Complete example of JavaScript-implemented SHA-1 encryption algorithm _ javascript tips-js tutorial

This article mainly introduces the SHA-1 encryption algorithm implemented by JavaScript, and analyzes the implementation skills of the SHA-1 encryption algorithm in the form of a complete example, for more information about the SHA-1 encryption algorithm implemented by JavaScript, see the example in this article. We will share this with you for your reference. The details are as follows:

/**** Secure Hash Algorithm (SHA1)* http://www.webtoolkit.info/***/function SHA1 (msg) {  function rotate_left(n,s) {    var t4 = ( n<>>(32-s));    return t4;  };  function lsb_hex(val) {    var str="";    var i;    var vh;    var vl;    for( i=0; i<=6; i+=2 ) {      vh = (val>>>(i*4+4))&0x0f;      vl = (val>>>(i*4))&0x0f;      str += vh.toString(16) + vl.toString(16);    }    return str;  };  function cvt_hex(val) {    var str="";    var i;    var v;    for( i=7; i>=0; i-- ) {      v = (val>>>(i*4))&0x0f;      str += v.toString(16);    }    return str;  };  function Utf8Encode(string) {    string = string.replace(/\r\n/g,"\n");    var utftext = "";    for (var n = 0; n < string.length; n++) {      var c = string.charCodeAt(n);      if (c < 128) {        utftext += String.fromCharCode(c);      }      else if((c > 127) && (c < 2048)) {        utftext += String.fromCharCode((c >> 6) | 192);        utftext += String.fromCharCode((c & 63) | 128);      }      else {        utftext += String.fromCharCode((c >> 12) | 224);        utftext += String.fromCharCode(((c >> 6) & 63) | 128);        utftext += String.fromCharCode((c & 63) | 128);      }    }    return utftext;  };  var blockstart;  var i, j;  var W = new Array(80);  var H0 = 0x67452301;  var H1 = 0xEFCDAB89;  var H2 = 0x98BADCFE;  var H3 = 0x10325476;  var H4 = 0xC3D2E1F0;  var A, B, C, D, E;  var temp;  msg = Utf8Encode(msg);  var msg_len = msg.length;  var word_array = new Array();  for( i=0; i
  
   >>29 );  word_array.push( (msg_len<<3)&0x0ffffffff );  for ( blockstart=0; blockstart