emu in blogjava

  BlogJava :: 首页 :: 新随笔 :: 联系 :: 聚合  :: 管理 ::
  171 随笔 :: 103 文章 :: 1052 评论 :: 2 Trackbacks
java版的sha-1

/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 * in FIPS PUB 180-1
 * Copyright (C) Paul Johnston 2000 - 2002.
 * See http://pajhome.org.uk/site/legal.html for details.
 */

/*
 * Convert a 32-bit number to a hex string with ms-byte first
 */
var hex_chr = "0123456789abcdef";
function hex(num)
{
  var str = "";
  for(var j = 7; j >= 0; j--)
    str += hex_chr.charAt((num >> (j * 4)) & 0x0F);
  return str;
}

/*
 * Convert a string to a sequence of 16-word blocks, stored as an array.
 * Append padding bits and the length, as described in the SHA1 standard.
 */
function str2blks_SHA1(str)
{
  var nblk = ((str.length + 8) >> 6) + 1;
  var blks = new Array(nblk * 16);
  for(var i = 0; i < nblk * 16; i++) blks[i] = 0;
  for(var i = 0; i < str.length; i++)
    blks[i >> 2] |= str.charCodeAt(i) << (24 - (i % 4) * 8);
  blks[i >> 2] |= 0x80 << (24 - (i % 4) * 8);
  blks[nblk * 16 - 1] = str.length * 8;
  return blks;
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left
 */
function rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Perform the appropriate triplet combination function for the current
 * iteration
 */
function ft(t, b, c, d)
{
  if(t < 20) return (b & c) | ((~b) & d);
  if(t < 40) return b ^ c ^ d;
  if(t < 60) return (b & c) | (b & d) | (c & d);
  return b ^ c ^ d;
}

/*
 * Determine the appropriate additive constant for the current iteration
 */
function kt(t)
{
  return (t < 20) ?  1518500249 : (t < 40) ?  1859775393 :
         (t < 60) ? -1894007588 : -899497514;
}

/*
 * Take a string and return the hex representation of its SHA-1.
 */
function calcSHA1(str)
{
  var x = str2blks_SHA1(str);
  var w = new Array(80);

  var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;
  var e = -1009589776;

  for(var i = 0; i < x.length; i += 16)
  {
    var olda = a;
    var oldb = b;
    var oldc = c;
    var oldd = d;
    var olde = e;

    for(var j = 0; j < 80; j++)
    {
      if(j < 16) w[j] = x[i + j];
      else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
      var t = safe_add(safe_add(rol(a, 5), ft(j, b, c, d)), safe_add(safe_add(e, w[j]), kt(j)));
      e = d;
      d = c;
      c = rol(b, 30);
      b = a;
      a = t;
    }

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
    e = safe_add(e, olde);
  }
  return hex(a) + hex(b) + hex(c) + hex(d) + hex(e);
}




java版的MD5










public class MD5
{
  /*
   * A Java implementation of the RSA Data Security, Inc. MD5 Message
   * Digest Algorithm, as defined in RFC 1321.
   * Based on the JavaScript implementation of Paul Johnston
   *      Copyright (C) Paul Johnston 1999 - 2000.
   *      See http://pajhome.org.uk/site/legal.html for details.
   * Java Version by Thomas Weber (Orange Interactive GmbH)
   */
 
  /*
   * Convert a 32-bit number to a hex string with ls-byte first
   */
  String hex_chr = "0123456789abcdef";
  private String rhex(int num)
  {
    String str = "";
    for(int j = 0; j <= 3; j++)
      str = str + hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F);
    return str;
  }
 
  /*
   * Convert a string to a sequence of 16-word blocks, stored as an array.
   * Append padding bits and the length, as described in the MD5 standard.
   */
  private int[] str2blks_MD5(String str)
  {
    int nblk = ((str.length() + 8) >> 6) + 1;
    int[] blks = new int[nblk * 16];
    int i = 0;
    for(i = 0; i < nblk * 16; i++) {
      blks[i] = 0;
    }
    for(i = 0; i < str.length(); i++) {
      blks[i >> 2] |= str.charAt(i) << ((i % 4) * 8);
    }
    blks[i >> 2] |= 0x80 << ((i % 4) * 8);
    blks[nblk * 16 - 2] = str.length()*8;
     
    return blks;
  }
 
  /*
   * Add integers, wrapping at 2^32
   */
  private int add(int x, int y)
  {
    return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000);
  }
 
  /*
   * Bitwise rotate a 32-bit number to the left
   */
  private int rol(int num, int cnt)
  {
    return (num << cnt) | (num >>> (32 - cnt));
  }
 
  /*
   * These functions implement the basic operation for each round of the
   * algorithm.
   */
  private int cmn(int q, int a, int b, int x, int s, int t)
  {
    return add(rol(add(add(a, q), add(x, t)), s), b);
  }
  private int ff(int a, int b, int c, int d, int x, int s, int t)
  {
    return cmn((b & c) | ((~b) & d), a, b, x, s, t);
  }
  private int gg(int a, int b, int c, int d, int x, int s, int t)
  {
    return cmn((b & d) | (c & (~d)), a, b, x, s, t);
  }
  private int hh(int a, int b, int c, int d, int x, int s, int t)
  {
    return cmn(b ^ c ^ d, a, b, x, s, t);
  }
  private int ii(int a, int b, int c, int d, int x, int s, int t)
  {
    return cmn(c ^ (b | (~d)), a, b, x, s, t);
  }
 
  /*
   * Take a string and return the hex representation of its MD5.
   */
  public String calcMD5(String str)
  {
    int[] x = str2blks_MD5(str);
    int a = 0x67452301;
    int b = 0xEFCDAB89;
    int c = 0x98BADCFE;
    int d = 0x10325476;
 
    for(int i = 0; i < x.length; i += 16)
    {
      int olda = a;
      int oldb = b;
      int oldc = c;
      int oldd = d;
 
      a = ff(a, b, c, d, x[i+ 0], 7 , 0xD76AA478);
      d = ff(d, a, b, c, x[i+ 1], 12, 0xE8C7B756);
      c = ff(c, d, a, b, x[i+ 2], 17, 0x242070DB);
      b = ff(b, c, d, a, x[i+ 3], 22, 0xC1BDCEEE);
      a = ff(a, b, c, d, x[i+ 4], 7 , 0xF57C0FAF);
      d = ff(d, a, b, c, x[i+ 5], 12, 0x4787C62A);
      c = ff(c, d, a, b, x[i+ 6], 17, 0xA8304613);
      b = ff(b, c, d, a, x[i+ 7], 22, 0xFD469501);
      a = ff(a, b, c, d, x[i+ 8], 7 , 0x698098D8);
      d = ff(d, a, b, c, x[i+ 9], 12, 0x8B44F7AF);
      c = ff(c, d, a, b, x[i+10], 17, 0xFFFF5BB1);
      b = ff(b, c, d, a, x[i+11], 22, 0x895CD7BE);
      a = ff(a, b, c, d, x[i+12], 7 , 0x6B901122);
      d = ff(d, a, b, c, x[i+13], 12, 0xFD987193);
      c = ff(c, d, a, b, x[i+14], 17, 0xA679438E);
      b = ff(b, c, d, a, x[i+15], 22, 0x49B40821);
 
      a = gg(a, b, c, d, x[i+ 1], 5 , 0xF61E2562);
      d = gg(d, a, b, c, x[i+ 6], 9 , 0xC040B340);
      c = gg(c, d, a, b, x[i+11], 14, 0x265E5A51);
      b = gg(b, c, d, a, x[i+ 0], 20, 0xE9B6C7AA);
      a = gg(a, b, c, d, x[i+ 5], 5 , 0xD62F105D);
      d = gg(d, a, b, c, x[i+10], 9 , 0x02441453);
      c = gg(c, d, a, b, x[i+15], 14, 0xD8A1E681);
      b = gg(b, c, d, a, x[i+ 4], 20, 0xE7D3FBC8);
      a = gg(a, b, c, d, x[i+ 9], 5 , 0x21E1CDE6);
      d = gg(d, a, b, c, x[i+14], 9 , 0xC33707D6);
      c = gg(c, d, a, b, x[i+ 3], 14, 0xF4D50D87);
      b = gg(b, c, d, a, x[i+ 8], 20, 0x455A14ED);
      a = gg(a, b, c, d, x[i+13], 5 , 0xA9E3E905);
      d = gg(d, a, b, c, x[i+ 2], 9 , 0xFCEFA3F8);
      c = gg(c, d, a, b, x[i+ 7], 14, 0x676F02D9);
      b = gg(b, c, d, a, x[i+12], 20, 0x8D2A4C8A);
 
      a = hh(a, b, c, d, x[i+ 5], 4 , 0xFFFA3942);
      d = hh(d, a, b, c, x[i+ 8], 11, 0x8771F681);
      c = hh(c, d, a, b, x[i+11], 16, 0x6D9D6122);
      b = hh(b, c, d, a, x[i+14], 23, 0xFDE5380C);
      a = hh(a, b, c, d, x[i+ 1], 4 , 0xA4BEEA44);
      d = hh(d, a, b, c, x[i+ 4], 11, 0x4BDECFA9);
      c = hh(c, d, a, b, x[i+ 7], 16, 0xF6BB4B60);
      b = hh(b, c, d, a, x[i+10], 23, 0xBEBFBC70);
      a = hh(a, b, c, d, x[i+13], 4 , 0x289B7EC6);
      d = hh(d, a, b, c, x[i+ 0], 11, 0xEAA127FA);
      c = hh(c, d, a, b, x[i+ 3], 16, 0xD4EF3085);
      b = hh(b, c, d, a, x[i+ 6], 23, 0x04881D05);
      a = hh(a, b, c, d, x[i+ 9], 4 , 0xD9D4D039);
      d = hh(d, a, b, c, x[i+12], 11, 0xE6DB99E5);
      c = hh(c, d, a, b, x[i+15], 16, 0x1FA27CF8);
      b = hh(b, c, d, a, x[i+ 2], 23, 0xC4AC5665);
 
      a = ii(a, b, c, d, x[i+ 0], 6 , 0xF4292244);
      d = ii(d, a, b, c, x[i+ 7], 10, 0x432AFF97);
      c = ii(c, d, a, b, x[i+14], 15, 0xAB9423A7);
      b = ii(b, c, d, a, x[i+ 5], 21, 0xFC93A039);
      a = ii(a, b, c, d, x[i+12], 6 , 0x655B59C3);
      d = ii(d, a, b, c, x[i+ 3], 10, 0x8F0CCC92);
      c = ii(c, d, a, b, x[i+10], 15, 0xFFEFF47D);
      b = ii(b, c, d, a, x[i+ 1], 21, 0x85845DD1);
      a = ii(a, b, c, d, x[i+ 8], 6 , 0x6FA87E4F);
      d = ii(d, a, b, c, x[i+15], 10, 0xFE2CE6E0);
      c = ii(c, d, a, b, x[i+ 6], 15, 0xA3014314);
      b = ii(b, c, d, a, x[i+13], 21, 0x4E0811A1);
      a = ii(a, b, c, d, x[i+ 4], 6 , 0xF7537E82);
      d = ii(d, a, b, c, x[i+11], 10, 0xBD3AF235);
      c = ii(c, d, a, b, x[i+ 2], 15, 0x2AD7D2BB);
      b = ii(b, c, d, a, x[i+ 9], 21, 0xEB86D391);
 
      a = add(a, olda);
      b = add(b, oldb);
      c = add(c, oldc);
      d = add(d, oldd);
    }
    return rhex(a) + rhex(b) + rhex(c) + rhex(d);
  }

}


上面是算法的实现代码,不过我们真正用的时候当然不需要那么复杂了,jdk里面早就有了高效的算法实现:

package myreuse.common.util;

import sun.misc.BASE64Encoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public abstract class MessageDigester
{
  static MessageDigest SHA1 ;
  static MessageDigest MD5 ;
  static {
    try{
      SHA1 = MessageDigest.getInstance("SHA1");
      MD5 = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e){
      e.printStackTrace();
    }

  }
  public static byte[] SHA1(String msg)
  {
    return SHA1.digest(msg.getBytes());
  }

  public static byte[] MD5(String msg)
  {
    return MD5.digest(msg.getBytes());
  }

  private static BASE64Encoder bASE64Encoder = new BASE64Encoder();

  public static String hex(byte[] b)
  {
    StringBuffer result = new StringBuffer(b.length);
    for (int i = 0; i < b.length; i++)
      result.append(Integer.toHexString(0xff & b[i]));
    return result.toString();
  }

  public static String base64(byte[] b)
  {
    String result = bASE64Encoder.encode(b);
    int i = result.indexOf('=');
    if (i>-1) result = result.substring(0,i);
    return result;
  }

  public static String base64SHA1(String msg)
  {
    return base64(SHA1(msg));
  }

  public static String base64MD5(String msg)
  {
    return base64(MD5(msg));
  }

  public static String hexSHA1(String msg)
  {
    return hex(SHA1(msg));
  }

  public static String hexMD5(String msg)
  {
    return hex(MD5(msg));
  }

}

posted on 2005-05-18 16:16 emu 阅读(1620) 评论(2)  编辑  收藏 所属分类: java技术

评论

# re: java版的sha-1 和 MD5 2009-05-16 23:14 眉山网站建设
天文啊,看不懂啊...  回复  更多评论
  

# Sozdanie I Prodvijenie Saitov 2009-05-18 03:18 Sozdanie I Prodvijenie Saitov
Hi, you have a nice site, good Luck!.
I am from Herzegovina and also now teach English, please tell me right I wrote the following sentence: "Uk webmaster world offers webmaster resources such as web hosting, web development, site promotion, search engine optimisation seo webmaster discussion.Search engine optimisation by seo pro australia."

Thanks 8-). Jackson.  回复  更多评论
  


只有注册用户登录后才能发表评论。


网站导航: