+++ /dev/null
-package org.argeo.util;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.ByteBuffer;
-import java.nio.channels.FileChannel;
-import java.nio.channels.FileChannel.MapMode;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
-/** Utilities around cryptographic digests */
-public class DigestUtils {
- public final static String MD5 = "MD5";
- public final static String SHA1 = "SHA1";
- public final static String SHA256 = "SHA-256";
- public final static String SHA512 = "SHA-512";
-
- private static Boolean debug = false;
- // TODO: make it configurable
- private final static Integer byteBufferCapacity = 100 * 1024;// 100 KB
-
- public static byte[] sha1(byte[] bytes) {
- try {
- MessageDigest digest = MessageDigest.getInstance(SHA1);
- digest.update(bytes);
- byte[] checksum = digest.digest();
- return checksum;
- } catch (NoSuchAlgorithmException e) {
- throw new IllegalArgumentException(e);
- }
- }
-
- public static String digest(String algorithm, byte[] bytes) {
- try {
- MessageDigest digest = MessageDigest.getInstance(algorithm);
- digest.update(bytes);
- byte[] checksum = digest.digest();
- String res = encodeHexString(checksum);
- return res;
- } catch (NoSuchAlgorithmException e) {
- throw new IllegalArgumentException("Cannot digest with algorithm " + algorithm, e);
- }
- }
-
- public static String digest(String algorithm, InputStream in) {
- try {
- MessageDigest digest = MessageDigest.getInstance(algorithm);
- // ReadableByteChannel channel = Channels.newChannel(in);
- // ByteBuffer bb = ByteBuffer.allocateDirect(byteBufferCapacity);
- // while (channel.read(bb) > 0)
- // digest.update(bb);
- byte[] buffer = new byte[byteBufferCapacity];
- int read = 0;
- while ((read = in.read(buffer)) > 0) {
- digest.update(buffer, 0, read);
- }
-
- byte[] checksum = digest.digest();
- String res = encodeHexString(checksum);
- return res;
- } catch (NoSuchAlgorithmException e) {
- throw new IllegalArgumentException("Cannot digest with algorithm " + algorithm, e);
- } catch (IOException e) {
- throw new RuntimeException(e);
- } finally {
- StreamUtils.closeQuietly(in);
- }
- }
-
- public static String digest(String algorithm, File file) {
- FileInputStream fis = null;
- FileChannel fc = null;
- try {
- fis = new FileInputStream(file);
- fc = fis.getChannel();
-
- // Get the file's size and then map it into memory
- int sz = (int) fc.size();
- ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);
- return digest(algorithm, bb);
- } catch (IOException e) {
- throw new IllegalArgumentException("Cannot digest " + file + " with algorithm " + algorithm, e);
- } finally {
- StreamUtils.closeQuietly(fis);
- if (fc.isOpen())
- try {
- fc.close();
- } catch (IOException e) {
- // silent
- }
- }
- }
-
- protected static String digest(String algorithm, ByteBuffer bb) {
- long begin = System.currentTimeMillis();
- try {
- MessageDigest digest = MessageDigest.getInstance(algorithm);
- digest.update(bb);
- byte[] checksum = digest.digest();
- String res = encodeHexString(checksum);
- long end = System.currentTimeMillis();
- if (debug)
- System.out.println((end - begin) + " ms / " + ((end - begin) / 1000) + " s");
- return res;
- } catch (NoSuchAlgorithmException e) {
- throw new IllegalArgumentException("Cannot digest with algorithm " + algorithm, e);
- }
- }
-
- public static String sha1hex(Path path) {
- return digest(SHA1, path, byteBufferCapacity);
- }
-
- public static String digest(String algorithm, Path path, long bufferSize) {
- byte[] digest = digestRaw(algorithm, path, bufferSize);
- return encodeHexString(digest);
- }
-
- public static byte[] digestRaw(String algorithm, Path file, long bufferSize) {
- long begin = System.currentTimeMillis();
- try {
- MessageDigest md = MessageDigest.getInstance(algorithm);
- FileChannel fc = FileChannel.open(file);
- long fileSize = Files.size(file);
- if (fileSize <= bufferSize) {
- ByteBuffer bb = fc.map(MapMode.READ_ONLY, 0, fileSize);
- md.update(bb);
- } else {
- long lastCycle = (fileSize / bufferSize) - 1;
- long position = 0;
- for (int i = 0; i <= lastCycle; i++) {
- ByteBuffer bb;
- if (i != lastCycle) {
- bb = fc.map(MapMode.READ_ONLY, position, bufferSize);
- position = position + bufferSize;
- } else {
- bb = fc.map(MapMode.READ_ONLY, position, fileSize - position);
- position = fileSize;
- }
- md.update(bb);
- }
- }
- long end = System.currentTimeMillis();
- if (debug)
- System.out.println((end - begin) + " ms / " + ((end - begin) / 1000) + " s");
- return md.digest();
- } catch (NoSuchAlgorithmException e) {
- throw new IllegalArgumentException("Cannot digest " + file + " with algorithm " + algorithm, e);
- } catch (IOException e) {
- throw new RuntimeException("Cannot digest " + file + " with algorithm " + algorithm, e);
- }
- }
-
- public static void main(String[] args) {
- File file;
- if (args.length > 0)
- file = new File(args[0]);
- else {
- System.err.println("Usage: <file> [<algorithm>]" + " (see http://java.sun.com/j2se/1.5.0/"
- + "docs/guide/security/CryptoSpec.html#AppA)");
- return;
- }
-
- if (args.length > 1) {
- String algorithm = args[1];
- System.out.println(digest(algorithm, file));
- } else {
- String algorithm = "MD5";
- System.out.println(algorithm + ": " + digest(algorithm, file));
- algorithm = "SHA";
- System.out.println(algorithm + ": " + digest(algorithm, file));
- System.out.println(algorithm + ": " + sha1hex(file.toPath()));
- algorithm = "SHA-256";
- System.out.println(algorithm + ": " + digest(algorithm, file));
- algorithm = "SHA-512";
- System.out.println(algorithm + ": " + digest(algorithm, file));
- }
- }
-
- final private static char[] hexArray = "0123456789abcdef".toCharArray();
-
- /**
- * From
- * http://stackoverflow.com/questions/9655181/how-to-convert-a-byte-array-to
- * -a-hex-string-in-java
- */
- public static String encodeHexString(byte[] bytes) {
- char[] hexChars = new char[bytes.length * 2];
- for (int j = 0; j < bytes.length; j++) {
- int v = bytes[j] & 0xFF;
- hexChars[j * 2] = hexArray[v >>> 4];
- hexChars[j * 2 + 1] = hexArray[v & 0x0F];
- }
- return new String(hexChars);
- }
-
-}
projects / lgpl / argeo-commons.git / blobdiff