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   <H1>[pycrypto] Ask help for java2python rewrite for AES decrypto</H1>
    <B>Joel Edwards</B> 
    <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Ask%20help%20for%20java2python%20rewrite%20for%20AES%20decrypto&In-Reply-To=%3C8287917590106489675%40unknownmsgid%3E"
       TITLE="[pycrypto] Ask help for java2python rewrite for AES decrypto">joeledwards at gmail.com
       </A><BR>
    <I>Fri Dec 28 04:16:42 PST 2012</I>
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<PRE>There is a good implementation available on the AES Crypt website.

Java version overview
<A HREF="http://www.aescrypt.com/java_aes_crypt.html">http://www.aescrypt.com/java_aes_crypt.html</A>

Download page
<A HREF="https://www.aescrypt.com/download/">https://www.aescrypt.com/download/</A>

A lot of the code is designed around AES Crypt's file format, but as long
as you evaluate that first, you should be able to get a good idea of how to
set things up correctly.

Keep in mind that only 128-bit encryption is available with the standard
Java lib, and AES Crypt is written for 256-bit encryption. So you will need
to either adapt their work to a 128-bit key size, or (assuming no
restrictions apply) download the &quot;Java Cryptography Extension (JCE)
Unlimited Strength Jurisdiction Policy Files&quot; from
Oracle&lt;<A HREF="http://www.oracle.com/technetwork/java/javase/downloads/index.html">http://www.oracle.com/technetwork/java/javase/downloads/index.html</A>&gt;
.

Let me know if you have additional questions. You may contact me directly
if you wish, seeing as this is a pycrypto group.

Joel (Via Mobile)

On Dec 28, 2012, at 2:16, &quot;steve.yi&quot; &lt;<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">steve.yi at 139.com</A>&gt; wrote:


Hi Pycryptors,

I got some requests from my clients, his requests are xml formatted
encrypted by AES with Java.

I decide to use pycrypto to decrypt these xml requests. But i am not
familiar with Java.

Someone can help? Thanks a lot. Java codes as follows,


Encrypt.java
============


import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Encrypt {
public password = &quot;123456&quot;;
    public Encrypt(String password) {
super();
this.password = password;
}
/**
     * &#21152;&#23494;
     *
     * @param content &#38656;&#35201;&#21152;&#23494;&#30340;&#20869;&#23481;
     * @param password  &#21152;&#23494;&#23494;&#30721;
     * @return
     */
    public static byte[] encrypt(String content, String password) {
            try {

                    KeyGenerator kgen = KeyGenerator.getInstance(&quot;AES&quot;);
//AES&#23494;&#38053;&#29983;&#25104;&#22120;
                    //128&#26159;&#23494;&#38053;&#30340;&#38271;&#24230;  SecureRandom&#26159;&#38543;&#26426;&#29983;&#25104;&#25968;  &#20294;&#26159;&#25105;&#20204;&#38656;&#35201;&#25668;&#20837;&#30830;&#23450;&#30340;&#20540;
                    kgen.init(128, new
SecureRandom(password.getBytes()));//&#21021;&#22987;&#21270;&#23494;&#38053;
                    SecretKey secretKey = kgen.generateKey();
//&#20998;&#32452;&#31192;&#23494;&#23494;&#38053;&#65288;&#24182;&#20026;&#20854;&#25552;&#20379;&#31867;&#22411;&#23433;&#20840;&#65289;
                    byte[] enCodeFormat = secretKey.getEncoded();
                    SecretKeySpec key = new SecretKeySpec(enCodeFormat,
&quot;AES&quot;); //&#23545;&#20135;&#29983;&#30340;&#23494;&#38053;&#20877;&#36827;&#34892;&#23553;&#35013;
                    Cipher cipher = Cipher.getInstance(&quot;AES&quot;);// &#21019;&#24314;&#23494;&#30721;&#22120;
                    byte[] byteContent = content.getBytes(&quot;utf-8&quot;);
 //&#33719;&#24471;&#21407;&#25991;utf-8&#32534;&#30721;&#26684;&#24335;&#30340;&#23383;&#33410;&#25968;
                    cipher.init(Cipher.ENCRYPT_MODE, key);// &#21152;&#23494;&#21021;&#22987;&#21270;
Cipher.ENCRYPT_MODE&#20026;&#21152;&#23494;
                    byte[] result = cipher.doFinal(byteContent);  //&#23494;&#30721;&#22120;&#25191;&#34892;&#21152;&#23494;
&#24182;&#29983;&#25104;&#21152;&#23494;&#23383;&#33410;&#25968;&#32452;
                    return result; // &#21152;&#23494;
            } catch (Exception e) {
                    e.printStackTrace();
            }
            return null;
    }
    /**&#35299;&#23494;
     * @param content  &#24453;&#35299;&#23494;&#20869;&#23481;
     * @param password &#35299;&#23494;&#23494;&#38053;
     * @return
     */
    public static String decrypt(byte[] content, String password) {
            try {
                     KeyGenerator kgen = KeyGenerator.getInstance(&quot;AES&quot;);
 //AES&#23494;&#38053;&#29983;&#25104;&#22120;
                     //128&#26159;&#23494;&#38053;&#30340;&#38271;&#24230;  SecureRandom&#26159;&#38543;&#26426;&#29983;&#25104;&#25968;  &#20294;&#26159;&#25105;&#20204;&#38656;&#35201;&#25668;&#20837;&#30830;&#23450;&#30340;&#20540;
                     kgen.init(128, new SecureRandom(password.getBytes()));
 //&#21021;&#22987;&#21270;&#23494;&#38053;
                     SecretKey secretKey = kgen.generateKey();
 //&#20998;&#32452;&#31192;&#23494;&#23494;&#38053;&#65288;&#24182;&#20026;&#20854;&#25552;&#20379;&#31867;&#22411;&#23433;&#20840;&#65289;
                     byte[] enCodeFormat = secretKey.getEncoded();
                     SecretKeySpec key = new SecretKeySpec(enCodeFormat,
&quot;AES&quot;);  //&#23545;&#20135;&#29983;&#30340;&#23494;&#38053;&#20877;&#36827;&#34892;&#23553;&#35013;
                     Cipher cipher = Cipher.getInstance(&quot;AES&quot;);// &#21019;&#24314;&#23494;&#30721;&#22120;
                    cipher.init(Cipher.DECRYPT_MODE, key);// &#35299;&#23494;&#21021;&#22987;&#21270;
Cipher.DECRYPT_MODE&#20026;&#35299;&#23494;
                    byte[] result = cipher.doFinal(content);  //&#23494;&#30721;&#22120;&#25191;&#34892;&#35299;&#23494;&#23494;
&#24182;&#29983;&#25104;&#35299;&#23494;&#23494;&#23383;&#33410;&#25968;&#32452;
                    return new String(result); // &#35299;&#23494;
            } catch (Exception e) {
                    e.printStackTrace();
            }
            return null;
    }


    public static String parseByte2HexStr(byte buf[]){
    StringBuffer sb=new StringBuffer();
    for(int i=0;i&lt;buf.length;i++){
    String hex=Integer.toHexString(buf[i]&amp;0xFF);
    if(hex.length()==1){
    hex='0' + hex;
    }
    sb.append(hex.toUpperCase());
    }
    return sb.toString();
    }


    public static byte[] parseHexStr2Byte(String hexStr){
    if(hexStr.length()&lt;1)
    return null;
    byte[]result=new byte[hexStr.length()/2];
    for(int i=0;i&lt;hexStr.length()/2;i++){
    int high=Integer.parseInt(hexStr.substring(i*2,i*2+1),16);
    int low=Integer.parseInt(hexStr.substring(i*2+1,i*2+2),16);
    result[i]=(byte)(high*16+low);
    }
    return result;
    }

    public static void main(String args[]) throws
UnsupportedEncodingException {
    String content = &quot;&lt;?xml version=\&quot;1.0\&quot; encoding=\&quot;UTF-8\&quot;?&gt;&quot;+
    &quot;&lt;request&gt;&quot;+
      &quot;&lt;company&gt;1&lt;/company&gt;&quot;+
    &quot;&lt;requestId&gt;2&lt;/requestId&gt;&quot;+
    &quot;&lt;Create&gt;&quot;+
    &quot;&lt;CreateHost&gt;&quot;+
    &quot;&lt;userId&gt;3&lt;/userId&gt;&quot;+
    &quot;&lt;transactionId&gt;4&lt;/transactionId&gt;&quot;+
    &quot;&lt;timestamp&gt;5&lt;/timestamp&gt;&quot;+
    &quot;&lt;core&gt;6&lt;/core&gt;&quot;+
    &quot;&lt;memory&gt;7&lt;/memory&gt;&quot;+
    &quot;&lt;os&gt;4&lt;/os&gt;&quot;+
    &quot;&lt;groupName&gt;5&lt;/groupName&gt;&quot;+
    &quot;&lt;hostSpecId&gt;5&lt;/hostSpecId&gt;&quot;+
    &quot;&lt;path&gt;6&lt;/path&gt;&quot;+
    &quot;&lt;/CreateHost&gt;&quot;+
    &quot;&lt;CreateIp&gt;&quot;+
    &quot;&lt;transactionId&gt;6&lt;/transactionId&gt;&quot;+
    &quot;&lt;netSpeed&gt;6&lt;/netSpeed&gt;&quot;+
    &quot;&lt;ip&gt;7&lt;/ip&gt;&quot;+
    &quot;&lt;/CreateIp &gt;&quot;+
    &quot;&lt;CreateDisk&gt;&quot;+
    &quot;&lt;transactionId&gt;7&lt;/transactionId&gt;&quot;+
    &quot;&lt;disk&gt;7&lt;/disk&gt;&quot;+
    &quot;&lt;/CreateDisk&gt;&quot;+
    &quot;&lt;/Create&gt;&quot;+
    &quot;&lt;/request&gt;&quot;;
    System.out.println(&quot;content:&quot;+content);
     System.out.println(&quot;encrypted:&quot;+(parseByte2HexStr(Encrypt.encrypt(content,
&quot;123456&quot;))));
     System.out.println(&quot;decrypted:&quot;+Encrypt.decrypt(parseHexStr2Byte(parseByte2HexStr(Encrypt.encrypt(content,
&quot;123456&quot;))),&quot;123456&quot;));
    }


}

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