關(guān)于java加解密自己之前了解不多禁炒,今天因?yàn)轫?xiàng)目需要用DESede加密蚌堵,于是臨時(shí)各種谷歌在網(wǎng)上查了很久芍秆,終于在百度貼吧尚武堂找到了一個(gè)關(guān)于DESede加解密的例子都伪,以下是轉(zhuǎn)載的尚武堂貼吧中的一個(gè)DESede加解密的例子
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class Xin {
/**
* @param args在java中調(diào)用sun公司提供的3DES加密解密算法時(shí)最欠,需要使
* 用到$JAVA_HOME/jre/lib/目錄下如下的4個(gè)jar包:
*jce.jar
*security/US_export_policy.jar
*security/local_policy.jar
*ext/sunjce_provider.jar
*/
private static final String Algorithm = "DESede"; //定義加密算法,可用 DES,DESede,Blowfish
//keybyte為加密密鑰示罗,長(zhǎng)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);//在單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為加密密鑰,長(zhǎng)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) {
// TODO: handle exception
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(jìn)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) {
// TODO Auto-generated method stub
//添加新安全算法,如果用JCE就要把它添加進(jìn)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 s="scretdes234234234fdgdfgd";
final byte[] keyBytes=s.getBytes();
String szSrc = "This is a 3DES test. 測(cè)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)));
String abc="scretdes234234234fdgdfgd";
System.out.println(abc.getBytes().length);
}
}
由于自己之前不清楚 DESede解密的密鑰必須是24字節(jié)的芝硬,所以之前隨便使用了一個(gè)字符串導(dǎo)致一直無(wú)法加解密成功蚜点,看到上邊事例后用24字節(jié)的密匙就成功了,自此希望各位注意一下:java DES加解密的密鑰必須為8字節(jié) DESede密鑰則為24字節(jié) 代碼最后兩行是測(cè)試密鑰字節(jié)用的