Question

我正在使用提供的代码在android中尝试加密/解密这里： http://iamvijayakumar.blogspot.com/2013/10/android-example-for-encrypt-and-decrypt.html

该代码适用于运行android 4.1的设备，但似乎无法在Android 5.0.1设备中运行

错误日志在下面提供。

AESHelper Class：

package com.myapplication;



import javax.crypto.KeyGenerator;

    import java.security.SecureRandom;

    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;

public class AESHelper {

public static String encrypt(String seed, String cleartext) throws Exception {
    byte[] rawKey = getRawKey(seed.getBytes());
    byte[] result = encrypt(rawKey, cleartext.getBytes());
    return toHex(result);
}

public static String decrypt(String seed, String encrypted) throws Exception {
    byte[] rawKey = getRawKey(seed.getBytes());
    byte[] enc = toByte(encrypted);
    byte[] result = decrypt(rawKey, enc);
    return new String(result);
}

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(seed);
    kgen.init(128, sr); // 192 and 256 bits may not be available
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}


private 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;
}

private 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 String toHex(String txt) {
    return toHex(txt.getBytes());
}
public static String fromHex(String hex) {
    return new String(toByte(hex));
}

public static byte[] toByte(String hexString) {
    int len = hexString.length()/2;
    byte[] result = new byte[len];
    for (int i = 0; i < len; i++)
        result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
    return result;
}

public static String toHex(byte[] buf) {
    if (buf == null)
        return "";
    StringBuffer result = new StringBuffer(2*buf.length);
    for (int i = 0; i < buf.length; i++) {
        appendHex(result, buf[i]);
    }
    return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
    sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}


}

MainActivity Calss：

package com.myapplication;

 import android.os.Bundle;
 import android.app.Activity;
 import android.util.Log;
 import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;



 public class MainActivity extends Activity {

String seedValue = "This Is MySecure";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String normalText = "ABCD";
    String normalTextEnc;
    try {
        normalTextEnc = AESHelper.encrypt(seedValue, normalText);
        String normalTextDec = AESHelper.decrypt(seedValue, normalTextEnc);
        TextView txe = new TextView(this);
        txe.setTextSize(14);
        txe.setText("Normal Text ::"+normalText +" \n Encrypted Value :: "+normalTextEnc +" \n Decrypted value :: "+normalTextDec);
        setContentView(txe);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        Log.e("MYAPP", "exception", e);
    }



}

日志：

07-02 21:06:45.545 11608-11608/com.myapplication E/MYAPP: exception
                                                                      javax.crypto.BadPaddingException: pad block corrupted
                                                                          at com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:854)
                                                                          at javax.crypto.Cipher.doFinal(Cipher.java:1340)
                                                                          at com.dhungana.aditya.myapplication.AESHelper.decrypt(AESHelper.java:54)
                                                                          at com.dhungana.aditya.myapplication.AESHelper.decrypt(AESHelper.java:27)
                                                                          at com.dhungana.aditya.myapplication.MainActivity.onCreate(MainActivity.java:27)
                                                                          at android.app.Activity.performCreate(Activity.java:5933)
                                                                          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2376)
                                                                          at android.app.ActivityThread.access$800(ActivityThread.java:147)
                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1281)
                                                                          at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                          at android.os.Looper.loop(Looper.java:135)
                                                                          at android.app.ActivityThread.main(ActivityThread.java:5253)
                                                                          at java.lang.reflect.Method.invoke(Native Method)
                                                                          at java.lang.reflect.Method.invoke(Method.java:372)
                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:948)
                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:743)

Answer 1

如果输入不是密钥长度的精确倍数，则可能需要声明填充算法。

尝试使用“AES / CBC / PKCS5Padding”

实例化密码

BadPaddingException：在尝试AES incryption / decryption时，android 5.0中的pad块被破坏了

1 个答案: