A complete example of SHA-256 encryption algorithm implemented by Javascript, javascriptsha-256

A complete example of SHA-256 encryption algorithm implemented by Javascript, javascriptsha-256

The example of this article describes the Javascript implementation of the SHA-256 algorithm. We will share this with you for your reference. The details are as follows:

/**** Secure Hash Algorithm (SHA256)* http://www.webtoolkit.info/** Original code by Angel Marin, Paul Johnston.***/function SHA256(s){  var chrsz = 8;  var hexcase = 0;  function safe_add (x, y) {    var lsw = (x & 0xFFFF) + (y & 0xFFFF);    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);    return (msw << 16) | (lsw & 0xFFFF);  }  function S (X, n) { return ( X >>> n ) | (X << (32 - n)); }  function R (X, n) { return ( X >>> n ); }  function Ch(x, y, z) { return ((x & y) ^ ((~x) & z)); }  function Maj(x, y, z) { return ((x & y) ^ (x & z) ^ (y & z)); }  function Sigma0256(x) { return (S(x, 2) ^ S(x, 13) ^ S(x, 22)); }  function Sigma1256(x) { return (S(x, 6) ^ S(x, 11) ^ S(x, 25)); }  function Gamma0256(x) { return (S(x, 7) ^ S(x, 18) ^ R(x, 3)); }  function Gamma1256(x) { return (S(x, 17) ^ S(x, 19) ^ R(x, 10)); }  function core_sha256 (m, l) {    var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 0x14292967, 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13, 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85, 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3, 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070, 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5, 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3, 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208, 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2);    var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);    var W = new Array(64);    var a, b, c, d, e, f, g, h, i, j;    var T1, T2;    m[l >> 5] |= 0x80 << (24 - l % 32);    m[((l + 64 >> 9) << 4) + 15] = l;    for ( var i = 0; i<m.length; i+=16 ) {      a = HASH[0];      b = HASH[1];      c = HASH[2];      d = HASH[3];      e = HASH[4];      f = HASH[5];      g = HASH[6];      h = HASH[7];      for ( var j = 0; j<64; j++) {        if (j < 16) W[j] = m[j + i];        else W[j] = safe_add(safe_add(safe_add(Gamma1256(W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);        T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);        T2 = safe_add(Sigma0256(a), Maj(a, b, c));        h = g;        g = f;        f = e;        e = safe_add(d, T1);        d = c;        c = b;        b = a;        a = safe_add(T1, T2);      }      HASH[0] = safe_add(a, HASH[0]);      HASH[1] = safe_add(b, HASH[1]);      HASH[2] = safe_add(c, HASH[2]);      HASH[3] = safe_add(d, HASH[3]);      HASH[4] = safe_add(e, HASH[4]);      HASH[5] = safe_add(f, HASH[5]);      HASH[6] = safe_add(g, HASH[6]);      HASH[7] = safe_add(h, HASH[7]);    }    return HASH;  }  function str2binb (str) {    var bin = Array();    var mask = (1 << chrsz) - 1;    for(var i = 0; i < str.length * chrsz; i += chrsz) {      bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i%32);    }    return bin;  }  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;  }  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;  }  s = Utf8Encode(s);  return binb2hex(core_sha256(str2binb(s), s.length * chrsz));}