Go语言视频零基础入门到精通

javalearner

1. package com.lavasoft.common.security;
   
2. /**
   
3. * MD5工具
   
4. *
   
5. * @author leizhimin 2010-6-3 11:10:29
   
6. */
   
7. import java.security.MessageDigest;
   
8. public class MD5 {
   
9.     /**
   
10.      * MD5值计算

复制代码

* MD5的算法在RFC1321 中定义: * 在RFC 1321中，给出了Test suite用来检验你的实现是否正确： * MD5 ("") = d41d8cd98f00b204e9800998ecf8427e * MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661 * MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72 * MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0 * MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b * * @param res 源字符串 * @return md5值 */ public final static String MD5(String res) { char hexDigits[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"}; try { byte[] strTemp = res.getBytes(); MessageDigest mdTemp = MessageDigest.getInstance("MD5"); mdTemp.update(strTemp); byte[] md = mdTemp.digest(); int j = md.length; char str[] = new char[j * 2]; int k = 0; for (int i = 0; i < j; i++) { byte byte0 = md; str[k++] = hexDigits[byte0 >>> 4 & 0xf]; str[k++] = hexDigits[byte0 & 0xf]; } String dd = new String(str); return dd; } catch (Exception e) { return null; } } public static void main(String[] args) { System.out.println(MD5.MD5("")); System.out.println(MD5.MD5("a")); System.out.println(MD5.MD5("abc")); } } package com.lavasoft.common.security; import java.io.UnsupportedEncodingException; /** * Base64双向加密工具 * * @author leizhimin 2010-6-3 14:10:11 */ public class Base64 { private static char[] base64EncodeChars = new char[]{ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/"}; private static byte[] base64DecodeChars = new byte[]{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1}; /** * 加密 * * @param data 明文的字节数组 * @return 密文字符串 */ public static String encode(byte[] data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[(b1 & 0x3) << 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); } /** * 解密 * * @param str 密文 * @return 明文的字节数组 * @throws UnsupportedEncodingException */ public static byte[] decode(String str) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); byte[] data = str.getBytes("US-ASCII"); int len = data.length; int i = 0; int b1, b2, b3, b4; while (i < len) { /* b1 */ do { b1 = base64DecodeChars[data[i++]]; } while (i < len && b1 == -1); if (b1 == -1) break; /* b2 */ do { b2 = base64DecodeChars [data[i++]]; } while (i < len && b2 == -1); if (b2 == -1) break; sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4))); /* b3 */ do { b3 = data[i++]; if (b3 == 61) return sb.toString().getBytes("iso8859-1"); b3 = base64DecodeChars[b3]; } while (i < len && b3 == -1); if (b3 == -1) break; sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); /* b4 */ do { b4 = data[i++]; if (b4 == 61) return sb.toString().getBytes("iso8859-1"); b4 = base64DecodeChars[b4]; } while (i < len && b4 == -1); if (b4 == -1) break; sb.append((char) (((b3 & 0x03) << 6) | b4)); } return sb.toString().getBytes("iso8859-1"); } public static void main(String[] args) throws UnsupportedEncodingException { String s = "abcd"; System.out.println("加密前：" + s); String x = encode(s.getBytes()); System.out.println("加密后：" + x); String x1 = new String(decode(x)); System.out.println("解密后：" + x1); } } package com.lavasoft.common.security; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import java.security.Key; import java.security.SecureRandom; /** * 使用3DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储. * * @author leizhimin 2010-6-3 11:10:54 */ public class ThreeDES { private Key key; //密钥 /** * 根据参数生成KEY * * @param strKey 密钥字符串 */ public void getKey(String strKey) { try { KeyGenerator _generator = KeyGenerator.getInstance("DES"); _generator.init(new SecureRandom(strKey.getBytes())); this.key = _generator.generateKey(); _generator = null; } catch (Exception e) { e.printStackTrace(); } } /** * 加密String明文输入,String密文输出 * * @param strMing String明文 * @return String密文 */ public String getEncString(String strMing) { byte[] byteMi = null; byte[] byteMing = null; String strMi = ""; BASE64Encoder base64en = new BASE64Encoder(); try { byteMing = strMing.getBytes("UTF8"); byteMi = this.getEncCode(byteMing); strMi = base64en.encode(byteMi); } catch (Exception e) { e.printStackTrace(); } finally { base64en = null; byteMing = null; byteMi = null; } return strMi; } /** * 解密 以String密文输入,String明文输出 * * @param strMi String密文 * @return String明文 */ public String getDesString(String strMi) { BASE64Decoder base64De = new BASE64Decoder(); byte[] byteMing = null; byte[] byteMi = null; String strMing = ""; try { byteMi = base64De.decodeBuffer(strMi); byteMing = this.getDesCode(byteMi); strMing = new String(byteMing, "UTF8"); } catch (Exception e) { e.printStackTrace(); } finally { base64De = null; byteMing = null; byteMi = null; } return strMing; } /** * 加密以byte[]明文输入,byte[]密文输出 * * @param byteS byte[]明文 * @return byte[]密文 */ private byte[] getEncCode(byte[] byteS) { byte[] byteFina = null; Cipher cipher; try { cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, key); byteFina = cipher.doFinal(byteS); } catch (Exception e) { e.printStackTrace(); } finally { cipher = null; } return byteFina; } /** * 解密以byte[]密文输入,以byte[]明文输出 * * @param byteD byte[]密文 * @return byte[]明文 */ private byte[] getDesCode(byte[] byteD) { Cipher cipher; byte[] byteFina = null; try { cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, key); byteFina = cipher.doFinal(byteD); } catch (Exception e) { e.printStackTrace(); } finally { cipher = null; } return byteFina; } public static void main(String[] args) { ThreeDES des = new ThreeDES(); // 实例化一个对像 des.getKey("abcdefgasiainfo"); // 生成密匙 String strEnc = des.getEncString("abc");// 加密字符串,返回String的密文 System.out.println(strEnc); String strDes = des.getDesString(strEnc);// 把String 类型的密文解密 System.out.println(strDes); } }

   
     
     
      
      

        
      

        
      
     
   

  


源码下载：http://file.javaxxz.com/2014/11/24/000522515.zip