无法解密的PHP code的AES的密文黑莓 [英] Unable to decrypt AES's ciphertext of php code in blackberry

问题描述

我正在写一个应用该加密和使用AE​​S（ECB）模式解密数据。
黑莓$ C $的加密数据c由PHP code成功解密。
但问题是，当我从PHP获取加密的文字我不是能与黑莓code..even I M没有得到任何异常解密。

i m writing one application which encrypt and decrypt data using AES (ECB) mode. Encrypted data of blackberry code successfully decrypt by php code. but problem is that when i get encrypted text from php i m not able to decrypt it with blackberry code..even i m not getting any exception.

这是我的code来加密和解密文本。

here is my code to encrypt and decrypt text.

public static  byte[] encrypt( byte[] keyData, byte[] data )
throws CryptoException, IOException
{
    // Create the AES key to use for encrypting the data.
    // This will create an AES key using as much of the keyData
    // as possible.
    AESKey key = new AESKey( keyData );

    // Now, we want to encrypt the data.
    // First, create the encryptor engine that we use for the actual
    // encrypting of the data.
    AESEncryptorEngine engine = new AESEncryptorEngine( key );

    // Since we cannot guarantee that the data will be of an equal block
    // length we want to use a padding engine (PKCS5 in this case).
    PKCS5FormatterEngine fengine = new PKCS5FormatterEngine( engine );

    // Create a BlockEncryptor to hide the engine details away.
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    BlockEncryptor encryptor = new BlockEncryptor( fengine, output );



    encryptor.write( data );

    encryptor.close();
    output.close();


    return output.toByteArray();
}
public static String AESDecryption(byte[] keyData,byte[] cipherText, int dataLength ) throws CryptoException, IOException {

    // Create the input stream based on the ciphertext
    ByteArrayInputStream in = new ByteArrayInputStream( cipherText, 0, dataLength );

    // Now create the block decryptor and pass in a new instance
    // of an AES decryptor engine with the specified block length
    BlockDecryptor cryptoStream = new BlockDecryptor(new AESDecryptorEngine( new AESKey( keyData )), in );

    byte[] T= new byte[dataLength];
    // Read the decrypted text from the AES decryptor stream and
    // return the actual length read

    int length= cryptoStream.read( T );
  String str= new String(T);


  return str;
}

在此先感谢..

thanks in advance..

推荐答案

下面是接收密钥和加密的数据（在字节数组的形式）的方法，并在字节数组的形式返回解密后的数据：

Here is the method that accepts key and encrypted data (in the form of byte arrays) and returns the decrypted data in the form of byte array:

public static byte[] decrypt(byte[] keyData, byte[] ciphertext) 
         throws CryptoException, IOException {

    // First, create the AESKey again.
    AESKey key = new AESKey(keyData);

    // Now, create the decryptor engine.
    AESDecryptorEngine engine = new AESDecryptorEngine(key);
    // Since we cannot guarantee that the data will be of an equal block length
    // we want to use a padding engine (PKCS5 in this case).
    PKCS5UnformatterEngine uengine = new PKCS5UnformatterEngine(engine);

    // Create the BlockDecryptor to hide the decryption details away.
    ByteArrayInputStream input = new ByteArrayInputStream(ciphertext);
    BlockDecryptor decryptor = new BlockDecryptor(uengine, input);

    // Now, read in the data.
    byte[] temp = new byte[100];
    DataBuffer buffer = new DataBuffer();

    for (;;) {
        int bytesRead = decryptor.read(temp);
        buffer.write(temp, 0, bytesRead);

        if (bytesRead < 100) {
            // We ran out of data.
            break;
        }
    }

    byte[] plaintext = buffer.getArray();

    return plaintext;
}

请注意加密/解密不会用绳子直接操作。它只有一个字节数组。因此，作为一个最后的行动，你需要使用字符串（字节[]字节）或字符串（字节[]字节来解密的字节数组转换为字符串，字符串ENC）构造函数。如果你的字符串是连接codeD比ISO-8859-1编码任何其他（这是黑莓手机默认的）第二个构造可能是有用的。

Note encryption/decryption does not operate with strings directly. It only work with byte arrays. So as a final action you need to convert decrypted byte array to string using String(byte[] bytes) or String(byte[] bytes, String enc) constructor. The second constructor can be useful if your string were encoded with any other than "ISO-8859-1" encoding (which is a default one for BlackBerry).

更新：

事实证明你没有使用填充PKCS5在服务器端，你加密的字节数据转换为十六进制字符串，那么解决方案code是：

As it turns out you don't use PKCS5 padding on server side AND you convert encrypted byte data into a HEX string, then the solution code is:

// this is to convert HEX to bytes
public static byte[] convertHexToBytes(String s) {
    int len = s.length();
    byte[] data = new byte[len / 2];
    for (int i = 0; i < len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                             + Character.digit(s.charAt(i+1), 16));
    }
    return data;
}

// this is the same as initial version, but we don't handle PKCS5 padding here
public static byte[] decrypt(byte[] keyData, byte[] ciphertext)
        throws CryptoException, IOException {

    // First, create the AESKey again.
    AESKey key = new AESKey(keyData);

    // Now, create the decryptor engine.
    AESDecryptorEngine engine = new AESDecryptorEngine(key);

    // Create the BlockDecryptor to hide the decryption details away.
    ByteArrayInputStream input = new ByteArrayInputStream(ciphertext);
    BlockDecryptor decryptor = new BlockDecryptor(engine, input);

    // Now, read in the data.
    byte[] temp = new byte[100];
    DataBuffer buffer = new DataBuffer();

    for (;;) {
        int bytesRead = decryptor.read(temp);
        buffer.write(temp, 0, bytesRead);

        if (bytesRead < 100) {
            // We ran out of data.
            break;
        }
    }

    byte[] plaintext = buffer.getArray();

    return plaintext;
}

// and finally :)
String key =       "1234567890123456";
String encrypted = "48b983c4f1575280d244b74cf689efe5";

byte[] keyBytes = key.getBytes();
byte[] encryptedBytes = convertHexToBytes(encrypted);

// displays "nirav bhandari"
Dialog.inform(new String(decrypt(keyBytes, encryptedBytes)));

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