Class: EsuApi::SHA0

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

Constant Summary collapse

BLOCK_SIZE = 
64

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SHA0

Returns a new instance of SHA0.



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# File 'lib/EsuApi.rb', line 1069

def initialize()
  @state = []
  @constants = []
  @buffer = ""
  @state[0] = 0x67452301
  @state[1] = 0xefcdab89
  @state[2] = 0x98badcfe
  @state[3] = 0x10325476
  @state[4] = 0xc3d2e1f0

  @constants[0] = 0x5a827999
  @constants[1] = 0x6ed9eba1
  @constants[2] = 0x8f1bbcdc
  @constants[3] = 0xca62c1d6

  @counter = 0
end

Instance Attribute Details

#buffer ⇒ Object

Returns the value of attribute buffer.



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# File 'lib/EsuApi.rb', line 1407

def buffer
  @buffer
end

#counter ⇒ Object

Returns the value of attribute counter.



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# File 'lib/EsuApi.rb', line 1407

def counter
  @counter
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/EsuApi.rb', line 1407

def state
  @state
end

Instance Method Details

#clone ⇒ Object

Creates a deep copy of the object. This allows you to get the current hash value at various offsets without disrupting the hash in progress, e.g. sha = EsuApi::SHA0.new() sha.hashUpdate( block1 ) shacopy = sha.clone() partialHash = shacopy.hashFinal(nil) sha.hashUpdate( block2 ) ... 



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# File 'lib/EsuApi.rb', line 1098

def clone()
  copy = EsuApi::SHA0.new()

  copy.state[0] = @state[0]
  copy.state[1] = @state[1]
  copy.state[2] = @state[2]
  copy.state[3] = @state[3]
  copy.state[4] = @state[4]

  copy.counter = @counter

  copy.buffer = @buffer+"" # Clone the string

  return copy
end

#f1(a, b, c) ⇒ Object

Round 1 mix function



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# File 'lib/EsuApi.rb', line 1388

def f1( a, b, c )
  return truncate((c^(a&(b^c))) + @constants[0])
end

#f2(a, b, c) ⇒ Object

Round 2 mix function



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# File 'lib/EsuApi.rb', line 1393

def f2( a, b, c )
  return truncate((a^b^c) + @constants[1])
end

#f3(a, b, c) ⇒ Object

Round 3 mix function



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# File 'lib/EsuApi.rb', line 1398

def f3( a, b, c )
  return truncate(((a&b)|(c&(a|b))) + @constants[2])
end

#f4(a, b, c) ⇒ Object

Round 4 mix function



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# File 'lib/EsuApi.rb', line 1403

def f4( a, b, c )
  return truncate((a^b^c) + @constants[3])
end

#hashFinal(data) ⇒ Object 



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# File 'lib/EsuApi.rb', line 1135

def hashFinal( data )
  if( data == nil )
    data = ""
  end

  # Consume up to the last block
  hashUpdate( data )
  @counter += @buffer.length << 3

  # Append the bits 1000 0000
  @buffer += 0x80.chr

  # See if we have enough room to pad out the final block
  if( @buffer.length > SHA0::BLOCK_SIZE-8 )
    while( @buffer.length < SHA0::BLOCK_SIZE )
      @buffer+=0.chr
    end
    internalHashUpdate( @buffer )
    @buffer = ""

    # Write a zero buffer.
    (0..SHA0::BLOCK_SIZE-9).each{ |i|
      @buffer[i] = 0.chr
    }
  end

  # Expand the buffer out to a block size
  while( @buffer.length < SHA0::BLOCK_SIZE-8 )
    @buffer += 0.chr
  end

  # Append the bit count (8 bytes) to buffer
  carr = []
  carr.push( 0 )
  carr.push( @counter )
  @buffer += carr.pack( "N*" )

  # Process the final block
  internalHashUpdate( @buffer )

  #      var output:ByteArray = new ByteArray()
  #      output.writeUnsignedInt( state[0] )
  #      output.writeUnsignedInt( state[1] )
  #      output.writeUnsignedInt( state[2] )
  #      output.writeUnsignedInt( state[3] )
  #      output.writeUnsignedInt( state[4] )
  output = @state.pack( "N*" )

  return output
end

#hashUpdate(data) ⇒ Object 



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# File 'lib/EsuApi.rb', line 1114

def hashUpdate( data )
  # Break up into 64 byte chunks.
  i=0

  while( i<data.length )
    if( data.length - i + @buffer.length >= BLOCK_SIZE )
      usedBytes = SHA0::BLOCK_SIZE-@buffer.length
      @buffer += data.slice( i, usedBytes )

      internalHashUpdate( @buffer )
      @counter += SHA0::BLOCK_SIZE << 3
      @buffer = ""
      i+= usedBytes
    else
      # Save remaining bytes for next chunk
      @buffer += data.slice( i, data.length-i )
      i += data.length-i
    end
  end
end

#internalHashUpdate(data) ⇒ Object 



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# File 'lib/EsuApi.rb', line 1186

def internalHashUpdate( data )
  # Expand the buffer into an array of uints
  nblk = data.unpack( "N*" )
  
  # Expand into an array of 80 uints
  (16..79).each{ |i|
    nblk[i] = nblk[i-3] ^ nblk[i-8] ^ nblk[i-14] ^ nblk[i-16]
  }
  
  # Do the rounds
  a = truncate(@state[0])
  b = truncate(@state[1])
  c = truncate(@state[2])
  d = truncate(@state[3])
  e = truncate(@state[4])

  e = truncadd( e, rol( a, 5 ) + f1(b, c, d) + nblk[0] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f1(a, b, c) + nblk[1] )
  a =rol( a, 30 )
  c = c = truncadd( c, rol( d, 5 ) + f1(e, a, b) + nblk[2] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f1(d, e, a) + nblk[3] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f1(c, d, e) + nblk[4] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f1(b, c, d) + nblk[5] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f1(a, b, c) + nblk[6] )
  a =rol( a, 30 )
  c = c = truncadd( c, rol( d, 5 ) + f1(e, a, b) + nblk[7] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f1(d, e, a) + nblk[8] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f1(c, d, e) + nblk[9] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f1(b, c, d) + nblk[10] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f1(a, b, c) + nblk[11] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f1(e, a, b) + nblk[12] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f1(d, e, a) + nblk[13] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f1(c, d, e) + nblk[14] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f1(b, c, d) + nblk[15] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f1(a, b, c) + nblk[16] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f1(e, a, b) + nblk[17] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f1(d, e, a) + nblk[18] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f1(c, d, e) + nblk[19] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f2(b, c, d) + nblk[20] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f2(a, b, c) + nblk[21] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f2(e, a, b) + nblk[22] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f2(d, e, a) + nblk[23] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f2(c, d, e) + nblk[24] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f2(b, c, d) + nblk[25] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f2(a, b, c) + nblk[26] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f2(e, a, b) + nblk[27] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f2(d, e, a) + nblk[28] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f2(c, d, e) + nblk[29] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f2(b, c, d) + nblk[30] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f2(a, b, c) + nblk[31] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f2(e, a, b) + nblk[32] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f2(d, e, a) + nblk[33] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f2(c, d, e) + nblk[34] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f2(b, c, d) + nblk[35] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f2(a, b, c) + nblk[36] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f2(e, a, b) + nblk[37] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f2(d, e, a) + nblk[38] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f2(c, d, e) + nblk[39] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f3(b, c, d) + nblk[40] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f3(a, b, c) + nblk[41] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f3(e, a, b) + nblk[42] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f3(d, e, a) + nblk[43] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f3(c, d, e) + nblk[44] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f3(b, c, d) + nblk[45] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f3(a, b, c) + nblk[46] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f3(e, a, b) + nblk[47] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f3(d, e, a) + nblk[48] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f3(c, d, e) + nblk[49] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f3(b, c, d) + nblk[50] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f3(a, b, c) + nblk[51] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f3(e, a, b) + nblk[52] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f3(d, e, a) + nblk[53] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f3(c, d, e) + nblk[54] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f3(b, c, d) + nblk[55] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f3(a, b, c) + nblk[56] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f3(e, a, b) + nblk[57] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f3(d, e, a) + nblk[58] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f3(c, d, e) + nblk[59] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f4(b, c, d) + nblk[60] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f4(a, b, c) + nblk[61] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f4(e, a, b) + nblk[62] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f4(d, e, a) + nblk[63] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f4(c, d, e) + nblk[64] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f4(b, c, d) + nblk[65] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f4(a, b, c) + nblk[66] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f4(e, a, b) + nblk[67] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f4(d, e, a) + nblk[68] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f4(c, d, e) + nblk[69] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f4(b, c, d) + nblk[70] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f4(a, b, c) + nblk[71] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f4(e, a, b) + nblk[72] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f4(d, e, a) + nblk[73] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f4(c, d, e) + nblk[74] )
  c =rol( c, 30 )
  e = truncadd( e, rol( a, 5 ) + f4(b, c, d) + nblk[75] )
  b =rol( b, 30 )
  d = d = truncadd( d, rol( e, 5 ) + f4(a, b, c) + nblk[76] )
  a =rol( a, 30 )
  c = truncadd( c, rol( d, 5 ) + f4(e, a, b) + nblk[77] )
  e =rol( e, 30 )
  b = truncadd( b, rol( c, 5 ) + f4(d, e, a) + nblk[78] )
  d =rol( d, 30 )
  a = truncadd( a, rol( b, 5 ) + f4(c, d, e) + nblk[79] )
  c =rol( c, 30 )

  # Update state
  @state[0] = truncate( a + @state[0] )
  @state[1] = truncate( b + @state[1] )
  @state[2] = truncate( c + @state[2] )
  @state[3] = truncate( d + @state[3] )
  @state[4] = truncate( e + @state[4] )
  
end

#rol(val, steps) ⇒ Object

Roll left; truncate to 32 bits.



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# File 'lib/EsuApi.rb', line 1373

def rol( val, steps )
  return truncate( val << steps )|truncate( val >> 32-steps )
end

#truncadd(v1, v2, v3 = 0, v4 = 0) ⇒ Object

Truncate-and-add function



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# File 'lib/EsuApi.rb', line 1383

def truncadd( v1, v2, v3=0, v4=0 )
  return truncate( v1+v2+v3+v4 )
end

#truncate(val) ⇒ Object

Truncates to 32 bits to prevent Fixnum from becoming Bignum



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# File 'lib/EsuApi.rb', line 1378

def truncate( val )
  return val & 0xffffffff
end