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require 'spec_helper'
RSpec.describe ROTP::Base32 do
describe '.random' do
context 'without arguments' do
let(:base32) { ROTP::Base32.random }
it 'is 20 bytes (160 bits) long (resulting in a 32 character base32 code)' do
expect(ROTP::Base32.decode(base32).length).to eq 20
expect(base32.length).to eq 32
end
it 'is base32 charset' do
expect(base32).to match(/\A[A-Z2-7]+\z/)
end
end
context 'with arguments' do
let(:base32) { ROTP::Base32.random 48 }
it 'returns the appropriate byte length code' do
expect(ROTP::Base32.decode(base32).length).to eq 48
end
end
context 'alias to older random_base32' do
let(:base32) { ROTP::Base32.random_base32(36) }
it 'is base32 charset' do
expect(base32.length).to eq 36
expect(ROTP::Base32.decode(base32).length).to eq 22
end
end
end
describe '.decode' do
context 'corrupt input data' do
it 'raises a sane error' do
expect { ROTP::Base32.decode('4BCDEFG234BCDEF1') }.to \
raise_error(ROTP::Base32::Base32Error, "Invalid Base32 Character - '1'")
end
end
context 'valid input data' do
it 'correctly decodes a string' do
expect(ROTP::Base32.decode('2EB7C66WC5TSO').unpack('H*').first).to eq 'd103f17bd6176727'
expect(ROTP::Base32.decode('Y6Y5ZCAC7NABCHSJ').unpack('H*').first).to eq 'c7b1dc8802fb40111e49'
end
it 'correctly decode strings with trailing bits (not a multiple of 8)' do
# Dropbox style 26 characters (26*5==130 bits or 16.25 bytes, but chopped to 128)
# Matches the behavior of Google Authenticator, drops extra 2 empty bits
expect(ROTP::Base32.decode('YVT6Z2XF4BQJNBMTD7M6QBQCEM').unpack('H*').first).to eq 'c567eceae5e0609685931fd9e8060223'
# For completeness, test all the possibilities allowed by Google Authenticator
# Drop the incomplete empty extra 4 bits (28*5==140bits or 17.5 bytes, chopped to 136 bits)
expect(ROTP::Base32.decode('5GGZQB3WN6LD7V3L5HPDYTQUANEQ').unpack('H*').first).to eq 'e98d9807766f963fd76be9de3c4e140349'
end
context 'with padding' do
it 'correctly decodes a string' do
expect(ROTP::Base32.decode('234A===').unpack('H*').first).to eq 'd6f8'
end
end
end
end
describe '.encode' do
context 'encode input data' do
it 'correctly encodes data' do
expect(ROTP::Base32.encode(hex_to_bin('3c204da94294ff82103ee34e96f74b48'))).to eq 'HQQE3KKCST7YEEB64NHJN52LJA'
end
end
end
end
def hex_to_bin(s)
s.scan(/../).map { |x| x.hex }.pack('c*')
end
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