在java中调用sun公司提供的3DES加密解密算法时,需要使用到$JAVA_HOME/jre/lib/目录下如下的4个jar包:
jce.jar
security/US_export_policy.jar
security/local_policy.jar
ext/sunjce_provider.jar
Java运行时会自动加载这些包,因此对于带main函数的应用程序不需要设置到CLASSPATH环境变量中。对于WEB应用,不需要把这些包加到WEB-INF/lib目录下。
以下是java中调用sun公司提供的3DES加密解密算法的样本代码:
加密解密代码
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/*字符串 DESede(3DES) 加密*/
public class ThreeDes {
/**
* @param args在java中调用sun公司提供的3DES加密解密算法时,需要使
* 用到$JAVA_HOME/jre/lib/目录下如下的4个jar包:
*jce.jar
*security/US_export_policy.jar
*security/local_policy.jar
*ext/sunjce_provider.jar
*/
private static final String Algorithm = "DESede"; //定义加密算法,可用 DES,DESede,Blowfish
//keybyte为加密密钥,长度为24字节
//src为被加密的数据缓冲区(源)
public static byte[] encryptMode(byte[] keybyte,byte[] src){
try {
//生成密钥
SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
//加密
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
return c1.doFinal(src);//在单一方面的加密或解密
} catch (java.security.NoSuchAlgorithmException e1) {
// TODO: handle exception
e1.printStackTrace();
}catch(javax.crypto.NoSuchPaddingException e2){
e2.printStackTrace();
}catch(java.lang.Exception e3){
e3.printStackTrace();
}
return null;
}
//keybyte为加密密钥,长度为24字节
//src为加密后的缓冲区
public static byte[] decryptMode(byte[] keybyte,byte[] src){
try {
//生成密钥
SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
//解密
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE, deskey);
return c1.doFinal(src);
} catch (java.security.NoSuchAlgorithmException e1) {
// TODO: handle exception
e1.printStackTrace();
}catch(javax.crypto.NoSuchPaddingException e2){
e2.printStackTrace();
}catch(java.lang.Exception e3){
e3.printStackTrace();
}
return null;
}
//转换成十六进制字符串
public static String byte2Hex(byte[] b){
? tring hs="";
String stmp="";
for(int n=0; n<b.length; n++){
stmp = (java.lang.Integer.toHexString(b[n]& 0XFF));
if(stmp.length()==1){
hs = hs + "0" + stmp;
}else{
hs = hs + stmp;
}
if(n<b.length-1)hs=hs+":";
}
return hs.toUpperCase();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
//添加新安全算法,如果用JCE就要把它添加进去
Security.addProvider(new com.sun.crypto.provider.SunJCE());
final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,
(byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51,
(byte)0xCB,
(byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,
(byte)0x98, 0x30, 0x40, 0x36,
(byte)0xE2
}; //24字节的密钥
String szSrc = "This is a 3DES test. 测试";
System.out.println("加密前的字符串:" + szSrc);
byte[] encoded = encryptMode(keyBytes,szSrc.getBytes());
System.out.println("加密后的字符串:" + new String(encoded));
byte[] srcBytes = decryptMode(keyBytes,encoded);
System.out.println("解密后的字符串:" + (new String(srcBytes)));
}
}
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