Class: Absmartly::Md5

Inherits:
Object
  • Object
show all
Defined in:
lib/absmartly/md5.rb

Class Method Summary collapse

Class Method Details

.cmn(q, a, b, x, s, t) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 7

def self.cmn (q, a, b, x, s, t)
  a = a + q + (x >> 0) + t # TODO >>>
  ((a << s) | (a >> (32 - s))) + b # TODO >>>
end

.ff(a, b, c, d, x, s, t) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 12

def self.ff(a, b, c, d, x, s, t)
  cmn((b & c) | (~b & d), a, b, x, s, t)
end

.gg(a, b, c, d, x, s, t) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 16

def self.gg(a, b, c, d, x, s, t)
  cmn((b & d) | (c & ~d), a, b, x, s, t)
end

.hh(a, b, c, d, x, s, t) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 20

def self.hh(a, b, c, d, x, s, t)
  cmn(b ^ c ^ d, a, b, x, s, t)
end

.ii(a, b, c, d, x, s, t) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 24

def self.ii(a, b, c, d, x, s, t)
  cmn(c ^ (b | ~d), a, b, x, s, t)
end

.md5_cycle(x, k) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 28

def self.md5_cycle(x, k)
  a = x[0]
  b = x[1]
  c = x[2]
  d = x[3]

  a = ff(a, b, c, d, k[0], 7, -680876936)
  d = ff(d, a, b, c, k[1], 12, -389564586)
  c = ff(c, d, a, b, k[2], 17, 606105819)
  b = ff(b, c, d, a, k[3], 22, -1044525330)
  a = ff(a, b, c, d, k[4], 7, -176418897)
  d = ff(d, a, b, c, k[5], 12, 1200080426)
  c = ff(c, d, a, b, k[6], 17, -1473231341)
  b = ff(b, c, d, a, k[7], 22, -45705983)
  a = ff(a, b, c, d, k[8], 7, 1770035416)
  d = ff(d, a, b, c, k[9], 12, -1958414417)
  c = ff(c, d, a, b, k[10], 17, -42063)
  b = ff(b, c, d, a, k[11], 22, -1990404162)
  a = ff(a, b, c, d, k[12], 7, 1804603682)
  d = ff(d, a, b, c, k[13], 12, -40341101)
  c = ff(c, d, a, b, k[14], 17, -1502002290)
  b = ff(b, c, d, a, k[15], 22, 1236535329)

  a = gg(a, b, c, d, k[1], 5, -165796510)
  d = gg(d, a, b, c, k[6], 9, -1069501632)
  c = gg(c, d, a, b, k[11], 14, 643717713)
  b = gg(b, c, d, a, k[0], 20, -373897302)
  a = gg(a, b, c, d, k[5], 5, -701558691)
  d = gg(d, a, b, c, k[10], 9, 38016083)
  c = gg(c, d, a, b, k[15], 14, -660478335)
  b = gg(b, c, d, a, k[4], 20, -405537848)
  a = gg(a, b, c, d, k[9], 5, 568446438)
  d = gg(d, a, b, c, k[14], 9, -1019803690)
  c = gg(c, d, a, b, k[3], 14, -187363961)
  b = gg(b, c, d, a, k[8], 20, 1163531501)
  a = gg(a, b, c, d, k[13], 5, -1444681467)
  d = gg(d, a, b, c, k[2], 9, -51403784)
  c = gg(c, d, a, b, k[7], 14, 1735328473)
  b = gg(b, c, d, a, k[12], 20, -1926607734)

  a = hh(a, b, c, d, k[5], 4, -378558)
  d = hh(d, a, b, c, k[8], 11, -2022574463)
  c = hh(c, d, a, b, k[11], 16, 1839030562)
  b = hh(b, c, d, a, k[14], 23, -35309556)
  a = hh(a, b, c, d, k[1], 4, -1530992060)
  d = hh(d, a, b, c, k[4], 11, 1272893353)
  c = hh(c, d, a, b, k[7], 16, -155497632)
  b = hh(b, c, d, a, k[10], 23, -1094730640)
  a = hh(a, b, c, d, k[13], 4, 681279174)
  d = hh(d, a, b, c, k[0], 11, -358537222)
  c = hh(c, d, a, b, k[3], 16, -722521979)
  b = hh(b, c, d, a, k[6], 23, 76029189)
  a = hh(a, b, c, d, k[9], 4, -640364487)
  d = hh(d, a, b, c, k[12], 11, -421815835)
  c = hh(c, d, a, b, k[15], 16, 530742520)
  b = hh(b, c, d, a, k[2], 23, -995338651)

  a = ii(a, b, c, d, k[0], 6, -198630844)
  d = ii(d, a, b, c, k[7], 10, 1126891415)
  c = ii(c, d, a, b, k[14], 15, -1416354905)
  b = ii(b, c, d, a, k[5], 21, -57434055)
  a = ii(a, b, c, d, k[12], 6, 1700485571)
  d = ii(d, a, b, c, k[3], 10, -1894986606)
  c = ii(c, d, a, b, k[10], 15, -1051523)
  b = ii(b, c, d, a, k[1], 21, -2054922799)
  a = ii(a, b, c, d, k[8], 6, 1873313359)
  d = ii(d, a, b, c, k[15], 10, -30611744)
  c = ii(c, d, a, b, k[6], 15, -1560198380)
  b = ii(b, c, d, a, k[13], 21, 1309151649)
  a = ii(a, b, c, d, k[4], 6, -145523070)
  d = ii(d, a, b, c, k[11], 10, -1120210379)
  c = ii(c, d, a, b, k[2], 15, 718787259)
  b = ii(b, c, d, a, k[9], 21, -343485551)

  x[0] = (a + x[0]) >> 0 # TODO >>>
  x[1] = (b + x[1]) >> 0 # TODO >>>
  x[2] = (c + x[2]) >> 0 # TODO >>>
  x[3] = (d + x[3]) >> 0 # TODO >>>
end

.process(new_bytes_buffer) ⇒ Object 



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# File 'lib/absmartly/md5.rb', line 108

def self.process(new_bytes_buffer)
  key = DataView.new new_bytes_buffer, 0, new_bytes_buffer.length

  l     = new_bytes_buffer.length
  n     = l & ~63
  i     = 0
  block = ArrayBuffer.new(16)
  state = ArrayBuffer.new(4)

  [1732584193, -271733879, -1732584194, 271733878].each_with_index do |el, index|
    state[index] = el
  end

  (0...n).step(64).each do |val|
    (0...16).each do |w|
      block[w] = key.getU32(val + (w << 2))
    end

    md5_cycle(state, block)

    i += 64
  end

  w = 0
  m = l & ~3

  (i...m).step(4).each do |val|
    block[w] = key.getU32(val)
    w        += 1
  end

  p = l & 3

  case p
  when 3
    block[w] = 0x80000000 | key.getU8(i) | (key.getU8(i + 1) << 8) | (key.getU8(i + 2) << 16)
    w        += 1
  when 2
    block[w] = 0x800000 | key.getUint8(i) | (key.getUint8(i + 1) << 8)
    w        += 1

  when 1
    block[w] = 0x8000 | key.getUint8(i)
    w        += 1

  else
    block[w] = 0x80
    w        += 1

  end

  if w > 14
    (w...16).each do |v|
      block[v] = 0
    end

    md5_cycle(state, block)
    w = 0
  end

  (w...16).each do |v|
    block[v] = 0
  end

  block[14] = l << 3
  md5_cycle(state, block)

  state
end