|
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security/US_export_policy.jar
security/local_policy.jar
ext/sunjce_provider.jar
Java運行時會自動加載這些包，因此對于帶main函數(shù)的應用程序不需要設置到CLASSPATH環(huán)境變量中。對于WEB應用，不需要把這些包加到WEB-INF/lib目錄下。
以下是Java中調(diào)用sun公司提供的3DES加密解密算法的樣本代碼：
復制代碼 代碼如下:
/*字符串 DESede(3DES) 加密*/
import Java.security.*;
import Javax.crypto.*;
import Javax.crypto.spec.SecretKeySpec;
public class ThreeDes {
private static final String Algorithm = "DESede"; //定義 加密算法,可用 DES,DESede,Blowfish
//keybyte為加密密鑰，長度為24字節(jié)
//src為被加密的數(shù)據(jù)緩沖區(qū)（源）
public static byte[] encryptMode(byte[] keybyte, byte[] src) {
try {
//生成密鑰
SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
//加密
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
return c1.doFinal(src);
}
catch (Java.security.NoSuchAlgorithmException e1) {
e1.printStackTrace();
}
catch (Javax.crypto.NoSuchPaddingException e2) {
e2.printStackTrace();
}
catch (Java.lang.Exception e3) {
e3.printStackTrace();
}
return null;
}
//keybyte為加密密鑰，長度為24字節(jié)
//src為加密后的緩沖區(qū)
public static byte[] decryptMode(byte[] keybyte, byte[] src) {
try {
//生成密鑰
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) {
e1.printStackTrace();
}
catch (Javax.crypto.NoSuchPaddingException e2) {
e2.printStackTrace();
}
catch (Java.lang.Exception e3) {
e3.printStackTrace();
}
return null;
}
//轉(zhuǎn)換成十六進制字符串
public static String byte2hex(byte[] b) {
String 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){
//添加新安全算法,如果用JCE就要把它添加進去
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字節(jié)的密鑰
String szSrc = "This is a 3DES test. 測試";
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)));
}
}
jsp技術(shù)：[J2SE]Java中3DES加密解密調(diào)用示例，轉(zhuǎn)載需保留來源！
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