Question

des密钥如何生成 java

Answer 1

package Encrypt;
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.

Answer 2

public DESedeEncrypt() throws Exception
{
// 固定密钥
// byte[] buffer = new byte[]{0x6B, 0x46, 0x0E, 0x64, 0x0D, 0x70, 0x5B, 0x7A, (byte) 0xD9, 0x37, 0x68,
// 0x67, (byte) 0xE0, 0x0B, (byte) 0xE9, 0x2C, 0x3D, 0x52, (byte) 0xF1, 0x4F, (byte) 0xF1, (byte) 0x9E, (byte) 0xFE, (byte) 0x94};

// System.out.println("初始化钥匙");
// byte[] buffer = new byte[]{0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
// 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31};

// byte[] buffer = new byte[]{0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef,
// (byte) 0xfe, (byte) 0xdc, (byte) 0xba, (byte) 0x98, 0x76, 0x54, 0x32, 0x10,
// (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef, 0x01, 0x23, 0x45, 0x67 };
byte[] buffer = new byte[]{0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50, 0x31, 0x32, 0x33,
0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50, 0x31, 0x32, 0x33, 0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50};
////
SecretKeySpec key = new SecretKeySpec(buffer, "DESede");

//
// ThreeDES des = new ThreeDES();// 实例化一个对像
// des.getKey("G3CMOP123G3CMOP123G3CMOP");// 生成密匙
//
// Key key = des.key;

encryptCipher = Cipher.getInstance(KEY_ALGORITHM);
encryptCipher.init(Cipher.ENCRYPT_MODE, key);

decryptCipher = Cipher.getInstance("DESede/ECB/NoPadding");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}

Answer 3

public DESedeEncrypt() throws Exception
{
// 固定密钥
// byte[] buffer = new byte[]{0x6B, 0x46, 0x0E, 0x64, 0x0D, 0x70, 0x5B, 0x7A, (byte) 0xD9, 0x37, 0x68,
// 0x67, (byte) 0xE0, 0x0B, (byte) 0xE9, 0x2C, 0x3D, 0x52, (byte) 0xF1, 0x4F, (byte) 0xF1, (byte) 0x9E, (byte) 0xFE, (byte) 0x94};

// System.out.println("初始化钥匙");
// byte[] buffer = new byte[]{0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
// 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31};

// byte[] buffer = new byte[]{0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef,
// (byte) 0xfe, (byte) 0xdc, (byte) 0xba, (byte) 0x98, 0x76, 0x54, 0x32, 0x10,
// (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef, 0x01, 0x23, 0x45, 0x67 };
byte[] buffer = new byte[]{0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50, 0x31, 0x32, 0x33,
0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50, 0x31, 0x32, 0x33, 0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50};
////
SecretKeySpec key = new SecretKeySpec(buffer, "DESede");

//
// ThreeDES des = new ThreeDES();// 实例化一个对像
// des.getKey("G3CMOP123G3CMOP123G3CMOP");// 生成密匙
//
// Key key = des.key;

encryptCipher = Cipher.getInstance(KEY_ALGORITHM);
encryptCipher.init(Cipher.ENCRYPT_MODE, key);

decryptCipher = Cipher.getInstance("DESede/ECB/NoPadding");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}

Answer 4

查一下des的加密api就行了，百度一下比在这里等回答好