Class: BitcoinAddrgen::Addrgen

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

Class Method Summary collapse

Class Method Details

.addr_from_mpk(mpk, idx) ⇒ Object 



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# File 'lib/bitcoin_addrgen/addrgen.rb', line 271

def self.addr_from_mpk(mpk, idx)
  _p  = gmp_init('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F', 16)
  _r  = gmp_init('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16)
  _b  = gmp_init('0000000000000000000000000000000000000000000000000000000000000007', 16)
  _Gx = gmp_init('79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798', 16)
  _Gy = gmp_init('483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8', 16)
  curve = Curve.new(_p, 0, _b)
  gen = Point.new(curve, _Gx, _Gy, _r)

  # prepare the input values
  x = gmp_init(mpk[0, 64], 16)
  y = gmp_init(mpk[64, 64], 16)
  z = gmp_init(sha256(sha256_raw(idx.to_s + ':0:' + hex_to_bin(mpk))), 16)

  # generate the new public key based off master and sequence points
  pt = Point.add(Point.new(curve, x, y), Point.mul(z, gen))
  keystr = hex_to_bin('04' + gmp_strval(pt.x, 16).rjust(64, '0') + gmp_strval(pt.y, 16).rjust(64, '0'))
  vh160 =  '00' + ripemd160(sha256_raw(keystr))
  addr = vh160 + sha256(sha256_raw(hex_to_bin(vh160)))[0, 8]

  num = gmp_strval(gmp_init(addr, 16), 58)
  num = num.tr('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv', '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz')

  pad = ''
  n = 0
  while addr[n] == '0' and addr[n+1] == '0'
    pad += '1'
    n += 2
  end

  pad + num
end

.hex_to_bin(s) ⇒ Object 



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# File 'lib/bitcoin_addrgen/addrgen.rb', line 255

def self.hex_to_bin(s)
  [s].pack('H*')
end

.ripemd160(data) ⇒ Object 



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# File 'lib/bitcoin_addrgen/addrgen.rb', line 267

def self.ripemd160(data)
  Digest::RMD160.hexdigest(data)
end

.sha256(data) ⇒ Object 



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# File 'lib/bitcoin_addrgen/addrgen.rb', line 263

def self.sha256(data)
  Digest::SHA256.hexdigest(data)
end

.sha256_raw(data) ⇒ Object 



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# File 'lib/bitcoin_addrgen/addrgen.rb', line 259

def self.sha256_raw(data)
  Digest::SHA256.digest(data)
end