package web536.utils;
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
*/
///byte明文,加密成byte密文
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
*/
//byte密文,加密成byte明文
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 dd=new DesEncrypt();
String mm="aaabbb";
String aa=dd.getEncString(mm);
System.out.print(aa);
String bb=dd.getDesString(aa);
System.out.print(bb);
}}
经常报如下错误:
E:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "E:\adweb\classes;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-beanutils.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-collections.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-digester.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-fileupload.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-lang.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-logging.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-validator.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\jakarta-oro.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\struts.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-tomcat-4.1.27-LE-jdk14\common\lib\servlet.jar;E:\java代码\lib-jar\commons-dbcp.jar;E:\Borland\JBuilder2005\jdk1.4\bin\SHOCK.jar;E:\Borland\JBuilder2005\jdk1.4\jre\bin\SHOCK.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;E:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;E:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;E:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;E:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar" -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=lenovo-4fbce9bd:3606,suspend=y web536.utils.DesEncrypt
java.lang.NullPointerException at com.sun.crypto.provider.DESCipher.engineGetKeySize(DashoA6275) at javax.crypto.Cipher.init(DashoA6275) at web536.utils.DesEncrypt.getEncCode(DesEncrypt.java:115) at web536.utils.DesEncrypt.getEncString(DesEncrypt.java:57) at web536.utils.DesEncrypt.main(DesEncrypt.java:155)java.lang.NullPointerException at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:89) at sun.misc.CharacterEncoder.encode(CharacterEncoder.java:170) at web536.utils.DesEncrypt.getEncString(DesEncrypt.java:58) at web536.utils.DesEncrypt.main(DesEncrypt.java:155)java.lang.NullPointerException at com.sun.crypto.provider.DESCipher.engineGetKeySize(DashoA6275) at javax.crypto.Cipher.init(DashoA6275) at web536.utils.DesEncrypt.getDesCode(DesEncrypt.java:140) at web536.utils.DesEncrypt.getDesString(DesEncrypt.java:87) at web536.utils.DesEncrypt.main(DesEncrypt.java:157)java.lang.NullPointerException at java.lang.String.<init>(String.java:346) at web536.utils.DesEncrypt.getDesString(DesEncrypt.java:88) at web536.utils.DesEncrypt.main(DesEncrypt.java:157)
57行代码是: byteMi = this.getEncCode(byteMing);115 行代码是: cipher.init(Cipher.ENCRYPT_MODE, key);
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
*/
///byte明文,加密成byte密文
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
*/
//byte密文,加密成byte明文
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 dd=new DesEncrypt();
String mm="aaabbb";
String aa=dd.getEncString(mm);
System.out.print(aa);
String bb=dd.getDesString(aa);
System.out.print(bb);
}}
经常报如下错误:
E:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "E:\adweb\classes;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-beanutils.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-collections.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-digester.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-fileupload.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-lang.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-logging.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\commons-validator.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\jakarta-oro.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-struts-1.1-lib\struts.jar;E:\Borland\JBuilder2005\thirdparty\jakarta-tomcat-4.1.27-LE-jdk14\common\lib\servlet.jar;E:\java代码\lib-jar\commons-dbcp.jar;E:\Borland\JBuilder2005\jdk1.4\bin\SHOCK.jar;E:\Borland\JBuilder2005\jdk1.4\jre\bin\SHOCK.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;E:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;E:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;E:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;E:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;E:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar" -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=lenovo-4fbce9bd:3606,suspend=y web536.utils.DesEncrypt
java.lang.NullPointerException at com.sun.crypto.provider.DESCipher.engineGetKeySize(DashoA6275) at javax.crypto.Cipher.init(DashoA6275) at web536.utils.DesEncrypt.getEncCode(DesEncrypt.java:115) at web536.utils.DesEncrypt.getEncString(DesEncrypt.java:57) at web536.utils.DesEncrypt.main(DesEncrypt.java:155)java.lang.NullPointerException at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:89) at sun.misc.CharacterEncoder.encode(CharacterEncoder.java:170) at web536.utils.DesEncrypt.getEncString(DesEncrypt.java:58) at web536.utils.DesEncrypt.main(DesEncrypt.java:155)java.lang.NullPointerException at com.sun.crypto.provider.DESCipher.engineGetKeySize(DashoA6275) at javax.crypto.Cipher.init(DashoA6275) at web536.utils.DesEncrypt.getDesCode(DesEncrypt.java:140) at web536.utils.DesEncrypt.getDesString(DesEncrypt.java:87) at web536.utils.DesEncrypt.main(DesEncrypt.java:157)java.lang.NullPointerException at java.lang.String.<init>(String.java:346) at web536.utils.DesEncrypt.getDesString(DesEncrypt.java:88) at web536.utils.DesEncrypt.main(DesEncrypt.java:157)
57行代码是: byteMi = this.getEncCode(byteMing);115 行代码是: cipher.init(Cipher.ENCRYPT_MODE, key);
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