//第一种
import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.apache.log4j.Logger;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;/** * 用户密码加密解密 */public class Crypt {public static Logger logger = Logger.getLogger(Crypt.class.getName());public static String KEYSTRING="202cb962ac59075b964b07152d234b70";// --------------------------------------------------------------------------------------------// 获得密钥public static SecretKey getKey(String s) throws Exception {// s ="g8TlgLEc6oqZxdwGe6pDiKB8Y";//System.out.println("s==" + s);char[] ss = s.toCharArray();String sss = "";for (int i = 0; i < ss.length; i = i + 2) {sss = sss + ss[i];} SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");DESKeySpec ks = new DESKeySpec(sss.substring(0, 8).getBytes());SecretKey kd = kf.generateSecret(ks);return kd;}// --------------------------------------------------------------------------------------------------// 返回加密后的字符串// key是用于生成密钥的字符串，input是要加密的字符串public static String getEncryptedString(String key, String input) {String base64 = "";try {Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, getKey(key));//System.out.print("getKey(key)===" + getKey(key) + "key==" + key);byte[] inputBytes = input.getBytes();byte[] outputBytes = cipher.doFinal(inputBytes);BASE64Encoder encoder = new BASE64Encoder();base64 = encoder.encode(outputBytes);} catch (Exception e) {base64 = e.getMessage();logger.debug("加密出错："+e.getMessage());}return base64;}// --------------------------------------------------------------------------------------------------// 返回解密后的字符串// key是用于生成密钥的字符串，input是要解密的字符串public static String getDecryptedString(String key, String input) {String result = null;try {Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, getKey(key));BASE64Decoder decoder = new BASE64Decoder();byte[] raw = decoder.decodeBuffer(input);byte[] stringBytes = cipher.doFinal(raw);result = new String(stringBytes, "UTF8");} catch (Exception e) {result = e.getMessage();logger.debug("解密出错："+e.getMessage());}return result;}public static String getKeyByResource(){String str = ApplicationResource.getValueByKey("password.key");if(str!=null && !str.equals("")){return str;}else{return KEYSTRING;}}/** * 加密 * @param input 加密前的字符串 * @return */public static String getEncryptedString(String input){return getEncryptedString(getKeyByResource(),input);}/** * 解密 * @param input 加密后的字符串 * @return */public static String getDecryptedString(String input) {return getDecryptedString(getKeyByResource(),input);}}//第二种
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/*字符串 DESede(3DES) 加密*//**
* @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
*/public class Te { private static final String Algorithm = "DESede"; //定义加密算法,可用 DES,DESede,Blowfish 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)));
} //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){
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();
}
}
/***
* 16位MD加密算法
* @param content
* @return 16位MD5
*/
private static String get16BitMd5(String content) {
String result = null;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
byte[] source = content.getBytes("utf-8");
char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c',
'd', 'e', 'f' };
md5.update(source);
byte tmp[] = md5.digest(); // MD5 的计算结果是一个 128 位的长整数，
// 用字节表示就是 16 个字节
char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话，使用两个字符，
// 所以表示成 16 进制需要 32 个字符
int k = 0; // 表示转换结果中对应的字符位置
for (int i = 0; i < 16; i++) { // 从第一个字节开始，对 MD5 的每一个字节
// 转换成 16 进制字符的转换
byte byte0 = tmp[i]; // 取第 i 个字节
str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换,
// >>> 为逻辑右移，将符号位一起右移
str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
}
// 换后的结果转换为字符串
result = new String(str);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/***
* 32位MD加密算法
*
* @param content
* @return 32位MD5
*/
private static String get32BitMd5(String content) {
// 返回字符串
String md5Str = null;
try {
// 操作字符串
StringBuffer buf = new StringBuffer();
MessageDigest md = MessageDigest.getInstance("MD5");
// 添加要进行计算摘要的信息,使用 content 的 byte 数组更新摘要。
md.update(content.getBytes());
// 计算出摘要,完成哈希计算。
byte b[] = md.digest();
int i;
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0) {
i += 256;
}
if (i < 16) {
buf.append("0");
}
// 将整型 十进制 i 转换为16位，用十六进制参数表示的无符号整数值的字符串表示形式。
buf.append(Integer.toHexString(i));
}
// 32位的加密
md5Str = buf.toString();
// 16位的加密
// md5Str = buf.toString().md5Strstring(8,24);
} catch (Exception e) {
e.printStackTrace();
}
return md5Str;
}
}