Android examples for java.security:Hash
get File MD5 Hash
import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; public class Main{ public static void getFileMD5(String file, IHashState cb) { getFileHash("MD5", file, cb); }/*w w w.j av a 2 s .c o m*/ private static void getFileHash(final String algo, final String file, final IHashState cb) { if (cb == null) { return; } final File f = new File(file); if (!f.exists() || !f.canRead()) { cb.onFinish(file, null); return; } HDBThreadUtils.runOnWorker(new Runnable() { @Override public void run() { MessageDigest md; try { md = MessageDigest.getInstance(algo); md.reset(); InputStream is = new FileInputStream(f); byte[] buffer = new byte[4 * 1024]; // optimal size is 4K long available = is.available(); long processed = 0; int read = 0; do { read = is.read(buffer); if (read > 0) { md.update(buffer, 0, read); processed += read; cb.onProgress(file, processed, available); } } while (read > 0); is.close(); byte[] b = md.digest(); cb.onFinish(file, binaryToHexString(b)); } catch (Exception e) { cb.onFinish(file, null); } } }); } public static String binaryToHexString(byte[] messageDigest) { // Create Hex String StringBuffer hexString = new StringBuffer(); for (int i = 0; i < messageDigest.length; i++) { int by = 0xFF & messageDigest[i]; if (by < 0x10) { hexString.append("0").append(Integer.toHexString(by)); } else if (by >= 0x10) { hexString.append(Integer.toHexString(by)); } } return hexString.toString(); } }