在java中
sun公司提供
3DES加密解密算法时
需要使用到$JAVA_HOME/jre/lib/目录下如下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
应用
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
sun公司提供3DES加密解密算法样本代码:/*
串 DESede(3DES) 加密*/ import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
public
ThreeDes { private
final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish //key
为加密密钥长度为24字节 //src为被加密
数据缓冲区(源) public
encryptMode( key, src) { try {
//生成密钥
SecretKey deskey =
SecretKeySpec(key, Algorithm); //加密
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
c1.doFinal(src); }
catch (java.security.NoSuchAlgorithmException e1) {
e1.pr
StackTrace
; }
catch (javax.crypto.NoSuchPaddingException e2) {
e2.pr
StackTrace; }
catch (java.lang.Exception e3) {
e3.pr
StackTrace; }
null; }
//key
为加密密钥长度为24字节 //src为加密后
缓冲区 public
decryptMode( key, src) { try {
//生成密钥
SecretKey deskey =
SecretKeySpec(key, Algorithm); //解密
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE, deskey);
c1.doFinal(src); }
catch (java.security.NoSuchAlgorithmException e1) {
e1.pr
StackTrace; }
catch (javax.crypto.NoSuchPaddingException e2) {
e2.pr
StackTrace; }
catch (java.lang.Exception e3) {
e3.pr
StackTrace; }
null; }
//转换成十 6进制
串 public
String 2hex( b) { String hs="";
String stmp="";
for (
n=0;n<b.length;n
) { stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
(stmp.length
1) hs=hs+"0"+stmp; 
hs=hs+stmp; (n<b.length-1) hs=hs+":"; }
hs.toUpperCase; }
public
void (String args){ //添加新安全算法,如果用JCE就要把它添加进去
Security.addProvider(
com.sun.crypto.provider.SunJCE); final
keyBytes = {0x11, 0x22, 0x4F, 0x58, (
)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (
)0xCB, ()0xDD, 0x55, 0x66, 0x77, 0x29, 0x74, (
)0x98, 0x30, 0x40, 0x36, ()0xE2 }; //24字节
密钥 String szSrc = "This is a 3DES test. 测试";
.out.prln("加密前串:" + szSrc); encoded = encryptMode(keyBytes, szSrc.getBytes); .out.prln("加密后串:" + String(encoded)); srcBytes = decryptMode(keyBytes, encoded); .out.prln("解密后串:" + ( String(srcBytes))); }
}
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