ckb-ruby-example.rb

ckb-ruby-example.rb

# This contract needs 3 required arguments:
# 0. pubkey hash, double blake2b hash of pubkey, used to shield the real
# pubkey in lock script.
# 1. pubkey, real pubkey used to identify token owner
# 2. signature, signature used to present ownership
if ARGV.length != 3
  raise "Wrong number of arguments!"
end

def hex_to_bin(s)
  if s.start_with?("0x")
    s = s[2..-1]
  end
  [s].pack("H*")
end

pubkey_hash = hex_to_bin(ARGV[0])
pubkey = hex_to_bin(ARGV[1])
hash = Blake2b.new.update(Blake2b.new.update(pubkey).final).final
unless hash == pubkey_hash
  raise "Invalid pubkey!"
end

tx = CKB.load_tx
blake2b = Blake2b.new

tx["inputs"].each_with_index do |input, i|
  blake2b.update(input["hash"])
  blake2b.update(input["index"].to_s)
end
tx["outputs"].each_with_index do |output, i|
  blake2b.update(output["capacity"].to_s)
  blake2b.update(CKB.load_script_hash(i, CKB::Source::OUTPUT, CKB::HashType::LOCK))
  if hash = CKB.load_script_hash(i, CKB::Source::OUTPUT, CKB::HashType::TYPE)
    blake2b.update(hash)
  end
end
hash = blake2b.final
pubkey = ARGV[0]
signature = ARGV[1]

unless Secp256k1.verify(hex_to_bin(pubkey), hex_to_bin(signature), hash)
  raise "Signature verification error!"
end