相关疑难解决方法(0)

首先,我已经看到 Android 4.2 在Android 4.2 和提供的解决方案上破坏了我的AES加密/解密代码 和 加密错误:

SecureRandom sr = null;
if (android.os.Build.VERSION.SDK_INT >= JELLY_BEAN_4_2) {
    sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
} else {
    sr = SecureRandom.getInstance("SHA1PRNG");
}

对我不起作用,因为,当解码Android 4.2中Android <4.2加密的数据时,我得到:

javax.crypto.BadPaddingException: pad block corrupted
at com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:709)

我的代码很简单,直到Android 4.2才开始工作:

public static byte[] encrypt(byte[] data, String seed) throws Exception {

    KeyGenerator keygen = KeyGenerator.getInstance("AES");
    SecureRandom secrand = SecureRandom.getInstance("SHA1PRNG");
    secrand.setSeed(seed.getBytes());
    keygen.init(128, secrand);

    SecretKey seckey = keygen.generateKey();
    byte[] rawKey = seckey.getEncoded();

    SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
    Cipher cipher = …

以下代码适用于除最新4.2之外的所有Android版本

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * Util class to perform encryption/decryption over strings. <br/>
 */
public final class UtilsEncryption
{
    /** The logging TAG */
    private static final String TAG = UtilsEncryption.class.getName();

    /** */
    private static final String KEY = "some_encryption_key";

    /**
     * Avoid instantiation. <br/>
     */
    private UtilsEncryption()
    {
    }

    /** The HEX characters */
    private final static String HEX = "0123456789ABCDEF"; …

我需要将加密数据从Java客户端发送到C#服务器.现在我正在学习如何使用AES(要求)加密数据.继这个接受的答案用AES加密/解密我正在做以下事情:

byte[] keyStart = "qweroiwejrwoejlsifeoisrn".getBytes(); // Random character string

byte[] toEncrypt = myMessageString.getBytes();

keyGen = KeyGenerator.getInstance("AES");
sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(keyStart);
keyGen.init(128, sr);
SecretKey secretKey = keyGen.generateKey();
byte[] secretKeyByte = secretKey.getEncoded();

SecretKeySpec skeySpec = new SecretKeySpec(secretKeyByte, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
cipher.doFinal(toEncrypt);

由于算法使用了一个SecureRandom使用keyStart我不知道这是否可以解码,C#甚至在另一个Java程序中解码,没有SecureRandom.

这个加密/解密是否能够只知道keyStart我正在使用的值或者因为SecureRandom我仍然需要传递其他东西才能解密？

还有,有更好的方法来做这个还是这个好吗？

最近从BC 1.34升级到1.45.我用以下方法解码一些以前编码的数据:

    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal(encrypted);

当使用BC 1.45时,我得到了这个例外:

javax.crypto.BadPaddingException: pad block corrupted
 at org.bouncycastle.jce.provider.JCEBlockCipher.engineDoFinal(JCEBlockCipher.java:715)
 at javax.crypto.Cipher.doFinal(Cipher.java:1090)

编辑:有关此问题的更多信息.我使用以下方法从密码短语生成原始密钥:

    KeyGenerator kgen = KeyGenerator.getInstance("AES", "BC");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
    sr.setSeed(seed);
    kgen.init(128, sr);
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();

我发现,这导致BC 1.34和1.45两个不同的值.

它可能也不是BouncyCastle相关的(我在Android 2.3上测试)

我正在制作一个Android应用程序,我想在将其发送到DataBase之前对其进行加密,并且加密是正确的.解密String时会出现问题,因为我收到了BadPaddingException并且我不知道问题出在哪里.这是代码:

public final static String HEX = "36A52C8FB7DF9A3F";

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);
}

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 …