module Tapyrus::Base58

Base58Check encoding en.bitcoin.it/wiki/Base58Check_encoding

Constants

ALPHABET
SIZE

Public Instance Methods

decode(base58_val) click to toggle source

decode base58 string to hex value.

# File lib/tapyrus/base58.rb, line 23
def decode(base58_val)
  int_val = 0
  base58_val
    .reverse
    .split(//)
    .each_with_index do |char, index|
      raise ArgumentError, 'Value passed not a valid Base58 String.' if (char_index = ALPHABET.index(char)).nil?
      int_val += char_index * (SIZE**index)
    end
  s = int_val.to_even_length_hex
  s = '' if s == '00'
  leading_zero_bytes = (base58_val.match(/^([1]+)/) ? $1 : '').size
  s = ('00' * leading_zero_bytes) + s if leading_zero_bytes > 0
  s
end
encode(hex) click to toggle source

encode hex value to base58 string.

# File lib/tapyrus/base58.rb, line 11
def encode(hex)
  leading_zero_bytes = (hex.match(/^([0]+)/) ? $1 : '').size / 2
  int_val = hex.to_i(16)
  base58_val = ''
  while int_val > 0
    int_val, remainder = int_val.divmod(SIZE)
    base58_val = ALPHABET[remainder] + base58_val
  end
  ('1' * leading_zero_bytes) + base58_val
end