DES加密解密
上面是加密，下面是解密加密正常，解密有错误，求大神指导
public void SEnc(String str) throws Exception
{
FileInputStream f=new FileInputStream("D:/key.dat");
int num = f.available();
byte[] keybyte = new byte[num];
f.read(keybyte);
SecretKey kk = new SecretKeySpec(keybyte,"DESede");
Cipher cp = Cipher.getInstance("DESede");
cp.init(Cipher.ENCRYPT_MODE,kk);
byte ptext[] = str.getBytes("UTF8");
ctext = cp.doFinal(ptext);
}
public void SDec(byte B1[]) throws Exception--------------------编程问答-------------------- 楼主可以参考下别人的代码。
{
FileInputStream f = new FileInputStream("D:/key.dat");
int num = f.available();
byte[] keybyte = new byte[num];
f.read(keybyte);
SecretKey kk = new SecretKeySpec(keybyte,"DESede");
Cipher cp;
cp = Cipher.getInstance("DESede");
cp.init(Cipher.DECRYPT_MODE, kk);
byte []ptext = cp.doFinal(B1);
String str = new String(ptext,"UTF8");
p = str;
}
也是DES的加解密。。。
http://www.oschina.net/code/snippet_727646_18383 --------------------编程问答-------------------- 贴个参考下
--------------------编程问答-------------------- 希望能帮到楼主
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
/**
* @author cross
*/
public class DesUtils {
private static String strDefaultKey = "quhao";
private Cipher encryptCipher = null;
private Cipher decryptCipher = null;
public static String byteArr2HexStr(byte[] arrB) {
int iLen = arrB.length;
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
while (intTmp < 0) {
intTmp = intTmp + 256;
}
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
public static byte[] hexStr2ByteArr(String strIn) {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
public DesUtils() {
this(strDefaultKey);
}
public DesUtils(String strKey) {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey.getBytes());
try {
encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}
}
public byte[] encrypt(byte[] arrB) throws IllegalBlockSizeException, BadPaddingException {
return encryptCipher.doFinal(arrB);
}
public String encrypt(String strIn) {
try {
return byteArr2HexStr(encrypt(strIn.getBytes()));
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
return null;
} catch (BadPaddingException e) {
e.printStackTrace();
return null;
}
}
public byte[] decrypt(byte[] arrB) throws IllegalBlockSizeException, BadPaddingException {
return decryptCipher.doFinal(arrB);
}
public String decrypt(String strIn) {
try {
return new String(decrypt(hexStr2ByteArr(strIn)));
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
return null;
} catch (BadPaddingException e) {
e.printStackTrace();
return null;
}
}
private Key getKey(byte[] arrBTmp) {
byte[] arrB = new byte[8];
for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
}
package Encrypt;--------------------编程问答-------------------- 哇靠，一个比一个牛 --------------------编程问答-------------------- http://www.cppblog.com/biao/archive/2013/06/27/201337.html
import java.security.*;
import javax.crypto.*;
import sun.misc.*;
/**
* 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 Encrypt{
private Key key;
private byte[] byteMi = null;
private byte[] byteMing = null;
private String strMi= "";
private String strM= "";
// 根据参数生成KEY
public void setKey(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
public void setEncString(String strMing){
BASE64Encoder base64en = new BASE64Encoder();
try {
this.byteMing = strMing.getBytes("UTF8");
this.byteMi = this.getEncCode(this.byteMing);
this.strMi = base64en.encode(this.byteMi);
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
this.byteMing = null;
this.byteMi = null;
}
}
//加密以byte[]明文输入,byte[]密文输出
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String密文输入,String明文输出
public void setDesString(String strMi){
BASE64Decoder base64De = new BASE64Decoder();
try
{
this.byteMi = base64De.decodeBuffer(strMi);
this.byteMing = this.getDesCode(byteMi);
this.strM = new String(byteMing,"UTF8");
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
base64De = null;
byteMing = null;
byteMi = null;
}
}
// 解密以byte[]密文输入,以byte[]明文输出
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;
}
//返回加密后的密文strMi
public String getStrMi()
{
return strMi;
}
//返回解密后的明文
public String getStrM()
{
return strM;
}
}
*注意：因为我用的时候是作为后台的BEAN来调用的，所以没有写main函数，也就不能直接运行了。必须加一个main()函数才能做为一个完成的JAVA程序使用。一个很简单的 main()函数就ok了，不用我写在这里了吧？呵呵！
在WEB前台调用这个BEAN文件时的语句：
<jsp:useBean id="abc" scope="page" class="oaweb.Encrypt" />
//id="abc" 用来初始化一个对象
<%
//明文加密：
String key = “06”; //初始化密钥。
abc.setKey(key); //调用set函数设置密钥。
abc.setEncString(re[i][j]);//将要加密的明文传送给Encrypt.java进行加密计算。
String Mi=abc.getStrMi(); //调用get函数获取加密后密文。
%>
//变量Mi就是密文.
<%
//密文解密：
abc. setDesString(String Mi); //将要解密的密文传送给Encrypt.java进行解密计算。
String M=abc. String getStrM(); //调用get函数获取解密后明文。
%>
//变量M就是明文.
这里讲得很详细
补充：Java , Java EE
