1 files changed, 67 insertions, 0 deletions
diff --git a/vendor/base32/lib/base32.rb b/vendor/base32/lib/base32.rb
new file mode 100644
index 0000000..4df2b1a
--- /dev/null
+++ b/vendor/base32/lib/base32.rb
@@ -0,0 +1,67 @@
+require 'openssl'
+
+# Module for encoding and decoding in Base32 per RFC 3548
+module Base32
+  TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'.freeze
+
+  class Chunk
+    def initialize(bytes)
+      @bytes = bytes
+    end
+
+    def decode
+      bytes = @bytes.take_while {|c| c != 61} # strip padding
+      n = (bytes.length * 5.0 / 8.0).floor
+      p = bytes.length < 8 ? 5 - (n * 8) % 5 : 0
+      c = bytes.inject(0) {|m,o| (m << 5) + Base32.table.index(o.chr)} >> p
+      (0..n-1).to_a.reverse.collect {|i| ((c >> i * 8) & 0xff).chr}
+    end
+
+    def encode
+      n = (@bytes.length * 8.0 / 5.0).ceil
+      p = n < 8 ? 5 - (@bytes.length * 8) % 5 : 0
+      c = @bytes.inject(0) {|m,o| (m << 8) + o} << p
+      [(0..n-1).to_a.reverse.collect {|i| Base32.table[(c >> i * 5) & 0x1f].chr},
+       ("=" * (8-n))]
+    end
+  end
+
+  def self.chunks(str, size)
+    result = []
+    bytes = str.bytes
+    while bytes.any? do
+      result << Chunk.new(bytes.take(size))
+      bytes = bytes.drop(size)
+    end
+    result
+  end
+
+  def self.encode(str)
+    chunks(str, 5).collect(&:encode).flatten.join
+  end
+
+  def self.decode(str)
+    chunks(str, 8).collect(&:decode).flatten.join
+  end
+
+  def self.random_base32(length=16, padding=true)
+    random = ''
+    OpenSSL::Random.random_bytes(length).each_byte do |b|
+      random << self.table[b % 32]
+    end
+    padding ? random.ljust((length / 8.0).ceil * 8, '=') : random
+  end
+
+  def self.table=(table)
+    raise ArgumentError, "Table must have 32 unique characters" unless self.table_valid?(table)
+    @table = table
+  end
+
+  def self.table
+    @table || TABLE
+  end
+
+  def self.table_valid?(table)
+    table.bytes.to_a.size == 32 && table.bytes.to_a.uniq.size == 32
+  end
+end