| /* |
| * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.security.*; |
| import java.security.spec.*; |
| import javax.crypto.*; |
| import javax.crypto.spec.*; |
| |
| /** |
| * This class implements the DESede algorithm (DES-EDE, tripleDES) in |
| * its various modes (<code>ECB</code>, <code>CFB</code>, <code>OFB</code>, |
| * <code>CBC</code>, <code>PCBC</code>) and padding schemes |
| * (<code>PKCS5Padding</code>, <code>NoPadding</code>, |
| * <code>ISO10126Padding</code>). |
| * |
| * @author Gigi Ankeny |
| * |
| * |
| * @see DESCipher |
| */ |
| |
| public final class DESedeCipher extends CipherSpi { |
| |
| /* |
| * internal CipherCore object which does the real work. |
| */ |
| private CipherCore core = null; |
| |
| /** |
| * Creates an instance of DESede cipher with default ECB mode and |
| * PKCS5Padding. |
| */ |
| public DESedeCipher() { |
| core = new CipherCore(new DESedeCrypt(), DESConstants.DES_BLOCK_SIZE); |
| } |
| |
| /** |
| * Sets the mode of this cipher. |
| * |
| * @param mode the cipher mode |
| * |
| * @exception NoSuchAlgorithmException if the requested cipher mode does |
| * not exist |
| */ |
| protected void engineSetMode(String mode) |
| throws NoSuchAlgorithmException { |
| core.setMode(mode); |
| } |
| |
| /** |
| * Sets the padding mechanism of this cipher. |
| * |
| * @param paddingScheme the padding mechanism |
| * |
| * @exception NoSuchPaddingException if the requested padding mechanism |
| * does not exist |
| */ |
| protected void engineSetPadding(String paddingScheme) |
| throws NoSuchPaddingException { |
| core.setPadding(paddingScheme); |
| } |
| |
| /** |
| * Returns the block size (in bytes). |
| * |
| * @return the block size (in bytes), or 0 if the underlying algorithm is |
| * not a block cipher |
| */ |
| protected int engineGetBlockSize() { |
| return DESConstants.DES_BLOCK_SIZE; |
| } |
| |
| /** |
| * Returns the length in bytes that an output buffer would need to be in |
| * order to hold the result of the next <code>update</code> or |
| * <code>doFinal</code> operation, given the input length |
| * <code>inputLen</code> (in bytes). |
| * |
| * <p>This call takes into account any unprocessed (buffered) data from a |
| * previous <code>update</code> call, and padding. |
| * |
| * <p>The actual output length of the next <code>update</code> or |
| * <code>doFinal</code> call may be smaller than the length returned by |
| * this method. |
| * |
| * @param inputLen the input length (in bytes) |
| * |
| * @return the required output buffer size (in bytes) |
| */ |
| protected int engineGetOutputSize(int inputLen) { |
| return core.getOutputSize(inputLen); |
| } |
| |
| /** |
| * Returns the initialization vector (IV) in a new buffer. |
| * |
| * <p>This is useful in the case where a random IV has been created |
| * (see <a href = "#init">init</a>), |
| * or in the context of password-based encryption or |
| * decryption, where the IV is derived from a user-provided password. |
| * |
| * @return the initialization vector in a new buffer, or null if the |
| * underlying algorithm does not use an IV, or if the IV has not yet |
| * been set. |
| */ |
| protected byte[] engineGetIV() { |
| return core.getIV(); |
| } |
| |
| /** |
| * Initializes this cipher with a key and a source of randomness. |
| * |
| * <p>The cipher is initialized for one of the following four operations: |
| * encryption, decryption, key wrapping or key unwrapping, depending on |
| * the value of <code>opmode</code>. |
| * |
| * <p>If this cipher requires an initialization vector (IV), it will get |
| * it from <code>random</code>. |
| * This behaviour should only be used in encryption or key wrapping |
| * mode, however. |
| * When initializing a cipher that requires an IV for decryption or |
| * key unwrapping, the IV |
| * (same IV that was used for encryption or key wrapping) must be provided |
| * explicitly as a |
| * parameter, in order to get the correct result. |
| * |
| * <p>This method also cleans existing buffer and other related state |
| * information. |
| * |
| * @param opmode the operation mode of this cipher (this is one of |
| * the following: |
| * <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>, |
| * <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>) |
| * @param key the secret key |
| * @param random the source of randomness |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this cipher |
| */ |
| protected void engineInit(int opmode, Key key, SecureRandom random) |
| throws InvalidKeyException { |
| core.init(opmode, key, random); |
| } |
| |
| /** |
| * Initializes this cipher with a key, a set of |
| * algorithm parameters, and a source of randomness. |
| * |
| * <p>The cipher is initialized for one of the following four operations: |
| * encryption, decryption, key wrapping or key unwrapping, depending on |
| * the value of <code>opmode</code>. |
| * |
| * <p>If this cipher (including its underlying feedback or padding scheme) |
| * requires any random bytes, it will get them from <code>random</code>. |
| * |
| * @param opmode the operation mode of this cipher (this is one of |
| * the following: |
| * <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>, |
| * <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>) |
| * @param key the encryption key |
| * @param params the algorithm parameters |
| * @param random the source of randomness |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this cipher |
| * @exception InvalidAlgorithmParameterException if the given algorithm |
| * parameters are inappropriate for this cipher |
| */ |
| protected void engineInit(int opmode, Key key, |
| AlgorithmParameterSpec params, |
| SecureRandom random) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| core.init(opmode, key, params, random); |
| } |
| |
| protected void engineInit(int opmode, Key key, |
| AlgorithmParameters params, |
| SecureRandom random) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| core.init(opmode, key, params, random); |
| } |
| |
| /** |
| * Continues a multiple-part encryption or decryption operation |
| * (depending on how this cipher was initialized), processing another data |
| * part. |
| * |
| * <p>The first <code>inputLen</code> bytes in the <code>input</code> |
| * buffer, starting at <code>inputOffset</code>, are processed, and the |
| * result is stored in a new buffer. |
| * |
| * @param input the input buffer |
| * @param inputOffset the offset in <code>input</code> where the input |
| * starts |
| * @param inputLen the input length |
| * |
| * @return the new buffer with the result |
| * |
| * @exception IllegalStateException if this cipher is in a wrong state |
| * (e.g., has not been initialized) |
| */ |
| protected byte[] engineUpdate(byte[] input, int inputOffset, |
| int inputLen) { |
| return core.update(input, inputOffset, inputLen); |
| } |
| |
| /** |
| * Continues a multiple-part encryption or decryption operation |
| * (depending on how this cipher was initialized), processing another data |
| * part. |
| * |
| * <p>The first <code>inputLen</code> bytes in the <code>input</code> |
| * buffer, starting at <code>inputOffset</code>, are processed, and the |
| * result is stored in the <code>output</code> buffer, starting at |
| * <code>outputOffset</code>. |
| * |
| * @param input the input buffer |
| * @param inputOffset the offset in <code>input</code> where the input |
| * starts |
| * @param inputLen the input length |
| * @param output the buffer for the result |
| * @param outputOffset the offset in <code>output</code> where the result |
| * is stored |
| * |
| * @return the number of bytes stored in <code>output</code> |
| * |
| * @exception ShortBufferException if the given output buffer is too small |
| * to hold the result |
| */ |
| protected int engineUpdate(byte[] input, int inputOffset, int inputLen, |
| byte[] output, int outputOffset) |
| throws ShortBufferException { |
| return core.update(input, inputOffset, inputLen, output, |
| outputOffset); |
| } |
| |
| /** |
| * Encrypts or decrypts data in a single-part operation, |
| * or finishes a multiple-part operation. |
| * The data is encrypted or decrypted, depending on how this cipher was |
| * initialized. |
| * |
| * <p>The first <code>inputLen</code> bytes in the <code>input</code> |
| * buffer, starting at <code>inputOffset</code>, and any input bytes that |
| * may have been buffered during a previous <code>update</code> operation, |
| * are processed, with padding (if requested) being applied. |
| * The result is stored in a new buffer. |
| * |
| * <p>The cipher is reset to its initial state (uninitialized) after this |
| * call. |
| * |
| * @param input the input buffer |
| * @param inputOffset the offset in <code>input</code> where the input |
| * starts |
| * @param inputLen the input length |
| * |
| * @return the new buffer with the result |
| * |
| * @exception IllegalBlockSizeException if this cipher is a block cipher, |
| * no padding has been requested (only in encryption mode), and the total |
| * input length of the data processed by this cipher is not a multiple of |
| * block size |
| * @exception BadPaddingException if this cipher is in decryption mode, |
| * and (un)padding has been requested, but the decrypted data is not |
| * bounded by the appropriate padding bytes |
| */ |
| protected byte[] engineDoFinal(byte[] input, int inputOffset, |
| int inputLen) |
| throws IllegalBlockSizeException, BadPaddingException { |
| return core.doFinal(input, inputOffset, inputLen); |
| } |
| |
| /** |
| * Encrypts or decrypts data in a single-part operation, |
| * or finishes a multiple-part operation. |
| * The data is encrypted or decrypted, depending on how this cipher was |
| * initialized. |
| * |
| * <p>The first <code>inputLen</code> bytes in the <code>input</code> |
| * buffer, starting at <code>inputOffset</code>, and any input bytes that |
| * may have been buffered during a previous <code>update</code> operation, |
| * are processed, with padding (if requested) being applied. |
| * The result is stored in the <code>output</code> buffer, starting at |
| * <code>outputOffset</code>. |
| * |
| * <p>The cipher is reset to its initial state (uninitialized) after this |
| * call. |
| * |
| * @param input the input buffer |
| * @param inputOffset the offset in <code>input</code> where the input |
| * starts |
| * @param inputLen the input length |
| * @param output the buffer for the result |
| * @param outputOffset the offset in <code>output</code> where the result |
| * is stored |
| * |
| * @return the number of bytes stored in <code>output</code> |
| * |
| * @exception IllegalBlockSizeException if this cipher is a block cipher, |
| * no padding has been requested (only in encryption mode), and the total |
| * input length of the data processed by this cipher is not a multiple of |
| * block size |
| * @exception ShortBufferException if the given output buffer is too small |
| * to hold the result |
| * @exception BadPaddingException if this cipher is in decryption mode, |
| * and (un)padding has been requested, but the decrypted data is not |
| * bounded by the appropriate padding bytes |
| */ |
| protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, |
| byte[] output, int outputOffset) |
| throws IllegalBlockSizeException, ShortBufferException, |
| BadPaddingException { |
| return core.doFinal(input, inputOffset, inputLen, output, |
| outputOffset); |
| } |
| |
| /** |
| * Returns the parameters used with this cipher. |
| * |
| * <p>The returned parameters may be the same that were used to initialize |
| * this cipher, or may contain the default set of parameters or a set of |
| * randomly generated parameters used by the underlying cipher |
| * implementation (provided that the underlying cipher implementation |
| * uses a default set of parameters or creates new parameters if it needs |
| * parameters but was not initialized with any). |
| * |
| * @return the parameters used with this cipher, or null if this cipher |
| * does not use any parameters. |
| */ |
| protected AlgorithmParameters engineGetParameters() { |
| return core.getParameters("DESede"); |
| } |
| |
| /** |
| * Returns the key size of the given key object. |
| * |
| * @param key the key object. |
| * |
| * @return the "effective" key size of the given key object. |
| * |
| * @exception InvalidKeyException if <code>key</code> is invalid. |
| */ |
| protected int engineGetKeySize(Key key) throws InvalidKeyException { |
| byte[] encoded = key.getEncoded(); |
| if (encoded.length != 24) { |
| throw new InvalidKeyException("Invalid key length: " + |
| encoded.length + " bytes"); |
| } |
| // Return the effective key length |
| return 112; |
| } |
| |
| /** |
| * Wrap a key. |
| * |
| * @param key the key to be wrapped. |
| * |
| * @return the wrapped key. |
| * |
| * @exception IllegalBlockSizeException if this cipher is a block |
| * cipher, no padding has been requested, and the length of the |
| * encoding of the key to be wrapped is not a |
| * multiple of the block size. |
| * |
| * @exception InvalidKeyException if it is impossible or unsafe to |
| * wrap the key with this cipher (e.g., a hardware protected key is |
| * being passed to a software only cipher). |
| */ |
| protected byte[] engineWrap(Key key) |
| throws IllegalBlockSizeException, InvalidKeyException { |
| return core.wrap(key); |
| } |
| |
| /** |
| * Unwrap a previously wrapped key. |
| * |
| * @param wrappedKey the key to be unwrapped. |
| * |
| * @param wrappedKeyAlgorithm the algorithm the wrapped key is for. |
| * |
| * @param wrappedKeyType the type of the wrapped key. |
| * This is one of <code>Cipher.SECRET_KEY</code>, |
| * <code>Cipher.PRIVATE_KEY</code>, or <code>Cipher.PUBLIC_KEY</code>. |
| * |
| * @return the unwrapped key. |
| * |
| * @exception NoSuchAlgorithmException if no installed providers |
| * can create keys of type <code>wrappedKeyType</code> for the |
| * <code>wrappedKeyAlgorithm</code>. |
| * |
| * @exception InvalidKeyException if <code>wrappedKey</code> does not |
| * represent a wrapped key of type <code>wrappedKeyType</code> for |
| * the <code>wrappedKeyAlgorithm</code>. |
| */ |
| protected Key engineUnwrap(byte[] wrappedKey, |
| String wrappedKeyAlgorithm, |
| int wrappedKeyType) |
| throws InvalidKeyException, NoSuchAlgorithmException { |
| return core.unwrap(wrappedKey, wrappedKeyAlgorithm, |
| wrappedKeyType); |
| } |
| } |