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200 lines
7.2 KiB
Java
200 lines
7.2 KiB
Java
/*
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* Copyright (c) 2006, 2021, 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 sun.security.provider;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.nio.ByteOrder;
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/**
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* Optimized methods for converting between byte[] and int[]/long[], both for
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* big endian and little endian byte orders.
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*
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* NOTE that ArrayIndexOutOfBoundsException will be thrown if the bounds checks
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* failed.
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*
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* This class may also be helpful in improving the performance of the
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* crypto code in the SunJCE provider. However, for now it is only accessible by
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* the message digest implementation in the SUN provider.
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*
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* @since 1.6
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* @author Andreas Sterbenz
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*/
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final class ByteArrayAccess {
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private ByteArrayAccess() {
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// empty
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}
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static final class LE {
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static final VarHandle INT_ARRAY
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= MethodHandles.byteArrayViewVarHandle(int[].class,
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ByteOrder.LITTLE_ENDIAN).withInvokeExactBehavior();
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static final VarHandle LONG_ARRAY
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= MethodHandles.byteArrayViewVarHandle(long[].class,
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ByteOrder.LITTLE_ENDIAN).withInvokeExactBehavior();
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}
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static final class BE {
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static final VarHandle INT_ARRAY
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= MethodHandles.byteArrayViewVarHandle(int[].class,
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ByteOrder.BIG_ENDIAN).withInvokeExactBehavior();
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static final VarHandle LONG_ARRAY
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= MethodHandles.byteArrayViewVarHandle(long[].class,
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ByteOrder.BIG_ENDIAN).withInvokeExactBehavior();
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}
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/**
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* int[] to byte[] conversion, little endian byte order.
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*/
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static void i2bLittle(int[] in, int inOfs, byte[] out, int outOfs, int len) {
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len += outOfs;
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while (outOfs < len) {
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LE.INT_ARRAY.set(out, outOfs, in[inOfs++]);
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outOfs += 4;
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}
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}
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// Store one 32-bit value into out[outOfs..outOfs+3] in little endian order.
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static void i2bLittle4(int val, byte[] out, int outOfs) {
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LE.INT_ARRAY.set(out, outOfs, val);
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}
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/**
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* byte[] to int[] conversion, big endian byte order.
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*/
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static void b2iBig(byte[] in, int inOfs, int[] out, int outOfs, int len) {
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len += inOfs;
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while (inOfs < len) {
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out[outOfs++] = (int) BE.INT_ARRAY.get(in, inOfs);
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inOfs += 4;
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}
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}
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// Special optimization of b2iBig(in, inOfs, out, 0, 64)
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static void b2iBig64(byte[] in, int inOfs, int[] out) {
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out[ 0] = (int) BE.INT_ARRAY.get(in, inOfs );
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out[ 1] = (int) BE.INT_ARRAY.get(in, inOfs + 4);
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out[ 2] = (int) BE.INT_ARRAY.get(in, inOfs + 8);
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out[ 3] = (int) BE.INT_ARRAY.get(in, inOfs + 12);
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out[ 4] = (int) BE.INT_ARRAY.get(in, inOfs + 16);
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out[ 5] = (int) BE.INT_ARRAY.get(in, inOfs + 20);
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out[ 6] = (int) BE.INT_ARRAY.get(in, inOfs + 24);
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out[ 7] = (int) BE.INT_ARRAY.get(in, inOfs + 28);
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out[ 8] = (int) BE.INT_ARRAY.get(in, inOfs + 32);
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out[ 9] = (int) BE.INT_ARRAY.get(in, inOfs + 36);
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out[10] = (int) BE.INT_ARRAY.get(in, inOfs + 40);
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out[11] = (int) BE.INT_ARRAY.get(in, inOfs + 44);
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out[12] = (int) BE.INT_ARRAY.get(in, inOfs + 48);
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out[13] = (int) BE.INT_ARRAY.get(in, inOfs + 52);
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out[14] = (int) BE.INT_ARRAY.get(in, inOfs + 56);
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out[15] = (int) BE.INT_ARRAY.get(in, inOfs + 60);
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}
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/**
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* int[] to byte[] conversion, big endian byte order.
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*/
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static void i2bBig(int[] in, int inOfs, byte[] out, int outOfs, int len) {
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len += outOfs;
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while (outOfs < len) {
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BE.INT_ARRAY.set(out, outOfs, in[inOfs++]);
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outOfs += 4;
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}
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}
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// Store one 32-bit value into out[outOfs..outOfs+3] in big endian order.
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static void i2bBig4(int val, byte[] out, int outOfs) {
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BE.INT_ARRAY.set(out, outOfs, val);
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}
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/**
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* byte[] to long[] conversion, big endian byte order.
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*/
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static void b2lBig(byte[] in, int inOfs, long[] out, int outOfs, int len) {
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len += inOfs;
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while (inOfs < len) {
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out[outOfs++] = (long) BE.LONG_ARRAY.get(in, inOfs);
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inOfs += 8;
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}
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}
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// Special optimization of b2lBig(in, inOfs, out, 0, 128)
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static void b2lBig128(byte[] in, int inOfs, long[] out) {
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out[ 0] = (long) BE.LONG_ARRAY.get(in, inOfs );
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out[ 1] = (long) BE.LONG_ARRAY.get(in, inOfs + 8);
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out[ 2] = (long) BE.LONG_ARRAY.get(in, inOfs + 16);
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out[ 3] = (long) BE.LONG_ARRAY.get(in, inOfs + 24);
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out[ 4] = (long) BE.LONG_ARRAY.get(in, inOfs + 32);
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out[ 5] = (long) BE.LONG_ARRAY.get(in, inOfs + 40);
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out[ 6] = (long) BE.LONG_ARRAY.get(in, inOfs + 48);
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out[ 7] = (long) BE.LONG_ARRAY.get(in, inOfs + 56);
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out[ 8] = (long) BE.LONG_ARRAY.get(in, inOfs + 64);
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out[ 9] = (long) BE.LONG_ARRAY.get(in, inOfs + 72);
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out[10] = (long) BE.LONG_ARRAY.get(in, inOfs + 80);
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out[11] = (long) BE.LONG_ARRAY.get(in, inOfs + 88);
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out[12] = (long) BE.LONG_ARRAY.get(in, inOfs + 96);
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out[13] = (long) BE.LONG_ARRAY.get(in, inOfs + 104);
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out[14] = (long) BE.LONG_ARRAY.get(in, inOfs + 112);
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out[15] = (long) BE.LONG_ARRAY.get(in, inOfs + 120);
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}
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/**
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* long[] to byte[] conversion, big endian byte order.
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*/
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static void l2bBig(long[] in, int inOfs, byte[] out, int outOfs, int len) {
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len += outOfs;
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while (outOfs < len) {
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BE.LONG_ARRAY.set(out, outOfs, in[inOfs++]);
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outOfs += 8;
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}
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}
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/**
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* byte[] to long[] conversion, little endian byte order
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*/
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static void b2lLittle(byte[] in, int inOfs, long[] out, int outOfs, int len) {
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len += inOfs;
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while (inOfs < len) {
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out[outOfs++] = (long) LE.LONG_ARRAY.get(in, inOfs);
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inOfs += 8;
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}
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}
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/**
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* long[] to byte[] conversion, little endian byte order
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*/
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static void l2bLittle(long[] in, int inOfs, byte[] out, int outOfs, int len) {
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len += outOfs;
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while (outOfs < len) {
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LE.LONG_ARRAY.set(out, outOfs, in[inOfs++]);
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outOfs += 8;
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}
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}
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}
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