Class: Tapyrus::Mnemonic
- Inherits:
-
Object
- Object
- Tapyrus::Mnemonic
- Defined in:
- lib/tapyrus/mnemonic.rb
Overview
Mnemonic code for generating deterministic keys github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
Constant Summary collapse
- WORD_DIR =
"#{__dir__}/mnemonic/wordlist"
Instance Attribute Summary collapse
-
#word_list ⇒ Object
readonly
Returns the value of attribute word_list.
Class Method Summary collapse
-
.word_lists ⇒ Object
get support language list.
Instance Method Summary collapse
-
#checksum(entropy) ⇒ String
calculate entropy checksum.
-
#initialize(word_list) ⇒ Mnemonic
constructor
A new instance of Mnemonic.
-
#to_entropy(words) ⇒ String
generate entropy from mnemonic word.
-
#to_mnemonic(entropy) ⇒ Array
generate mnemonic words from entropy.
-
#to_seed(mnemonic, passphrase: "") ⇒ String
generate seed from mnemonic if mnemonic protected with passphrase, specify that passphrase.
Constructor Details
#initialize(word_list) ⇒ Mnemonic
Returns a new instance of Mnemonic.
9 10 11 12 |
# File 'lib/tapyrus/mnemonic.rb', line 9 def initialize(word_list) raise ArgumentError, "specified language is not supported." unless Mnemonic.word_lists.include?(word_list) @word_list = word_list end |
Instance Attribute Details
#word_list ⇒ Object (readonly)
Returns the value of attribute word_list.
7 8 9 |
# File 'lib/tapyrus/mnemonic.rb', line 7 def word_list @word_list end |
Class Method Details
Instance Method Details
#checksum(entropy) ⇒ String
calculate entropy checksum
69 70 71 72 |
# File 'lib/tapyrus/mnemonic.rb', line 69 def checksum(entropy) b = Tapyrus.sha256([entropy].pack("B*")).unpack("B*").first b.slice(0, (entropy.length / 32)) end |
#to_entropy(words) ⇒ String
generate entropy from mnemonic word
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
# File 'lib/tapyrus/mnemonic.rb', line 22 def to_entropy(words) word_master = load_words mnemonic = words .map do |w| index = word_master.index(w.downcase) raise IndexError, "word not found in words list." unless index index.to_s(2).rjust(11, "0") end .join entropy = mnemonic.slice(0, (mnemonic.length * 32) / 33) checksum = mnemonic.gsub(entropy, "") raise SecurityError, "checksum mismatch." unless checksum == checksum(entropy) [entropy].pack("B*").bth end |
#to_mnemonic(entropy) ⇒ Array
generate mnemonic words from entropy.
41 42 43 44 45 46 47 48 |
# File 'lib/tapyrus/mnemonic.rb', line 41 def to_mnemonic(entropy) raise ArgumentError, "entropy is empty." if entropy.nil? || entropy.empty? e = entropy.htb.unpack("B*").first seed = e + checksum(e) mnemonic_index = seed.chars.each_slice(11).map { |i| i.join.to_i(2) } word_master = load_words mnemonic_index.map { |i| word_master[i] } end |
#to_seed(mnemonic, passphrase: "") ⇒ String
generate seed from mnemonic if mnemonic protected with passphrase, specify that passphrase.
55 56 57 58 59 60 61 62 63 64 |
# File 'lib/tapyrus/mnemonic.rb', line 55 def to_seed(mnemonic, passphrase: "") to_entropy(mnemonic) OpenSSL::PKCS5.pbkdf2_hmac( mnemonic.join(" ").downcase, "mnemonic" + passphrase, 2048, 64, OpenSSL::Digest::SHA512.new ).bth end |