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 



296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
 
# File 'lib/bitcoin_addrgen/addrgen.rb', line 296

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

  GMP::collect_clear
  pad + num
end

.hex_to_bin(s) ⇒ Object 



280
281
282
 
# File 'lib/bitcoin_addrgen/addrgen.rb', line 280

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

.ripemd160(data) ⇒ Object 



292
293
294
 
# File 'lib/bitcoin_addrgen/addrgen.rb', line 292

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

.sha256(data) ⇒ Object 



288
289
290
 
# File 'lib/bitcoin_addrgen/addrgen.rb', line 288

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

.sha256_raw(data) ⇒ Object 



284
285
286
 
# File 'lib/bitcoin_addrgen/addrgen.rb', line 284

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