android中的MD5、Base64、DES/3DES/ADES加解密

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MD5摘要演算法：

<span style="font-size:18px;">主要代碼： String s = edit.getText().toString();    if (TextUtils.isEmpty(s)){        Toast.makeText(getActivity(), "摘要資料不可為空白", Toast.LENGTH_SHORT).show();    } else {        try {            //擷取一種摘要演算法            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加解密：

<span style="font-size:18px;">主要代碼：public void onClick(View v) {    switch (v.getId()){        case R.id.base64_encode:            String src_s = src.getText().toString();            if (TextUtils.isEmpty(src_s)){                Toast.makeText(getActivity(), "原碼不可為空白", Toast.LENGTH_SHORT).show();            } else {                try {                    String s = Base64.encodeToString(src_s.getBytes("UTF-8"), Base64.DEFAULT);                    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(), "編碼不可為空白", 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加解密：

<span style="font-size:18px;">主要代碼：public void onClick(View view) {    String key_str = key.getText().toString();    Log.i("key_str-----",key_str+"----");    if (key_str==null){        Toast.makeText(getActivity(), "密鑰不可為空白", 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));            //加解密時， 用到的key對象, 第一個參數的byte數組的長度必須符合第二個參數演算法的要求。
            SecretKey secretKey = new SecretKeySpec(keys, "Aes");            //加解密時，用到的工具對象，工具的演算法和key的演算法必須一樣            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(), "加密時，原文不可為空白", Toast.LENGTH_SHORT).show();                    } else {                        //初始化為加密模式                        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(), "解密時。密文不可為空白", 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>

原始碼地址：

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

android中的MD5、Base64、DES/3DES/ADES加解密