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In this tutorial, we will learn to create a hashing application. User can enter some text into the edit textbox,

then click the button. The application will show the hash values generated from different hash functions,

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including MD5, SHA1, SHA256, SHA384 and SHA512. The application can also compare the equality of two

messages by using hash values generated by SHA-256.

Oct 29, 2016 How to get Release Key Hash for android app Facebook October 29, 2016 android, facebook, featured, key-hash To authenticate the exchange of information between your app and the Facebook, you need to generate a release key hash and add this to. Finding your Keystore's Signature.; 3 minutes to read; In this article. The MD5 or SHA1 signature of a Xamarin.Android app depends on the.keystore file that was used to sign the APK. Typically, a debug build will use a different.keystore file than a release build. For Debug / Non-Custom Signed Builds.

This lab will illustrate all the major hash function have been used in real world recently. The function has been

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implemented are MD5, SHA-1, SHA-256, SHA-384, SHA-512. Second part of this lab is to compare the SHA-256

hash value for two input messages to determine whether these two messages are same or not.

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ü Android Studio

ü Java JDK, JRE

ü Android SDK

Create a new android project

Project Name: hashing
Package Name: android.hashing

Go to Hashing->…->res->layout folder

Create main.xml, hash.xml and compare.xml in the layout folder. Copy and paste code from relative file in the attachment section.

Go to Hashing->res

Put all the images into drawable-hdpi folder (hash.jpghashing.jpg).

Go to Hashing->src->android.hashing->HashingActivity.java

Copy and paste the following code in “ HashingActivity.java”

package android.hashing;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import android.app.Activity;

import android.content.Context;

import android.view.View;

import android.view.inputmethod.InputMethodManager;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageButton;

import android.widget.TableLayout;

import android.widget.TextView;

public class HashingActivity extends ActionBarActivity {

ImageButton hashing, compare, filechk, hash_out, compare_out, back1, back2;

TextView t1, t2, t3, hash_text, compare_result, md5_result, sha1_result,

sha256_result, sha384_result, sha512_result;

Button md5_btn, sha1_btn, sha256_btn, sha384_btn, sha512_btn;

EditText inputText, compareText1, compareText2;

TableLayout table;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

hashing = (ImageButton) findViewById(R.id.hash_btn);

compare = (ImageButton) findViewById(R.id.compare_btn);

}

public void hash_click(View view) {

setContentView(R.layout.hash);

t1 = (TextView) findViewById(R.id.tv1);

inputText = (EditText) findViewById(R.id.inputText);

hash_text = (TextView) findViewById(R.id.tv2);

md5_result = (TextView) findViewById(R.id.md5_result);

sha1_result = (TextView) findViewById(R.id.sha1_result);

sha256_result = (TextView) findViewById(R.id.sha256_result);

sha384_result = (TextView) findViewById(R.id.sha384_result);

sha512_result = (TextView) findViewById(R.id.sha512_result);

hash_out = (ImageButton) findViewById(R.id.hashresult);

back1 = (ImageButton) findViewById(R.id.back1);

table = (TableLayout) findViewById(R.id.TableLayout);

table.setVisibility(TableLayout.INVISIBLE);

}

public void hashresult_click(View view) throws NoSuchAlgorithmException,

UnsupportedEncodingException {

byte[] input, output1, output2, output3, output4, output5;

// create hash code

input = inputText.getText().toString().getBytes();

Log.i('VINH INPUT TEXT', inputText.getText().toString());

// MD5

MessageDigest md5 = MessageDigest.getInstance('MD5');

md5.reset();

md5.update(input);

output1 = md5.digest();

// create hex output

StringBuffer hexString1 = new StringBuffer();

for (int i = 0; i < output1.length; i++)

hexString1.append(Integer.toHexString(0xFF & output1[i]));

md5_result.setText(hexString1.toString());

Log.i('VINH MD5 OUTPUT ', hexString1.toString());

// SHA-1

MessageDigest sha1 = MessageDigest.getInstance('SHA-1');

sha1.reset();

sha1.update(input);

output2 = sha1.digest();

// create hex output

StringBuffer hexString2 = new StringBuffer();

for (int i = 0; i < output2.length; i++)

hexString2.append(Integer.toHexString(0xFF & output2[i]));

sha1_result.setText(hexString2.toString());

Log.i('VINH SHA1 OUTPUT ', hexString2.toString());

// SHA-256

MessageDigest sha256 = MessageDigest.getInstance('SHA-256');

sha256.reset();

sha256.update(input);

output3 = sha256.digest();

// create hex output

StringBuffer hexString3 = new StringBuffer();

for (int i = 0; i < output3.length; i++)

hexString3.append(Integer.toHexString(0xFF & output3[i]));

sha256_result.setText(hexString3.toString());

Log.i('VINH SHA256 OUTPUT ', hexString3.toString());

// SHA-384

MessageDigest sha384 = MessageDigest.getInstance('SHA-384');

sha384.reset();

sha384.update(input);

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output4 = sha384.digest();

// create hex output

StringBuffer hexString4 = new StringBuffer();

for (int i = 0; i < output4.length; i++)

hexString4.append(Integer.toHexString(0xFF & output4[i]));

sha384_result.setText(hexString4.toString());

Log.i('VINH SHA384 OUTPUT ', hexString4.toString());

// SHA-512

MessageDigest sha512 = MessageDigest.getInstance('SHA-512');

sha512.reset();

sha512.update(input);

output5 = sha512.digest();

// create hex output

StringBuffer hexString5 = new StringBuffer();

for (int i = 0; i < output5.length; i++)

hexString5.append(Integer.toHexString(0xFF & output5[i]));

sha512_result.setText(hexString5.toString());

Log.i('VINH SHA512 OUTPUT ', hexString5.toString());

table.setVisibility(TableLayout.VISIBLE);

}

// compare function

public void compare_click(View view)

{

setContentView(R.layout.compare);

t2 = (TextView) findViewById(R.id.compare_tv1);

t3 = (TextView) findViewById(R.id.compare_tv2);

compareText1 = (EditText) findViewById(R.id.compare_et1);

compareText2 = (EditText) findViewById(R.id.compare_et2);

compare_result = (TextView) findViewById(R.id.compare_result);

compare_out = (ImageButton) findViewById(R.id.compare);

back2 = (ImageButton) findViewById(R.id.back2);

}

public void compareresult_click(View view) throws NoSuchAlgorithmException,

UnsupportedEncodingException

{

byte[] input1, input2, output1, output2;

input1 = compareText1.getText().toString().getBytes();

input2 = compareText2.getText().toString().getBytes();

MessageDigest md1 = MessageDigest.getInstance('SHA-256');

md1.reset();

md1.update(input1);

output1 = md1.digest();

StringBuffer hexString1 = new StringBuffer();

for (int i = 0; i < output1.length; i++)

hexString1.append(Integer.toHexString(0xFF & output1[i]));

MessageDigest md2 = MessageDigest.getInstance('SHA-256');

md2.reset();

md2.update(input2);

output2 = md2.digest();

StringBuffer hexString2 = new StringBuffer();

for (int i = 0; i < output1.length; i++)

hexString2.append(Integer.toHexString(0xFF & output2[i]));

boolean bln = hexString1.toString().equals(hexString2.toString());

if (bln)

compare_result.setText('These two messages are same!' +

'nn The SHA-256 code for Message 1 is: n'

+ hexString1.toString() +

'nn The SHA-256 code for Message 2 is: n'

+ hexString2.toString());

else

compare_result.setText('These two messages are different!' +

'nn The SHA-256 code for Message 1 is: n'

+ hexString1.toString() +

'nn The SHA-256 code for Message 2 is: n'

+ hexString2.toString());

}

public void back(View view)

{

setContentView(R.layout.main);

hashing = (ImageButton) findViewById(R.id.hash_btn);

compare = (ImageButton) findViewById(R.id.compare_btn);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

//getMenuInflater().inflate(R.menu.hashing, menu);

return true;

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}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id R.id.action_settings) {

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return true;

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}

return super.onOptionsItemSelected(item);

}

}

Save and run the project, enter your name in to the textbox, click the “Submit” button, the result will be like this.

Click 'hashing' button, we will go in to hash page. If we input a message and hash it, we will get the following result:

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Click 'compare' button, we will go in to compare page. If we input two different messages and compare them, we will get the following

result:

Input two same messages and compare them.

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