公共代码之密码加解密

在项目中，我们还会让密码使用定义的加密技术，下面就是我们常用的SHA密码加密算法，实例代码如下：

// Decompiled by DJ v3.7.7.81 Copyright 2004 atanas Neshkov  Date: 2007-7-21 11:55:00 AM  // Home Page : http://members.fortunecity.com/neshkov/dj.html  - Check often for new version!  // Decompiler options: packimports(3)   // Source File Name:   SHA1.java    package com.repair.common.util;    public class SHA1  {        public SHA1()      {      }        public static String b64_hmac_sha1(String key,String data)      {          return binb2b64(core_hmac_sha1(key,data));      }        public static String b64_sha1(String s)      {          s = s != null ? s : "";          return binb2b64(core_sha1(str2binb(s),s.length() * 8));      }        private static String binb2b64(int binarray[])      {          String tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";          String str = "";          binarray = strechBinArray(binarray,binarray.length * 4);          for(int i = 0; i < binarray.length * 4; i += 3)          {              int triplet = (binarray[i >> 2] >> 8 * (3 - i % 4) & 0xff) << 16 | (binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4) & 0xff) << 8 | binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4) & 0xff;              for(int j = 0; j < 4; j++)                  if(i * 8 + j * 6 > binarray.length * 32)                      str = str + "=";                  else                      str = str + tab.charAt(triplet >> 6 * (3 - j) & 0x3f);            }            return cleanB64Str(str);      }        private static String binb2hex(int binarray[])      {          String hex_tab = "0123456789abcdef";          String str = "";          for(int i = 0; i < binarray.length * 4; i++)          {              char a = hex_tab.charAt(binarray[i >> 2] >> (3 - i % 4) * 8 + 4 & 0xf);              char b = hex_tab.charAt(binarray[i >> 2] >> (3 - i % 4) * 8 & 0xf);              str = str + (new Character(a)).toString() + (new Character(b)).toString();          }            return str;      }        private static String binb2str(int bin[])      {          String str = "";          int mask = 255;          for(int i = 0; i < bin.length * 32; i += 8)              str = str + (char)(bin[i >> 5] >>> 24 - i % 32 & mask);            return str;      }        @SuppressWarnings("unused")  	private static int bit_rol(int num,int cnt)      {          return num << cnt | num >>> 32 - cnt;      }        private static String cleanB64Str(String str)      {          str = str != null ? str : "";          int len = str.length();          if(len <= 1)              return str;          char trailChar = str.charAt(len - 1);          String trailStr = "";          for(int i = len - 1; i >= 0 && str.charAt(i) == trailChar; i--)              trailStr = trailStr + str.charAt(i);            return str.substring(0,str.indexOf(trailStr));      }        private static int[] complete216(int oldbin[])      {          if(oldbin.length >= 16)              return oldbin;          int newbin[] = new int[16 - oldbin.length];          for(int i = 0; i < newbin.length; i++)              newbin[i] = 0;            return concat(oldbin,newbin);      }        private static int[] concat(int oldbin[],int newbin[])      {          int retval[] = new int[oldbin.length + newbin.length];          for(int i = 0; i < oldbin.length + newbin.length; i++)              if(i < oldbin.length)                  retval[i] = oldbin[i];              else                  retval[i] = newbin[i - oldbin.length];            return retval;      }        private static int[] core_hmac_sha1(String key,String data)      {          key = key != null ? key : "";          data = data != null ? data : "";          int bkey[] = complete216(str2binb(key));          if(bkey.length > 16)              bkey = core_sha1(bkey,key.length() * 8);          int ipad[] = new int[16];          int opad[] = new int[16];          for(int i = 0; i < 16; i++)          {              ipad[i] = 0;              opad[i] = 0;          }            for(int i = 0; i < 16; i++)          {              ipad[i] = bkey[i] ^ 0x36363636;              opad[i] = bkey[i] ^ 0x5c5c5c5c;          }            int hash[] = core_sha1(concat(ipad,str2binb(data)),512 + data.length() * 8);          return core_sha1(concat(opad,hash),672);      }        private static int[] core_sha1(int x[],int len)      {          int size = len >> 5;          x = strechBinArray(x,size);          x[len >> 5] |= 128 << 24 - len % 32;          size = ((len + 64 >> 9) << 4) + 15;          x = strechBinArray(x,size);          x[((len + 64 >> 9) << 4) + 15] = len;          int w[] = new int[80];          int a = 0x67452301;          int b = 0xefcdab89;          int c = 0x98badcfe;          int d = 0x10325476;          int e = 0xc3d2e1f0;          for(int i = 0; i < x.length; i += 16)          {              int olda = a;              int oldb = b;              int oldc = c;              int oldd = d;              int olde = e;              for(int 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);                  int t = safe_add(safe_add(rol(a,5),sha1_ft(j,b,c,d)),safe_add(safe_add(e,w[j]),sha1_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);          }            int retval[] = new int[5];          retval[0] = a;          retval[1] = b;          retval[2] = c;          retval[3] = d;          retval[4] = e;          return retval;      }        @SuppressWarnings("unused")      private static void dotest()      {  		String key = "key";          String data = "king";          //System.out.println("hex_sha1(" + data + ")=" + hex_sha1(data));          //System.out.println("b64_sha1(" + data + ")=" + b64_sha1(data));          //System.out.println("str_sha1(" + data + ")=" + str_sha1(data));          //System.out.println("hex_hmac_sha1(" + key + "," + data + ")=" + hex_hmac_sha1(key,data));          //System.out.println("b64_hmac_sha1(" + key + "," + data + ")=" + b64_hmac_sha1(key,data));          //System.out.println("str_hmac_sha1(" + key + "," + data + ")=" + str_hmac_sha1(key,data));      }        public static String hex_hmac_sha1(String key,String data)      {          return binb2hex(core_hmac_sha1(key,data));      }        public static String hex_sha1(String s)      {          s = s != null ? s : "";          return binb2hex(core_sha1(str2binb(s),s.length() * 8));      }        private static int rol(int num,int cnt)      {          return num << cnt | num >>> 32 - cnt;      }        private static int safe_add(int x,int y)      {          int lsw = (x & 0xffff) + (y & 0xffff);          int msw = (x >> 16) + (y >> 16) + (lsw >> 16);          return msw << 16 | lsw & 0xffff;      }        private static int sha1_ft(int t,int b,int c,int 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;          else              return b ^ c ^ d;      }        private static int sha1_kt(int t)      {          return t >= 20 ? t >= 40 ? t >= 60 ? 0xca62c1d6 : 0x8f1bbcdc : 0x6ed9eba1 : 0x5a827999;      }        @SuppressWarnings("unused")  	private static boolean sha1_vm_test()      {          return hex_sha1("abc").equals("a9993e364706816aba3e25717850c26c9cd0d89d");      }        public static String str_hmac_sha1(String key,String data)      {          return binb2str(core_hmac_sha1(key,data));      }        public static String str_sha1(String s)      {          s = s != null ? s : "";          return binb2str(core_sha1(str2binb(s),s.length() * 8));      }        private static int[] str2binb(String str)      {          str = str != null ? str : "";          int tmp[] = new int[str.length() * 8];          int mask = 255;          for(int i = 0; i < str.length() * 8; i += 8)              tmp[i >> 5] |= (str.charAt(i / 8) & mask) << 24 - i % 32;            int len = 0;          for(int i = 0; i < tmp.length && tmp[i] != 0;)          {              i++;              len++;          }            int bin[] = new int[len];          for(int i = 0; i < len; i++)              bin[i] = tmp[i];            return bin;      }        private static int[] strechBinArray(int oldbin[],int size)      {          int currlen = oldbin.length;          if(currlen >= size + 1)              return oldbin;          int newbin[] = new int[size + 1];          for(int i = 0; i < size; i++)              newbin[i] = 0;            for(int i = 0; i < currlen; i++)              newbin[i] = oldbin[i];            return newbin;      }        public static String encryptWithSHA1(String str)      {          return b64_sha1(str).substring(0,24);          //return b64_sha1(str);      }      

    //测试      public static void main(String args1[])      {      	System.out.println(encryptWithSHA1("coltrip"));      }        @SuppressWarnings("unused")  	private static final boolean hexcase = false;      @SuppressWarnings({ "unused","unused" })  	private static final String b64pad = "=";      @SuppressWarnings("unused")  	private static final int chrsz = 8;  }