Sha256: 9cfc1269f6da4313161b5d4551f392bdf058fe4cfc5ca749d5d963a2e6c8b7b4
Contents?: true
Size: 1.88 KB
Versions: 18
Compression:
Stored size: 1.88 KB
Contents
require 'siphash'
module Bitcoin
module Message
# BIP-152 Compact Block's data format.
# https://github.com/bitcoin/bips/blob/master/bip-0152.mediawiki#HeaderAndShortIDs
class HeaderAndShortIDs
attr_accessor :header
attr_accessor :nonce
attr_accessor :short_ids
attr_accessor :prefilled_txn
attr_accessor :siphash_key
def initialize(header, nonce, short_ids = [], prefilled_txn = [])
@header = header
@nonce = nonce
@short_ids = short_ids
@prefilled_txn = prefilled_txn
@siphash_key = Bitcoin.sha256(header.to_payload << [nonce].pack('q*'))[0...16]
end
def self.parse_from_payload(payload)
buf = StringIO.new(payload)
header = Bitcoin::BlockHeader.parse_from_payload(buf.read(80))
nonce = buf.read(8).unpack('q*').first
short_ids_len = Bitcoin.unpack_var_int_from_io(buf)
short_ids = short_ids_len.times.map do
buf.read(6).reverse.bth.to_i(16)
end
prefilled_txn_len = Bitcoin.unpack_var_int_from_io(buf)
prefilled_txn = prefilled_txn_len.times.map do
PrefilledTx.parse_from_io(buf)
end
self.new(header, nonce, short_ids, prefilled_txn)
end
def to_payload
p = header.to_payload
p << [nonce].pack('q*')
p << Bitcoin.pack_var_int(short_ids.size)
p << short_ids.map{|id|sprintf('%12x', id).htb.reverse}.join
p << Bitcoin.pack_var_int(prefilled_txn.size)
p << prefilled_txn.map(&:to_payload).join
p
end
# calculate short transaction id which specified by BIP-152.
# @param [String] txid a transaction id
# @return [Integer] 6 bytes short transaction id.
def short_id(txid)
hash = SipHash.digest(siphash_key, txid.htb.reverse).to_even_length_hex
[hash].pack('H*')[2...8].bth.to_i(16)
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems