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283 lines
9.4 KiB
Java
283 lines
9.4 KiB
Java
/*
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* Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.crypto.provider;
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import java.security.*;
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import java.security.spec.AlgorithmParameterSpec;
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import java.util.Arrays;
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import javax.crypto.*;
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/**
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* Implementation of the ARCFOUR cipher, an algorithm apparently compatible
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* with RSA Security's RC4(tm) cipher. The description of this algorithm was
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* taken from Bruce Schneier's book Applied Cryptography, 2nd ed.,
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* section 17.1.
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*
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* We support keys from 40 to 1024 bits. ARCFOUR would allow for keys shorter
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* than 40 bits, but that is too insecure for us to permit.
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*
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* Note that we subclass CipherSpi directly and do not use the CipherCore
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* framework. That was designed to simplify implementation of block ciphers
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* and does not offer any advantages for stream ciphers such as ARCFOUR.
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*
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* @since 1.5
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* @author Andreas Sterbenz
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*/
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public sealed class ARCFOURCipher extends CipherSpi
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permits PKCS12PBECipherCore.PBEWithSHA1AndRC4 {
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// state array S, 256 entries. The entries are 8-bit, but we use an int[]
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// because int arithmetic is much faster than in Java than bytes.
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private final int[] S;
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// state indices i and j. Called is and js to avoid collision with
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// local variables. 'is' is set to -1 after a call to doFinal()
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private int is, js;
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// the bytes of the last key used (if any)
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// we need this to re-initialize after a call to doFinal()
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private byte[] lastKey;
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// called by the JCE framework
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public ARCFOURCipher() {
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S = new int[256];
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}
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// core key setup code. initializes S, is, and js
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// assumes key is non-null and between 40 and 1024 bit
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private void init(byte[] key) {
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// initialize S[i] to i
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for (int i = 0; i < 256; i++) {
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S[i] = i;
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}
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// we avoid expanding key to 256 bytes and instead keep a separate
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// counter ki = i mod key.length.
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for (int i = 0, j = 0, ki = 0; i < 256; i++) {
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int Si = S[i];
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j = (j + Si + key[ki]) & 0xff;
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S[i] = S[j];
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S[j] = Si;
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ki++;
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if (ki == key.length) {
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ki = 0;
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}
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}
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// set indices to 0
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is = 0;
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js = 0;
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}
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// core crypt code. OFB style, so works for both encryption and decryption
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private void crypt(byte[] in, int inOfs, int inLen, byte[] out,
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int outOfs) {
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if (is < 0) {
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// doFinal() was called, need to reset the cipher to initial state
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init(lastKey);
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}
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while (inLen-- > 0) {
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is = (is + 1) & 0xff;
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int Si = S[is];
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js = (js + Si) & 0xff;
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int Sj = S[js];
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S[is] = Sj;
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S[js] = Si;
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out[outOfs++] = (byte)(in[inOfs++] ^ S[(Si + Sj) & 0xff]);
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}
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}
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// Modes do not make sense with stream ciphers, but allow ECB
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// see JCE spec.
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protected void engineSetMode(String mode) throws NoSuchAlgorithmException {
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if (mode.equalsIgnoreCase("ECB") == false) {
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throw new NoSuchAlgorithmException("Unsupported mode " + mode);
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}
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}
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// Padding does not make sense with stream ciphers, but allow NoPadding
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// see JCE spec.
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protected void engineSetPadding(String padding)
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throws NoSuchPaddingException {
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if (padding.equalsIgnoreCase("NoPadding") == false) {
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throw new NoSuchPaddingException("Padding must be NoPadding");
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}
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}
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// Return 0 to indicate stream cipher
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// see JCE spec.
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protected int engineGetBlockSize() {
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return 0;
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}
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// output length is always the same as input length
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// see JCE spec
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protected int engineGetOutputSize(int inputLen) {
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return inputLen;
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}
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// no IV, return null
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// see JCE spec
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protected byte[] engineGetIV() {
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return null;
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}
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// no parameters
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// see JCE spec
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protected AlgorithmParameters engineGetParameters() {
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return null;
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}
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// see JCE spec
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protected void engineInit(int opmode, Key key, SecureRandom random)
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throws InvalidKeyException {
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init(opmode, key);
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}
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// see JCE spec
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protected void engineInit(int opmode, Key key,
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AlgorithmParameterSpec params, SecureRandom random)
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throws InvalidKeyException, InvalidAlgorithmParameterException {
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if (params != null) {
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throw new InvalidAlgorithmParameterException
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("Parameters not supported");
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}
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init(opmode, key);
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}
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// see JCE spec
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protected void engineInit(int opmode, Key key,
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AlgorithmParameters params, SecureRandom random)
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throws InvalidKeyException, InvalidAlgorithmParameterException {
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if (params != null) {
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throw new InvalidAlgorithmParameterException
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("Parameters not supported");
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}
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init(opmode, key);
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}
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// init method. Check key, then call init(byte[]).
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private void init(int opmode, Key key) throws InvalidKeyException {
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// Cipher.init() already checks opmode to be:
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// ENCRYPT_MODE/DECRYPT_MODE/WRAP_MODE/UNWRAP_MODE
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if (lastKey != null) {
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Arrays.fill(lastKey, (byte)0);
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}
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lastKey = getEncodedKey(key);
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init(lastKey);
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}
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// return the encoding of key if key is a valid ARCFOUR key.
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// otherwise, throw an InvalidKeyException
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private static byte[] getEncodedKey(Key key) throws InvalidKeyException {
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String keyAlg = key.getAlgorithm();
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if (!keyAlg.equals("RC4") && !keyAlg.equals("ARCFOUR")) {
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throw new InvalidKeyException("Not an ARCFOUR key: " + keyAlg);
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}
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if ("RAW".equals(key.getFormat()) == false) {
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throw new InvalidKeyException("Key encoding format must be RAW");
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}
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byte[] encodedKey = key.getEncoded();
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if ((encodedKey.length < 5) || (encodedKey.length > 128)) {
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Arrays.fill(encodedKey, (byte)0);
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throw new InvalidKeyException
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("Key length must be between 40 and 1024 bit");
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}
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return encodedKey;
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}
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// see JCE spec
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protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) {
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byte[] out = new byte[inLen];
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crypt(in, inOfs, inLen, out, 0);
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return out;
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}
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// see JCE spec
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protected int engineUpdate(byte[] in, int inOfs, int inLen,
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byte[] out, int outOfs) throws ShortBufferException {
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if (out.length - outOfs < inLen) {
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throw new ShortBufferException("Output buffer too small");
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}
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crypt(in, inOfs, inLen, out, outOfs);
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return inLen;
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}
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// see JCE spec
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protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen) {
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byte[] out = engineUpdate(in, inOfs, inLen);
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is = -1;
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return out;
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}
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// see JCE spec
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protected int engineDoFinal(byte[] in, int inOfs, int inLen,
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byte[] out, int outOfs) throws ShortBufferException {
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int outLen = engineUpdate(in, inOfs, inLen, out, outOfs);
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is = -1;
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return outLen;
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}
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// see JCE spec
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protected byte[] engineWrap(Key key) throws IllegalBlockSizeException,
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InvalidKeyException {
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byte[] encoded = key.getEncoded();
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if ((encoded == null) || (encoded.length == 0)) {
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throw new InvalidKeyException("Could not obtain encoded key");
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}
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try {
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return engineDoFinal(encoded, 0, encoded.length);
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} finally {
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Arrays.fill(encoded, (byte)0);
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}
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}
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// see JCE spec
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protected Key engineUnwrap(byte[] wrappedKey, String algorithm,
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int type) throws InvalidKeyException, NoSuchAlgorithmException {
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byte[] encoded = null;
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try {
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encoded = engineDoFinal(wrappedKey, 0, wrappedKey.length);
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return ConstructKeys.constructKey(encoded, algorithm, type);
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} finally {
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if (encoded != null) {
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Arrays.fill(encoded, (byte) 0);
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}
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}
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}
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// see JCE spec
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protected int engineGetKeySize(Key key) throws InvalidKeyException {
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byte[] encodedKey = getEncodedKey(key);
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Arrays.fill(encodedKey, (byte)0);
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return Math.multiplyExact(encodedKey.length, 8);
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}
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}
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