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POHow to decrypting the php encrypted string using android?
 

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  1. POHow to decrypting the php encrypted string using android?
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    <p>Hi I want to decrypting my php encrypted string. My code is</p> <p><strong>UsingPHP.java</strong></p> <pre><code>import java.io.UnsupportedEncodingException; import java.util.ArrayList; import org.apache.http.NameValuePair; import org.json.JSONArray; import org.json.JSONObject; import android.app.Activity; import android.os.Bundle; import android.util.Base64; import android.view.View; import android.widget.Button; import android.widget.TextView; public class UsingPHP extends Activity { TextView encrypt_txt1, encrypt_txt2, decrypt_txt1, decrypt_txt2; Button decrypt_but; String original_value = ""; String encrypted_value = ""; byte[] byteArray1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.decrypt); encrypt_txt1 = (TextView) findViewById(R.id.entv1); encrypt_txt2 = (TextView) findViewById(R.id.entv2); decrypt_txt1 = (TextView) findViewById(R.id.decrytv1); decrypt_txt2 = (TextView) findViewById(R.id.decrytv2); decrypt_but = (Button) findViewById(R.id.decrybt); decrypt_but.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) { try { ArrayList &lt; NameValuePair &gt; postParameters = new ArrayList &lt; NameValuePair &gt; (); String response = null; response = CustomHttpClient.executeHttpPost( "http://10.0.2.2/cyrpt/encrypt.php", postParameters); String res = response.toString(); System.out.println("HTTP Response comes here......."); System.out.println(res); JSONArray jArray = new JSONArray(res); System.out.println("JSON Array created....."); JSONObject json_data = null; System.out.println("JSON data created......"); for (int i = 0; i &lt; jArray.length(); i++) { System.out.println("values fetched from the database....."); json_data = jArray.getJSONObject(i); original_value = json_data.getString("value"); encrypted_value = json_data.getString("encryptedvalue"); encrypt_txt2.setText(encrypted_value); System.out.println(original_value); System.out.println(encrypted_value); } System.out.println("Decrypt button has been clicked"); System.out.println("My encryption string is---&gt;" + encrypted_value); int encrypt_len = encrypted_value.length(); System.out.println(encrypt_len); try { System.out.println("Encrypted values going to decrrypted......"); byteArray1 = Base64.decode(encrypted_value, encrypt_len); String decrypt = new String(byteArray1, "UTF-8"); System.out.println("Values decrypted--&gt;" + decrypt); decrypt_txt2.setText(decrypt); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } catch (Exception e) { e.printStackTrace(); } } }); } } </code></pre> <p><strong>encrypt.php</strong></p> <pre><code>&lt;?php require_once("connection.php"); $value = 'malavika'; function encode5t($value1) { for ($i = 0; $i &lt; 3; $i++) { $value1 = strrev(base64_encode($value1)); } return $value1; } $myvalue = encode5t($value); $mydata = mysql_query("SELECT * FROM crypt"); while ($row = mysql_fetch_assoc($mydata)) $sam = $row['value']; if ($sam != 'malavika') $myinsert = mysql_query("insert into crypt values('" . $value . "','" . $myvalue . "')") or die(mysql_error()); $data = mysql_query("SELECT * FROM crypt"); while ($row = mysql_fetch_assoc($data)) $output[] = $row; print(json_encode($output)); ?&gt; </code></pre> <p>Now I want to decrypt my encrypted value in android. But I got this following warning:</p> <pre><code> 12-23 10:27:19.343: WARN/System.err(609): java.lang.IllegalArgumentException: bad base-64 12-23 10:27:19.353: WARN/System.err(609): at android.util.Base64.decode(Base64.java:161) 12-23 10:27:19.353: WARN/System.err(609): at android.util.Base64.decode(Base64.java:136) 12-23 10:27:19.363: WARN/System.err(609): at android.util.Base64.decode(Base64.java:118) 12-23 10:27:19.363: WARN/System.err(609): at com.my.databaseconnection.UsingPHP$1.onClick(UsingPHP.java:76) 12-23 10:27:19.363: WARN/System.err(609): at android.view.View.performClick(View.java:2485) 12-23 10:27:19.363: WARN/System.err(609): at android.view.View$PerformClick.run(View.java:9080) 12-23 10:27:19.363: WARN/System.err(609): at android.os.Handler.handleCallback(Handler.java:587) 12-23 10:27:19.373: WARN/System.err(609): at android.os.Handler.dispatchMessage(Handler.java:92) 12-23 10:27:19.373: WARN/System.err(609): at android.os.Looper.loop(Looper.java:123) 12-23 10:27:19.373: WARN/System.err(609): at android.app.ActivityThread.main(ActivityThread.java:3647) 12-23 10:27:19.383: WARN/System.err(609): at java.lang.reflect.Method.invokeNative(Native Method) 12-23 10:27:19.383: WARN/System.err(609): at java.lang.reflect.Method.invoke(Method.java:507) 12-23 10:27:19.383: WARN/System.err(609): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-23 10:27:19.383: WARN/System.err(609): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-23 10:27:19.393: WARN/System.err(609): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>How can I do this? Is it possible? Can anybody tell me? Thanks in advance</p>
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    1. USVipul Shah
    1. USmalavika
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      1. POHow to decrypting the php encrypted string using android?
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    1. COIt seems like PHP and Java have different implementations of `base-64`.
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      1. POHow to decrypting the php encrypted string using android?
      1. USBlender
    2. COIs it possible or not? Any other way to achieve this?
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      1. POHow to decrypting the php encrypted string using android?
      1. USmalavika
    3. CO`byteArray1 = Base64.decode(encrypted_value, encrypt_len);` <- the second parameter of [`Base64.decode`](http://developer.android.com/reference/android/util/Base64.html#decode%28java.lang.String,%20int%29) does not contain the length but rather flags for the decoding-method. This can lead to different results depending on the string size. Try this: `byteArray1 = Base64.decode(encrypted_value, Base64.DEFAULT)`
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      1. POHow to decrypting the php encrypted string using android?
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