react-strophe/src/sha1.js

Strophe.js is an XMPP library for JavaScript

/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 * in FIPS PUB 180-1
 * Version 2.1a Copyright Paul Johnston 2000 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for details.
 */
/* Some functions and variables have been stripped for use with Strophe */

/*
 * Calculate the SHA-1 of an array of big-endian words, and a bit length
 */
function core_sha1(x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << (24 - len % 32);
  x[(((len + 64) >> 9) << 4) + 15] = len;

  var w = new Array(80);
  var a = 1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d = 271733878;
  var e = -1009589776;

  var i, j, t, olda, oldb, oldc, oldd, olde;
  for (i = 0; i < x.length; i += 16) {
    olda = a;
    oldb = b;
    oldc = c;
    oldd = d;
    olde = e;

    for (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);
      }
      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 [a, b, c, d, e];
}

/*
 * Perform the appropriate triplet combination function for the current
 * iteration
 */
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;
}

/*
 * Determine the appropriate additive constant for the current iteration
 */
function sha1_kt(t) {
  return t < 20
    ? 1518500249
    : t < 40
      ? 1859775393
      : t < 60
        ? -1894007588
        : -899497514;
}

/*
 * Calculate the HMAC-SHA1 of a key and some data
 */
function core_hmac_sha1(key, data) {
  var bkey = str2binb(key);
  if (bkey.length > 16) {
    bkey = core_sha1(bkey, key.length * 8);
  }

  var ipad = new Array(16),
    opad = new Array(16);
  for (var i = 0; i < 16; i++) {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5c5c5c5c;
  }

  var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * 8);
  return core_sha1(opad.concat(hash), 512 + 160);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
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.
 */
function rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert an 8-bit or 16-bit string to an array of big-endian words
 * In 8-bit function, characters >255 have their hi-byte silently ignored.
 */
function str2binb(str) {
  var bin = [];
  var mask = 255;
  for (var i = 0; i < str.length * 8; i += 8) {
    bin[i >> 5] |= (str.charCodeAt(i / 8) & mask) << (24 - i % 32);
  }
  return bin;
}

/*
 * Convert an array of big-endian words to a string
 */
function binb2str(bin) {
  var str = "";
  var mask = 255;
  for (var i = 0; i < bin.length * 32; i += 8) {
    str += String.fromCharCode((bin[i >> 5] >>> (24 - i % 32)) & mask);
  }
  return str;
}

/*
 * Convert an array of big-endian words to a base-64 string
 */
function binb2b64(binarray) {
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var str = "";
  var triplet, j;
  for (var i = 0; i < binarray.length * 4; i += 3) {
    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 (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;
}

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
module.exports = {
  b64_hmac_sha1: function(key, data) {
    return binb2b64(core_hmac_sha1(key, data));
  },
  b64_sha1: function(s) {
    return binb2b64(core_sha1(str2binb(s), s.length * 8));
  },
  binb2str: binb2str,
  core_hmac_sha1: core_hmac_sha1,
  str_hmac_sha1: function(key, data) {
    return binb2str(core_hmac_sha1(key, data));
  },
  str_sha1: function(s) {
    return binb2str(core_sha1(str2binb(s), s.length * 8));
  }
};