cast5.java

linux下建立JAVA虚拟机的源码KAFFE

/* Cast5.java -- 
   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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USA

Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
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package gnu.javax.crypto.cipher;

import gnu.java.security.Registry;
import gnu.java.security.util.Util;

import java.security.InvalidKeyException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;

/**
 * <p>An implmenetation of the <code>CAST5</code> (a.k.a. CAST-128) algorithm,
 * as per <i>RFC-2144</i>, dated May 1997.</p>
 *
 * <p>In this RFC, <i>Carlisle Adams</i> (the CA in CAST, ST stands for
 * <i>Stafford Tavares</i>) describes CAST5 as:</p>
 *
 * <blockquote>
 *    "...a DES-like Substitution-Permutation Network (SPN) cryptosystem which
 *    appears to have good resistance to differential cryptanalysis, linear
 *    cryptanalysis, and related-key cryptanalysis. This cipher also possesses
 *    a number of other desirable cryptographic properties, including avalanche,
 *    Strict Avalanche Criterion (SAC), Bit Independence Criterion (BIC), no
 *    complementation property, and an absence of weak and semi-weak keys."
 * </blockquote>
 *
 * <p><code>CAST5</code> is a symmetric block cipher with a block-size of 8
 * bytes and a variable key-size of up to 128 bits. Its authors, and their
 * employer (Entrust Technologies, a Nortel majority-owned company), made it
 * available worldwide on a royalty-free basis for commercial and non-commercial
 * uses.</p>
 *
 * <p>The <code>CAST5</code> encryption algorithm has been designed to allow a
 * key size that can vary from <code>40</code> bits to <code>128</code> bits,
 * in 8-bit increments (that is, the allowable key sizes are <code>40, 48, 56,
 * 64, ..., 112, 120,</code> and <code>128</code> bits. For variable keysize
 * operation, the specification is as follows:</p>
 *
 * <ol>
 *   <li>For key sizes up to and including <code>80</code> bits (i.e.,
 *    <code>40, 48, 56, 64, 72,</code> and <code>80</code> bits), the algorithm
 *    is exactly as specified but uses <code>12</code> rounds instead of
 *    <code>16</code>;</li>
 *   <li>For key sizes greater than <code>80</code> bits, the algorithm uses
 *    the full <code>16</code> rounds;</li>
 *   <li>For key sizes less than <code>128</code> bits, the key is padded with
 *    zero bytes (in the rightmost, or least significant, positions) out to
 *    <code>128</code> bits (since the <code>CAST5</code> key schedule assumes
 *    an input key of <code>128</code> bits).</li>
 * </ol>
 *
 * <p>References:</p>
 *
 * <ol>
 *    <li><a href="http://www.ietf.org/rfc/rfc2144.txt">The CAST-128 Encryption
 *    Algorithm</a>.<br>
 *    <a href="mailto:[e-mail]">Carlisle Adams</a>.</li>
 * </ol>
 */
public class Cast5 extends BaseCipher
{

  // Constants and variables
  // -------------------------------------------------------------------------

  private static final int DEFAULT_BLOCK_SIZE = 8; // in bytes

  private static final int DEFAULT_KEY_SIZE = 5; // in bytes

  /**
   * KAT vector (from rfc-2144):
   * 40-bit  key         = 01 23 45 67 12
   *                     = 01 23 45 67 12 00 00 00 00 00 00 00 00 00 00 00
   *         plaintext   = 01 23 45 67 89 AB CD EF
   *         ciphertext  = 7A C8 16 D1 6E 9B 30 2E
   */
  private static final byte[] KAT_KEY = Util.toBytesFromString("0123456712");

  private static final byte[] KAT_PT = Util.toBytesFromString("0123456789ABCDEF");

  private static final byte[] KAT_CT = Util.toBytesFromString("7AC816D16E9B302E");

  /** caches the result of the correctness test, once executed. */
  private static Boolean valid;

  // CAST5 S-boxes
  private static final int[] S1 = { 0x30FB40D4, 0x9FA0FF0B, 0x6BECCD2F,
                                   0x3F258C7A, 0x1E213F2F, 0x9C004DD3,
                                   0x6003E540, 0xCF9FC949, 0xBFD4AF27,
                                   0x88BBBDB5, 0xE2034090, 0x98D09675,
                                   0x6E63A0E0, 0x15C361D2, 0xC2E7661D,
                                   0x22D4FF8E, 0x28683B6F, 0xC07FD059,
                                   0xFF2379C8, 0x775F50E2, 0x43C340D3,
                                   0xDF2F8656, 0x887CA41A, 0xA2D2BD2D,
                                   0xA1C9E0D6, 0x346C4819, 0x61B76D87,
                                   0x22540F2F, 0x2ABE32E1, 0xAA54166B,
                                   0x22568E3A, 0xA2D341D0, 0x66DB40C8,
                                   0xA784392F, 0x004DFF2F, 0x2DB9D2DE,
                                   0x97943FAC, 0x4A97C1D8, 0x527644B7,
                                   0xB5F437A7, 0xB82CBAEF, 0xD751D159,
                                   0x6FF7F0ED, 0x5A097A1F, 0x827B68D0,
                                   0x90ECF52E, 0x22B0C054, 0xBC8E5935,
                                   0x4B6D2F7F, 0x50BB64A2, 0xD2664910,
                                   0xBEE5812D, 0xB7332290, 0xE93B159F,
                                   0xB48EE411, 0x4BFF345D, 0xFD45C240,
                                   0xAD31973F, 0xC4F6D02E, 0x55FC8165,
                                   0xD5B1CAAD, 0xA1AC2DAE, 0xA2D4B76D,
                                   0xC19B0C50, 0x882240F2, 0x0C6E4F38,
                                   0xA4E4BFD7, 0x4F5BA272, 0x564C1D2F,
                                   0xC59C5319, 0xB949E354, 0xB04669FE,
                                   0xB1B6AB8A, 0xC71358DD, 0x6385C545,
                                   0x110F935D, 0x57538AD5, 0x6A390493,
                                   0xE63D37E0, 0x2A54F6B3, 0x3A787D5F,
                                   0x6276A0B5, 0x19A6FCDF, 0x7A42206A,
                                   0x29F9D4D5, 0xF61B1891, 0xBB72275E,
                                   0xAA508167, 0x38901091, 0xC6B505EB,
                                   0x84C7CB8C, 0x2AD75A0F, 0x874A1427,
                                   0xA2D1936B, 0x2AD286AF, 0xAA56D291,
                                   0xD7894360, 0x425C750D, 0x93B39E26,
                                   0x187184C9, 0x6C00B32D, 0x73E2BB14,
                                   0xA0BEBC3C, 0x54623779, 0x64459EAB,
                                   0x3F328B82, 0x7718CF82, 0x59A2CEA6,
                                   0x04EE002E, 0x89FE78E6, 0x3FAB0950,
                                   0x325FF6C2, 0x81383F05, 0x6963C5C8,
                                   0x76CB5AD6, 0xD49974C9, 0xCA180DCF,
                                   0x380782D5, 0xC7FA5CF6, 0x8AC31511,
                                   0x35E79E13, 0x47DA91D0, 0xF40F9086,
                                   0xA7E2419E, 0x31366241, 0x051EF495,
                                   0xAA573B04, 0x4A805D8D, 0x548300D0,
                                   0x00322A3C, 0xBF64CDDF, 0xBA57A68E,
                                   0x75C6372B, 0x50AFD341, 0xA7C13275,
                                   0x915A0BF5, 0x6B54BFAB, 0x2B0B1426,
                                   0xAB4CC9D7, 0x449CCD82, 0xF7FBF265,
                                   0xAB85C5F3, 0x1B55DB94, 0xAAD4E324,
                                   0xCFA4BD3F, 0x2DEAA3E2, 0x9E204D02,
                                   0xC8BD25AC, 0xEADF55B3, 0xD5BD9E98,
                                   0xE31231B2, 0x2AD5AD6C, 0x954329DE,
                                   0xADBE4528, 0xD8710F69, 0xAA51C90F,
                                   0xAA786BF6, 0x22513F1E, 0xAA51A79B,
                                   0x2AD344CC, 0x7B5A41F0, 0xD37CFBAD,
                                   0x1B069505, 0x41ECE491, 0xB4C332E6,
                                   0x032268D4, 0xC9600ACC, 0xCE387E6D,
                                   0xBF6BB16C, 0x6A70FB78, 0x0D03D9C9,
                                   0xD4DF39DE, 0xE01063DA, 0x4736F464,
                                   0x5AD328D8, 0xB347CC96, 0x75BB0FC3,
                                   0x98511BFB, 0x4FFBCC35, 0xB58BCF6A,
                                   0xE11F0ABC, 0xBFC5FE4A, 0xA70AEC10,
                                   0xAC39570A, 0x3F04442F, 0x6188B153,
                                   0xE0397A2E, 0x5727CB79, 0x9CEB418F,
                                   0x1CACD68D, 0x2AD37C96, 0x0175CB9D,
                                   0xC69DFF09, 0xC75B65F0, 0xD9DB40D8,
                                   0xEC0E7779, 0x4744EAD4, 0xB11C3274,
                                   0xDD24CB9E, 0x7E1C54BD, 0xF01144F9,
                                   0xD2240EB1, 0x9675B3FD, 0xA3AC3755,
                                   0xD47C27AF, 0x51C85F4D, 0x56907596,
                                   0xA5BB15E6, 0x580304F0, 0xCA042CF1,
                                   0x011A37EA, 0x8DBFAADB, 0x35BA3E4A,
                                   0x3526FFA0, 0xC37B4D09, 0xBC306ED9,
                                   0x98A52666, 0x5648F725, 0xFF5E569D,
                                   0x0CED63D0, 0x7C63B2CF, 0x700B45E1,
                                   0xD5EA50F1, 0x85A92872, 0xAF1FBDA7,
                                   0xD4234870, 0xA7870BF3, 0x2D3B4D79,
                                   0x42E04198, 0x0CD0EDE7, 0x26470DB8,
                                   0xF881814C, 0x474D6AD7, 0x7C0C5E5C,
                                   0xD1231959, 0x381B7298, 0xF5D2F4DB,
                                   0xAB838653, 0x6E2F1E23, 0x83719C9E,
                                   0xBD91E046, 0x9A56456E, 0xDC39200C,
                                   0x20C8C571, 0x962BDA1C, 0xE1E696FF,
                                   0xB141AB08, 0x7CCA89B9, 0x1A69E783,
                                   0x02CC4843, 0xA2F7C579, 0x429EF47D,
                                   0x427B169C, 0x5AC9F049, 0xDD8F0F00,
                                   0x5C8165BF };

  private static final int[] S2 = { 0x1F201094, 0xEF0BA75B, 0x69E3CF7E,
                                   0x393F4380, 0xFE61CF7A, 0xEEC5207A,
                                   0x55889C94, 0x72FC0651, 0xADA7EF79,
                                   0x4E1D7235, 0xD55A63CE, 0xDE0436BA,
                                   0x99C430EF, 0x5F0C0794, 0x18DCDB7D,
                                   0xA1D6EFF3, 0xA0B52F7B, 0x59E83605,
                                   0xEE15B094, 0xE9FFD909, 0xDC440086,
                                   0xEF944459, 0xBA83CCB3, 0xE0C3CDFB,
                                   0xD1DA4181, 0x3B092AB1, 0xF997F1C1,
                                   0xA5E6CF7B, 0x01420DDB, 0xE4E7EF5B,
                                   0x25A1FF41, 0xE180F806, 0x1FC41080,
                                   0x179BEE7A, 0xD37AC6A9, 0xFE5830A4,
                                   0x98DE8B7F, 0x77E83F4E, 0x79929269,
                                   0x24FA9F7B, 0xE113C85B, 0xACC40083,
                                   0xD7503525, 0xF7EA615F, 0x62143154,
                                   0x0D554B63, 0x5D681121, 0xC866C359,
                                   0x3D63CF73, 0xCEE234C0, 0xD4D87E87,
                                   0x5C672B21, 0x071F6181, 0x39F7627F,
                                   0x361E3084, 0xE4EB573B, 0x602F64A4,
                                   0xD63ACD9C, 0x1BBC4635, 0x9E81032D,
                                   0x2701F50C, 0x99847AB4, 0xA0E3DF79,
                                   0xBA6CF38C, 0x10843094, 0x2537A95E,
                                   0xF46F6FFE, 0xA1FF3B1F, 0x208CFB6A,
                                   0x8F458C74, 0xD9E0A227, 0x4EC73A34,
                                   0xFC884F69, 0x3E4DE8DF, 0xEF0E0088,
                                   0x3559648D, 0x8A45388C, 0x1D804366,
                                   0x721D9BFD, 0xA58684BB, 0xE8256333,
                                   0x844E8212, 0x128D8098, 0xFED33FB4,
                                   0xCE280AE1, 0x27E19BA5, 0xD5A6C252,
                                   0xE49754BD, 0xC5D655DD, 0xEB667064,
                                   0x77840B4D, 0xA1B6A801, 0x84DB26A9,