我正在尝试将 Java 的 DESede
解密转换为 PHP 的版本。然而,对于相同的输入,PHP 无法提供相同的输出。
Java:
public class ThreeDES {
private KeySpec keySpec;
private SecretKeyFactory keyFactory;
private Cipher cipher;
public ThreeDES( String encryptionScheme, String encryptionKey )
throws EncryptionException {
try {
byte[] keyAsBytes = encryptionKey.getBytes("UTF-8");
keySpec = new DESedeKeySpec(keyAsBytes);
keyFactory = SecretKeyFactory.getInstance(encryptionScheme);
cipher = Cipher.getInstance(encryptionScheme);
} catch (InvalidKeyException e)
{
throw new EncryptionException( e );
}
catch (UnsupportedEncodingException e)
{
throw new EncryptionException( e );
}
catch (NoSuchAlgorithmException e)
{
throw new EncryptionException( e );
}
catch (NoSuchPaddingException e)
{
throw new EncryptionException( e );
}
}
public String decrypt( String encryptedString ) throws EncryptionException {
try {
SecretKey key = keyFactory.generateSecret( keySpec );
cipher.init( Cipher.DECRYPT_MODE, key );
BASE64Decoder base64decoder = new BASE64Decoder();
byte[] cleartext = base64decoder.decodeBuffer(encryptedString);
byte[] ciphertext = cipher.doFinal(cleartext);
return bytes2String( ciphertext );
}
catch (Exception e)
{
throw new EncryptionException( e );
}
}
private static String bytes2String( byte[] bytes )
{
StringBuffer stringBuffer = new StringBuffer();
for (int i = 0; i < bytes.length; i++)
{
stringBuffer.append( (char) bytes[i] );
}
return stringBuffer.toString();
}
}
PHP:
function decrypt($key, $data) {
$mcrypt_module = mcrypt_module_open(MCRYPT_TRIPLEDES, '', MCRYPT_MODE_ECB, '');
$mcrypt_iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($mcrypt_module), MCRYPT_RAND);
$decrypted = mcrypt_decrypt(MCRYPT_TRIPLEDES, $key, base64_encode($data), MCRYPT_MODE_ECB, $mcrypt_iv);
mcrypt_module_close($mcrypt_module);
return pkcs5_unpad($decrypted);
}
function pkcs5_unpad($text) {
$pad = ord($text{strlen($text)-1});
if ($pad > strlen($text)) return false;
if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
return substr($text, 0, -1 * $pad);
}
给定以下输入参数,PHP 无法提供相同的输出:
$key = 'ASDFasdf12348983jklasdfJ2Jaf8';
$encrypted_data = 'cPap7+JIPS4=';
应该解密为:
coRef=3
Java测试代码如下:
try {
String encryptedStr = encrypted_data; // same value as PHP's $encrypted_data
String decryptedString = "";
ThreeDES desedeEncrypter = new ThreeDES("DSEede", key); // same value as PHP's $key
decryptedString = desedeEncrypter.decrypt(encryptedStr);
System.out.println(decryptedString);
} catch (ThreeDES.EncryptionException e) {
e.printStackTrace();
}
输出:coRef=3
。但是,以下 PHP 代码会发出有关 key 长度的警告。
echo decrypt($key, $encrypted_data);
Key of size 29 not supported by this algorithm. Only keys of size 24 supported in...
如何修改代码以使用长度超过 24 个字符的 key ?
最佳答案
嗯,这很奇怪,
Triple Des只接受 24 个字节作为关键
Each DES key is nominally stored or transmitted as 8 bytes, each of odd parity,[12] so a key bundle requires 24 bytes for option 1, 16 for option 2, or 8 for option 3.
所以我认为问题出在 here
DESedeKeySpec
对象:
/**
* Uses the first 24 bytes in <code>key</code> as the DES-EDE key.
* <p>
* The bytes that constitute the DES-EDE key are those between
* <code>key[0]</code> and <code>key[23]</code> inclusive
*
* @param key the buffer with the DES-EDE key material.
* @exception InvalidKeyException if the given key material is shorter
* than 24 bytes.
*/
所以我认为 DESedeKeySpec
是将您的 29 长度 key 修剪为 24 以适应 tribledes
要求。
编辑另一个重要说明是mcrypt_*扩展已被弃用。
This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
关于java - PHP 上的 DESede 长 key ,而不是 Java 中的,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42642937/