密码盘块在姜饼上损坏 [英] Cipher pad block corrupted on Gingerbread

问题描述

我相信这是一个来自 androidsnippets.org 的片段 - 为什么这不是Android 2.3 的功能？如何修复？

I believe this is a snippet from androidsnippets.org - why this isn't funcioning on Android 2.3? How to fix it?

错误

03-05 23:19:17.479: WARN/System.err(3598): javax.crypto.BadPaddingException: pad block corrupted
03-05 23:19:17.518: WARN/System.err(3598):     at org.bouncycastle.jce.provider.JCEBlockCipher.engineDoFinal(JCEBlockCipher.java:715)
03-05 23:19:17.518: WARN/System.err(3598):     at javax.crypto.Cipher.doFinal(Cipher.java:1090)

我发现这个主题的几个答案，但是找不到如何修复这个，添加 NoPadding 参数或不同的算法或..？

I found several answers on this topic but I couldn't find a decent way how to fix this, add NoPadding parameter or different algorithm or..?

public static String code(String stringToCode) {
    try {
        stringToCode = encrypt("somekey",stringToCode);
    } catch (Exception e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    return stringToCode;
}

public static String decode(String stringToDecode) {
    try {
        stringToDecode = decrypt("somekey",stringToDecode);
    } catch (Exception e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    return stringToDecode;
}

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));
}

推荐答案

BouncyCastle a href =https://stackoverflow.com/questions/4405334/bouncycastle-aes-error-when-upgrading-to-1-45>升级到1.45时出现BouncyCastle AES错误）。

It's problem with BouncyCastle (BouncyCastle AES error when upgrading to 1.45).

我发现这个
导致BC
1.34和1.45两个不同的值。

What I have found is that this results in two different values for BC 1.34 vs 1.45.

我找不到解决方案，但... ...

I couldn't find the solution, yet...

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