Android 几种加密解密的方法（仅代码）
1.Base64
编码：
byte[] encode = Base64.encode(str.getBytes(), Base64.DEFAULT);
new String(encode)
解码：
byte[] decode = Base64.decode(result, Base64.DEFAULT);
new String(decode)
2.
URLEncoder
编码：
String encode = URLEncoder.encode(content, "UTF-8");
解码：
String decode = URLDecoder.decode(result, "UTF-8");
3.
Des
加密：
try { // 初始化 设置加密解密的类型 Cipher cipher = Cipher.getInstance("DES"); // 初始化密码 SecretKeySpec keySpec = new SecretKeySpec(str.getBytes(),"DES"); try { //设置此次操作是加密还是解密 cipher.init(Cipher.ENCRYPT_MODE,keySpec); // 加密 final byte[] finalResult = cipher.doFinal(password.getBytes()); //经过base64处理避免出现乱码情况 byte[] encode = Base64.encode(finalResult, Base64.DEFAULT); String result = new String(encode); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); }
解密：
try { Cipher cipherDecode = Cipher.getInstance("DES"); SecretKeySpec spec = new SecretKeySpec(password.getBytes(),"DES"); cipherDecode.init(Cipher.DECRYPT_MODE,spec); // 获取textView加密后的结果 byte[] decode = Base64.decode(result, Base64.DEFAULT); byte[] doFinal = cipherDecode.doFinal(decode); String result = new String(doFinal); } 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(); }4.Aes
加密：
try { // 初始化 设置加密解密的类型 Cipher cipher = Cipher.getInstance("AES"); // 初始化密码 SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(),"AES"); try { //设置此次操作是加密还是解密 cipher.init(Cipher.ENCRYPT_MODE,keySpec); // 加密 final byte[] finalResult = cipher.doFinal(str.getBytes()); //经过base64处理避免出现乱码情况 byte[] encode = Base64.encode(finalResult, Base64.DEFAULT); String result = new String(encode); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); }
解密：
try { Cipher cipherDecode = Cipher.getInstance("AES"); SecretKeySpec spec = new SecretKeySpec(passwords.getBytes(),"AES"); cipherDecode.init(Cipher.DECRYPT_MODE,spec); // 获取textView加密后的结果 byte[] decode = Base64.decode(result, Base64.DEFAULT); byte[] doFinal = cipherDecode.doFinal(decode); String result = new String(doFinal); } 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(); }5.RSA
private PublicKey mPublicKey; private PrivateKey mPrivateKey;
//生成公钥和密钥
try { // 初始化密码对生成器 KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA"); // 设置密码的长度 generator.initialize(1024); // 生成密码对 KeyPair keyPair = generator.generateKeyPair(); // 获取公钥 mPublicKey = keyPair.getPublic(); //获取私钥 mPrivateKey = keyPair.getPrivate(); //////////////////////////把私钥存储String到本地////////////////////////////// byte[] mPrivateKeyEncoded = mPrivateKey.getEncoded(); byte[] encode = Base64.encode(mPrivateKeyEncoded, Base64.DEFAULT); String key = new String(encode); SharedPreferences sp = getSharedPreferences("day02", Context.MODE_PRIVATE); SharedPreferences.Editor edit = sp.edit(); edit.putString("privateKey",key); edit.commit(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
加密：
try {
Cipher cipher = Cipher.getInstance("RSA"); // 设置加密或者解密模式 ，传入公钥 cipher.init(Cipher.ENCRYPT_MODE,mPublicKey); byte[] encode = cipher.doFinal(content.getBytes()); byte[] bytes = Base64.encode(encode, Base64.DEFAULT); String result = new String(bytes); } 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(); }
解密：
String result = mTextView.getText().toString(); byte[] decode = Base64.decode(result, Base64.DEFAULT); try { Cipher ciphers = Cipher.getInstance("RSA"); ciphers.init(Cipher.DECRYPT_MODE,mPrivateKey); byte[] bytes = ciphers.doFinal(decode); String result = new String(bytes); } 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(); }
通过服务器给我们的字符串来解密
// 1 通过字符串生成私钥 SharedPreferences sharedPreferences = getSharedPreferences("wenjian", Context.MODE_PRIVATE); String stringKey = sharedPreferences.getString("privateKey", ""); if (TextUtils.isEmpty(stringKey)){ Log.d("TAG", "onClick: 私钥没有存成功"); return; }else { Log.d("TAG", "onClick: StringKey == "+stringKey); } //因为我们存私钥的经过Base64编码过，所以我们必须解码回去 byte[] bytesKey = Base64.decode(stringKey, Base64.DEFAULT); // 通过byte数组生成公钥或者私钥 PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(bytesKey); KeyFactory factory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = factory.generatePrivate(spec); // 2 解密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE,privateKey); byte[] decode = Base64.decode(result, Base64.DEFAULT); byte[] doFinal = cipher.doFinal(decode); mTextView.setText(new String(doFinal)); isEncode = false; } 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(); } catch (InvalidKeySpecException e) { e.printStackTrace(); }
6.MD5摘要
//摘要 try { // 初始化 MessageDigest digest = MessageDigest.getInstance("MD5"); //指定 byte数组来进行摘要 digest.update(str.getBytes()); // 获取摘要的结果 byte[] results = digest.digest(); // 创建Buffer来累加字符串 StringBuffer buffer = new StringBuffer(); for (int i = 0; i < results.length; i++) { byte result = results[i]; // 把得到结果 传化成16进制的字符串 String s = Integer.toHexString(result & 0xFF); if (s.length() == 1) { buffer.append("0"); } buffer.append(s); } String result = buffer.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }7.
Sha1
//摘要 try { // 初始化 MessageDigest digest = MessageDigest.getInstance("SHA1"); //指定 byte数组来进行摘要 digest.update(content.getBytes()); // 获取摘要的结果 byte[] results = digest.digest(); // 创建Buffer来累加字符串 StringBuffer buffer = new StringBuffer(); for (int i = 0; i < results.length; i++) { byte result = results[i]; // 把得到结果 传化成16进制的字符串 String s = Integer.toHexString(result & 0xFF); // if (s.length()==1){ buffer.append("0"); } buffer.append(s); } String result = buffer.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
这里仅仅是几种加密解密的代码，具体介绍有时间再做，基本也就这么多东西，能用就行了。