freeCodeCamp Challenge Guide: SHA-256

SHA-256


Solutions

Solution 1 (Click to Show/Hide)
function SHA256(input) {
  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 Sigma0512(x) {
    return S(x, 28) ^ S(x, 34) ^ S(x, 39);
  }

  function Sigma1512(x) {
    return S(x, 14) ^ S(x, 18) ^ S(x, 41);
  }

  function Gamma0512(x) {
    return S(x, 1) ^ S(x, 8) ^ R(x, 7);
  }

  function Gamma1512(x) {
    return S(x, 19) ^ S(x, 61) ^ R(x, 6);
  }

  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 core_sha512(m, l) {
    var K = new Array(
      0x428a2f98d728ae22,
      0x7137449123ef65cd,
      0xb5c0fbcfec4d3b2f,
      0xe9b5dba58189dbbc,
      0x3956c25bf348b538,
      0x59f111f1b605d019,
      0x923f82a4af194f9b,
      0xab1c5ed5da6d8118,
      0xd807aa98a3030242,
      0x12835b0145706fbe,
      0x243185be4ee4b28c,
      0x550c7dc3d5ffb4e2,
      0x72be5d74f27b896f,
      0x80deb1fe3b1696b1,
      0x9bdc06a725c71235,
      0xc19bf174cf692694,
      0xe49b69c19ef14ad2,
      0xefbe4786384f25e3,
      0x0fc19dc68b8cd5b5,
      0x240ca1cc77ac9c65,
      0x2de92c6f592b0275,
      0x4a7484aa6ea6e483,
      0x5cb0a9dcbd41fbd4,
      0x76f988da831153b5,
      0x983e5152ee66dfab,
      0xa831c66d2db43210,
      0xb00327c898fb213f,
      0xbf597fc7beef0ee4,
      0xc6e00bf33da88fc2,
      0xd5a79147930aa725,
      0x06ca6351e003826f,
      0x142929670a0e6e70,
      0x27b70a8546d22ffc,
      0x2e1b21385c26c926,
      0x4d2c6dfc5ac42aed,
      0x53380d139d95b3df,
      0x650a73548baf63de,
      0x766a0abb3c77b2a8,
      0x81c2c92e47edaee6,
      0x92722c851482353b,
      0xa2bfe8a14cf10364,
      0xa81a664bbc423001,
      0xc24b8b70d0f89791,
      0xc76c51a30654be30,
      0xd192e819d6ef5218,
      0xd69906245565a910,
      0xf40e35855771202a,
      0x106aa07032bbd1b8,
      0x19a4c116b8d2d0c8,
      0x1e376c085141ab53,
      0x2748774cdf8eeb99,
      0x34b0bcb5e19b48a8,
      0x391c0cb3c5c95a63,
      0x4ed8aa4ae3418acb,
      0x5b9cca4f7763e373,
      0x682e6ff3d6b2b8a3,
      0x748f82ee5defb2fc,
      0x78a5636f43172f60,
      0x84c87814a1f0ab72,
      0x8cc702081a6439ec,
      0x90befffa23631e28,
      0xa4506cebde82bde9,
      0xbef9a3f7b2c67915,
      0xc67178f2e372532b,
      0xca273eceea26619c,
      0xd186b8c721c0c207,
      0xeada7dd6cde0eb1e,
      0xf57d4f7fee6ed178,
      0x06f067aa72176fba,
      0x0a637dc5a2c898a6,
      0x113f9804bef90dae,
      0x1b710b35131c471b,
      0x28db77f523047d84,
      0x32caab7b40c72493,
      0x3c9ebe0a15c9bebc,
      0x431d67c49c100d4c,
      0x4cc5d4becb3e42b6,
      0x597f299cfc657e2a,
      0x5fcb6fab3ad6faec,
      0x6c44198c4a475817
    );
    var HASH = new Array(
      0x6a09e667f3bcc908,
      0xbb67ae8584caa73b,
      0x3c6ef372fe94f82b,
      0xa54ff53a5f1d36f1,
      0x510e527fade682d1,
      0x9b05688c2b3e6c1f,
      0x1f83d9abfb41bd6b,
      0x5be0cd19137e2179
    );
    var W = new Array(80);
    var a, b, c, d, e, f, g, h, i, j;
    var T1, T2;
  }

  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 binb2str(bin) {
    var str = '';
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < bin.length * 32; i += chrsz)
      str += String.fromCharCode((bin[i >> 5] >>> (24 - (i % 32))) & mask);
    return str;
  }

  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;
  }

  function binb2b64(binarray) {
    var tab =
      'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    var str = '';
    for (var i = 0; i < binarray.length * 4; i += 3) {
      var 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 (var j = 0; j < 4; j++) {
        if (i * 8 + j * 6 > binarray.length * 32) str += '';
        else str += tab.charAt((triplet >> (6 * (3 - j))) & 0x3f);
      }
    }
    return str;
  }

  function hex_sha2(s) {
    return binb2hex(core_sha256(str2binb(s), s.length * chrsz));
  }

  function b64_sha2(s) {
    return binb2b64(core_sha256(str2binb(s), s.length * chrsz));
  }

  function str_sha2(s) {
    return binb2str(core_sha256(str2binb(s), s.length * chrsz));
  }
  return hex_sha2(input);
}