Sha256: 7206e51c27d66d041ae5c757e43d52d72f98cc1886ec8f005390bd7ae7076569
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Size: 1.99 KB
Versions: 22
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Stored size: 1.99 KB
Contents
require 'digest'
module Spaceship
module Hashcash
# This App Store Connect hashcash spec was generously donated by...
#
# __ _
# __ _ _ __ _ __ / _|(_) __ _ _ _ _ __ ___ ___
# / _` || '_ \ | '_ \ | |_ | | / _` || | | || '__|/ _ \/ __|
# | (_| || |_) || |_) || _|| || (_| || |_| || | | __/\__ \
# \__,_|| .__/ | .__/ |_| |_| \__, | \__,_||_| \___||___/
# |_| |_| |___/
#
#
# <summary>
# 1:11:20230223170600:4d74fb15eb23f465f1f6fcbf534e5877::6373
# X-APPLE-HC: 1:11:20230223170600:4d74fb15eb23f465f1f6fcbf534e5877::6373
# ^ ^ ^ ^ ^
# | | | | +-- Counter
# | | | +-- Resource
# | | +-- Date YYMMDD[hhmm[ss]]
# | +-- Bits (number of leading zeros)
# +-- Version
#
# We can't use an off-the-shelf Hashcash because Apple's implementation is not quite the same as the spec/convention.
# 1. The spec calls for a nonce called "Rand" to be inserted between the Ext and Counter. They don't do that at all.
# 2. The Counter conventionally encoded as base-64 but Apple just uses the decimal number's string representation.
#
# Iterate from Counter=0 to Counter=N finding an N that makes the SHA1(X-APPLE-HC) lead with Bits leading zero bits
#
#
# We get the "Resource" from the X-Apple-HC-Challenge header and Bits from X-Apple-HC-Bits
#
# </summary>
def self.make(bits:, challenge:)
version = 1
date = Time.now.strftime("%Y%m%d%H%M%S")
counter = 0
loop do
hc = [
version, bits, date, challenge, ":#{counter}"
].join(":")
if Digest::SHA1.digest(hc).unpack1('B*')[0, bits.to_i].to_i == 0
return hc
end
counter += 1
end
end
end
end
Version data entries
22 entries across 22 versions & 4 rubygems