Des加解密工具
import java.security.Key; import java.security.Security; import java.util.Date; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import com.hurong.core.util.DateUtil;
public class DesUtils {
private static String strDefaultKey = "";//字符串默认键值 private Cipher encryptCipher = null;//加密工具 private Cipher decryptCipher = null;//解密工具
/** * 将byte数组转换为表示16进制值的字符串, 如:byte[]{8,18}转换为:0813, 和public static byte[] * hexStr2ByteArr(String strIn) 互为可逆的转换过程 * @param arrB 需要转换的byte数组 * @return 转换后的字符串 * */ public static String byteArr2HexStr(byte[] arrB){ int iLen = arrB.length; StringBuffer sb = new StringBuffer(iLen * 2);// 每个byte用两个字符才能表示,所以字符串的长度是数组长度的两倍 for (int i = 0; i < iLen; i++) { int intTmp = arrB[i]; while (intTmp < 0) {// 把负数转换为正数 intTmp = intTmp + 256; } if (intTmp < 16) {// 小于0F的数需要在前面补0 sb.append("0"); } sb.append(Integer.toString(intTmp, 16)); } return sb.toString(); }
/** * 将表示16进制值的字符串转换为byte数组, 和public static String byteArr2HexStr(byte[] arrB) * 互为可逆的转换过程 * * @param strIn 需要转换的字符串 * @return 转换后的byte数组 */ public static byte[] hexStr2ByteArr(String strIn){ byte[] arrB = strIn.getBytes(); int iLen = arrB.length; byte[] arrOut = new byte[iLen / 2];// 两个字符表示一个字节,所以字节数组长度是字符串长度除以2 for (int i = 0; i < iLen; i = i + 2) { String strTmp = new String(arrB, i, 2); arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16); } return arrOut; }
/** * 默认构造方法,使用默认密钥 * * @throws Exception */ public DesUtils() throws Exception { this(strDefaultKey); }
/** * DES字符串加密 * 指定密钥构造方法 * @param strKey 指定的密钥 * @throws Exception */ public DesUtils(String strKey){ Security.addProvider(new com.sun.crypto.provider.SunJCE()); try { Key key = getKey(strKey.getBytes()); encryptCipher = Cipher.getInstance("DES"); encryptCipher.init(Cipher.ENCRYPT_MODE, key); decryptCipher = Cipher.getInstance("DES"); decryptCipher.init(Cipher.DECRYPT_MODE, key); } catch (Exception e) { e.printStackTrace(); } }
/** * 加密字节数组 * * @param arrB 需加密的字节数组 * @return 加密后的字节数组 * @throws Exception */ public byte[] encrypt(byte[] arrB){ byte[] encrypt=null; try { encrypt=encryptCipher.doFinal(arrB); } catch (Exception e) { e.printStackTrace(); return null; } return encrypt; }
/** * 加密字符串 * * @param strIn 需加密的字符串 * @return 加密后的字符串 * @throws Exception */ public String encrypt(String strIn){ return byteArr2HexStr(encrypt(strIn.getBytes())); }
/** * 解密字节数组 * * @param arrB 需解密的字节数组 * @return 解密后的字节数组 * @throws Exception */ public byte[] decrypt(byte[] arrB) throws BadPaddingException{ byte[] decrypt=null; try { decrypt= decryptCipher.doFinal(arrB); } catch (Exception e) { //e.printStackTrace(); return null; } return decrypt; }
/** * 解密字符串 * * @param strIn 需解密的字符串 * @return 解密后的字符串 * @throws Exception */ public String decrypt(String strIn) throws BadPaddingException{
if(null==decrypt(hexStr2ByteArr(strIn))){ return ""; } return new String(decrypt(hexStr2ByteArr(strIn))); }
/** * 从指定字符串生成密钥,密钥所需的字节数组长度为8位 不足8位时后面补0,超出8位只取前8位 * * @param arrBTmp 构成该字符串的字节数组 * @return 生成的密钥 * @throws java.lang.Exception */ private Key getKey(byte[] arrBTmp) throws Exception { byte[] arrB = new byte[8];// 创建一个空的8位字节数组(默认值为0) for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {// 将原始字节数组转换为8位 arrB[i] = arrBTmp[i]; } Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");// 生成密钥 return key; } public static boolean getAuthorization(String password,String key){
try{ boolean flag=false; DesUtils des = new DesUtils(password);//自定义密钥 String code=des.decrypt(key); String mac=GetMACUtil.getMacStr();//机器码 if(mac.equals(code)){ flag=true; } return flag; } catch (Exception e) { e.printStackTrace(); return false; } }
public String getEncod(String mahCode,String password,String endDate,DesUtils des) { try { String str=""; String dstr=mahCode+","+endDate; str=des.encrypt(dstr); return str; } catch (Exception e) { e.printStackTrace(); return ""; } } public static void main(String[] args) { DesUtils du=new DesUtils("creditsoftware"); String code=du.getEncod("70-1A-04-71-09-0E", "creditsoftware", "2012-12-31", du); System.out.println(code);
} } |