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
解决方案：
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", new CryptoProvider());
代替
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG","Crypto");
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");
}
}
