使用phpseclib将Java rsa标志转换为php代码

Question

任何人都可以帮助我使用phpseclib从Java符号转换为php代码

public string SignData(string _data,string _priKey)
 {
 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048);
 rsa.FromXmlString(_priKey);
 UnicodeEncoding ByteConverter = new UnicodeEncoding();
 byte[] dataToEncrypt = ByteConverter.GetBytes(_data);
 byte[] signature = rsa.SignData(dataToEncrypt,'sha256');
 string result = Convert.ToBase64String(signature);
 return result;
 }

我正在使用它，但是（在laravel中）不起作用

use phpseclib\Crypt\RSA;

$rsa = new RSA();
$rsa->setHash('sha256');
$rsa->setSignatureMode(2);
$privateXmlKey = '<RSAKeyValue><Modulus></Modulus><Exponent>AQAB</Exponent><P></P><Q></Q><DP></DP><DQ></DQ><InverseQ></InverseQ><D></D></RSAKeyValue>';
$rsa->loadKey($privateXmlKey, 2);
$text = 'sample data';
$plainText = mb_convert_encoding($text, 'UTF-16');
$sign = $rsa->sign($plainText);
$sign = base64_encode($sign);

我尝试了两种签名模式：CRYPT_RSA_SIGNATURE_PKCS1和CRYPT_RSA_SIGNATURE_PSS

非常感谢