Module: CryptoAddressValidator::Utils::Bch

Included in:
Bch
Defined in:
lib/crypto_address_validator/utils/bch.rb

Constant Summary collapse

CHARSET = 
'qpzry9x8gf2tvdw0s3jn54khce6mua7l'

Class Method Summary collapse

Class Method Details

.b32decode(inputs) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 14

def b32decode(inputs)
  out = []
  return out unless inputs

  inputs.split('').each do |letter|
    out.push(CHARSET.index(letter))
  end
  out
end

.b32encode(inputs) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 70

def b32encode(inputs)
  out = ''
  inputs.each do |char_code|
    out += CHARSET[char_code].to_s
  end
  out
end

.calculate_cash_checksum(payload) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 55

def calculate_cash_checksum(payload)
  poly = polymod(expanded_prefix + payload + [0, 0, 0, 0, 0, 0, 0, 0])
  out = []
  8.times do |i|
    out.push((poly >> 5 * (7 - i)) & 0x1f)
  end
  out
end

.code_list_to_string(code_list) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 10

def code_list_to_string(code_list)
  code_list.map { |i| Array(i).pack('C*') }.flatten.join
end

.convertbits(data, frombits, tobits, pad = true) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 78

def convertbits(data, frombits, tobits, pad = true)
  acc = 0
  bits = 0
  ret = []
  maxv = (1 << tobits) - 1
  max_acc = (1 << (frombits + tobits - 1)) - 1
  data.each do |value|
    return nil if value < 0 || ((value >> frombits) != 0)

    acc = ((acc << frombits) | value) & max_acc
    bits += frombits
    while bits >= tobits
      bits -= tobits
      ret.push((acc >> bits) & maxv)
    end
  end
  if pad
    ret.push((acc << (tobits - bits)) & maxv) if bits != 0
  elsif bits >= frombits || (((acc << (tobits - bits)) & maxv) != 0)
    return nil
  end
  ret
end

.expanded_prefix ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 43

def expanded_prefix
  val = if prefix
          prefix.to_s.split('').map do |i|
            i.ord & 0x1f
          end
        else
          []
        end

  val + [0]
end

.polymod(values) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 24

def polymod(values)
  chk = 1
  generator = [
    [0x01, 0x98f2bc8e61],
    [0x02, 0x79b76d99e2],
    [0x04, 0xf33e5fb3c4],
    [0x08, 0xae2eabe2a8],
    [0x10, 0x1e4f43e470]
  ]
  values.each do |value|
    top = chk >> 35
    chk = ((chk & 0x07ffffffff) << 5) ^ value
    generator.each do |i|
      chk ^= i[1] if (top & i[0]) != 0
    end
  end
  chk ^ 1
end

.verify_cash_checksum(payload) ⇒ Object 



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# File 'lib/crypto_address_validator/utils/bch.rb', line 64

def verify_cash_checksum(payload)
  polymod(expanded_prefix + payload) == 0
rescue TypeError
  raise CryptoAddressValidator::InvalidAddress
end