Java Card

Hey,
I try to encrypt my Applet data with an RSA Public Key from my Server.
I use open ssl 3.0.7 and keys are generated like this
openssl genrsa -traditional -out "C:\test\traditional_private.txt" 1024
openssl rsa -traditional -in "C:\test\traditional_private.txt" -pubout -out "C:\test\opublic_traditional.txt"
------
this is my Applet code:
private void setPublicKeyValues(APDU apdu) {
byte[] buf = apdu.getBuffer();
// Check if Parameter P2 Contains supported request for Public Key
byte keyElement = (byte) (buf[ISO7816.OFFSET_P2] & 0xFF);

  if ((keyElement != 0x00) && (keyElement != 0x01))  
     ISOException.throwIt(ISO7816.SW\_INCORRECT\_P1P2);  
  else {  
     // keyElement = 0 is set for Modulus  
     if (keyElement == 0) {     
        short numBytes = apdu.setIncomingAndReceive();  

        transientByteBufferModulus = JCSystem.makeTransientByteArray(numBytes, JCSystem.CLEAR\_ON\_DESELECT);  

        Util.arrayCopy(buf, ISO7816.OFFSET\_CDATA, transientByteBufferModulus, (short) 0, numBytes);  
     }  
     // Set for exponent  
     else if (keyElement == 1) {  
        short numBytes = apdu.setIncomingAndReceive();  

        transientByteBufferExponent = JCSystem.makeTransientByteArray(numBytes, JCSystem.CLEAR\_ON\_DESELECT);  

        Util.arrayCopy(buf, ISO7816.OFFSET\_CDATA, transientByteBufferExponent, (short) 0, numBytes);  
     }  
  }  

}

private void buildPublicKey(APDU apdu) {
// Create one key instance;
//ALG_RSA_CRT
rsa_PublicKey = (RSAPublicKey) KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC, KeyBuilder.LENGTH_RSA_1024,
false);
// Set key value with key value bytes: rsa public key N;
rsa_PublicKey.setModulus(transientByteBufferModulus, (short) 0, (short) transientByteBufferModulus.length);
// Set key value with key value bytes: rsa public key E;
rsa_PublicKey.setExponent(transientByteBufferExponent, (short) 0, (short) transientByteBufferExponent.length);
// You can use the key now ...

Cipher rsaCipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);

  rsaCipher.init(rsa\_PublicKey, Cipher.MODE\_ENCRYPT);  


  byte\[\] buffer = apdu.getBuffer();  

  short len = apdu.setIncomingAndReceive();  

  try {  
     short outlen = rsaCipher.doFinal(pseudonym, (short) 0, (short) pseudonym.length, buffer, (short) 0);  
     apdu.setOutgoingAndSend((short) 0, outlen);  
  } catch (CryptoException e) {  
     switch (e.getReason()) {  
     case CryptoException.UNINITIALIZED\_KEY:  
        ISOException.throwIt(SW\_UNINITIALIZED\_KEY);  
        return;  
     case CryptoException.INVALID\_INIT:  
        ISOException.throwIt(SW\_INVALID\_INIT);  
        return;  
     case CryptoException.ILLEGAL\_USE:  
        ISOException.throwIt(SW\_ILLEGAL\_USE);  
        return;  
     default:  
        ISOException.throwIt(ISO7816.SW\_COMMAND\_NOT\_ALLOWED);  
     }  
  }  

}
The Applet deliveres the data as an RPDU.
I convert the Hex data to Base64 with this online tool
Hex to Base64 | Base64 Encode | Base64 Converter | Base64 (0 Bytes)And decode the base 64 like this
openssl enc -d -base64 -in "C:\test\encrypted_testdata_as_base64.txt" -A -out "C:\test\encrypted_testdata.txt"
If I use this data to decrypt I get this error:

openssl pkeyutl -decrypt -inkey "C:\test\traditional_private.txt" -in "C:\test\encrypted_testdata.txt" -out "C:\test\testdata_encrypted_decrypted.txt"
Public Key operation error
48250000:error:0200009F:rsa routines:RSA_padding_check_PKCS1_type_2:pkcs decoding error:..\crypto\rsa\rsa_pk1.c:269:
48250000:error:02000072:rsa routines:rsa_ossl_private_decrypt:padding check failed:..\crypto\rsa\rsa_ossl.c:500:

does someone know where the padding is lost? what do I have to do to keep the padding?