author | mbalao |
Tue, 12 Nov 2019 00:30:55 -0300 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2018, 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.InvalidKeyException; |
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import java.security.ProviderException; |
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import sun.security.util.ArrayUtil; |
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/** |
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* This class represents ciphers in cipher-feedback (CFB) mode. |
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* |
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* <p>This mode is implemented independently of a particular cipher. |
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* Ciphers to which this mode should apply (e.g., DES) must be |
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* <i>plugged-in</i> using the constructor. |
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* |
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* <p>NOTE: This class does not deal with buffering or padding. |
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* |
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* @author Gigi Ankeny |
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*/ |
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final class CipherFeedback extends FeedbackCipher { |
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/* |
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* encrypt/decrypt output buffer |
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*/ |
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private final byte[] k; |
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/* |
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* register value, initialized with iv |
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*/ |
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private final byte[] register; |
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/* |
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* number of bytes for each stream unit, defaults to the blocksize |
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* of the embedded cipher |
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*/ |
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private int numBytes; |
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// variables for save/restore calls |
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private byte[] registerSave = null; |
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CipherFeedback(SymmetricCipher embeddedCipher, int numBytes) { |
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super(embeddedCipher); |
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if (numBytes > blockSize) { |
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numBytes = blockSize; |
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} |
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this.numBytes = numBytes; |
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k = new byte[blockSize]; |
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register = new byte[blockSize]; |
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} |
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/** |
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* Gets the name of this feedback mode. |
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* |
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* @return the string <code>CFB</code> |
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*/ |
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String getFeedback() { |
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return "CFB"; |
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} |
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/** |
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* Initializes the cipher in the specified mode with the given key |
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* and iv. |
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* |
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* @param decrypting flag indicating encryption or decryption |
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* @param algorithm the algorithm name |
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* @param key the key |
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* @param iv the iv |
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* |
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* @exception InvalidKeyException if the given key is inappropriate for |
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* initializing this cipher |
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*/ |
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void init(boolean decrypting, String algorithm, byte[] key, byte[] iv) |
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throws InvalidKeyException { |
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if ((key == null) || (iv == null) || (iv.length != blockSize)) { |
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throw new InvalidKeyException("Internal error"); |
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} |
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this.iv = iv; |
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reset(); |
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// always encrypt mode for embedded cipher |
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embeddedCipher.init(false, algorithm, key); |
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} |
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/** |
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* Resets the iv to its original value. |
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* This is used when doFinal is called in the Cipher class, so that the |
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* cipher can be reused (with its original iv). |
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*/ |
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void reset() { |
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System.arraycopy(iv, 0, register, 0, blockSize); |
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} |
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/** |
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* Save the current content of this cipher. |
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*/ |
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void save() { |
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if (registerSave == null) { |
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registerSave = new byte[blockSize]; |
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} |
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System.arraycopy(register, 0, registerSave, 0, blockSize); |
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} |
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/** |
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* Restores the content of this cipher to the previous saved one. |
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*/ |
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void restore() { |
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System.arraycopy(registerSave, 0, register, 0, blockSize); |
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} |
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/** |
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* Performs encryption operation. |
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* |
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* <p>The input plain text <code>plain</code>, starting at |
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* <code>plainOffset</code> and ending at |
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* <code>(plainOffset + plainLen - 1)</code>, is encrypted. |
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* The result is stored in <code>cipher</code>, starting at |
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* <code>cipherOffset</code>. |
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* |
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* @param plain the buffer with the input data to be encrypted |
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* @param plainOffset the offset in <code>plain</code> |
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* @param plainLen the length of the input data |
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* @param cipher the buffer for the result |
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* @param cipherOffset the offset in <code>cipher</code> |
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* @exception ProviderException if <code>plainLen</code> is not |
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* a multiple of the <code>numBytes</code> |
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* @return the length of the encrypted data |
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*/ |
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int encrypt(byte[] plain, int plainOffset, int plainLen, |
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byte[] cipher, int cipherOffset) { |
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ArrayUtil.blockSizeCheck(plainLen, numBytes); |
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ArrayUtil.nullAndBoundsCheck(plain, plainOffset, plainLen); |
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ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, plainLen); |
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int nShift = blockSize - numBytes; |
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int loopCount = plainLen / numBytes; |
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for (; loopCount > 0 ; |
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plainOffset += numBytes, cipherOffset += numBytes, |
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loopCount--) { |
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embeddedCipher.encryptBlock(register, 0, k, 0); |
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if (nShift != 0) { |
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System.arraycopy(register, numBytes, register, 0, nShift); |
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} |
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for (int i = 0; i < numBytes; i++) { |
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register[nShift + i] = cipher[i + cipherOffset] = |
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(byte)(k[i] ^ plain[i + plainOffset]); |
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} |
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} |
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return plainLen; |
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} |
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/** |
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* Performs the last encryption operation. |
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* |
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* <p>The input plain text <code>plain</code>, starting at |
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* <code>plainOffset</code> and ending at |
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* <code>(plainOffset + plainLen - 1)</code>, is encrypted. |
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* The result is stored in <code>cipher</code>, starting at |
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* <code>cipherOffset</code>. |
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* |
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* @param plain the buffer with the input data to be encrypted |
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* @param plainOffset the offset in <code>plain</code> |
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* @param plainLen the length of the input data |
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* @param cipher the buffer for the result |
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* @param cipherOffset the offset in <code>cipher</code> |
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* @return the number of bytes placed into <code>cipher</code> |
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*/ |
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int encryptFinal(byte[] plain, int plainOffset, int plainLen, |
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byte[] cipher, int cipherOffset) { |
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|
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int oddBytes = plainLen % numBytes; |
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int len = encrypt(plain, plainOffset, (plainLen - oddBytes), |
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cipher, cipherOffset); |
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plainOffset += len; |
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cipherOffset += len; |
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if (oddBytes != 0) { |
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embeddedCipher.encryptBlock(register, 0, k, 0); |
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for (int i = 0; i < oddBytes; i++) { |
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cipher[i + cipherOffset] = |
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(byte)(k[i] ^ plain[i + plainOffset]); |
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} |
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} |
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return plainLen; |
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} |
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/** |
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* Performs decryption operation. |
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* |
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* <p>The input cipher text <code>cipher</code>, starting at |
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* <code>cipherOffset</code> and ending at |
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* <code>(cipherOffset + cipherLen - 1)</code>, is decrypted. |
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* The result is stored in <code>plain</code>, starting at |
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* <code>plainOffset</code>. |
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* |
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* @param cipher the buffer with the input data to be decrypted |
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* @param cipherOffset the offset in <code>cipherOffset</code> |
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* @param cipherLen the length of the input data |
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* @param plain the buffer for the result |
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* @param plainOffset the offset in <code>plain</code> |
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* @exception ProviderException if <code>cipherLen</code> is not |
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* a multiple of the <code>numBytes</code> |
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* @return the length of the decrypted data |
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*/ |
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int decrypt(byte[] cipher, int cipherOffset, int cipherLen, |
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byte[] plain, int plainOffset) { |
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ArrayUtil.blockSizeCheck(cipherLen, numBytes); |
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ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, cipherLen); |
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ArrayUtil.nullAndBoundsCheck(plain, plainOffset, cipherLen); |
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int nShift = blockSize - numBytes; |
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int loopCount = cipherLen / numBytes; |
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for (; loopCount > 0; |
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plainOffset += numBytes, cipherOffset += numBytes, |
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loopCount--) { |
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embeddedCipher.encryptBlock(register, 0, k, 0); |
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if (nShift != 0) { |
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System.arraycopy(register, numBytes, register, 0, nShift); |
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} |
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for (int i = 0; i < numBytes; i++) { |
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register[i + nShift] = cipher[i + cipherOffset]; |
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plain[i + plainOffset] |
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= (byte)(cipher[i + cipherOffset] ^ k[i]); |
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} |
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} |
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return cipherLen; |
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} |
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|
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/** |
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* Performs the last decryption operation. |
2 | 255 |
* |
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* <p>The input cipher text <code>cipher</code>, starting at |
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* <code>cipherOffset</code> and ending at |
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* <code>(cipherOffset + cipherLen - 1)</code>, is decrypted. |
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* The result is stored in <code>plain</code>, starting at |
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* <code>plainOffset</code>. |
2 | 261 |
* |
262 |
* @param cipher the buffer with the input data to be decrypted |
|
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* @param cipherOffset the offset in <code>cipherOffset</code> |
|
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* @param cipherLen the length of the input data |
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* @param plain the buffer for the result |
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* @param plainOffset the offset in <code>plain</code> |
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* @return the length of the decrypted data |
2 | 268 |
*/ |
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int decryptFinal(byte[] cipher, int cipherOffset, int cipherLen, |
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byte[] plain, int plainOffset) { |
2 | 271 |
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int oddBytes = cipherLen % numBytes; |
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int len = decrypt(cipher, cipherOffset, (cipherLen - oddBytes), |
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plain, plainOffset); |
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cipherOffset += len; |
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plainOffset += len; |
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if (oddBytes != 0) { |
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embeddedCipher.encryptBlock(register, 0, k, 0); |
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for (int i = 0; i < oddBytes; i++) { |
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plain[i + plainOffset] |
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= (byte)(cipher[i + cipherOffset] ^ k[i]); |
2 | 282 |
} |
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} |
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return cipherLen; |
2 | 285 |
} |
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} |