class Stellar::Util::StrKey

Constants

VERSION_BYTES

Public Class Methods

check_decode(expected_version, str) click to toggle source
# File lib/stellar/util/strkey.rb, line 22
def self.check_decode(expected_version, str)
  decoded      = Base32.decode(str) rescue (raise ArgumentError, "Invalid base32 string")
  version_byte = decoded[0]
  payload      = decoded[1...-2]
  check        = decoded[-2..-1]
  version      = VERSION_BYTES.key(version_byte)

  raise ArgumentError, "Unexpected version: #{version.inspect}" if version != expected_version
  raise ArgumentError, "Invalid checksum" if check != checksum(decoded[0...-2])
  payload
end
check_encode(version, byte_str) click to toggle source
# File lib/stellar/util/strkey.rb, line 14
def self.check_encode(version, byte_str)
  version_byte = VERSION_BYTES[version]
  raise ArgumentError, "Invalid version: #{version}" if version_byte.blank?
  payload = version_byte + byte_str.dup.force_encoding("BINARY")
  check   = checksum(payload)
  Base32.encode(payload + check)
end
checksum(bytes) click to toggle source

return the “XModem CRC16” (CCITT-like, but with 0-init and MSB first) packed into a string in little-endian order

# File lib/stellar/util/strkey.rb, line 36
def self.checksum(bytes)
  crc = Digest::CRC16XModem.checksum(bytes)
  [crc].pack("S<")
end