android中的MD5、Base64、DES/3DES/ADES加解密

String s = edit.getText().toString();
if (TextUtils.isEmpty(s)){
Toast.makeText(getActivity(), "摘要数据不可为空", Toast.LENGTH_SHORT).show();
} else {
try {
//获取一种摘要算法
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();
}
}
}

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(), "原码不可为空", 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(), "编码不可为空", 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;
}
}

public void onClick(View view) {
String key_str = key.getText().toString();
Log.i("key_str-----",key_str+"----");
if (key_str==null){
Toast.makeText(getActivity(), "密钥不可为空", 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));
//加解密时， 用到的key对象, 第一个参数的byte数组的长度必须符合第二个参数算法的要求。
SecretKey secretKey = new SecretKeySpec(keys, "Aes");
//加解密时，用到的工具对象，工具的算法和key的算法必须一样
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(), "加密时，原文不可为空", Toast.LENGTH_SHORT).show();
} else {
//初始化为加密模式
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(), "解密时，密文不可为空", 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();
}
}
}