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/* A JavaScript implementation of RIPEMD-160, as specified at
 *
 *   http://www.esat.kuleuven.ac.be/~cosicart/pdf/AB-9601/
 *
 * This is pretty much a straight translation of the pseudocode, which is
 * shorter than the reference version which has loops unrolled, but is
 * also somewhat slower.
 *
 * More information about RIPEMD-160 can be found at
 *
 *   http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
 *
 * Copyright (c) 2004, Jeremy Lin. Written 2004/02/29.
 *
 * You may use this code under the terms of the BSD-style jsotp license:
 *
 *   http://www.ocf.berkeley.edu/~jjlin/jsotp/license.html
 *
 * The utility functions and general framework are borrowed from Paul Johnston's
 * MD4/MD5/SHA-1 JavaScript implementations (http://pajhome.org.uk/crypt/md5), so
 *
 * Portions copyright (c) 1999-2002, Paul Johnston.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_rmd160(s){return binl2hex(core_rmd160(str2binl(s),s.length * chrsz));}
function b64_rmd160(s){return binl2b64(core_rmd160(str2binl(s),s.length * chrsz));}
function str_rmd160(s){return binl2str(core_rmd160(str2binl(s),s.length * chrsz));}
function hex_hmac_rmd160(key, data){ return binl2hex(core_hmac_rmd160(key, data));}
function b64_hmac_rmd160(key, data){ return binl2b64(core_hmac_rmd160(key, data));}
function str_hmac_rmd160(key, data){ return binl2str(core_hmac_rmd160(key, data));}

/*
 * Perform a simple self-test to see if the VM is working
 */
function rmd160_vm_test()
{
  return hex_rmd160("abc") == "8eb208f7e05d987a9b044a8e98c6b087f15a0bfc";
}

/*
 * Calculate the RMD-160 of an array of big-endian words, and a bit length
 */
function core_rmd160(x, len)
{
  /* append padding */
  x[len >> 5] |= 0x80 << (len % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var h0 = 0x67452301;
  var h1 = 0xefcdab89;
  var h2 = 0x98badcfe;
  var h3 = 0x10325476;
  var h4 = 0xc3d2e1f0;

  for (var i = 0; i < x.length; i += 16) {
    var T;
    var A1 = h0, B1 = h1, C1 = h2, D1 = h3, E1 = h4;
    var A2 = h0, B2 = h1, C2 = h2, D2 = h3, E2 = h4;
    for (var j = 0; j <= 79; ++j) {
      T = safe_add(A1, rmd160_f(j, B1, C1, D1));
      T = safe_add(T, x[i + rmd160_r1[j]]);
      T = safe_add(T, rmd160_K1(j));
      T = safe_add(rol(T, rmd160_s1[j]), E1);
      A1 = E1; E1 = D1; D1 = rol(C1, 10); C1 = B1; B1 = T;
      T = safe_add(A2, rmd160_f(79-j, B2, C2, D2));
      T = safe_add(T, x[i + rmd160_r2[j]]);
      T = safe_add(T, rmd160_K2(j));
      T = safe_add(rol(T, rmd160_s2[j]), E2);
      A2 = E2; E2 = D2; D2 = rol(C2, 10); C2 = B2; B2 = T;
    }
    T = safe_add(h1, safe_add(C1, D2));
    h1 = safe_add(h2, safe_add(D1, E2));
    h2 = safe_add(h3, safe_add(E1, A2));
    h3 = safe_add(h4, safe_add(A1, B2));
    h4 = safe_add(h0, safe_add(B1, C2));
    h0 = T;
  }
  return [h0, h1, h2, h3, h4];
}

function rmd160_f(j, x, y, z)
{
  return ( 0 <= j && j <= 15) ? (x ^ y ^ z) :
         (16 <= j && j <= 31) ? (x & y) | (~x & z) :
         (32 <= j && j <= 47) ? (x | ~y) ^ z :
         (48 <= j && j <= 63) ? (x & z) | (y & ~z) :
         (64 <= j && j <= 79) ? x ^ (y | ~z) :
         "rmd160_f: j out of range";
}

function rmd160_K1(j)
{
  return ( 0 <= j && j <= 15) ? 0x00000000 :
         (16 <= j && j <= 31) ? 0x5a827999 :
         (32 <= j && j <= 47) ? 0x6ed9eba1 :
         (48 <= j && j <= 63) ? 0x8f1bbcdc :
         (64 <= j && j <= 79) ? 0xa953fd4e :
         "rmd160_K1: j out of range";
}

function rmd160_K2(j)
{
  return ( 0 <= j && j <= 15) ? 0x50a28be6 :
         (16 <= j && j <= 31) ? 0x5c4dd124 :
         (32 <= j && j <= 47) ? 0x6d703ef3 :
         (48 <= j && j <= 63) ? 0x7a6d76e9 :
         (64 <= j && j <= 79) ? 0x00000000 :
         "rmd160_K2: j out of range";
}

var rmd160_r1 = [
   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
   7,  4, 13,  1, 10,  6, 15,  3, 12,  0,  9,  5,  2, 14, 11,  8,
   3, 10, 14,  4,  9, 15,  8,  1,  2,  7,  0,  6, 13, 11,  5, 12,
   1,  9, 11, 10,  0,  8, 12,  4, 13,  3,  7, 15, 14,  5,  6,  2,
   4,  0,  5,  9,  7, 12,  2, 10, 14,  1,  3,  8, 11,  6, 15, 13
];
var rmd160_r2 = [
   5, 14,  7,  0,  9,  2, 11,  4, 13,  6, 15,  8,  1, 10,  3, 12,
   6, 11,  3,  7,  0, 13,  5, 10, 14, 15,  8, 12,  4,  9,  1,  2,
  15,  5,  1,  3,  7, 14,  6,  9, 11,  8, 12,  2, 10,  0,  4, 13,
   8,  6,  4,  1,  3, 11, 15,  0,  5, 12,  2, 13,  9,  7, 10, 14,
  12, 15, 10,  4,  1,  5,  8,  7,  6,  2, 13, 14,  0,  3,  9, 11
];
var rmd160_s1 = [
  11, 14, 15, 12,  5,  8,  7,  9, 11, 13, 14, 15,  6,  7,  9,  8,
   7,  6,  8, 13, 11,  9,  7, 15,  7, 12, 15,  9, 11,  7, 13, 12,
  11, 13,  6,  7, 14,  9, 13, 15, 14,  8, 13,  6,  5, 12,  7,  5,
  11, 12, 14, 15, 14, 15,  9,  8,  9, 14,  5,  6,  8,  6,  5, 12,
   9, 15,  5, 11,  6,  8, 13, 12,  5, 12, 13, 14, 11,  8,  5,  6
];
var rmd160_s2 = [
   8,  9,  9, 11, 13, 15, 15,  5,  7,  7,  8, 11, 14, 14, 12,  6,
   9, 13, 15,  7, 12,  8,  9, 11,  7,  7, 12,  7,  6, 15, 13, 11,
   9,  7, 15, 11,  8,  6,  6, 14, 12, 13,  5, 14, 13, 13,  7,  5,
  15,  5,  8, 11, 14, 14,  6, 14,  6,  9, 12,  9, 12,  5, 15,  8,
   8,  5, 12,  9, 12,  5, 14,  6,  8, 13,  6,  5, 15, 13, 11, 11
];

/*
 * Calculate the HMAC-RMD160 of a key and some data
 */
function core_hmac_rmd160(key, data)
{
  var bkey = str2binl(key);
  if(bkey.length > 16) bkey = core_rmd160(bkey, key.length * chrsz);

  var ipad = Array(16), opad = Array(16);
  for(var i = 0; i < 16; i++) 
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = core_rmd160(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
  return core_rmd160(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 a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(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) << (i%32);
  return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
  var str = "";
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < bin.length * 32; i += chrsz)
    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
  return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(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] >> ((i%4)*8+4)) & 0xF) +
           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
  }
  return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i += 3)
  {
    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
    for(var j = 0; j < 4; j++)
    {
      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
    }
  }
  return str;
}
