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[Java教程]javascript实现SHA1算法


web里面密码直接传到后台是不安全的,有时候需要进行加密,找到一个不错的javascript SHA1算法:

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>SHA1算法</title></head><body>  <script type="text/javascript">  /*   *   * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined   * in FIPS PUB 180-1   *   * By lizq   *   * 2006-11-11   *   */  /*   *   * Configurable variables.   *   */  var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */  var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */  /*   *   * The main function to calculate message digest   *   */  function hex_sha1(s) {    return binb2hex(core_sha1(AlignSHA1(s)));  }  /*   *   * Perform a simple self-test to see if the VM is working   *   */  function sha1_vm_test() {    return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";  }  /*   *   * Calculate the SHA-1 of an array of big-endian words, and a bit length   *   */  function core_sha1(blockArray) {    var x = blockArray; // append padding    var w = 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) // 每次处理512位 16*32    {      var olda = a;      var oldb = b;      var oldc = c;      var oldd = d;      var olde = e;      for (var j = 0; j < 80; j++) // 对每个512位进行80步操作      {        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), 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);    }    return new Array(a, b, c, d, e);  }  /*   *   * Perform the appropriate triplet combination function for the current   * iteration   *   * 返回对应F函数的值   *   */  function sha1_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; // t<80  }  /*   *   * Determine the appropriate additive constant for the current iteration   *   * 返回对应的Kt值   *   */  function sha1_kt(t) {    return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;  }  /*   *   * Add integers, wrapping at 2^32. This uses 16-bit operations internally   *   * to work around bugs in some JS interpreters.   *   * 将32位数拆成高16位和低16位分别进行相加,从而实现 MOD 2^32 的加法   *   */  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.   *   * 32位二进制数循环左移   *   */  function rol(num, cnt) {    return (num << cnt) | (num >>> (32 - cnt));  }  /*   *   * The standard SHA1 needs the input string to fit into a block   *   * This function align the input string to meet the requirement   *   */  function AlignSHA1(str) {    var nblk = ((str.length + 8) >> 6) + 1,      blks = new Array(nblk * 16);    for (var i = 0; i < nblk * 16; i++)      blks[i] = 0;    for (i = 0; i < str.length; i++)      blks[i >> 2] |= str.charCodeAt(i) << (24 - (i & 3) * 8);    blks[i >> 2] |= 0x80 << (24 - (i & 3) * 8);    blks[nblk * 16 - 1] = str.length * 8;    return blks;  }  /*   *   * Convert an array of big-endian words to a hex string.   *   */  function binb2hex(binarray) {    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";    var str = "";    for (var i = 0; i < binarray.length * 4; i++) {      str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) +        hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF);    }    return str;  }  /*   *   * calculate MessageDigest accord to source message that inputted   *   */  // function calcDigest() {  //   var digestM = hex_sha1(document.SHAForm.SourceMessage.value);  //   document.SHAForm.MessageDigest.value = digestM;  // }</script></body></html>

调用方法hex_sha1(value),如下:

var value="brady03161118";  var sha1_result=hex_sha1(value);  console.log(sha1_result)
加密后的结果是:45bc4a15465c7d6026c42fb43c7a11f2f17f59d6