--- /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