java 兑现des加密
java 实现des加密！
DES.java
package Lion.Security.Cryptography;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
/**
* DES加密的，文件*有两个方法,加密、解密
* @author Lion
* @author www.lionsky.net
*/
public class DES {
private String Algorithm = "DES";
private KeyGenerator keygen;
private SecretKey deskey;
private Cipher c;
private byte[] cipherByte;
/**
* 初始化 DES 实例
*/
public DES() {
init();
}
public void init() {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
try {
keygen = KeyGenerator.getInstance(Algorithm);
deskey = keygen.generateKey();
c = Cipher.getInstance(Algorithm);
}
catch(NoSuchAlgorithmException ex){
ex.printStackTrace();
}
catch(NoSuchPaddingException ex){
ex.printStackTrace();
}
}
/**
* 对 String 进行加密
* @param str 要加密的数据
* @return 返回加密后的 byte 数组
*/
public byte[] createEncryptor(String str) {
try {
c.init(Cipher.ENCRYPT_MODE, deskey);
cipherByte = c.doFinal(str.getBytes());
}
catch(java.security.InvalidKeyException ex){
ex.printStackTrace();
}
catch(javax.crypto.BadPaddingException ex){
ex.printStackTrace();
}
catch(javax.crypto.IllegalBlockSizeException ex){
ex.printStackTrace();
}
return cipherByte;
}
/**
* 对 Byte 数组进行解密
* @param buff 要解密的数据
* @return 返回加密后的 String
*/
public String createDecryptor(byte[] buff) {
try {
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(buff);
}
catch(java.security.InvalidKeyException ex){
ex.printStackTrace();
}
catch(javax.crypto.BadPaddingException ex){
ex.printStackTrace();
}
catch(javax.crypto.IllegalBlockSizeException ex){
ex.printStackTrace();
}
return (new String(cipherByte));
}
}
DES.jsp
<%@ page c %>
<jsp:useBean id="DES" scope="page" class="Lion.Security.Cryptography.DES" />
<html>
<head><title>DES File</title></head>
<body bgcolor="#FFFFFF">
<div align="center"><center>
<%
String Test = request.getParameter("Test");
if(Test==null || Test.equals("")) {
%>
<form name="form" method="post">
<input type="text" name="Test" size="25" value=""/>
<input type="submit" name="button" value=" 确定 "/>
</form>
<%
}else{
out.println("加密前的数据："+Test +"<br/>");
out.println("加密后的数据："+DES.createEncryptor(Test) +"<br/>");
out.println("解密后的数据："+DES.createDecryptor(DES.createEncryptor(Test)) +"<br/>");
}
%>
</center></div>
</body>
</html>
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6 楼laughsmile（海边的星空） 回复于 2005-06-08 21:09:56 得分 60
import javax.crypto.*;
import java.io.*;
import javax.crypto.spec.*;
import java.security.spec.*;
public class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
// 8-byte Salt
byte[] salt = {
(byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
(byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
};
// Iteration count
int iterationCount = 19;
DesEncrypter(String passPhrase) {
try {
// Create the key
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance(
"PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
// Prepare the parameter to the ciphers
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
// Create the ciphers
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
} catch (java.security.InvalidAlgorithmParameterException e) {
} catch (java.security.spec.InvalidKeySpecException e) {
} catch (javax.crypto.NoSuchPaddingException e) {
} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
}
}
public String encrypt(String str) {
try {
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return new sun.misc.BASE64Encoder().encode(enc);
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (java.io.IOException e) {
}
return null;
}
public String decrypt(String str) {
try {
// Decode base64 to get bytes
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (java.io.IOException e) {
}
return null;
}
// Here is an example that uses the class
public static void main(String s[])
{
try {
// Create encrypter/decrypter class
DesEncrypter encrypter = new DesEncrypter("crypto");
// Encrypt
String encrypted = encrypter.encrypt("11");
System.out.println(encrypted);
// Decrypt
String decrypted = encrypter.decrypt(encrypted);
System.out.println(decrypted);
} catch (Exception e) {e.printStackTrace(); }
}
}
DES.java
package Lion.Security.Cryptography;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
/**
* DES加密的，文件*有两个方法,加密、解密
* @author Lion
* @author www.lionsky.net
*/
public class DES {
private String Algorithm = "DES";
private KeyGenerator keygen;
private SecretKey deskey;
private Cipher c;
private byte[] cipherByte;
/**
* 初始化 DES 实例
*/
public DES() {
init();
}
public void init() {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
try {
keygen = KeyGenerator.getInstance(Algorithm);
deskey = keygen.generateKey();
c = Cipher.getInstance(Algorithm);
}
catch(NoSuchAlgorithmException ex){
ex.printStackTrace();
}
catch(NoSuchPaddingException ex){
ex.printStackTrace();
}
}
/**
* 对 String 进行加密
* @param str 要加密的数据
* @return 返回加密后的 byte 数组
*/
public byte[] createEncryptor(String str) {
try {
c.init(Cipher.ENCRYPT_MODE, deskey);
cipherByte = c.doFinal(str.getBytes());
}
catch(java.security.InvalidKeyException ex){
ex.printStackTrace();
}
catch(javax.crypto.BadPaddingException ex){
ex.printStackTrace();
}
catch(javax.crypto.IllegalBlockSizeException ex){
ex.printStackTrace();
}
return cipherByte;
}
/**
* 对 Byte 数组进行解密
* @param buff 要解密的数据
* @return 返回加密后的 String
*/
public String createDecryptor(byte[] buff) {
try {
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(buff);
}
catch(java.security.InvalidKeyException ex){
ex.printStackTrace();
}
catch(javax.crypto.BadPaddingException ex){
ex.printStackTrace();
}
catch(javax.crypto.IllegalBlockSizeException ex){
ex.printStackTrace();
}
return (new String(cipherByte));
}
}
DES.jsp
<%@ page c %>
<jsp:useBean id="DES" scope="page" class="Lion.Security.Cryptography.DES" />
<html>
<head><title>DES File</title></head>
<body bgcolor="#FFFFFF">
<div align="center"><center>
<%
String Test = request.getParameter("Test");
if(Test==null || Test.equals("")) {
%>
<form name="form" method="post">
<input type="text" name="Test" size="25" value=""/>
<input type="submit" name="button" value=" 确定 "/>
</form>
<%
}else{
out.println("加密前的数据："+Test +"<br/>");
out.println("加密后的数据："+DES.createEncryptor(Test) +"<br/>");
out.println("解密后的数据："+DES.createDecryptor(DES.createEncryptor(Test)) +"<br/>");
}
%>
</center></div>
</body>
</html>
Top
6 楼laughsmile（海边的星空） 回复于 2005-06-08 21:09:56 得分 60
import javax.crypto.*;
import java.io.*;
import javax.crypto.spec.*;
import java.security.spec.*;
public class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
// 8-byte Salt
byte[] salt = {
(byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
(byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
};
// Iteration count
int iterationCount = 19;
DesEncrypter(String passPhrase) {
try {
// Create the key
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance(
"PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
// Prepare the parameter to the ciphers
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
// Create the ciphers
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
} catch (java.security.InvalidAlgorithmParameterException e) {
} catch (java.security.spec.InvalidKeySpecException e) {
} catch (javax.crypto.NoSuchPaddingException e) {
} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
}
}
public String encrypt(String str) {
try {
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return new sun.misc.BASE64Encoder().encode(enc);
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (java.io.IOException e) {
}
return null;
}
public String decrypt(String str) {
try {
// Decode base64 to get bytes
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (java.io.IOException e) {
}
return null;
}
// Here is an example that uses the class
public static void main(String s[])
{
try {
// Create encrypter/decrypter class
DesEncrypter encrypter = new DesEncrypter("crypto");
// Encrypt
String encrypted = encrypter.encrypt("11");
System.out.println(encrypted);
// Decrypt
String decrypted = encrypter.decrypt(encrypted);
System.out.println(decrypted);
} catch (Exception e) {e.printStackTrace(); }
}
}