MD5, Base64, Des/3des/ades plus decryption in Android

MD5 Digest algorithm:

<span style= "FONT-SIZE:18PX;" > main code: String s = Edit.gettext (). toString ();    if (Textutils.isempty (s)) {        Toast.maketext (getactivity (), "Digest data is not nullable", Toast.length_short). Show ();    } else {        try {            //Get a digest algorithm            messagedigest instance = messagedigest.getinstance ("MD5");            Byte[] Digest = instance.digest (S.getbytes ("UTF-8"));            StringBuilder builder = new StringBuilder ();            for (byte b:digest) {                builder.append (String.Format ("%2x", B & 0xFF));            }            String replace = builder.tostring (). Replace (', ' 0 '). toUpperCase ();            Text.settext (replace);        } catch (NoSuchAlgorithmException e) {            e.printstacktrace ();        } catch (Unsupportedencodingexception e) {            E.printstacktrace ();}}}    </span>

Base64 Plus decryption:

<span style= "FONT-SIZE:18PX;" > main code: public void OnClick (View v) {switch (V.getid ()) {case R.id.base64_encode:string src_s = sr            C.gettext (). toString ();            if (Textutils.isempty (src_s)) {Toast.maketext (getactivity (), "Original code cannot be empty", Toast.length_short). Show (); } else {try {String s = base64.encodetostring (Src_s.getbytes ("UTF-8"), Base64.defa                    ULT);                Rlt.settext (s);                } catch (Unsupportedencodingexception e) {e.printstacktrace ();        }} break;            Case R.id.base64_decode:string rlt_s = Rlt.gettext (). toString ();            if (Textutils.isempty (rlt_s)) {Toast.maketext (getactivity (), "Encoding is not nullable", Toast.length_short). Show ();                } else {byte[] decode = Base64.decode (rlt_s, Base64.default);  try {src.settext (new String (decode, "UTF-8"));              } catch (Unsupportedencodingexception e) {e.printstacktrace ();    }} break; }}</span>

Des plus decryption:

<span style= "FONT-SIZE:18PX;"    > main code: public void OnClick (view view) {String key_str = Key.gettext (). toString ();    LOG.I ("key_str-----", key_str+ "----");    if (key_str==null) {Toast.maketext (getactivity (), "Key not Nullable", Toast.length_short). Show ();            } else {try {byte[] bytes = key_str.getbytes ("UTF-8");            Byte[] keys = new BYTE[32];            System.arraycopy (bytes, 0, keys, 0, Math.min (bytes.length, keys.length)); In addition to decryption, the key object used, the length of the first parameter byte array must conform to the requirements of the second parameter algorithm.
            Secretkey Secretkey = new Secretkeyspec (keys, "Aes");            Add decryption, use the tool object, tool algorithm and key algorithm must be the same Cipher Cipher = Cipher.getinstance ("Aes");                    Switch (View.getid ()) {case R.id.des_encode:string src_str = Src.gettext (). toString (); if (src_str==null) {Toast.maketext (getactivity (), "The original text is not NULL when encrypting", Toast.length_sho                    RT). Show ();                        } else {//Initialize to Cryptographic mode Cipher.init (Cipher.encrypt_mode, Secretkey);                        byte[] afinal = cipher.dofinal (Src_str.getbytes ("UTF-8"));                    Rlt.settext (Base64.encodetostring (afinal, Base64.default));                } break;                    Case R.id.des_decode:string rlt_str = Rlt.gettext (). toString (); if (rlt_str==null) {Toast.maketext (getactivity (), "decrypted. Ciphertext cannot be empty ", toast.length_short). ShoW ();                        } else {cipher.init (Cipher.decrypt_mode, Secretkey);                        byte[] afinal = cipher.dofinal (Base64.decode (Rlt_str, Base64.default));                    Src.settext (New String (afinal, "UTF-8"));            } break;        }} catch (Unsupportedencodingexception e) {e.printstacktrace ();        } catch (NoSuchAlgorithmException e) {e.printstacktrace ();        } catch (Nosuchpaddingexception e) {e.printstacktrace ();        } catch (InvalidKeyException e) {e.printstacktrace ();        } catch (Badpaddingexception e) {e.printstacktrace ();        } catch (Illegalblocksizeexception e) {e.printstacktrace (); }}}</span>

Source code Address:

http://download.csdn.net/detail/lzq520210/9419823

MD5, Base64, Des/3des/ades plus decryption in Android