EncryptHelper

Android data localized safely encryption/decryption tool. 数据安全本地化加密解密工具。

Gradle

root project:build.gradle

  allprojects {
	 repositories {
		...
		maven { url "https://jitpack.io" }
	 }
  }

app:build.gradle

  dependencies {
     // e.g. compile 'com.github.woxingxiao:EncryptHelper:1.2'
     compile 'com.github.woxingxiao:EncryptHelper:${LATEST_VERSION}'
  }

Theory

AES（对称加密）的Key想要保存在KeyStore里，需要Api 23才被支持，但是RSA（非对称加密）不受限制（Api >= 18）。 因此使用RSA加密AES Key（对称加密密钥）保存到本地（本库保存在SharedPreferences），需要时使用RSA解密AES Key， 最终使用解密后的AES Key来加密和解密。 过程：

1. 使用KeyStore生成随机的RSA Key（非对称加密密钥，包含公钥和私钥，Alias本库使用应用的包名）；
2. 生成AES Key，并用RSA PublicKey（公钥）加密后存入SharedPreferences；
3. 从SharedPreferences取出AES Key，并用RSA PrivateKey（私钥）解密AES Key，使用解密后的AES Key来加密和解密。

Usage (Api >= 18)

EncryptHelper mEncryptHelper = new EncryptHelper(getApplicationContext());

mEncryptHelper.encrypt(plainText);

mEncryptHelper.decrypt(encryptedText);

Thanks

drakeet
Joe Tsai

License

   Copyright 2017 woxingxiao

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.