class ROTP::Base32
Constants
- CHARS
Public Class Methods
decode(str)
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# File lib/rotp/base32.rb, line 7 def decode(str) output = [] str.scan(/.{1,8}/).each do |block| char_array = decode_block(block).map{|c| c.chr} output << char_array end output.join end
random_base32(length=16)
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# File lib/rotp/base32.rb, line 16 def random_base32(length=16) b32 = String.new OpenSSL::Random.random_bytes(length).each_byte do |b| b32 << CHARS[b % 32] end b32 end
Private Class Methods
decode_block(block)
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# File lib/rotp/base32.rb, line 26 def decode_block(block) length = block.scan(/[^=]/).length quints = block.each_char.map {|c| decode_quint(c)} bytes = [] bytes[0] = (quints[0] << 3) + (quints[1] ? quints[1] >> 2 : 0) return bytes if length < 3 bytes[1] = ((quints[1] & 3) << 6) + (quints[2] << 1) + (quints[3] ? quints[3] >> 4 : 0) return bytes if length < 4 bytes[2] = ((quints[3] & 15) << 4) + (quints[4] ? quints[4] >> 1 : 0) return bytes if length < 6 bytes[3] = ((quints[4] & 1) << 7) + (quints[5] << 2) + (quints[6] ? quints[6] >> 3 : 0) return bytes if length < 7 bytes[4] = ((quints[6] & 7) << 5) + (quints[7] || 0) bytes end
decode_quint(q)
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# File lib/rotp/base32.rb, line 42 def decode_quint(q) CHARS.index(q.downcase) or raise(Base32Error, "Invalid Base32 Character - '#{q}'") end