import?java.io.InputStream;
import?java.io.OutputStream;
import?java.security.spec.AlgorithmParameterSpec;
import?javax.crypto.Cipher;
import?javax.crypto.CipherInputStream;
import?javax.crypto.CipherOutputStream;
import?javax.crypto.SecretKey;
import?javax.crypto.spec.IvParameterSpec;

class?DesEncrypter?{
??byte[]?buf?=?new?byte[1024];
??Cipher?ecipher;
??Cipher?dcipher;
??DesEncrypter（SecretKey?key）?throws?Exception{
????byte[]?iv?=?new?byte[]?{?（byte）?0x8E?0x12?0x39?（byte）?0x9C?0x07?0x72?0x6F?0x5A?};
????AlgorithmParameterSpec?paramSpec?=?new?IvParameterSpec（iv）;
????ecipher?=?Cipher.getInstance（“DES/CBC/PKCS5Padding“）;
????dcipher?=?Cipher.getInstance（“DES/CBC/PKCS5Padding“）;

????ecipher.init（Cipher.ENCRYPT_MODE?key?paramSpec）;
????dcipher.init（Cipher.DECRYPT_MODE?key?paramSpec）;
??}


??public?void?encrypt（InputStream?in?OutputStream?out）??throws?Exception{
????out?=?new?CipherOutputStream（out?ecipher）;

????int?numRead?=?0;
????while?（（numRead?=?in.read（buf））?>=?0）?{
??????out.write（buf?0?numRead）;
????}
????out.close（）;
??}

??public?void?decrypt（InputStream?in?OutputStream?out）??throws?Exception{
????in?=?new?CipherInputStream（in?dcipher）;

????int?numRead?=?0;
????while?（（numRead?=?in.read（buf））?>=?0）?{
??????out.write（buf?0?numRead）;
????}
????out.close（）;
??}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????9585??2013-05-22?16:06??PEKSClient.java
?????文件????????2213??2013-05-22?09:13??PEKSInitial.java
?????文件???????10156??2013-05-22?09:34??PEKSServer.java
?????文件?????????371??2013-05-04?23:05??Trapdoor.java
?????文件????????1362??2013-05-03?00:08??DesEncrypter.java