C# 加密类工具实例分析

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加密工具类：

package com.huihui.util;
    import java.security.MessageDigest;
/** * MD5加密工具类 * @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"));
    }
}
    

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