原文地址:http://blog.163.com/jr_yijie/blog/static/239835922201721365436916/
由于项目的优化改进,用到AES+RSA加密传输数据。于是,在网上摘录了网友们的AES算法,如下:
public static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
public static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
一切正常的在Android 4.3-6.1的手机上加解密,但是我用 LGE Nexus 5X (7.1.1 API 25)上发现在Android N上 google去掉了Crypto provider,意味着我们将不能继续像上面那样对数据加密填充。当然,在studio里的Logcat里会提示前往关于Android N对Crypto的解决方案:
http://android-developers.blogspot.com/2016/06/security-crypto-provider-deprecated-in.html
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另外,我在一篇文章里最终找到了解决方案:
http://stackoverflow.com/questions/39097099/security-crypto-provider-deprecated-in-android-n/42337802#42337802
经过测试,改方案不仅解决了7.0的问题,也向下兼容了4.2-6.1的手机系统。(具体为什么能解决,原谅博主对Android 源码不是很深究,特别是security这块儿。
)
好了,这次困扰了近2小时的问题总算解决了
。希望也能帮助到各位小伙伴。
解决方法:
You can use this provider replacing "Crypto" for SecureRandom, its working for me fine:
Use,
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", new CryptoProvider());
instead of,
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG","Crypto");
and your CryptoProvider class like as below,
import java.security.Provider;
/**
* Implementation of Provider for SecureRandom. The implementation supports the
* "SHA1PRNG" algorithm described in JavaTM Cryptography Architecture, API
* Specification & Reference
*/
public final class CryptoProvider extends Provider {
/**
* Creates a Provider and puts parameters
*/
public CryptoProvider() {
super("Crypto", 1.0, "HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)");
put("SecureRandom.SHA1PRNG",
"org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl");
put("SecureRandom.SHA1PRNG ImplementedIn", "Software");
}
}