RSA-Entschlüsselung Fehler - IllegalBlockSizeException: die Daten dürfen nicht länger als 128 Byte

Bin ich nun auf die Herstellung RSA message authentication software. Der Ablauf ist wie folgt:

1. Unterschreiben Sie die Nachricht mit Einem privaten Schlüssel (1024 bit)
2. Überprüfen Sie die Nachricht mit Einem öffentlichen Schlüssel (1024 bit)

Die #1 der code (unten) funktioniert einwandfrei und erzeugt Folgendes Ergebnis:

5554c9a9f6838b6cf40d9dbfbab3d90ea27aa6434ed095d289c13c2624617993ad99161ac265276d150510c176341d8ab8600d08b7353286d465e6bd3370a6fd8dd3ffb82916f612fd6dcee5e654ed801cfca6b6d2d5d6dc99ff7921b615abdf62eb67db1f71e6a6ea70012fd35e7cefa1a8d3aab7614c47746cfe1fc2bc875b

Aber die #2 code zeigt folgenden Fehler:

javax.crypto.IllegalBlockSizeException: Data must not be longer than 128 bytes

Ich denke, die Zeile in #1 Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
erzeugt 2048 bits (256 Byte) Ergebnis. Vielleicht ist das das problem... erinnere mich, dass ich mit 1024 bit private Schlüssel.

Also, wie können Sie die #1 code generieren 128-byte-Ergebnis?

1. SignMail.java

public class SignMail {

    static {
        Security.addProvider(new org.spongycastle.jce.provider.BouncyCastleProvider());
    }

    public static String sign(String userOriginalMessage) throws Exception {

        PEMReader userPrivateKey = new PEMReader(
          new InputStreamReader(
             new FileInputStream(Environment.getExternalStorageDirectory()+"/pkcs10priv.key")));

        KeyPair keyPair = (KeyPair)userPrivateKey.readObject();

        byte[] cipherText;
        //modified by JEON 20130817
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        //encrypt the message using private key
        cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPrivate());
        cipherText = cipher.doFinal(userOriginalMessage.getBytes());
        return new String(Hex.encode(cipherText));

    }


}

2. UserSMSVerifier.java

public class UserSMSVerifier {

static String signedMail;

static {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
}


public static String messageGenarator(
        String UserCert,
        String origninalMessage         
        ) throws Exception{

    InputStream userCertStream = new ByteArrayInputStream(UserCert.getBytes("UTF-8"));

    PEMReader userCerti = new PEMReader(
              new InputStreamReader(
                      userCertStream));



    //KeyPair userPrivate = (KeyPair)userPrivateKey.readObject();
    X509Certificate userCert = (X509Certificate)userCerti.readObject();


    byte[] dectyptedText = null;
    //decrypt the text using the private key
    //modified by JEON 20130817
    //Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.DECRYPT_MODE, userCert.getPublicKey());
    dectyptedText = cipher.doFinal(origninalMessage.getBytes());

    String result = new String(dectyptedText, Charset.forName("UTF-8"));
    return result;

}


}

#2 code ausgeführt wurde, indem Sie den folgenden JSP -

#3 messageVeri.JSP

<%@ page language="java" contentType="text/html; charset=euc-kr" %>

<%@ page session = "true" %>

<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.PreparedStatement" %>
<%@ page import="java.sql.Statement" %>
<%@ page import="java.sql.SQLException" %>
<%@ page import="java.sql.ResultSet" %>

<%@ page import="myPackage.UserSMSVerifier" %>


<%
    request.setCharacterEncoding("euc-kr");

    String userID = request.getParameter("sender");
    String encryptedSMS = request.getParameter("encryptedSMS");

    //String sql = "select user_id, user_pw from testca.testca_init where user_id=? and user_pw=?";
    //String sql = "update testca.testca_init set pkcs10request = '"+pkcs10request_new+"' where user_id='user1'";
    String sql = "select * from testca.testca_init where user_id='" + userID + "'";

    Class.forName("com.mysql.jdbc.Driver");

    Connection conn = null;
    PreparedStatement pstmt = null;

    Statement stmt = null;
    ResultSet rs = null;

    String jdbcDriver = "jdbc:mysql://localhost:3306/";
    String dbUser = "root";
    String dbPass = "fo.......t";


    try{
        conn = DriverManager.getConnection(jdbcDriver, dbUser, dbPass);
        stmt = conn.createStatement();
        //stmt.executeUpdate(sql);
        rs=stmt.executeQuery(sql);
        while(rs.next()){
        //rs=stmt.executeQuery(sql);
        String userCertificate=rs.getString("certificate");
        UserSMSVerifier.messageGenarator(userCertificate, encryptedSMS);
        }



    }catch(Exception ex){out.print("Error 2: " +ex);}
    /*
    if(rs.next())
    {
        //session.setAttribute("userID", userID);
        out.print("Insert Succeed!");
        out.println();
        //out.print("Welcome!" + " " + session.getAttribute("userID"));
    }
    else
    {
        out.print("failed to login!");
        //session.invalidate();
    }
    */

%>

InformationsquelleAutor user1349407 | 2013-08-16