des密码java版本

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1、代码：主函数所在类：packagening.hao;importjava.io.FileNotFoundException;importjava.io.UnsupportedEncodingException;publicclassApplication{publicstaticvoidmain(Stringargs[])throwsUnsupportedEncodingException{Skey_DESk_DES=newSkey_DES();//getkeyk_DES.getKey();SEncen=newSEnc();en.getPlainTex

2、t();en.displayPlaintext();en.encryptionAndStoreToFile();en.displayCrytionText();try{SDecde=newSDec();de.displayPlaintext();}catch(FileNotFoundExceptione){}}}其他类：（1）packagening.hao;importjava.io.*;importjavax.crypto.*;importjavax.crypto.spec.SecretKeySpec;publicclassSDec{FileInpu

3、tStreamf;intnum;intnum1;byte[]cText;FileInputStreamf2;byte[]keykb;byte[]pText;SecretKeySpeck;Ciphercp;ObjectInputStreamoI;SDec()throwsFileNotFoundException{try{f=newFileInputStream("SEnc.dat");//readfromfileSEnc.datnum=f.available();cText=newbyte[num];f.read(cText);//readincText

4、f2=newFileInputStream("key1.dat");oI=newObjectInputStream(f2);//num1=f2.available();//keykb=newbyte[num1];k=(SecretKeySpec)oI.readObject();//强制类型转换//k=newSecretKeySpec(keykb,"DESede");//密钥空间cp=Cipher.getInstance("DESede");cp.init(Cipher.DECRYPT_MODE,k);pText=cp.doFinal(cText);}c

5、atch(Exceptione){}}voiddisplayPlaintext()throwsUnsupportedEncodingException{Stringp=newString(pText);System.out.println("aferencryption:");System.out.println(p);}}（2）packagening.hao;importjava.io.*;importjava.security.Key;importjava.util.Scanner;importjavax.crypto.*;publicclassS

6、Enc{Strings;FileInputStreamf;ObjectInputStreamb;Ciphercp;Keyk;byte[]pText;//storeplainTextbyte[]cText;SEnc(){try{s=newString();f=newFileInputStream("key1.dat");b=newObjectInputStream(f);k=(Key)b.readObject();cp=Cipher.getInstance("DESede");//initializeCipherobjectcp.init(Cipher.

7、ENCRYPT_MODE,k);//setencryptionmode}catch(Exceptione){e.printStackTrace();System.out.println("ERROR");}}voidgetPlainText()throwsUnsupportedEncodingException{System.out.println("EnteraplainText,stopendswith#");Scannersc=newScanner(System.in);while(!s.endsWith("#")){s=sc.next();}p

8、Text=s.getBytes("UTF8");}voiddisplayPlaintext()