请教一个难题,DES如何加密和解密字符串.. 有标准算法,应该就是MAC运算 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 哪么请教具体应该怎样做啊,我主要是用于加密URL地址的参数.还有什么方法可以实现这个加密呢??要可解密的~ import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;public class Encrypt { public Encrypt() { } public byte[] getKey() throws Exception { return "[B@170888e".getBytes(); } public byte[] encryptData(String encryptdata) throws Exception { SecureRandom sr = new SecureRandom(); byte[] rawKeyData = getKey(); DESKeySpec dks = new DESKeySpec(rawKeyData); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey key = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, key, sr); byte[] data = encryptdata.getBytes(); byte[] encryptedData = cipher.doFinal(data); return encryptedData; } public String decryptData(byte[] decryptdata) throws Exception { SecureRandom sr = new SecureRandom(); byte[] rawKeyData = getKey(); DESKeySpec dks = new DESKeySpec(rawKeyData); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey key = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, key, sr); byte[] encryptedData = decryptdata; byte[] decryptedData = cipher.doFinal(encryptedData); return new String(decryptedData); } public static void main(String[] args) { try { Encrypt encrypt = new Encrypt(); String enpasswd = encrypt.encryptData("111111"); String depasswd = encrypt.decryptData( enpasswd ); } catch (Exception e) { e.printStackTrace(); } }} import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;/** * * 使用DES加密与解密,可对byte[],String类型进行加密与解密 * 密文可使用String,byte[]存储. * * 方法: * void getKey(String strKey)从strKey的字条生成一个Key * * String getEncString(String strMing)对strMing进行加密,返回String密文 * String getDesString(String strMi)对strMin进行解密,返回String明文 * *byte[] getEncCode(byte[] byteS)byte[]型的加密 *byte[] getDesCode(byte[] byteD)byte[]型的解密 */public class DesEncrypt { Key key; /** * 根据参数生成KEY * @param strKey */ public void getKey(String strKey) { try { KeyGenerator _generator = KeyGenerator.getInstance("DES"); _generator.init(new SecureRandom(strKey.getBytes())); this.key = _generator.generateKey(); _generator = null; } catch (Exception e) { e.printStackTrace(); } } /** * 加密String明文输入,String密文输出 * @param strMing * @return */ public String getEncString(String strMing) { byte[] byteMi = null; byte[] byteMing = null; String strMi = ""; BASE64Encoder base64en = new BASE64Encoder(); try { byteMing = strMing.getBytes("UTF8"); byteMi = this.getEncCode(byteMing); strMi = base64en.encode(byteMi); } catch (Exception e) { e.printStackTrace(); } finally { base64en = null; byteMing = null; byteMi = null; } return strMi; } /** * 解密 以String密文输入,String明文输出 * @param strMi * @return */ public String getDesString(String strMi) { BASE64Decoder base64De = new BASE64Decoder(); byte[] byteMing = null; byte[] byteMi = null; String strMing = ""; try { byteMi = base64De.decodeBuffer(strMi); byteMing = this.getDesCode(byteMi); strMing = new String(byteMing, "UTF8"); } catch (Exception e) { e.printStackTrace(); } finally { base64De = null; byteMing = null; byteMi = null; } return strMing; } /** * 加密以byte[]明文输入,byte[]密文输出 * @param byteS * @return */ private byte[] getEncCode(byte[] byteS) { byte[] byteFina = null; Cipher cipher; try { cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, key); byteFina = cipher.doFinal(byteS); } catch (Exception e) { e.printStackTrace(); } finally { cipher = null; } return byteFina; } /** * 解密以byte[]密文输入,以byte[]明文输出 * @param byteD * @return */ private byte[] getDesCode(byte[] byteD) { Cipher cipher; byte[] byteFina = null; try { cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, key); byteFina = cipher.doFinal(byteD); } catch (Exception e) { e.printStackTrace(); } finally { cipher = null; } return byteFina; } public static void main(String args[]) { DesEncrypt des=new DesEncrypt();//实例化一个对像 des.getKey("aadd");//生成密匙 String strEnc = des.getEncString("明文");//加密字符串,返回String的密文 System.out.println("加密文:"+strEnc); String strDes = des.getDesString(strEnc);//把String 类型的密文解密 System.out.println("解密文:"+strDes); }} 电子商务交易完成后问题 throw new Exception("xxxxx")的问题 sql优化问题 关于Struts中配置DBCP数据库连接池的问题 有人做过联通的短消息的WEB SERVices吗,给个例子好不 初涉J2EE C3P0连接池的问题 java学习struts2时候在for循环里启动子线程执行耗时操作,然后就抛出索引越界了。贴出代码,求解脱啦 jb9中使用struts1.1的例子 ---------非常感谢! 运行j2ee程序出错(在先等待) tomcat下axis找不到引用的类 不知道把这些引用类放在哪里 才可以找到 联创软件java工程师笔试考什么东西?
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;public class Encrypt {
public Encrypt() {
}
public byte[] getKey() throws Exception {
return "[B@170888e".getBytes();
}
public byte[] encryptData(String encryptdata)
throws Exception {
SecureRandom sr = new SecureRandom();
byte[] rawKeyData = getKey(); DESKeySpec dks = new DESKeySpec(rawKeyData); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key, sr);
byte[] data = encryptdata.getBytes();
byte[] encryptedData = cipher.doFinal(data); return encryptedData;
} public String decryptData(byte[] decryptdata)
throws Exception { SecureRandom sr = new SecureRandom(); byte[] rawKeyData = getKey();
DESKeySpec dks = new DESKeySpec(rawKeyData); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key, sr); byte[] encryptedData = decryptdata;
byte[] decryptedData = cipher.doFinal(encryptedData);
return new String(decryptedData);
}
public static void main(String[] args) {
try {
Encrypt encrypt = new Encrypt();
String enpasswd = encrypt.encryptData("111111");
String depasswd = encrypt.decryptData( enpasswd ); } catch (Exception e) {
e.printStackTrace();
}
}
}
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;/**
*
* 使用DES加密与解密,可对byte[],String类型进行加密与解密
* 密文可使用String,byte[]存储.
*
* 方法:
* void getKey(String strKey)从strKey的字条生成一个Key
*
* String getEncString(String strMing)对strMing进行加密,返回String密文
* String getDesString(String strMi)对strMin进行解密,返回String明文
*
*byte[] getEncCode(byte[] byteS)byte[]型的加密
*byte[] getDesCode(byte[] byteD)byte[]型的解密
*/public class DesEncrypt {
Key key; /**
* 根据参数生成KEY
* @param strKey
*/
public void getKey(String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
e.printStackTrace();
}
} /**
* 加密String明文输入,String密文输出
* @param strMing
* @return
*/
public String getEncString(String strMing) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
BASE64Encoder base64en = new BASE64Encoder();
try {
byteMing = strMing.getBytes("UTF8");
byteMi = this.getEncCode(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
base64en = null;
byteMing = null;
byteMi = null;
}
return strMi;
} /**
* 解密 以String密文输入,String明文输出
* @param strMi
* @return
*/
public String getDesString(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = this.getDesCode(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
e.printStackTrace();
} finally {
base64De = null;
byteMing = null;
byteMi = null;
}
return strMing;
} /**
* 加密以byte[]明文输入,byte[]密文输出
* @param byteS
* @return
*/
private byte[] getEncCode(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
} /**
* 解密以byte[]密文输入,以byte[]明文输出
* @param byteD
* @return
*/
private byte[] getDesCode(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
} public static void main(String args[]) {
DesEncrypt des=new DesEncrypt();//实例化一个对像
des.getKey("aadd");//生成密匙 String strEnc = des.getEncString("明文");//加密字符串,返回String的密文
System.out.println("加密文:"+strEnc); String strDes = des.getDesString(strEnc);//把String 类型的密文解密
System.out.println("解密文:"+strDes);
}
}