C# 加密類工具執行個體分析

5.SHA1加密

//sha1加密    public static String getSha1(String str){        if(str==null||str.length()==0){            return null;        }                char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};                try {            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");            mdTemp.update(str.getBytes("UTF-8"));                        byte[] md = mdTemp.digest();                        int j = md.length;                        char buf[] = new char[j*2];                        int k = 0;                        for (int i = 0; i < j; i++) {                            byte byte0 = md[i];                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];                buf[k++] = hexDigits[byte0 & 0xf];            }            return new String(buf);        } catch (Exception e) {                    return null;        }    }

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6.MD5加密工具類：

package com.huihui.util;import java.security.MessageDigest;/** * MD5加密工具類 * @author Administrator * */public class Md5Util {     public final static String MD5(String s){         char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};         try {            byte[] strTemp = s.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[i];                str[k++] = hexDigits[byte0>>>4&0xf];                str[k++] = hexDigits[byte0 & 0xf];            }            return new String(str);        } catch (Exception e) {                    return null;        }    }    public static void main(String[] args) {        System.out.println(Md5Util.MD5("b"));    }}