8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/com/sun/crypto/provider/OutputFeedback.java

@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 1997, 2017, 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.InvalidKeyException;
+import java.security.ProviderException;
+
+/**
+ * This class represents ciphers in output-feedback (OFB) mode.
+ *
+ * <p>This mode is implemented independently of a particular cipher.
+ * Ciphers to which this mode should apply (e.g., DES) must be
+ * <i>plugged-in</i> using the constructor.
+ *
+ * <p>NOTE: This class does not deal with buffering or padding.
+ *
+ * @author Gigi Ankeny
+ */
+final class OutputFeedback extends FeedbackCipher {
+
+    /*
+     * output buffer
+     */
+    private byte[] k = null;
+
+    /*
+     * register buffer
+     */
+    private byte[] register = null;
+
+    /*
+     * number of bytes for each stream unit, defaults to the blocksize
+     * of the embedded cipher
+     */
+    private int numBytes;
+
+    // variables for save/restore calls
+    private byte[] registerSave = null;
+
+    OutputFeedback(SymmetricCipher embeddedCipher, int numBytes) {
+        super(embeddedCipher);
+        if (numBytes > blockSize) {
+            numBytes = blockSize;
+        }
+        this.numBytes = numBytes;
+        k = new byte[blockSize];
+        register = new byte[blockSize];
+    }
+
+    /**
+     * Gets the name of this feedback mode.
+     *
+     * @return the string <code>OFB</code>
+     */
+    String getFeedback() {
+        return "OFB";
+    }
+
+    /**
+     * Initializes the cipher in the specified mode with the given key
+     * and iv.
+     *
+     * @param decrypting flag indicating encryption or decryption
+     * @param algorithm the algorithm name
+     * @param key the key
+     * @param iv the iv
+     *
+     * @exception InvalidKeyException if the given key is inappropriate for
+     * initializing this cipher
+     */
+    void init(boolean decrypting, String algorithm, byte[] key, byte[] iv)
+            throws InvalidKeyException {
+        if ((key == null) || (iv == null) || (iv.length != blockSize)) {
+            throw new InvalidKeyException("Internal error");
+        }
+        this.iv = iv;
+        reset();
+        // always encrypt mode for embedded cipher
+        embeddedCipher.init(false, algorithm, key);
+    }
+
+    /**
+     * Resets the iv to its original value.
+     * This is used when doFinal is called in the Cipher class, so that the
+     * cipher can be reused (with its original iv).
+     */
+    void reset() {
+        System.arraycopy(iv, 0, register, 0, blockSize);
+    }
+
+    /**
+     * Save the current content of this cipher.
+     */
+    void save() {
+        if (registerSave == null) {
+            registerSave = new byte[blockSize];
+        }
+        System.arraycopy(register, 0, registerSave, 0, blockSize);
+    }
+
+    /**
+     * Restores the content of this cipher to the previous saved one.
+     */
+    void restore() {
+        System.arraycopy(registerSave, 0, register, 0, blockSize);
+    }
+
+    /**
+     * Performs encryption operation.
+     *
+     * <p>The input plain text <code>plain</code>, starting at
+     * <code>plainOffset</code> and ending at
+     * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
+     * The result is stored in <code>cipher</code>, starting at
+     * <code>cipherOffset</code>.
+     *
+     * @param plain the buffer with the input data to be encrypted
+     * @param plainOffset the offset in <code>plain</code>
+     * @param plainLen the length of the input data
+     * @param cipher the buffer for the result
+     * @param cipherOffset the offset in <code>cipher</code>
+     * @exception ProviderException if <code>plainLen</code> is not
+     * a multiple of the <code>numBytes</code>
+     * @return the length of the encrypted data
+     */
+    int encrypt(byte[] plain, int plainOffset, int plainLen,
+                byte[] cipher, int cipherOffset) {
+
+        if ((plainLen % numBytes) != 0) {
+            throw new ProviderException("Internal error in input buffering");
+        }
+        int nShift = blockSize - numBytes;
+        int loopCount = plainLen / numBytes;
+
+        for (; loopCount > 0;
+             plainOffset += numBytes, cipherOffset += numBytes,
+             loopCount--) {
+            embeddedCipher.encryptBlock(register, 0, k, 0);
+            for (int i = 0; i < numBytes; i++) {
+                cipher[i + cipherOffset] =
+                    (byte)(k[i] ^ plain[i + plainOffset]);
+            }
+            if (nShift != 0) {
+                System.arraycopy(register, numBytes, register, 0, nShift);
+            }
+            System.arraycopy(k, 0, register, nShift, numBytes);
+        }
+        return plainLen;
+    }
+
+    /**
+     * Performs last encryption operation.
+     *
+     * <p>The input plain text <code>plain</code>, starting at
+     * <code>plainOffset</code> and ending at
+     * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
+     * The result is stored in <code>cipher</code>, starting at
+     * <code>cipherOffset</code>.
+     *
+     * @param plain the buffer with the input data to be encrypted
+     * @param plainOffset the offset in <code>plain</code>
+     * @param plainLen the length of the input data
+     * @param cipher the buffer for the result
+     * @param cipherOffset the offset in <code>cipher</code>
+     * @return the length of the encrypted data
+     */
+    int encryptFinal(byte[] plain, int plainOffset, int plainLen,
+                     byte[] cipher, int cipherOffset) {
+        int oddBytes = plainLen % numBytes;
+        int len = encrypt(plain, plainOffset, (plainLen - oddBytes),
+                          cipher, cipherOffset);
+        plainOffset += len;
+        cipherOffset += len;
+
+        if (oddBytes != 0) {
+            embeddedCipher.encryptBlock(register, 0, k, 0);
+            for (int i = 0; i < oddBytes; i++) {
+                cipher[i + cipherOffset] =
+                    (byte)(k[i] ^ plain[ i + plainOffset]);
+            }
+        }
+        return plainLen;
+    }
+
+    // OFB encrypt and decrypt are identical
+    int decrypt(byte[] cipher, int cipherOffset, int cipherLen,
+                byte[] plain, int plainOffset) {
+        return encrypt(cipher, cipherOffset, cipherLen, plain, plainOffset);
+    }
+
+    // OFB encrypt and decrypt are identical
+    int decryptFinal(byte[] cipher, int cipherOffset, int cipherLen,
+                     byte[] plain, int plainOffset) {
+        // OFB encrypt and decrypt are identical
+        return encryptFinal(cipher, cipherOffset, cipherLen, plain, plainOffset);
+    }
+}