AES.rar_AES_AES Cipher

001: /* 002: * 003: * 004: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved. 005: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER 006: * 007: * This program is free software; you can redistribute it and/or 008: * modify it under the terms of the GNU General Public License version 009: * 2 only, as published by the Free Software Foundation. 010: * 011: * This program is distributed in the hope that it will be useful, but 012: * WITHOUT ANY WARRANTY; without even the implied warranty of 013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014: * General Public License version 2 for more details (a copy is 015: * included at /legal/license.txt). 016: * 017: * You should have received a copy of the GNU General Public License 018: * version 2 along with this work; if not, write to the Free Software 019: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 020: * 02110-1301 USA 021: * 022: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa 023: * Clara, CA 95054 or visit www.sun.com if you need additional 024: * information or have any questions. 025: */ 026: 027: package com.sun.j2me.crypto; 028: 029: import java.security.Key; 030: 031: /** 032: * Wrapper for all AES cipher classes. 033: */ 034: public class AES extends Cipher { 035: Cipher cipher; 036: 037: /** 038: * Public by name constructor. 039: */ 040: public AES() { 041: } 042: 043: /** 044: * Called by the factory method to set the mode and padding parameters. 045: * Need because Class.newInstance does not take args. 046: * 047: * @param mode the mode parsed from the transformation parameter of 048: * getInstance 049: * @param padding the paddinge parsed from the transformation parameter of 050: * getInstance 051: * 052: * @exception NoSuchPaddingException if <code>transformation</code> 053: * contains a padding scheme that is not available. 054: */ 055: protected void setChainingModeAndPadding(String mode, String padding) 056: throws NoSuchPaddingException { 057: if (mode.equals("ECB") || mode.equals("")) { 058: cipher = new AES_ECB(); 059: } else if (mode.equals("CBC")) { 060: cipher = new AES_CBC(); 061: } else { 062: throw new IllegalArgumentException(); 063: } 064: 065: cipher.setChainingModeAndPadding(mode, padding); 066: } 067: 068: /** 069: * Initializes this cipher with a key and a set of algorithm 070: * parameters. 071: * 072: * <p>The cipher is initialized for one of the following operations: 073: * encryption or decryption depending 074: * on the value of <code>opmode</code>. 075: * 076: * <p>If this cipher requires any algorithm parameters and 077: * <code>params</code> is null, the underlying cipher implementation is 078: * supposed to generate the required parameters itself (using 079: * provider-specific default or random values) if it is being 080: * initialized for encryption, and raise an 081: * <code>InvalidAlgorithmParameterException</code> if it is being 082: * initialized for decryption. 083: * 084: * <p>Note that when a Cipher object is initialized, it loses all 085: * previously-acquired state. In other words, initializing a Cipher is 086: * equivalent to creating a new instance of that Cipher and initializing 087: * it. 088: * 089: * @param opmode the operation mode of this cipher (this is one of the 090: * following: 091: * <code>ENCRYPT_MODE</code> or <code>DECRYPT_MODE</code>) 092: * @param key the encryption key 093: * @param params the algorithm parameters 094: * 095: * @exception InvalidKeyException if the given key is inappropriate for 096: * initializing this cipher, or its keysize exceeds the maximum allowable 097: * keysize. 098: * @exception InvalidAlgorithmParameterException if the given algorithm 099: * parameters are inappropriate for this cipher, 100: * or this cipher is being initialized for decryption and requires 101: * algorithm parameters and <code>params</code> is null, or the given 102: * algorithm parameters imply a cryptographic strength that would exceed 103: * the legal limits. 104: */ 105: public void init(int opmode, Key key, CryptoParameter params) 106: throws InvalidKeyException, 107: InvalidAlgorithmParameterException { 108: cipher.init(opmode, key, params); 109: } 110: 111: /** 112: * Continues a multiple-part encryption or decryption operation 113: * (depending on how this cipher was initialized), processing another data 114: * part. 115: * 116: * <p>The first <code>inputLen</code> bytes in the <code>input</code> 117: * buffer, starting at <code>inputOffset</code> inclusive, are processed, 118: * and the result is stored in the <code>output</code> buffer, starting at 119: * <code>outputOffset</code> inclusive. 120: * 121: * <p>If the <code>output</code> buffer is too small to hold the result, 122: * a <code>ShortBufferException</code> is thrown. In this case, repeat this 123: * call with a larger output buffer. 124: * 125: * <p>If <code>inputLen</code> is zero, this method returns 126: * a length of zero. 127: * 128: * <p>Note: this method should be copy-safe, which means the 129: * <code>input</code> and <code>output</code> buffers can reference 130: * the same byte array and no unprocessed input data is overwritten 131: * when the result is copied into the output buffer. 132: * 133: * @param input the input buffer 134: * @param inputOffset the offset in <code>input</code> where the input 135: * starts 136: * @param inputLen the input length 137: * @param output the buffer for the result 138: * @param outputOffset the offset in <code>output</code> where the result 139: * is stored 140: * 141: * @return the number of bytes stored in <code>output</code> 142: * 143: * @exception IllegalStateException if this cipher is in a wrong state 144: * (e.g., has not been initialized) 145: * @exception ShortBufferException if the given output buffer is too small 146: * to hold the result 147: */ 148: public int update(byte[] input, int inputOffset, int inputLen, 149: byte[] output, int outputOffset) 150: throws IllegalStateException, ShortBufferException { 151: return cipher.update(input, inputOffset, inputLen, output, 152: outputOffset); 153: