javax.crypto.IllegalBlockSizeException由以下原因引起：android.security.KeyStoreException:输入长度无效

我目前正在制作一个小的安卓程序，它可以存储加密的文件，以后可以加载并解密。我的代码有问题，似乎找不到合适的答案。 我的代码：

因此，它在app load上加载或生成带有prepKeys（）的密钥，并在需要时对文本进行加密/解密

我得到的错误是：

W/System.err: javax.crypto.IllegalBlockSizeException
W/System.err:     at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:513)
W/System.err:     at javax.crypto.Cipher.doFinal(Cipher.java:1741)
W/System.err:     at com.example.aizaku.myapplication.MainActivity.RSADecrypt(MainActivity.java:113)
W/System.err:     at com.example.aizaku.myapplication.MainActivity$1.onClick(MainActivity.java:202)
W/System.err:     at android.view.View.performClick(View.java:6294)
W/System.err:     at android.view.View$PerformClick.run(View.java:24770)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:790)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err:     at android.os.Looper.loop(Looper.java:164)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6494)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
W/System.err: Caused by: android.security.KeyStoreException: Invalid input length
W/System.err:     at android.security.KeyStore.getKeyStoreException(KeyStore.java:697)
W/System.err:     at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.update(KeyStoreCryptoOperationChunkedStreamer.java:132)
W/System.err:     at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.doFinal(KeyStoreCryptoOperationChunkedStreamer.java:217)
W/System.err:     at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:506)
W/System.err:   ... 12 more

当试图在第行解密数据（甚至是小的加密文本“abc”）时，就会发生这种情况

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请帮我找到答案：）

文件有多大？RSA只能加密大约240字节。我不确定。。我该怎么查？嗯。。。只要找出你加密的文件有多大…？查看调试器，它说它是字节[216]aaaand，这太大了。

W/System.err: javax.crypto.IllegalBlockSizeException
W/System.err:     at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:513)
W/System.err:     at javax.crypto.Cipher.doFinal(Cipher.java:1741)
W/System.err:     at com.example.aizaku.myapplication.MainActivity.RSADecrypt(MainActivity.java:113)
W/System.err:     at com.example.aizaku.myapplication.MainActivity$1.onClick(MainActivity.java:202)
W/System.err:     at android.view.View.performClick(View.java:6294)
W/System.err:     at android.view.View$PerformClick.run(View.java:24770)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:790)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err:     at android.os.Looper.loop(Looper.java:164)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6494)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
W/System.err: Caused by: android.security.KeyStoreException: Invalid input length
W/System.err:     at android.security.KeyStore.getKeyStoreException(KeyStore.java:697)
W/System.err:     at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.update(KeyStoreCryptoOperationChunkedStreamer.java:132)
W/System.err:     at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.doFinal(KeyStoreCryptoOperationChunkedStreamer.java:217)
W/System.err:     at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:506)
W/System.err:   ... 12 more

decryptedBytes = cipher1.doFinal(encryptedBytes);