/*@author??liulang
*@version??09.3.22
*@主要是有String實現
*@從文件“msg.txt“中讀入消息
*@在將加密的細節寫入到“SHA_256.txt“文件中
*/
import?java.io.*;
public?class?SHA_256?{
????static?String?msg_binary=new?String（）;//消息用二進制表示
????static?StringBuffer?str2=new?StringBuffer（）;//可變字符串
????static?String?H0=“6a09e667“;//初始值
????static?String?H1=“bb67ae85“;
????static?String?H2=“3c6ef372“;
????static?String?H3=“a54ff53a“;
????static?String?H4=“510e527f“;
????static?String?H5=“9b05688c“;
????static?String?H6=“1f83d9ab“;
????static?String?H7=“5be0cd19“;
????static?String?ABCDEFGH;
????static?PrintWriter?out;?//輸入到文件
????static?File?file;?//文件名
????static?FileReader?fls;
????static?BufferedReader?in;?//文件輸入流
????static?long?begin;??//程序運行前的時間
????static?long?end;?????//程序運行后的時間
????static?String[]?k=new?String[64];
????static?String[]?K={
????????“428a2f98““71374491““b5c0fbcf““e9b5dba5““3956c25b““59f111f1““923f82a4““ab1c5ed5“
????????“d807aa98““12835b01““243185be““550c7dc3““72be5d74““80deb1fe““9bdc06a7““c19bf174“
????????“e49b69c1““efbe4786““0fc19dc6““240ca1cc““2de92c6f““4a7484aa““5cb0a9dc““76f988da“
????????“983e5152““a831c66d““b00327c8““bf597fc7““c6e00bf3““d5a79147““06ca6351““14292967“
????????“27b70a85““2e1b2138““4d2c6dfc““53380d13““650a7354““766a0abb““81c2c92e““92722c85“
????????“a2bfe8a1““a81a664b““c24b8b70““c76c51a3““d192e819““d6990624““f40e3585““106aa070“
????????“19a4c116““1e376c08““2748774c““34b0bcb5““391c0cb3““4ed8aa4a““5b9cca4f““682e6ff3“
????????“748f82ee““78a5636f““84c87814““8cc70208““90befffa““a4506ceb““bef9a3f7““c67178f2“};
????static?String?[]?w=new?String[80];
????static?int?group_num=1;//組數
????static?int?mod=0;//最后一組的原始長度
????public?static?void?main（String[]?args）?throws?IOException?{
????????try{
?????????????file=new?File（“msg.txt“）;
????????boolean?createok;
????????if（!file.exists（））??????????//判斷文件是否存在
????????????createok=file.createNewFile（）;?//如果文件不存在，則在當前目錄創建文件
?????????fls?=?new?FileReader（file）;
?????????in?=?new?BufferedReader（fls）;
????????String?msg=new?String（）;
????????msg=in.readLine（）;
????????
????????begin=System.currentTimeMillis（）;
????????out=new?PrintWriter（new?FileWriter（“SHA_256.txt“））;

????????for（int?i=0;i<64;i++）
????????????k[i]=hexToBinary（K[i]）;
????????msg_binary=stringToBinary（msg）;
????????final?int?SIZE=msg_binary.length（）;//消息變成二進制后的長度
????????out.println（msg.length（））;
????
????????mod=SIZE%512;

????out.println（msg_binary）;
????out.println（SIZE）;
????if（SIZE<448）
????????group_num=1;
????else?if（SIZE>=448&&SIZE<=512）
????????group_num=2;
????else?{
????????if（mod<448）
????????????group_num=SIZE/512+1;
????????else
????????????group_num=SIZE/512+2;
????}
????char[]?cw=new?char[512*group_num];///liulang
????
????for（int?i=0;i????????cw[i]=msg_binary.charAt（i）;
????}
????
????String?str1=new?String（Integer.toBinaryString（SIZE））;
????if（SIZE<448）?{
????????cw[S

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????14140??2012-05-08?09:56??SHA_256.java

?????文件???????2013??2010-10-03?12:34??www.wei2008.com.txt

-----------?---------??----------?-----??----

????????????????16153????????????????????2