Sha256: 95a4f78292eeacbbc84786af170f78433d1483c353ec2627d5595b169bc7fce2
Contents?: true
Size: 1.37 KB
Versions: 22
Compression:
Stored size: 1.37 KB
Contents
module Stellar
module Util
require 'base32'
require 'digest/crc16_xmodem'
class StrKey
VERSION_BYTES = {
account_id: [ 6 << 3].pack("C"), # Base32-encodes to 'G...'
seed: [18 << 3].pack("C"), # Base32-encodes to 'S...'
}
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
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
# return the "XModem CRC16" (CCITT-like, but with 0-init and MSB first)
# packed into a string in little-endian order
def self.checksum(bytes)
crc = Digest::CRC16XModem.checksum(bytes)
[crc].pack("S<")
end
end
end
end
Version data entries
22 entries across 22 versions & 3 rubygems