报错：
03-22 10:21:20.805 507-507/? E/AndroidRuntime: FATAL EXCEPTION: main
03-22 10:21:20.805 507-507/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{tech.androidstudio.encodecryp/tech.androidstudio.encodecryp.MainActivity}: java.lang.ArrayIndexOutOfBoundsException: too much data for RSA block03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:123)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:3683)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:507)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: Caused by: java.lang.ArrayIndexOutOfBoundsException: too much data for RSA block
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at org.bouncycastle.jce.provider.JCERSACipher.engineDoFinal(JCERSACipher.java:449)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at javax.crypto.Cipher.doFinal(Cipher.java:1090)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at tech.androidstudio.encodecryp.CryptUtil.rsaDecrypt(CryptUtil.java:75)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at tech.androidstudio.encodecryp.MainActivity.rsaTest(MainActivity.java:154)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at tech.androidstudio.encodecryp.MainActivity.onCreate(MainActivity.java:36)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:123)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:3683)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:507)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-22 10:21:20.805 507-507/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
原因：第二个问题也是由第一个乱码的问题引起的：
代码：
public void rsaTest(){String data = "Hello， Kodulf is a good father, 千雅爸爸是个好爸爸";byte[] bytes = data.getBytes();byte[] encryptByte = CryptUtil.rsaEncrypt(bytes, mPrivate);String encryptString = new String(encryptByte);//这里产生乱码Log.d("kodulf","Hello， Kodulf is a good father, 千雅爸爸是个好爸爸 加密后:"+encryptString);//解密：byte[] sourceBytes = encryptString.getBytes();//这里会报错java.lang.ArrayIndexOutOfBoundsException: too much data for RSA blockbyte[] decryptBytes = CryptUtil.rsaDecrypt(sourceBytes, mPublic);String decryptString = new String(decryptBytes);Log.d("kodulf","Hello， Kodulf is a good father, 千雅爸爸是个好爸爸 解密后:"+decryptString);}获取的时候直接就将数据输出了，而没有通过Base64来进行处理，如果通过Base64来进行处理了,就不会显示乱码，Base64 也就是将非Ascii的码变成可以读取的字符
解决办法：
添加Base64到代码里面，如下：
public void rsaTest(){String data = "Hello， Kodulf is a good father, 千雅爸爸是个好爸爸";byte[] bytes = data.getBytes();byte[] encryptByte = CryptUtil.rsaEncrypt(bytes, mPrivate);//要使用Base64来进行编码，如果不这样做就会显示乱码//String encryptString = new String(encryptByte);//这里产生乱码String encryptString = Base64.encodeToString(encryptByte, Base64.NO_WRAP);Log.d("kodulf","Hello， Kodulf is a good father, 千雅爸爸是个好爸爸 加密后:"+encryptString);//解密：//要使用Base64来进行解码，如果不这样做就会显示乱码//byte[] sourceBytes = encryptString.getBytes();//这里会报错java.lang.ArrayIndexOutOfBoundsException: too much data for RSA blockbyte[] sourceBytes = Base64.decode(encryptString.getBytes(), Base64.NO_WRAP);byte[] decryptBytes = CryptUtil.rsaDecrypt(sourceBytes, mPublic);String decryptString = new String(decryptBytes);Log.d("kodulf","Hello， Kodulf is a good father, 千雅爸爸是个好爸爸 解密后:"+decryptString);}