - The 128/192/256-bit user-key to use.
      blockSize - The block size in bytes of this Rijndael, must be 16, 24, or 32.
      Returns:
      a CryptixAESKeyCache.KeyCacheEntry containing { Ke, Kd }. The actual return type is opaque, changed in 0.9.31, and is subject to change again.
      Throws:
      InvalidKeyException - If the key is invalid.

    • makeKey

      public static final Object makeKey​(byte[] k, int blockSize, CryptixAESKeyCache.KeyCacheEntry keyData) throws InvalidKeyException
      Expand a user-supplied key material into a session key. Not for external use, not a public API.
      Parameters:
      k - The 128/192/256-bit user-key to use.
      blockSize - The block size in bytes of this Rijndael, must be 16, 24, or 32.
      keyData - a cached data structure to fill in, or null.
      Returns:
      a CryptixAESKeyCache.KeyCacheEntry containing { Ke, Kd }. If keyData is non-null, this is keyData. If keyData is null, this is newly allocated.
      Throws:
      InvalidKeyException - If the key is invalid.

    • blockEncrypt

      public static final void blockEncrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey, int blockSize)
      Encrypt exactly one block of plaintext.
      Parameters:
      in - The plaintext.
      result - The resulting ciphertext.
      inOffset - Index of in from which to start considering data.
      sessionKey - The session key to use for encryption. This is a CryptixAESKeyCache.KeyCacheEntry. We use the Ke field for encryption. The actual parameter type is opaque, changed in 0.9.31, and is subject to change again.
      blockSize - The block size in bytes of this Rijndael.

    • blockDecrypt

      public static final void blockDecrypt​(byte[] in, byte[] result, int inOffset, int outOffset, Object sessionKey, int blockSize)
      Decrypt exactly one block of ciphertext.
      Parameters:
      in - The ciphertext.
      result - The resulting ciphertext.
      inOffset - Index of in from which to start considering data.
      sessionKey - The session key to use for decryption. This is a CryptixAESKeyCache.KeyCacheEntry. We use the Kd field, for decryption. The actual parameter type is opaque, changed in 0.9.31, and is subject to change again.
      blockSize - The block size in bytes of this Rijndael.

    • getRounds

      public static final int getRounds​(int keySize, int blockSize)
      Return The number of rounds for a given Rijndael's key and block sizes.
      Parameters:
      keySize - The size of the user key material in bytes.
      blockSize - The desired block size in bytes.
      Returns:
      The number of rounds for a given Rijndael's key and block sizes.