1package com.resoft.util; 3import java.io.UnsupportedEncodingException; 4import java.security.InvalidKeyException; 5import java.security.MessageDigest; 6import java.security.NoSuchAlgorithmException; 7import java.security.SecureRandom; 8import java.security.spec.InvalidKeySpecException; 10import javax.crypto.BadPaddingException; 11import javax.crypto.Cipher; 12import javax.crypto.IllegalBlockSizeException; 13import javax.crypto.NoSuchPaddingException; 14import javax.crypto.SecretKey; 15import javax.crypto.SecretKeyFactory; 16import javax.crypto.spec.DESKeySpec; 18import sun.misc.BASE64Encoder; 20/** *//** * 安全加密类 * * @date 2007-10-31 * @author yayagepei * */ 27public class SecurityEncode { /** *//** * MD5方式加密字符串 * * @param str * 要加密的字符串 * @return 加密后的字符串 * @throws NoSuchAlgorithmException * @throws UnsupportedEncodingException * @author yayagepei * @date 2007-10-31 * @comment 程序的价值体现在两个方面:它现在的价值,它未来的价值 */ public static String encoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException { // 确定计算方法 MessageDigest md5 = MessageDigest.getInstance("MD5"); BASE64Encoder base64en = new BASE64Encoder(); // 加密后的字符串 String newstr = base64en.encode(md5.digest(str.getBytes("utf-8"))); return newstr; } /** *//** * DES加解密 * * @param plainText * 要处理的byte[] * @param key * 密钥 * @param mode * 模式 * @return * @throws InvalidKeyException * @throws InvalidKeySpecException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws BadPaddingException * @throws IllegalBlockSizeException * @throws UnsupportedEncodingException * @author yayagepei * @date 2008-10-8 */ private static byte[] coderByDES(byte[] plainText, String key, int mode) throws InvalidKeyException, InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException { SecureRandom sr = new SecureRandom(); byte[] resultKey = makeKey(key); DESKeySpec desSpec = new DESKeySpec(resultKey); SecretKey secretKey = SecretKeyFactory.getInstance("DES") .generateSecret(desSpec); Cipher cipher = Cipher.getInstance("DES"); cipher.init(mode, secretKey, sr); return cipher.doFinal(plainText); } /** *//** * 生产8位的key * * @param key * 字符串形式 * @return * @throws UnsupportedEncodingException * @author yayagepei * @date 2008-10-8 */ private static byte[] makeKey(String key) throws UnsupportedEncodingException { byte[] keyByte = new byte[8]; byte[] keyResult = key.getBytes("UTF-8"); for (int i = 0; i < keyResult.length && i < keyByte.length; i++) { keyByte[i] = keyResult[i]; } return keyByte; } /** *//** * DES加密 * * @param plainText * 明文 * @param key * 密钥 * @return * @author yayagepei * @date 2008-10-8 */ public static String encoderByDES(String plainText, String key) { try { byte[] result = coderByDES(plainText.getBytes("UTF-8"), key, Cipher.ENCRYPT_MODE); return byteArr2HexStr(result); } catch (Exception ex) { ex.printStackTrace(); return ""; } } /** *//** * DES解密 * * @param secretText * 密文 * @param key * 密钥 * @return * @author yayagepei * @date 2008-10-8 */ public static String decoderByDES(String secretText, String key) { try { byte[] result = coderByDES(hexStr2ByteArr(secretText), key, Cipher.DECRYPT_MODE); return new String(result, "UTF-8"); } catch (Exception ex) { ex.printStackTrace(); return ""; } } /** *//** * 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 */ private static String byteArr2HexStr(byte[] arrB){ int iLen = arrB.length; // 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 StringBuffer sb = new StringBuffer(iLen * 2); for (int i = 0; i < iLen; i++) { int intTmp = arrB[i]; // 把负数转换为正数 while (intTmp < 0) { intTmp = intTmp + 256; } // 小于0F的数需要在前面补0 if (intTmp < 16) { 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 * @throws NumberFormatException */ private static byte[] hexStr2ByteArr(String strIn) throws NumberFormatException { byte[] arrB = strIn.getBytes(); int iLen = arrB.length; // 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 byte[] arrOut = new byte[iLen / 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; } 199} 200
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