Class: Bitcoin::Script

Inherits:
Object
  • Object
show all
Defined in:
lib/coin-op/bit.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#chunks ⇒ Object (readonly)

Returns the value of attribute chunks.



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# File 'lib/coin-op/bit.rb', line 191

def chunks
  @chunks
end

#debug ⇒ Object (readonly)

Returns the value of attribute debug.



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# File 'lib/coin-op/bit.rb', line 191

def debug
  @debug
end

#raw ⇒ Object (readonly)

Returns the value of attribute raw.



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# File 'lib/coin-op/bit.rb', line 191

def raw
  @raw
end

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



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# File 'lib/coin-op/bit.rb', line 191

def stack
  @stack
end

Class Method Details

.compare_big_endian(c1, c2) ⇒ Object

Compares two arrays of bytes



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# File 'lib/coin-op/bit.rb', line 215

def self.compare_big_endian(c1, c2)
  c1, c2 = c1.dup, c2.dup # Clone the arrays

  while c1.size > c2.size
    return 1 if c1.shift > 0
  end

  while c2.size > c1.size
    return -1 if c2.shift > 0
  end

  c1.size.times{|idx| return c1[idx] - c2[idx] if c1[idx] != c2[idx] }
  0
end

.is_low_der_signature?(sig) ⇒ Boolean

Loosely correlates with IsLowDERSignature() from interpreter.cpp

Returns:

  • (Boolean) 


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# File 'lib/coin-op/bit.rb', line 194

def self.is_low_der_signature?(sig)
  s = sig.unpack("C*")

  length_r = s[3]
  length_s = s[5+length_r]
  s_val = s.slice(6 + length_r, length_s)

  # If the S value is above the order of the curve divided by two, its
  # complement modulo the order could have been used instead, which is
  # one byte shorter when encoded correctly.
  max_mod_half_order = [
    0x7f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
    0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
    0x5d,0x57,0x6e,0x73,0x57,0xa4,0x50,0x1d,
    0xdf,0xe9,0x2f,0x46,0x68,0x1b,0x20,0xa0]

  compare_big_endian(s_val, [0]) > 0 &&
    compare_big_endian(s_val, max_mod_half_order) <= 0
end