Encrypt and decrypt a string in android

Question

Hi, I want to encrypt a string in android inorder for storage, and then for display I need to decrypt it. Is it possible to use md5 hashing or any other hashing in android. Please provide me an example.

Answer 1

Read this article here → (How_to_encrypt_and_decrypt_strings.rhtml) . This is pretty much what you want. The method used is used. .getInstance("AES");If you want, MD5 simply replaces AES with MD5.

Answer 2

The javax.crypto package does everything you need

http://developer.android.com/reference/javax/crypto/package-summary.html

Answer 3

/ String Android

Answer 4

MAHEncryptorLibrary

:

• MAHEncryptor mahEncryptor = MAHEncryptor.newInstance("This is sample SecretKeyPhrase");
  String encrypted = mahEncryptor.encode("This is MAHEncryptorLib java sample");
  

• MAHEncryptor mahEncryptor = MAHEncryptor.newInstance("This is sample SecretKeyPhrase");
  String decrypted = mahEncryptor.decode("4Vi86K/JL9gKclQahacrKLrEZL6/0vOpS4yPVm1hSLhhDsCMJTyd4A==");
  

Answer 5

android.util.Base64 , -, . :

:

:

public void saveSomeText (String text) {
    SharedPreferences.Editor editor = prefs.edit();
    if (Utils.isEmpty( text ))
        text = null;
    else
        text = Base64.encodeToString( text.getBytes(), Base64.DEFAULT );
    editor.putString( "some_text", text );
    editor.commit();
}

:

public String getSomeText () {
    String text = prefs.getString( "some_text", null );
    if (!Utils.isEmpty( passwd )) {
        text = new String( Base64.decode( text, Base64.DEFAULT ) );
    }
    return text;
}

Answer 6

, , . , .

    final int shift_key = 4; //it is the shift key to move charcter, like if i have 'a' then a=97+4=101 which =e and thus it changes
    String plainText = "adhami piran"; 
    char character; 
     char ch[]=new char[plainText.length()];//for storing encrypt char
   for (int iteration = 0; iteration < plainText.length(); iteration++)
            {
                    character = plainText.charAt(iteration); //get characters
                    character = (char) (character + shift_key); //perform shift
              }     ch[iteration]=character;//assign char to char array
     String encryptstr = String.valueOf(ch);//converting char array to string
     Toast.makeText(this, "Encrypt string is "+ encryptstr Toast.LENGTH_LONG).show();

   for(int i=0;i<encryptstr.length();i++)
     {
        character=str.charAt(i);
        character = (char) (character -shift_key); //perform shift
            ch[i]=character;
     }
 Stirng decryptstr = String.valueOf(ch);
     Toast.makeText(this, "Decrypted String is "+decryptstr, Toast.LENGTH_LONG).show();