java 字母移位加密

【可加密，也可解密（-key）】

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public class Wangyf {

public static void main(String[] args) {

String str = "i am student zzzZZZ";

//加密

String str2 = getString( str, 1 );

System.out.println(str2);

//解密 用 -KEY

System.out.println(getString( str2, -1));

}

private static final char C1 = 'a';

private static final char C2 = 'z';

private static final char C3 = 'A';

private static final char C4 = 'Z';

public static String getString(String str, int key) {

key %= 26;

if(key == 0 ){

return str;

}

char[] chars = str.toCharArray();

for(int i = chars.length - 1 ; i = 0 ; i --){

if(chars[i] = C3 chars[i] = C4){

chars[i] += key;

if(chars[i] C4){

chars[i] = (char) ( chars[i] -C4 + C3 - 1);

}else if(chars[i] C3){

chars[i] = (char) (C4 - (C3 -chars[i]) + 1);

}

} else if(chars[i] = C1 chars[i] = C2){

chars[i] += key;

if(chars[i] C2){

chars[i] = (char) ( chars[i] - C2 + C1 - 1);

}else if(chars[i] C1){

chars[i] = (char) (C2 - (C1 - chars[i]) + 1);

}

}

}

return new String( chars );

}

}

【測(cè)試結(jié)果】

j bn tuvefou aaaAAA

i am student zzzZZZ

給個(gè)列變位加解密算法的實(shí)現(xiàn)程序（JAVA、C++、C都可以）

cpp代碼如下

#include?iostream

using?namespace?std;

string?encode(const?string?input,?size_t?key)?{

string?result;

size_t?size?=?input.size();

for?(size_t?col?=?0;?col??key;?++col)

for?(size_t?cur?=?col;?cur??size;?cur?+=?key)

result?+=?input[cur];

return?result;

}

string?decode(const?string?input,?size_t?key)?{

size_t?size?=?input.size();

string?result('?',?size);

for?(size_t?off?=?0,?pos?=?0,?col?=?0;?off??size;?++off,?pos?+=?key)?{

if?(pos?=?size)

pos?=?++col;

result[pos]?=?input[off];

}

return?result;

}

int?main()?{

string?orig?=?"abcdefghijklmnopqrstuvwxyz";

size_t?key?=?7;

string?encoded?=?encode(orig,?key);

string?decoded?=?decode(encoded,?key);

cout??"orig:?"??orig??endl;

cout??"enc:??"??encoded??endl;

cout??"dec:??"??decoded??endl;

return?0;

}

java加密解密代碼

package com.cube.limail.util;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;/**

* 加密解密類

*/

public class Eryptogram

{

private static String Algorithm ="DES";

private String key="CB7A92E3D3491964";

//定義 加密算法,可用 DES,DESede,Blowfish

static boolean debug = false ;

/**

* 構(gòu)造子注解.

*/

public Eryptogram ()

{

} /**

* 生成密鑰

* @return byte[] 返回生成的密鑰

* @throws exception 扔出異常.

*/

public static byte [] getSecretKey () throws Exception

{

KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );

SecretKey deskey = keygen.generateKey ();

System.out.println ("生成密鑰:"+bytesToHexString (deskey.getEncoded ()));

if (debug ) System.out.println ("生成密鑰:"+bytesToHexString (deskey.getEncoded ()));

return deskey.getEncoded ();

} /**

* 將指定的數(shù)據(jù)根據(jù)提供的密鑰進(jìn)行加密

* @param input 需要加密的數(shù)據(jù)

* @param key 密鑰

* @return byte[] 加密后的數(shù)據(jù)

* @throws Exception

*/

public static byte [] encryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug )

{

System.out.println ("加密前的二進(jìn)串:"+byte2hex (input ));

System.out.println ("加密前的字符串:"+new String (input ));

} Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.ENCRYPT_MODE ,deskey );

byte [] cipherByte =c1.doFinal (input );

if (debug ) System.out.println ("加密后的二進(jìn)串:"+byte2hex (cipherByte ));

return cipherByte ;

} /**

* 將給定的已加密的數(shù)據(jù)通過指定的密鑰進(jìn)行解密

* @param input 待解密的數(shù)據(jù)

* @param key 密鑰

* @return byte[] 解密后的數(shù)據(jù)

* @throws Exception

*/

public static byte [] decryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug ) System.out.println ("解密前的信息:"+byte2hex (input ));

Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.DECRYPT_MODE ,deskey );

byte [] clearByte =c1.doFinal (input );

if (debug )

{

System.out.println ("解密后的二進(jìn)串:"+byte2hex (clearByte ));

System.out.println ("解密后的字符串:"+(new String (clearByte )));

} return clearByte ;

} /**

* 字節(jié)碼轉(zhuǎn)換成16進(jìn)制字符串

* @param byte[] b 輸入要轉(zhuǎn)換的字節(jié)碼

* @return String 返回轉(zhuǎn)換后的16進(jìn)制字符串

*/

public static String byte2hex (byte [] b )

{

String hs ="";

String stmp ="";

for (int n =0 ;n b.length ;n ++)

{

stmp =(java.lang.Integer.toHexString (b [n ] 0XFF ));

if (stmp.length ()==1 ) hs =hs +"0"+stmp ;

else hs =hs +stmp ;

if (n b.length -1 ) hs =hs +":";

} return hs.toUpperCase ();

}

/**

* 字符串轉(zhuǎn)成字節(jié)數(shù)組.

* @param hex 要轉(zhuǎn)化的字符串.

* @return byte[] 返回轉(zhuǎn)化后的字符串.

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i len; i++) {

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/**

* 字節(jié)數(shù)組轉(zhuǎn)成字符串.

* @param String 要轉(zhuǎn)化的字符串.

* @return 返回轉(zhuǎn)化后的字節(jié)數(shù)組.

*/

public static final String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i bArray.length; i++) {

sTemp = Integer.toHexString(0xFF bArray[i]);

if (sTemp.length() 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/**

* 從數(shù)據(jù)庫(kù)中獲取密鑰.

* @param deptid 企業(yè)id.

* @return 要返回的字節(jié)數(shù)組.

* @throws Exception 可能拋出的異常.

*/

public static byte[] getSecretKey(long deptid) throws Exception {

byte[] key=null;

String value=null;

//CommDao dao=new CommDao();

// List list=dao.getRecordList("from Key k where k.deptid="+deptid);

//if(list.size()0){

//value=((com.csc.sale.bean.Key)list.get(0)).getKey();

value = "CB7A92E3D3491964";

key=hexStringToByte(value);

//}

if (debug)

System.out.println("密鑰:" + value);

return key;

}

public String encryptData2(String data) {

String en = null;

try {

byte[] key=hexStringToByte(this.key);

en = bytesToHexString(encryptData(data.getBytes(),key));

} catch (Exception e) {

e.printStackTrace();

}

return en;

}

public String decryptData2(String data) {

String de = null;

try {

byte[] key=hexStringToByte(this.key);

de = new String(decryptData(hexStringToByte(data),key));

} catch (Exception e) {

e.printStackTrace();

}

return de;

}

} 加密使用： byte[] key=Eryptogram.getSecretKey(deptid); //獲得鑰匙（字節(jié)數(shù)組）

byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //傳入密碼和鑰匙，獲得加密后的字節(jié)數(shù)組的密碼

password=Eryptogram.bytesToHexString(tmp); //將字節(jié)數(shù)組轉(zhuǎn)化為字符串，獲得加密后的字符串密碼解密與之差不多

網(wǎng)站題目：移位解密算法java代碼,移位解密算法java代碼是多少
文章起源：http://chinadenli.net/article2/dsgsgoc.html

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