OpenConcerto

Dépôt officiel du code source de l'ERP OpenConcerto
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svn://code.openconcerto.org/openconcerto

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Rev Author Line No. Line
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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
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 *
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 * The contents of this file are subject to the terms of the GNU General Public License Version 3
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 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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 * language governing permissions and limitations under the License.
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 *
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 * When distributing the software, include this License Header Notice in each file.
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 */
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 package org.openconcerto.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.DigestOutputStream;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class MessageDigestUtils {
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    private static final char[] HEX_CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', };
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    /**
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     * Turns array of bytes into string representing each byte as unsigned hex number.
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     *
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     * @param hash Array of bytes to convert to hex-string
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     * @return Generated hex string
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     */
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    public static String asHex(byte hash[]) {
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        return toString(hash, HEX_CHARS);
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    }
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    public static String toString(final byte[] hash, final char[] chars) {
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        char buf[] = new char[hash.length * 2];
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        for (int i = 0, x = 0; i < hash.length; i++) {
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            buf[x++] = chars[(hash[i] >>> 4) & 0xf];
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            buf[x++] = chars[hash[i] & 0xf];
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        }
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        return new String(buf);
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    }
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    public static byte[] fromHex(String hash) {
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        final byte[] buf = new byte[hash.length() / 2];
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        for (int i = 0; i < buf.length; i++) {
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            buf[i] = (byte) Integer.parseInt(hash.substring(2 * i, 2 * i + 2), 16);
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        }
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        return buf;
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    }
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    /**
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     * Split an int into 4 bytes.
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     *
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     * @param integer an int, eg -2^31, or 16.
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     * @return the 4 bytes of its two's complement, eg [0x80, 0x00, 0x00, 0x00] or [0x00, 0x00,
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     *         0x00, 0x10].
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     */
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    public static byte[] int2bytes(int integer) {
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        final byte[] byteStr = new byte[4];
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        byteStr[0] = (byte) (integer >>> 24);
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        byteStr[1] = (byte) ((integer >>> 16) & 0xff);
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        byteStr[2] = (byte) ((integer >>> 8) & 0xff);
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        byteStr[3] = (byte) (integer & 0xff);
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        return byteStr;
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    }
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    /**
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     * Cat 4 bytes to make an int.
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     *
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     * @param buf an array of at least 4 bytes, eg [0x80, 0x00, 0x00, 0x03].
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     * @return the resulting int, eg -2^31 + 3 or -2147483645.
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     */
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    public static int bytes2int(byte[] buf) {
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        // eg -128 == 10000000 promoted to int => 11...110000000
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        // so we need & 0xff to remove added ones (except for the 1st since they're all shifted
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        // away)
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        return (buf[0] << 24) | ((buf[1] & 0xff) << 16) | ((buf[2] & 0xff) << 8) | (buf[3] & 0xff);
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    }
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    public static String getHashString(MessageDigest md) {
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        return asHex(md.digest());
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    }
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    public static String getHashString(String algo, byte[] data) throws NoSuchAlgorithmException {
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        final MessageDigest md = MessageDigest.getInstance(algo);
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        return getHashString(md, data);
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    }
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    public static String getHashString(MessageDigest md, byte[] data) {
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        md.update(data);
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        return getHashString(md);
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    }
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    public static String getHashString(MessageDigest md, final InputStream ins) throws IOException {
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        return asHex(getHash(md, ins));
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    }
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    public static byte[] getHash(MessageDigest md, final InputStream ins) throws IOException {
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        return getHash(md, ins, StreamUtils.NULL_OS);
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    }
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    public static byte[] getHash(MessageDigest md, final InputStream ins, final OutputStream out) throws IOException {
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        try (final DigestOutputStream digestStream = new DigestOutputStream(out, md)) {
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            StreamUtils.copy(ins, digestStream);
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        }
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        return md.digest();
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    }
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    public static byte[] getHash(MessageDigest md, final File f) throws IOException {
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        try (final InputStream ins = new FileInputStream(f)) {
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            return getHash(md, ins);
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        }
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    }
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    public static String getMD5(File f) throws IOException {
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        return asHex(getHash(getMD5(), f));
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    }
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    public static MessageDigest getMD5() {
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        try {
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            return MessageDigest.getInstance("MD5");
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        } catch (NoSuchAlgorithmException e) {
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            throw new IllegalStateException("MD5 is part of the standard JRE", e);
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        }
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    }
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    public static MessageDigest getSHA256() {
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        try {
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            return MessageDigest.getInstance("SHA-256");
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        } catch (NoSuchAlgorithmException e) {
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            throw new IllegalStateException("SHA-256 is part of the standard JRE", e);
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        }
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    }
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    private MessageDigestUtils() {
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    }
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}