带有Bouncy Castle的256位AES / CBC / PKCS5Padding

这应该为您工作：

public String dec(String password, String salt, String encString)        throws Exception {    byte[] ivData = toByte(encString.substring(0, 32));    byte[] encData = toByte(encString.substring(32));    // get raw key from password and salt    PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), toByte(salt), 50, 256);    SecretKeyFactory keyFactory = SecretKeyFactory .getInstance("PBEWithSHA256And256BitAES-CBC-BC");    SecretKeySpec secretKey = new SecretKeySpec(keyFactory.generateSecret( pbeKeySpec).getEnpred(), "AES");    byte[] key = secretKey.getEnpred();    // setup cipher parameters with key and IV    KeyParameter keyParam = new KeyParameter(key);    CipherParameters params = new ParametersWithIV(keyParam, ivData);    // setup AES cipher in CBC mode with PKCS7 padding    BlockCipherPadding padding = new PKCS7Padding();    BufferedBlockCipher cipher = new PaddedBufferedBlockCipher( new CBCBlockCipher(new AESEngine()), padding);    cipher.reset();    cipher.init(false, params);    // create a temporary buffer to depre into (it'll include padding)    byte[] buf = new byte[cipher.getOutputSize(encData.length)];    int len = cipher.processBytes(encData, 0, encData.length, buf, 0);    len += cipher.doFinal(buf, len);    // remove padding    byte[] out = new byte[len];    System.arraycopy(buf, 0, out, 0, len);    // return string representation of depred bytes    return new String(out, "UTF-8");}

我假设您实际上是在进行十六进制编码，

toByte()